DNVGL-OS-A301 Human comfort · ISO 10140-2 2010 Acoustics – Laboratory measurements of sound...

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DNV GL AS

OFFSHORE STANDARDS

DNVGL-OS-A301 Edition April 2016

Human comfort

FOREWORD

DNV GL offshore standards contain technical requirements, principles and acceptance criteriarelated to classification of offshore units.

© DNV GL AS April 2016

Any comments may be sent by e-mail to [email protected]

This service document has been prepared based on available knowledge, technology and/or information at the time of issuance of thisdocument. The use of this document by others than DNV GL is at the user's sole risk. DNV GL does not accept any liability or responsibilityfor loss or damages resulting from any use of this document.

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CONTENTS

Changes – current............................................................3

Chapter 1 Introduction..................................................... 8Section 1 General................................................................................................................ 8

1 Introduction......................................................................................................... 8

2 Objective.............................................................................................................. 8

3 Scope................................................................................................................... 8

4 Application........................................................................................................... 8

5 Structure.............................................................................................................. 8

Section 2 References......................................................................................................... 10

1 General...............................................................................................................10

2 Normative references.........................................................................................10

3 Noise.................................................................................................................. 10

4 Vibration............................................................................................................ 10

5 Illumination........................................................................................................11

6 Indoor climate................................................................................................... 12

Section 3 Abbreviations and definitions............................................................................ 13

1 Definition – type of offshore units.....................................................................13

2 Definition – main parameters............................................................................ 13

3 Definitions and characteristics – systems and components............................... 15

4 Abbreviations..................................................................................................... 16

Chapter 2 Technical requirements.................................. 17Section 1 Introduction....................................................................................................... 17

1 Overview............................................................................................................ 17

2 Enforcement of limits.........................................................................................17

Section 2 Noise and acoustics........................................................................................... 18

1 Area noise level limits....................................................................................... 18

1.1 Introduction....................................................................................................18

1.2 Additional area noise level requirements............................................................ 20

1.3 Maximum noise levels......................................................................................20

1.4 Personnel noise exposure................................................................................. 20

2 Building acoustic requirements..........................................................................22

2.1 Airborne sound insulation.................................................................................22

2.2 Impact sound insulation...................................................................................23

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3 Measurements of area noise levels and acoustical properties............................24

3.1 Measurement standards and guidelines..............................................................24

3.2 Test programs.................................................................................................24

3.3 Measurement positions.....................................................................................24

3.4 Amount of test locations.................................................................................. 25

3.5 Measurement requirements.............................................................................. 25

3.6 Reporting....................................................................................................... 25

4 Test conditions...................................................................................................26

4.1 Introduction....................................................................................................26

4.2 Preferred operating condition............................................................................26

4.3 Alternative test procedures and operating condition.............................................26

4.4 Environmental conditions..................................................................................27

4.5 Test areas - State of completion....................................................................... 27

Section 3 Vibration............................................................................................................ 28

1 Vibration limits.................................................................................................. 28

1.1 Objective........................................................................................................28

1.2 Limitations......................................................................................................28

1.3 Pedestal constructions......................................................................................28

2 Measurements of vibrations...............................................................................28

2.1 Measurement standard.....................................................................................29

2.2 Test program.................................................................................................. 29

2.3 Selection of measurement positions...................................................................29

2.4 Number of measurement positions.................................................................... 29

2.5 Measurement - units and equipment................................................................. 30

2.6 Reporting....................................................................................................... 30

3 Test conditions...................................................................................................31

3.1 Introduction....................................................................................................31

3.2 Comments regarding vibration.......................................................................... 31

Section 4 Illumination....................................................................................................... 32

1 Area light limits................................................................................................. 32

1.1 Objective........................................................................................................32

1.2 Limitations......................................................................................................32

1.3 Illumination limits............................................................................................32

1.4 Preliminary analysis.........................................................................................33

1.5 Application of the limits................................................................................... 34

1.6 Task lighting................................................................................................... 34

1.7 Design........................................................................................................... 34

1.8 Areas not covered........................................................................................... 34

1.9 LED lights.......................................................................................................34

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2 Measurements of the lighting............................................................................ 35

2.1 Measurements.................................................................................................35

2.2 Test program, -location and number of measurements.........................................35

2.3 Measurements.................................................................................................36

3 Test conditions...................................................................................................36

3.1 Light measurements........................................................................................ 36

3.2 Stray light...................................................................................................... 36

3.3 Light from adjacent areas................................................................................ 36

Section 5 Indoor climate................................................................................................... 37

1 Requirements for the on board climate............................................................. 37

1.1 Introduction....................................................................................................37

1.2 Classification of spaces on board.......................................................................37

1.3 Limit values....................................................................................................38

1.4 Required regulation......................................................................................... 40

1.5 NORSOK Compliance....................................................................................... 40

2 Measurements of the relevant air properties and qualities................................ 41

2.1 Simplification of the documentation...................................................................41

2.2 Parameters to be verified by measurements....................................................... 41

2.3 Test program.................................................................................................. 41

2.4 Measurement guidelines...................................................................................41

2.5 Measurement standard.....................................................................................42

2.6 Test locations in the accommodation................................................................. 42

2.7 Test locations in workspaces.............................................................................42

3 Test conditions...................................................................................................43

4 System requirements......................................................................................... 43

4.1 Redundancy.................................................................................................... 43

4.2 System failure................................................................................................ 43

4.3 Maintenance................................................................................................... 43

4.4 Filters............................................................................................................ 44

Chapter 3 Classification and certification........................45Section 1 General requirements........................................................................................ 45

1 Introduction....................................................................................................... 45

1.1 General.......................................................................................................... 45

1.2 Objective........................................................................................................45

1.3 Applicable rules...............................................................................................45

2 Application......................................................................................................... 45

2.1 Deviations and exceptions................................................................................ 45

2.2 Alternative solutions........................................................................................ 45

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2.3 Execution....................................................................................................... 46

Section 2 Classification......................................................................................................47

1 Introduction....................................................................................................... 47

2 Class notation and qualifiers............................................................................. 47

2.1 General.......................................................................................................... 47

2.2 Compliance with NORSOK................................................................................ 47

2.3 Overview........................................................................................................ 47

3 Information and documentation........................................................................ 47

3.1 Documentation................................................................................................47

3.2 Content requirements...................................................................................... 49

4 In-service requirements.....................................................................................50

4.1 Alterations and modifications............................................................................ 50

4.2 Documentation storage.................................................................................... 50

4.3 Renewal......................................................................................................... 50

Section 3 Measurement equipment....................................................................................51

1 Certification........................................................................................................51

Historic changes............................................................. 52

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CHAPTER 1 INTRODUCTION

SECTION 1 GENERAL

1 IntroductionThis standard contains requirements for noise, vibration, illumination and indoor climate on board offshorefacilities.

2 ObjectiveThe objective of this standard is to:

— Serve as a reference document in contractual matters between purchaser and contractor— Serve as a guideline for designers, purchasers and contractors— Specify noise, vibration, illumination and indoor climate requirements and procedures for offshore units.

3 ScopeThis standard describes sets of limits for noise, vibration, illumination and indoor climate for use on boardoffshore facilities.This standard has been written for general world-wide application. Local governmental regulations mayinclude requirements stricter than listed in this standard depending on the type, location and intendedservice of the offshore unit.This standard aims at attaining an offshore unit with controlled and controllable working environment.Compliance with the rules is to be verified through field measurements of defined parameters.Prescriptive requirements are not intended to inhibit application of practicable improvements.

4 ApplicationThis standard applies primarily to mobile and floating offshore units (MOU). However, this standard may beused in connection with all kind of offshore units in the oil & gas industry as:

— Floating and mobile offshore units— Fixed offshore installations— Complete installations or single modules— New buildings, conversions and modifications.

This standard is not to be applied on ships like e.g. offshore support vessels, shuttle tankers etc. For suchvessels reference is given to the rules for ships.This standard may be applied at all development stages from pre phase design to final construction andcommissioning.Unless specifically mentioned this standard applies when the offshore unit is in normal operation. For self-propelled mobile offshore units this standard also applies during transit.For mobile offshore units, this standard may be used as technical basis for offshore classification. Detailprocedural requirements for such an application are described in Ch.3.

Guidance note:

As detailed in Ch.3, the application of the standard for offshore classification is governed by class notations. As an example, complianceto the requirements to NORSOK S-002 as given in Ch.2 is only required for units with the class notation Comf-MOU(N).

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5 StructureThis standard is structured in the following three chapters:

— Ch.1: This first introduction chapter is completed with references, abbreviations and definitions— Ch.2: The second chapter includes the technical requirements relevant for describing the working

environment on board in terms of noise, vibration, illumination and indoor climate— Ch.3: The third chapter describes the procedures to be followed when this standard is used as technical

basis for offshore classification (as applicable for MOU’s)

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SECTION 2 REFERENCES

1 GeneralRelevant national and international standards specifying criteria related to comfort aspects of noise,vibration, illumination and indoor climate have been used as basis for this standard combined with knowledgeabout achievable offshore levels applying good engineering practice.

2 Normative referencesThe normative references are cited at appropriate places in the text. For dated references, only the editioncited applies.

3 NoiseTable 1 Informative and normative references with regard to noise

Reference Edition Title

IEC 61672-1 Electro acoustics – Sound level meters – Part 1: Specifications

ISO 80000-8 2007 Quantities and units – Acoustics

ISO 1683 Preferred reference values for acoustical and vibratory levels

ISO 717-1 2013 Acoustics – Rating of sound insulation in buildings and of building elements – Part 1:Airborne sound insulation

ISO 717-2 2013 Acoustics – Rating of sound insulation in buildings and of building elements – Part 2:Impact sound insulation

ISO 16283-1 2014 Acoustics – Field measurements of sound insulation in buildings and of building elements– Part 1: Airborne sound insulation

ISO 140-7 1998 Acoustics – Measurements of sound insulation in buildings and of building elements –Part 7: Field measurements of impact sound insulation of floors

ISO 10140-2 2010 Acoustics – Laboratory measurements of sound insulation of building elements – Part 2:Measurements of airborne sound insulation

ISO 2923 1996 Acoustics – Measurement of noise on board vessels

NORSOK S-002 2004 Working Environment

MSC.337(91) Code on noise levels on board ships

4 VibrationTable 2 Informative and normative references with regard to vibration


ISO 6954 2000 Mechanical vibration and shock – Guidelines for the overall evaluation of vibration inmerchant ships

ISO 2041 2009 Mechanical vibration, shock and conditioning monitoring – Vocabulary

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ISO 2631-1Amd 1

19972010

Mechanical vibration and shock – Evaluation of human exposure to whole body vibration– Part 1: General requirements

ISO 2631-2 2003 Mechanical vibration and shock – Evaluation of human exposure to whole body vibration– Part 2: Vibrations in buildings (1 – 80 Hz)

ISO 6897 1984 Guidelines for the evaluation of the response of occupants of fixed structures, especiallybuildings and off-shore structures, to low-frequency horizontal motion (0,063 to 1 Hz)


5 IlluminationTable 3 Informative and normative references with regard to illumination


EN-12464-1 2011 Light and Lighting – Lighting of work places – Part 1: Indoor work places

EN-12464-2 2014 Light and Lighting – Lighting of work places – Part 2: Outdoor work places

EN-12665 Light and Lighting – Basic terms and criteria for specifying lighting requirements

ISO 11064-6 2005 Ergonomic design of control centres – Part 6: Environmental requirements for controlrooms

EN-1838 2013 Lighting applications – Emergency lighting

CIE 97 2005 Maintenance of indoor electric lighting systems

ISO/CIE 19476 2014 Characterization of the performance of illuminance meters and luminance meters

NORSOKS-002

2004 Working Environment

DIN 5032-7 1985 Photometry; classification of illuminance meters and luminance meters

DIN 5034-5 2010 Daylight in interiors; measurement

DIN 5035-6 2006 Artificial lighting – Part 6: Measurement and evaluation

IMO ResolutionA.1023(26) (MODUCode)

2009 Code for the construction an equipment of Mobile Offshore Drilling Units

SOLAS Ch.II-1 PartD Reg-41

2010 International Convention for the Safety of Life at SeaMain source of electrical power and lighting systems

MSC/Circ. 982 2000 Guidelines on ergonomic criteria for bridge equipment and lay-out

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6 Indoor climateTable 4 Informative and normative references with regard to indoor climate


ISO 7547 Shipbuilding – Air-conditioning and ventilation of accommodation spaces on board ships –Design conditions and basis of calculations

ISO 7730 Ergonomics of the thermal environment – Analytical determination and interpretation ofthermal comfort using calculation of the PMV and PPD indices and local thermal comfortcriteria

ISO 7726 Ergonomics of the thermal environment – Instruments for measuring physical quantities

ASHRAE 1991 Applications handbook

ANSI/ASHRAEStandard 55

2004 Thermal Environmental Conditions for Human Occupancy

ANSI/ASHRAEStandard 62.1

2007 Ventilation for Acceptable Indoor Air Quality

CIBSE 1)CommissioningCode A

1996(2006)

Air Distribution Systems


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SECTION 3 ABBREVIATIONS AND DEFINITIONS

1 Definition – type of offshore unitsA list of various types of offshore units is given below. There may be other types of offshore units in the oil &gas service not in this which qualifies for this standard.

Table 1 Definition of terms

Term Definition

MOU Mobile Offshore Units

Fixed offshore Unit An offshore installation not to be moved to another location. Fixed installations couldtypically be steel jackets and other installations mounted to the sea bed.

2 Definition – main parametersThe main parameters determining the human comfort are defined below. Further definitions of sound andvibration quantities and units are given in ISO 80000-8: 2007 and ISO 1683:2008.

Table 2 Definition of terms

Term Definition

Noise Audible air pressure fluctuations generated by the machinery, equipment and structure inthe 20 – 20 000 Hz frequency range

Noise levelA-weighted sound pressure level LAeq(T) in dB, measured with a sound level meter inwhich the frequency response is weighted according to the A-weighting curve (ref. IEC61672-1)

Continuous noise level A noise level that does not change over time, dB

A-weighted noise level The noise level as described/measured with the A-filter, dBA

C-weighted noise level The noise level as described/measured with the C-filter, dBC

A-weighted maximum noiselevel

The maximum noise level within a given time period measured with the FAST-response,dBA-FAST

C-weighted maximum noiselevel

The maximum noise level within a given time period measured with the PEAK-response,dBC-PEAK

Occupational time The duration of exposure to noise and vibration levels

Personnel noise exposurelevel

Personnel noise exposure is the equivalent sound pressure level to which a person isexposed to for a defined period of time.

Sound absorptioncoefficients

The ratio between the absorbed sound energy and the energy of the sound wave impingingon a surface. In this context this is about the same as the ratio between the reflected andthe impinging sound wave relative to a defined surface

Average sound absorptioncoefficients

In this context, the average absorption coefficient representing the space averaged andfrequency averaged (over the octave bands 250 – 2000 Hz) sound absorption with a singlenumber

Airborne sound insulation Airborne sound insulation of partitions as defined in ISO 16283 and ISO 717-1

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Term Definition

Impact sound insulation Airborne sound insulation of floors as defined in ISO 140-7 and ISO 717-2

Vibration Structural motion in the frequency range 1 – 80 Hz

Vibration velocity The overall frequency weighted RMS value of vibration velocity measured in accordancewith ISO 6954: 2000

Overall vibration levelOne number describing the integrated vibration level within a certain frequency range. Inthis standard the overall vibration velocity level is given for the frequency range 1 – 80 Hzand is expressed as the velocity (mm/s RMS)

Overall acceleration levelOne number describing the integrated vibration level within a certain frequency range. Inthis standard the overall vibration acceleration level is given for the frequency range 0.5 – 1Hz and is expressed as the acceleration (mm/s2 RMS)

Illumination The lighting conditions in an area

Illuminance The luminous flux incident-per-unit area, i.e. the amount of light falling on an object orsurface. Illuminance is measured in units of lux (lm/m2).

Mean illuminance The mean illuminance in lux as measured over a defined area. Denoted Em

Maintained illuminanceMinimum average permitted illumination for an area/room in lux, i.e. the averageillumination over an area/room at the time when maintenance should be carried out (ref.EN 12665)

Uniformity of illumination Ratio of minimum illuminance to average illuminance of a surface. Denoted U0

Maintenance factor Factor describing reduction in illuminance due to usage of luminaries over time, cleanlinessetc.

Visual task Visual elements of the work being done

Task area A confined area in the work space where visual tasks take place, e.g. an office desk, workbenches etc. The size of the task area varies according to the task carried out

Immediate surroundingarea An area around the task area within the visual field. At least 0.5 m wide

Background area The area outside/adjacent to the immediate surrounding area

Task light Lighting mounted with the purpose of providing light in confined areas and for special tasks.This may e.g. be reading light in cabins and in offices

General illuminationLighting designed to provide a substantially uniform level of illuminance throughoutan area, exclusive of any provision for special, localized tasks. Such lighting should beprovided by fixed luminaries.

Illuminance grid A system of points for calculations and measurement of the illumination, ref. EN-12464

Emergency lighting Lighting for use when the normal power supply fails

Indoor climateThe indoor climate is in this context defined by the following descriptors: Indoortemperature, temperature gradient, air velocity, air supply (carbon dioxide concentration)and humidity

Air supply quantity The total amount of supplied air to any given space which may consist of a percentage re-circulated return air in addition to the fresh air supply quantity

Air temperature controlspan The temperature interval which each designated space shall be able to satisfy

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Term Definition

Air velocity The measured mean absolute velocity of a mass of air in motion

Ambient outside airtemperature

The actual air temperature measured out of direct sun exposure outside the facility,expressed in ºC

Fresh air supply quantity The quantity of fresh/outside air per person supplied to a space, expressed in l/s or m3/h.

Temperature The average dry bulb temperature of a specific number of temperature measurements in aparticular space, expressed in °C

Thermal comfort A temperature range perceived as comfortable for most persons indoor

Vertical gradient Vertical air temperature difference

Relative humidityRelative humidity is the actual amount of water vapour in the air compared to thesaturation amount of water vapour in the air at the same temperature and pressure.Usually expressed as percentage of saturated air having a relative humidity of 100%

Relative humidity range The range of which the relative humidity must be within during all external conditions theHVAC is designed for

3 Definitions and characteristics – systems and componentsThe most commonly used expressions, concepts and systems in relation to offshore units and the workingenvironment as covered in this standard are defined below.

Table 3 Definitions and characteristics of system and components

Term Definition

Accommodation areaSpace used for cabins, offices, lavatories, corridors, hospitals, cinemas, public spaces etc.Service spaces and control stations may be included within the accommodation area.

Cabin An accommodation room intended for sleeping or recreation only

Recreation room General leisure areas like lounges, coffee bars but also TV rooms, cinemas, multipurposeroom etc.

Control room or controlstation

General term for any location space where essential control functions are performed duringtransit, normal operations or emergency conditionsTypical examples are central control room, radio room, process control room, bridge,emergency response room etc. For the purpose of compliance with the SOLAS Conventionand the MODU Code, the emergency generator room, UPS rooms and fire pump rooms aredefined as control stations. However, emergency generator room, UPS rooms and firepumpsrooms are not control rooms from a working environment point of view.

Office Space for intellectual activities including discussions/meetings between a small number ofpersonnel

Workshop Areas for maintenance of equipment like machines, valves, electronics etc.

Machinery area Pump area, power plants, HPU rooms, compressor areas but also production/utility areaswith process, thermic fluids or water pipes

Outdoor areaA collective term for the areas out in the open. It may be open deck areas, walk ways etc.In principle the concept contains outdoor muster areas, store areas and laydown areas.However, such designated areas are handled by its own name and may have other criteria.

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Term Definition

Utility area

Areas for combustion equipment, power generation, switchboards, boiler, water injectionFacilities like workshops, storage areas and general machinery

A utility area should not include production, drilling or wellhead equipment, and will notnormally be classified as significant hazardous areas.

Work area Area of the installation where personnel stays or move in connection with work

Living area Area of the installation where personnel stays or move in connection with non-workingactivities

Permanently manned Work area or workplace manned at least 8 h a day for at least 50 % of the installation'soperation time

Intermittently manned Work area or workplace where inspection, maintenance or other work is planned to last atleast 2 h a day for at least 50 % of the installation's operation time

Normally unmanned Work area or workplace that is not permanently or intermittently manned

Task area Area within which a visual task is carried out

Immediate surroundingarea A band surrounding the task area within the visual field

In the case of disagreement between the parties of the status of some rooms/areas, DNV GL shall decide.

4 AbbreviationsThe most commonly used abbreviations in relation to offshore units and the working environment as coveredin this standard are as defined below.

Table 4 Description of abbreviations

Abbreviation Description

ASHRAE American Society of Heating, Refrigeration and Air-Conditioning Engineers

CIBSE The Chartered Institute of Building Service Engineers

HVAC Heating, ventilation and air conditioning

IEC International Electro technical Commission

IMO International Maritime Organization

ISO International Organization for Standardization

CIE International Commission on Illumination

NORSOKNORsk SOKkels konkurranseposisjonNorwegian Oil Industry Association and the Federation of Norwegian Engineering Industries

MSC Marine Safety Committee

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CHAPTER 2 TECHNICAL REQUIREMENTS

SECTION 1 INTRODUCTION

1 OverviewThis section states requirements for noise, vibration, illumination and indoor climate for three differentratings. Selection of one of the three ratings determines all the various working environmental qualifiersrelated to noise, vibration, illumination and indoor climate on board the offshore facility.Where applicable, references are made to national and international recommendations, standards andguidelines on the noise, vibration, illumination and indoor climate for use on board offshore facilities.It is noted that there may be national and/or company specific requirements which may be different than therequirements listed in this standard.

2 Enforcement of limitsAll limits specified in the tables below shall be fulfilled. However, dispensations from certain requirementsmay in special circumstances be acceptable if it is documented that compliance will not be possible despiterelevant and reasonable technical reduction measures.

Guidance note:

Guidelines for handling excessive noise, vibration and illumination levels are published by DNV GL.


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SECTION 2 NOISE AND ACOUSTICS

1 Area noise level limits

1.1 IntroductionThis standard states requirements for noise, related to human comfort and working environment on boardoffshore facilities. The most typical areas are listed in Table 1 below. For areas not included, limits for areas/rooms with a similar need for comfort/ working environment shall be selected.

Table 1 Total area noise level limits on board offshore units 8)

Comfort rating number (crn)

Location 1[dBA]

2[dBA]

3[dBA]

Process and utility modules:

Unmanned machinery rooms(combustion engines, fire water units, BOP control unit etc.)

110 1) 110 110

HVAC rooms 85 90 110

General process and utility areas(turbo machinery, compressors, pumps, fans etc.)

85 90 90

HPU rooms 90 2) 90 110

BOP & wellhead areas 85 90 90

Normally unmanned outdoor areas e.g. moon pool 85 90 90

Trafo, switchboards & battery rooms 85 90 90

External walk- & access ways 80 85 85

Stairs & walkways in modules 60 – 80 3) 85 85

Lay down area 75 85 85

Muster area 75 85 85

Local eqip./instr. room 75 85 90

Heavy tool store and similar store rooms/areas 75 4) 85 90

Workshop, paint shop etc. 70 4) 70 85

Crane cabin 5) 65 70 75

Coffee bar outside LQ 65 4) 70 75

Laboratory 60 60 70

Local control room 60 60 75

Corridors/stairs in enclosed machine/work area 80 85 90

Workshop office / store office etc. 50 60 65

Central control room 50 4) 55 75

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Location 1[dBA]

2[dBA]

3[dBA]

Drilling Modules:

Cementing unit, HP mud pump and HPU rooms 90 2) 90 90

Mud mixing, mud cleaning, shale shaker room 85 90 90

Drill Floor, monkey board & pipe rack area 85 90 90

Drill floor shelter and Pipe Rack Shelter 60 70 75

Operators cabin in drilling units(Drillers cabin & mud, cement, shaker room etc.)

60 65 75

Mud lab 60 65 75

Accommodation Spaces:

HVAC 85 90 110

Techn. rooms / electro rooms 85 90 90

Dish washing / scullery / laundry – machine area 75/85 6) 85 90

Open deck recreation areas 75 75 75

Stores / general store 70 4) 70 90

Laundry – area for sorting, folding, ironing etc. 65 70 90

Galleys, without food proc. eq. 60 60 75

Corridors, change rooms & toilets 60 60 75

Mess rooms / dining rooms / gymnasium 55 55 60

Servery and pantries 60 60 75

Telecom & radio equip. room 7) 75 90 90

Radio room 50 4) 50 60

Offices, meeting & conf. Room 50 4) 55 60

Cabins 45 4) 45 55

Hospital/ward 45 4) 45 55

Coffee bars 50 4) 50 60

Recreation rooms 50 4) 50 60

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Location 1[dBA]

2[dBA]

3[dBA]

1) Machine rooms with equipment running without special attention. Necessary dials and controls should be outside themachine room. Only very brief inspections are allowed. No passage through the rooms to other areas.

2) 90 dBA applies during operation of the equipment with maximum permitted stay per day of 1 hour. Duringmaintenance, cleaning etc. the noise limit of 85 dBA applies

3) The noise level shall comply with the surrounding areas, i.e. for stairs/corridors in quiet areas like the LQ a noiselevel limit 60 dBA applies while 80 dBA applies for corridors in machinery areas

4) For fixed installations, the total area noise level requirement shall be 5 dBA stricter5) Crane operator cabin – Applies to a full crane operation cycle6) In separate rooms dedicated to unattended operation of scrub, coarse pot equipment and laundry machinery, 85

dBA applies7) These rooms are equipment room. The operator dependent communication is assumed to take place in the radio

room or by phone in offices etc.8) Ear protectors shall be available and used while entering areas with noise levels above 85 dBA

1.2 Additional area noise level requirements

1.2.1 For the highest level of comfort crn 1 the noise contribution from the HVAC shall be at least 5 dBAlower than the total area noise level limit as listed in Table 1.

1.2.2 For the highest level of comfort crn 1, noise levels inside cabins with sleeping personnel shall notexceed 55 dBA during helicopter take-off/landing operations.

1.3 Maximum noise levelsIn addition to the area noise level limits defined in Table 1 the maximum permitted noise levels shall notexceed the levels presented in Table 2.

Table 2 Maximum permitted noise level on board caused by machinery or process


Location 1[dBC peak]

2[dBC peak]

3[dBC peak]

Maximum permitted noise levels 130 135 135

1.4 Personnel noise exposure

1.4.1 The concept of personnel noise exposure levels has become the most important issue regarding noiseand working environment, and describes the noise energy the personal will be exposed to during theirwork shifts. The personnel noise exposure depends on the combination of area noise levels and the areaoccupational times. The personnel noise exposure must be calculated and the result compared with therecommended limits listed in Table 3.

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Table 3 Recommended maximum personnel noise exposure


Location 1[dBA]

2[dBA]

3[dBA]

All personnel categories for a 12 hour period 83 85 87

1.4.2 In the calculation of the personnel noise exposure for comparing with the limits listed in Table 3personnel noise protection shall only be assumed in engine rooms (with area noise level limits of 110 dBAand on the helideck with helicopters).

1.4.3 In general, a personnel noise exposure study shall be provided for approval. This calculation of thepersonnel noise exposure levels shall be based on the manning study and measured area noise levels.

1.4.4 In the case area noise levels on board exceed the noise level limits given in Table 1, the personnelnoise exposure study will be particular important. Based on the combination of the actual area noise levels,possibilities for noise reduction and the personnel noise exposure levels may the measured deviations beaccepted or rejected.

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2 Building acoustic requirements

2.1 Airborne sound insulation

2.1.1 Limits for the airborne sound insulation between the different types of room are specified in thisdocument. The rooms are classified according to the activities.

Guidance note:

For airborne sound insulation reference is given to the ISO standards ISO 16283-1 and ISO 717-1 regarding the definition of theapparent sound reduction index as measured on board. For further details about the measurements see [3.1].

As a guide the various criteria to sound reduction indices are listed below in Table 4. These sound insulation indices refer to fieldmeasured sound insulation, not laboratory sound insulation for building components or measurements in mock-ups. However, soundinsulation tests in Mock-Ups provide very good indications and are recommended to be performed before installation on board.

Table 4 Airborne sound insulation requirements for fixed, floating and/or mobile units


Location 1[R'w, dB]

2[R'w, dB]

3 1)

[R'w, dB]

Between cabins and other “low noise rooms” 45 40 35

Between cabins and corridors/stairways 40 35 30

Between cabins and "work rooms" 55 45 45

Between work rooms 40 35 30

Between work rooms and corridors 35 30 30

Between noisy rooms 35 30 25

Between noisy rooms and corridors 35 30 25

Technical rooms and “low noise rooms” 60 55 45

Technical rooms and work rooms 55 50 40

Technical rooms and corridors/stairs 50 45 40

1) For crn 3 it is sufficient to provide the laboratory measured sound insulation index Rw. The laboratory measured soundinsulation index must be at least 3 dB higher than the requirement given as the field measured index R'w.

2) The general room types in Table 4 designate the following room:

— "Low noise rooms”: Cabins, hospital, rest rooms etc.

— “Work rooms”: Offices, meeting rooms, conference rooms, control rooms, radio rooms

— “Noisy rooms”: Exercise rooms, television/cinema, printer/computer rooms, galley etc.

— "Technical rooms": Electrical panels, transformers, HVAC etc.


2.1.2 In principle, cabins shall not be located adjacent to “noisy rooms” (as listed above) or other locationswith comparatively high noise levels. Corridors in the accommodation areas which lead to noisy areas shallbe fitted with a buffer zone, i.e. two doors with a space in between. Care shall be taken to prevent airbornenoise transmission between rooms through HVAC ducts and electrical installations.

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Guidance note:

Mainly due to a multitude of transmission paths field measurements normally yield a lower sound reduction index than results obtainedin a laboratory for the same partition. Therefore it is recommended during the engineering phase to select partition walls (e.g. panelsbetween cabins) with an associated laboratory measured sound reduction index at least 3 dB higher than the limit specified in Table 4.


2.2 Impact sound insulation

2.2.1 Limits for the normalized impact sound pressure level in the vertical direction between the differenttypes of room are specified as a part of the offshore class. These limits apply only in the cases where thereceiving room is a cabin or a "low noise room". The rooms are classified according to the activities. Thisspecification applies only to crn 1.

Guidance note:

For the impact sound insulation reference is given to the ISO standards ISO 140-7 and ISO 717-2 for the definition of the fieldmeasured normalized impact sound pressure level as measured on board.

As a guide the various criteria to sound reduction indices are listed in Table 5 below. The indices in Table 5 refer to field measured,i.e. the weighted apparent normalized impact sound pressure level as measured on board, not in laboratories.

For explanation of the general room types in Table 5 see [2.1].

Table 5 Impact sound insulation requirements for offshore units

Locationcrn 1

[L'n,w dB]crn 2

[ L'n,w dB]crn 3

[ L'n,w dB]

Between cabins and/or “low noise rooms” 50 - -

Between “work rooms” and cabins/“low noise rooms” 50 - -

Between "noisy rooms” and cabins/“low noise rooms” 50 - -


Guidance note:

Due to a multitude of transmission paths field measurements normally yield a higher normalized impact sound pressure level thanresults obtained in laboratories. It is therefore recommended during the engineering phase to select and evaluate deck constructions(e.g. steel decks with various deck coverings and top layers) with associated laboratory measured normalized impact sound levelsat least 3 dB lower than the limit specified in this standard.


2.2.2 In order to ensure proper acoustical conditions the following minimum requirements for acousticabsorption coefficient apply:

Table 6 Limits for the average sound absorption coefficient for the frequency range 250 Hz to 2kHz

Location crn 1 crn 2 crn 3

Workshops – Laboratories ≥0.2 - -

Control rooms, meeting rooms & offices ≥0.2 - -

Dining rooms ≥0.2 - -

Coffee bars & recreation rooms ≥0.2 - -

Cabins ≥0.2 - -

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3 Measurements of area noise levels and acoustical properties

3.1 Measurement standards and guidelines

3.1.1 The measurements of area noise levels shall be carried out according to the procedures described inISO 2923 during a representative operating condition. When the procedure de-scribed in ISO 2923 deviatesfrom any requirements or procedure mentioned in this standard, the requirements in this standard takeprecedence.

3.1.2 In areas with particularly high continuous noise levels and/or where pressure releases occurs shall themaximum noise levels be recorded as C-weighted peak sound levels.

3.1.3 The instrumentation to be used for the noise level measurements must be a Type 1 instrument incompliance with the requirements given in ISO 2923.

3.1.4 For sound insulation and the average sound absorption testing, equipment as specified in ISO 16283-1and ISO 140-7 shall be used for the measurements of airborne and impact sound insulation, respectively.The measurements and analyses shall be carried out by using 1/3-octave bands. The calculation of theairborne sound and impact sound insulation index shall be performed according to the ISO 717-1 and ISO717-2, respectively. The average sound absorption coefficients will be calculated based on the measuredreverberation times.

3.1.5 In contradiction to the partition area defined in ISO 16283-1 the partition area used in theseevaluations shall be 5 m2 as a minimum in order to avoid unreasonable low apparent airborne soundinsulation index for very small partitions e.g. between corridors and cabins.

3.2 Test programsA test program for the acoustic measurements (noise levels & building acoustic tests) shall be approved priorto the measurements. The test program should at least include the following information:

— Specification of measuring locations— Required operating conditions for the installation— Required operating conditions for relevant machinery on board— Instrumentation to be used.

The test program shall be approved prior to the survey.

3.3 Measurement positions

3.3.1 In general, the measuring positions for area noise levels must be selected to give a representativedescription of the noise situation on board the offshore facility. Higher density of measuring positions maybe required in areas near noise sources and in noise sensitive areas. The measurement position shall beindicated in the measurement procedure (see [3.2]).

3.3.2 The area noise level limits do not apply closer than 1 m from any noisy equipment or bulkheads/decksor within the skid for larger equipment packages.

3.3.3 Field measurements of airborne sound insulation and impact sound insulation shall be performed forrepresentative partitions. The reverberation times for calculation of sound absorption coefficients shall becarried out in key locations for which the results may be made applicable also for other rooms (see also[3.2]).

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3.4 Amount of test locations

3.4.1 For the number of accommodation cabins to be tested for noise, the following may be used as a guide:

— For installations with less than 50 cabins, noise measurements shall be taken in at least 50% of cabins.— For installations with 50 to 100 cabins, noise measurements shall be taken in at least 1/3 of all cabins, but

not less than 25 cabins.— For installations with more than 100 cabins, noise measurements shall be taken in at least 1/5 of all

cabins, but not less than 33 cabins.

3.4.2 For sound insulation tests, the following may be used as a guide:

— Airborne sound insulation – All type of partitions related to cabins shall be tested, minimum 4 at eachdeck with cabins.

— Impact sound insulation – Focus shall be given to partitions with hard deck covers in the excitation roomand cabins as receiver rooms. Minimum 4 partitions altogether.

3.5 Measurement requirementsFor the measurements, the following applies:

1) All noise levels shall be measured as A-weighted overall equivalent noise level2) Maximum noise levels, where applicable, shall be recorded as C-weighted peak noise level3) If the specified criterion is exceeded, 1/3-octave band analysis of the noise shall be performed4) The A-weighted overall equivalent noise level shall be measured over a sufficiently long period of time.

In cabins where the noise level does not change with time, 10 sec. is sufficient measurement duration.In working areas where the noise varies with time the measurement should last until the equivalentnoise level is close to stationary.

5) When the noise varies during operation, the noise for complete operating cycle shall be measured andthe resulting equivalent noise level for a longer period shall be calculated.

3.6 Reporting

3.6.1 The report shall comply with the requirements in ISO 2923. The noise levels given in dBA shall belisted in tables and preferably plotted on general arrangement drawings of the offshore installation. Themaximum noise levels given in dBC ‘peak’ shall for relevant areas be listed in tables.If applicable, the results from the building acoustic measurements shall be presented in the same report.

3.6.2 Operating condition of relevant machinery such as thrusters, engines, generators, drilling equipment,pumps, turbines, compressors etc. shall be documented. Deviation from the approved operating condition forsome of the equipment shall be highlighted.

3.6.3 If the specified noise criterion is exceeded, the measured noise level shall be provided in 1/3-octavebands.

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4 Test conditions

4.1 IntroductionThe required conditions to be fulfilled during the area noise level measurements are based ISO 2923. Themajor conditions to be fulfilled are described below. When the test conditions described in the referenced ISOstandards deviate from any requirements or procedure mentioned in this standard, the requirements in thisstandard take precedence.The building acoustic tests may preferably be carried out in a quiet installation.

4.2 Preferred operating condition

4.2.1 The measurements of the area noise levels shall be performed during normal full production, orsimulated normal full production, with all machinery running in representative normal operating conditionaccording to the building specification, or conditions which are agreed between the owner and yard. Therotation speed, pressure, flow etc. shall be according to normal rating of the equipment.

4.2.2 If applicable, the noise shall also be tested during transit. In such cases, the power output on thepropulsion plant shall correspond to the contractual normal sea going condition, or at least 80% of maximumcontinuous power available for the propulsion plants. All other machinery like e.g. power generation plantand HVAC systems shall be run at rated capacity.

4.2.3 Provided the offshore installation is designed to operate on dynamic positioning (DP), the powergeneration, the thrusters and the necessary production systems must be in operation during the noisemeasurements. Unless the contracts states otherwise, all thrusters shall be run at minimum 40% of theirmaximum continuous rating.

4.3 Alternative test procedures and operating condition

4.3.1 If noise testing during full production or simulation of full production is not possible, it is allowed tomeasure the noise impact from one system, or a limited number of systems, at a time. A representativeoperating condition for the systems under test must be simulated. The measured noise levels for the varioussystems in operation shall later on be combined to represent simultaneous operation of all relevant systems.

4.3.2 If acceptable and meaningful operating conditions may be created, it is allowed to measure the noisein one module at a time.

4.3.3 An approach with noise tests carried out system by system or module by module, shall be approved oncase-by-case prior to the test.

4.3.4 If it is not possible to run the equipment at an representative operating condition during thecommissioning or sea trials, the remaining tests may be carried out offshore during the commissioningoffshore or shortly after startup. In cases where local authorities are involved this has to be clarified inadvance.

4.3.5 All HVAC systems must be running at balanced rated capacity.

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4.4 Environmental conditions

4.4.1 The noise measurements in e.g. pontoons or hull when thrusters are in operation shall be conducted inwater depth not less than 3 times the draught of the offshore unit.

4.4.2 The measurements during transit condition, if applicable, shall be taken while travelling straight ahead,i.e. the azimuth at 0 degrees ±2 degrees and minimum rudder action.

4.4.3 The measurements during DP condition, if applicable, shall be taken with all thrusters intended tobe used during these operating conditions operating at approx. 90 degrees azimuth and the vessel movingsideways.

4.4.4 The wind speed and waves during the measurements shall be sufficiently low in order to avoidsignificant interference from wind and wave generated noise.

4.4.5 The loading condition(s) of the offshore installation is to be as close as possible to normal operatingcondition(s). The loading condition(s) to be used shall be approved prior to the measurements.

4.4.6 Any divergence from the above mentioned conditions shall be clearly stated in the report.

4.5 Test areas - State of completion

4.5.1 The rooms in the accommodation shall preferably be fully equipped with wall liners, deck covering(carpets, vinyl, etc.), suspended ceilings, curtains, furniture, etc.

4.5.2 In the working areas, the specified fire, thermal and acoustic insulations shall preferably be in place.

4.5.3 HVAC and air supply/extract systems for working/process/utility areas shall run at a balanced ratedcapacity during the tests. Doors and windows are to be closed.

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SECTION 3 VIBRATION

1 Vibration limits

1.1 ObjectiveThis standard provides requirements for vibrations related to human comfort and working environment onboard offshore facilities. The limits are applicable for both vertical and horizontal direction.This standard applies to all spaces on board the offshore unit. The most typical areas are listed in Table 1below. For areas not included, limits for areas/rooms with a similar need for comfort/ working environmentshall be selected.

Table 1 Vibration limits with respect to human comfort for offshore units

Weighted overall vibration velocity [mm/s RMS] 1) 2) 3)

Comfort rating number (crn)Location

1 2 3

Cabins 0.6 1.5 3.0

Mess / recreation rooms 0.6 1.5 3.0

Offices 0.6 1.5 3.0

Control rooms 1.0 1.5 3.0

Work places 3.0 3.5 4.0

1) To be measured vertically and horizontally.2) Frequency range 1 – 80 Hz3) For slender constructions e.g. cranes, helicopter decks etc., see [3.1.4]

1.2 LimitationsThe requirements described in this section only consider steady-state vibrations, normally caused byharmonic excitation. Requirements for transient vibrations are outside this standard's scope. Some specialcomments and a guidance note for use in crane cabins are presented in [1.4] below.

1.3 Pedestal constructionsHigh vibration levels in the low frequency range may be experienced in pedestal cranes due to cranemanoeuvring like hoisting, luffing and slewing with sudden starts and stops. The resulting self-excitingvibrations in the crane cabins may be significant from a human comfort and a safe crane operation pointof view. Low internal damping of a slender pedestal construction may cause the pedestal top to swayhorizontally for a long period of time.The same applies to other slender constructions like helicopter decks and constructions with large overhang.

Guidance note:

The fundamental frequencies for such movements are typically between 0.5 – 3 Hz, while the full frequency range of interest is upto 80 Hz. The corresponding vibrations shall preferably be below the following:

— Frequency range 0.5 – 1.0 Hz: Acceleration below 0.0315 m/s2 RMS

— Frequency range 1 – 80 Hz: Velocity below 4.0 mm/s RMS


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2 Measurements of vibrations

2.1 Measurement standard

2.1.1 The measurements shall be carried out according to the procedures described in ISO 6954: 2000.When the procedure described in ISO 6954:2000 deviates from any requirements and procedure mentionedin this standard, the requirements in this standard takes precedence.

2.1.2 The measurements shall be performed with signal processing equipment with the capability toproduce both overall vibrations levels and frequency spectra. Where vibrations above the limits are recorded,frequency spectra shall be presented. All other frequency spectra shall be stored and presented uponrequest.

2.2 Test programA test program shall be approved prior to the measurements. The test program shall at least include thefollowing information:

— Specification of measuring locations— Required operating conditions for machinery items— Instrumentation to be used.

2.3 Selection of measurement positions

2.3.1 The measuring positions shall be selected to give a representative description of the vibration situationon board the offshore unit. Higher density of measuring positions may be required in areas near vibrationsources and in vibration sensitive areas.

2.3.2 The number and location of the measuring positions shall be approved prior the vibration survey.

2.3.3 For offshore units with accommodation areas extended over a large portion of the offshore unit, themeasuring positions shall be evenly distributed throughout the decks.

2.3.4 Vibration measurements in cabins are normally to be taken at the floor in the approximate geometricalcentre of the room and shall reflect the vibration of the deck.For larger spaces (such as recreation rooms, messes areas etc.) it may be necessary to distribute a numberof measurement positions.

2.4 Number of measurement positionsFor the measurement of vibrations in different areas applies the following:

— Accommodation – Cabins & Recreation areas: At least 35% of the cabins on each deck level shall beselected for measurements.

— Working areas / Production areas: The vibrations shall be measured in all relevant areas/rooms. Inlarger areas/rooms, several measuring positions may be required. The measurement positions shall beconcentrated to areas where people normally reside.

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2.5 Measurement - units and equipmentFor the measurements and frequency spectra, the following analysis parameters shall be applied:

— The measured vibration levels shall be presented as one number representing the overall frequencyweighted RMS velocity level. Reference is made to ISO 6954:2000(E) for further details regarding theweighing curve.

— The measurements shall be executed with equipment and vibration transducers capable of measurementsfrom 1 Hz (0.5 for the pedestal cranes) to 80 Hz with a frequency resolution equal or better than 0.125Hz.

— The frequency spectra shall be generated utilising a window function which gives an accurate estimate ofthe amplitude value of the single peaks in the frequency spectra, e.g. flat top window.

2.6 Reporting

2.6.1 The measurement report for vibrations shall contain the following information:

— Main particulars of offshore unit, machinery and equipment— Loading condition of offshore unit where appropriate— Operating condition of relevant machinery such as thrusters, engines, generators, pumps, turbines,

compressors etc.— Sea and weather conditions (e.g. water depth, significant wave height, wind speed, etc.)— Plot plans showing the location of measuring positions and the measuring direction— Tables of all measured vibration levels. For results exceeding the criteria, frequency spectra shall be

provided— Details of type and make of the instrumentation which has been used, including type, window function,

averaging time and resolution— Calibration certificates of instruments— Name of surveying engineer/organisation.

2.6.2 Any divergence from the approved test plan shall be stated in the test report.

2.6.3 Any abnormal activities and/or other conditions which may have influenced the measurements shall bestated in the test report.

2.6.4 All frequency spectra shall be made available upon request.

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3 Test conditions

3.1 IntroductionThe test conditions for vibrations are equal to the test conditions for noise measurements described in Sec.2[4].

3.2 Comments regarding vibrationIn addition, reference is given to the items described below. The required conditions to be fulfilled during thetests are based on ISO 6954:2000. Major items are listed below. When the test conditions described in theISO standards deviate from any requirements or procedure mentioned in this standard, the requirementsherein take precedence.All decks: Shall be fully equipped with regard to outfit weights.Machinery areas – Process/Utility: A full test program shall be carried out with all machinery in normaloperation. In principle all rotating machinery which will be running during normal operation condition (suchas thrusters, engines, generators, mud pumps, turbines, compressors etc.) shall preferably be in operationduring the tests.

Guidance note:

However, it may be difficult to have all necessary equipment running simultaneously during the commissioning phase. Hence, wherepractical and technical feasible the vibration response may be measured area by area with only the relevant and dominating systems/equipment for the particular area of interest in operation. For operating conditions and further details Sec.2 [4] applies.


Drilling areas: If there is drilling equipment on board available for operation, this equipment shall berunning during the measurements. Otherwise, vibration tests of drilling and other specialised equipmentmust be tested after start-up.Ventilation: HVAC systems shall be running at a normal balanced rated capacity during the tests.Dynamic positioning and heading control: The operating condition shall correspond to a power suchas to maintain a stable position/optimum heading during normal operating condition of the offshore unit.If not otherwise stated in the building specification this condition shall be represented by a simulatedDP condition/heading control with at least 40% power on all thrusters intended to be used during theseoperating conditions.Transit: For offshore units intended to be in transit for longer periods, the test program shall include anormal transit condition correspond to the contractual condition, or at least 80% of maximum availablepower on each of the main propulsion propellers. All other machinery like e.g. power generation plant andHVAC systems shall be run at rated capacity.

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SECTION 4 ILLUMINATION

1 Area light limits

1.1 ObjectiveThe light condition offshore is of great importance to the personnel on board for carrying out their daily taskswith the expected precision and speed without being exhausted. This standard gives requirements for thelight in various areas based on recognized standards.This standard applies to all spaces on board offshore facilities. The most typical areas are listed in Table 1below. For areas not specifically mentioned, limits for areas/rooms with a similar need for comfort/ workingenvironment shall be selected.

1.2 LimitationsThe requirements described in this document shall be met during the normal operating condition of theoffshore facility. Hence, the emergency lighting is not part of this standard since it is fully covered by SOLASand the MODU code.

1.3 Illumination limits

1.3.1 Various standards and rules involving lighting are quite similar, and no justification is found for morethan one set of criteria for the lighting on board. The illumination limits given in Table 1 applies for comfortrating 1 and 2. The lighting condition on board offshore installations with comfort rating 3 is not evaluatedaccording to this offshore standard.

1.3.2 For areas not included in Table 1 limits for areas/rooms with a similar need for lighting shall beselected.

Table 1 Illumination limits for the various types of areas on board offshore units for crn 1 & 2 1)

Location

Maintainedillumination overthe areas/rooms

[Em, lux]

Minimumillumination

uniformity areas/rooms, U0

6)

Maintainedillumination over

the Task Area[Em, lux]

Process and utility modules:

General lighting 2),3) 200 ≥0.4 300

Lay down & muster area 200 ≥0.4 300

External/outdoor walk- & access ways 4) 100 ≥0.4 150

Indoor stairs, lifts & walkways in enclosed areas 4) 150 ≥0.4 200

Local equipment and instrument rooms 400 ≥0.4 750

Workshops, laboratory, offices 500 ≥0.6 750

Coffee bars outside LQ 150 ≥0.4 300

Crane cabins 400 Adjustable ≥0.4 750 Adjustable

Local control room 500 ≥0.6 750

Central control room 5) 500 Adjustable ≥0.6 750 Adjustable

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Location

Maintainedillumination overthe areas/rooms

[Em, lux]

Minimumilluminationuniformity

areas/roomsU0

6)

Maintainedillumination over

the Task Area[Em, lux]

Drilling modules:

General lighting 2),3) 200 ≥0.4 300

Drillers cabin, local control rooms, operator cabins500

Adjustable≥0.6

750Adjustable

Mud lab 300 ≥0.6 500

Drill floor & monkey board 350 ≥0.4 500

Shale shaker, slurry & cuttings areas 300 ≥0.4 500

Pipe rack area 200 ≥0.4 300

Accommodation spaces:

Techn. rooms / electro rooms, HVAC 200 ≥0.4 300

Corridors 150 ≥0.4 200

Cabins3) 150+reading ≥0.4 500(750)

Galley, cold & warm kitchen, prep. area 500 ≥0.6 750

Offices, meeting & conf. room, library, reading & trafficcontrol

500Adjustable

≥0.6750

Adjustable

Hospital/ward 500 ≥0.6 750

Telecom & radio equip. room 400 ≥0.4 750

Recreation rooms/lounges/coffee Bars 150 ≥0.4 300

Change room, Toilets 200 ≥0.4 300(500)

1) For compliance with NORSOK S-002 some minor adjustments may be needed. These shall be considered on a case-by-case basis.

2) The general lighting requirement applies to, but is not limited to, areas like general process & utility areas, machinerooms and electrical rooms etc.

3) The illumination in the immediate surrounding areas of the task areas shall not be less than one step down thepreferred scale of illumination as presented in EN-12464-1, paragraph 4.3.2.

4) In stairs and walkways it is important to have proper lighting at the steps and deck. See chapter 4.1.55) For the central control room special requirements apply, ref. ISO 11064-66) In general the illumination uniformity (U0) must be increased if compliance with NORSOK is requested.

1.4 Preliminary analysis

1.4.1 A preliminary analysis of illumination levels and conditions in working and living areas on board anoffshore installation shall be prepared during the design phase. The illumination shall be analysed especiallyin the control room, cabins and other rooms where work with high visual demands takes place, where displayscreen equipment is used and where the work requires good visibility during various weather conditions.

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1.4.2 A maintenance factor for lighting calculations shall be used. For the maintenance factor reference isgiven to CIE EN 12464-1.

1.5 Application of the limitsThe level of illumination listed in Table 1 refers to the room/area and applies 0.75 m above deck in theworking and living areas. In corridors and in staircases the illumination limit refers to the floor level. Ofpractical reasons the control measurements may be carried out at a height in the range 0 – 0.20 m above thedeck/steps.

1.6 Task lightingIn rooms with obvious task areas like desks in offices and work bench in workshops, the illumination in thetask areas shall have extra, possibly manually operated, lights which may increase the illumination in thetask area at least one step up in the preferred scale of illumination as presented in standard EN-12464-1(Paragraph 4.3.2). For guides to the illumination of task areas in general, reference is given to the standardEN-12464-1.The same applies to workplaces in working areas that require daily access and/or detailed reading ofinformation, or is critical from a safety point of view. This includes gauges, indicators, areas that need to bechecked for leakage and areas that frequently need maintenance.Summed up, task lighting shall be increased as indicated in EN-12464-1 in areas where:

— visual work is critical— errors are costly to rectify— accuracy or higher productivity is of great importance— the visual capacity of the worker is below normal— visual task details are of unusually small size or low contrast— the visual task goes on for an unusually long time.

General task lighting values are given in Table 1.

1.7 DesignThe lighting design shall focus on:

— Avoiding shadows— Avoiding direct glare

1.8 Areas not coveredThe level of illumination and correlated colour temperature on the Navigation Bridge and similar applicableareas with charts and instruments with significant for the maritime activities are not covered by thisstandard, but shall be according to relevant requirements/guidelines from IMO, SOLAS, etc.

1.9 LED lightsLED lights are becoming more and more popular. The objective with this standard is to ensure proper lightingon board, and shall be in line with the specifications given in Table 1. However, well documented deviationswill be accepted for some cases where LED lights are used. This because LED lights tends to have lower Lux-values for the same perceived illumination level compared to conventional lighting.

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2 Measurements of the lighting

2.1 Measurements

2.1.1 The measurements of the illumination shall be carried out according to the procedures described inDIN 5035-5:2006-1. When the procedure de-scribed in DIN 5035-5:2006-11 deviates from any requirementsor procedure mentioned in this standard, the requirements in this standard take precedence.

2.1.2 Lighting parameters subject to verification through measurements are:

— Illumination— Illumination uniformity.

2.1.3 The instrumentation to be used for the light measurements shall comply with DIN 5032-7 class Brequirements or similar standards.

2.2 Test program, -location and number of measurements

2.2.1 A test program shall be approved prior to the measurements. The test program shall at least includethe following information:

— Specification of measuring locations (rooms, areas)— An estimation of number of measurement locations within each room/area, i.e. measurement grid

definition— The lighting during the tests— Instrumentation to be used.

Guidance note:

A guide to the number of measurement locations (grid) evenly distributed in each room/area (including task areas) for generallighting is as given in Table 2 and Table 3 below:

Table 2 Number of measurement positions within the room/area as a function of room size

Location area Number of measurement locations

<15 m2 4

15 < area (in m2) < 150m2

>150 m2 16

Table 3 Selection of measurement positions within the various rooms/areas

Type of room/area Distance between measurements

Corridors <10m

General Process and Utility AreasTo be decided on site, but focus shall be given to marked walkwaysand task areas


2.2.2 For cabins with equal design minimum one cabin of each design shall be measured.

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2.2.3 A separate reading shall be taken at the centre or most important location of each task area.

2.3 Measurements

2.3.1 In general, the measuring positions shall be selected to give a representative description of the lightingconditions on board the offshore facility. The following may be stated:

— Higher density of measuring positions may be required in light sensitive areas and in areas with tasklighting.

— Light measurements shall be conducted both for the general lighting as well as for the task areas.

2.3.2 Other details regarding measurement procedure shall be prepared and carried out in accordance withDIN 5034-5 and DIN 5035-6 standards, depending on primary light source type.

2.3.3 The light measurements shall be taken at the following heights:

— General lighting – 0.75m above the deck— Task area lighting – at task surface height— Corridors/staircase – preferably at deck level or at least not higher than 0.20 m.

2.3.4 The light readings shall be taken in the horizontal plane with the sensor facing upwards.

3 Test conditions

3.1 Light measurements

3.1.1 The light measurements shall be performed during normal lighting condition on board the offshoreinstallation without contributions from stray lights. All major components/furniture shall be in place at thetime of the control measurements.

3.1.2 The measurements shall be carried out with all lighting appliances in operation and in accordance withDIN 5035-5:2006-11.

3.2 Stray lightUnintentional stray light shall be avoided during the measurements. This may be obtained by utilizing thebelow listed measures:

— Sunlight may be avoided by measurements during night times— Light from ship yards/onshore plants shall be avoided in the case of testing during night time if the

installation is still at the yard— Doors between rooms which normally are closed, shall be shut.

3.3 Light from adjacent areasLight transmitted through openings or glass fields in internal partitions are not considered as unintentionalstray light. Hence, light through internal glass walls/windows from the adjacent rooms are considered a partof the design and shall be included in the light measurements.

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SECTION 5 INDOOR CLIMATE

1 Requirements for the on board climate

1.1 Introduction

1.1.1 This standard for the indoor climate outline standards, conventions, guidelines and specifications forthe purpose of categorization of the on board climate for an offshore facility in relation to the performance ofthe on board heat, ventilation, and air conditioning (HVAC) plant at the typical ambient climatic conditions towhich the offshore unit will be subjected during its intended use.

1.1.2 This standard applies only to the indoor occupancy zone as specified in Table 1. Open areas and inhazardous process rooms/areas the requirement to air change and ventilation are commanded by safetyrequirements.

1.1.3 When setting the limits to the climate parameters, and determining the measuring procedure, dueconsideration has been given to technical and practical limitations inherent in the design and construction ofdifferent types of offshore facilities and localities.

1.1.4 This standard gives requirements for indoor climate related to comfort and working environment onboard an offshore facility. The requirements apply to the spaces specified in Table 1.

1.1.5 With the specified climate comfort for the rooms, the majority of the offshore crew can safely andcomfortably perform the necessary activities over a prolonged period of time, for which the room is intendedfor. The design shall ensure that each individual room achieves an adequate indoor climate with respect to airquality, air demand, draught and temperature.

1.1.6 Compliance with the requirements shall be verified through documentation and measurements.

1.2 Classification of spaces on board

1.2.1 The standard applies to the designated accommodation spaces and working areas sensitive to theclimate on board the offshore facility classified as shown in Table 1.

Table 1 Classification of accommodation spaces & comfort sensitive areas outside LQ

Room class Accommodation space

Type A Cabins

Type B Hospital and ward rooms

Type C Central control room, offices, conference rooms, libraries, recreation rooms

Type D Dining areas, gymnasiums, auditorium, cinema

Type E Workshops, laboratories, offices in working areas, local control rooms, coffee bars outside LQ

Guidance note:

Piping and equipment for drilling and drilling related auxiliary systems are addressed in DNVGL-OS-E101.

Piping and equipment for hydrocarbon production and production related auxiliary systems are addressed in DNVGL-OS-E201.


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1.2.2 In each designated space it shall be possible to change from the lower to the higher temperature asgiven in Table 2 within two hours. However for special areas, this temperature control span time criterionmay be evaluated separately.

1.3 Limit valuesThe requirements to air properties and quality at different localities and comfort standard are shown in Table2.

Table 2 Air properties and quality at different localities and comfort standard

Comfortrating

number

Minimum air temperaturecontrol span 1)

Designatedspace type

crn 15°C andbelow (outside)

40°C andabove (outside)

Maximumair

velocity

Minimum fresh airsupply quantity

per person2)

Vertical airtemperaturedifference

4)

Relativehumidity-RH 3)

Min./Max.limit (°C)

Min./Max.limit (°C)

m/s litres/s m3/hour °C %

A12

3

18 to 2419.5 to 24

21 to 24

22 to 2823.5 to 28

25 to 28

0.150.25

0.35

105)

9

8

36.05)

32.4

28.8

2.02.5

3.0

30 to 6020 to 60

< 65

B12

3

18 to 2419.5 to 24

21 to 24

22 to 2823.5 to 28

25 to 28

0.150.25

0.35

125)

10

8

36.05)

32.4

28.8

2.02.5

3.0

30 to 6020 to 60

< 65

C12

3

20 to 2421 to 24

22 to 24

23 to 2824 to 28

25 to 28

0.150.25

0.35

105)

9

8

36.05)

32.4

28.8

2.03.0

3.5

30 to 6020 to 60

< 65

D12

3

20 to 2421 to 24

22 to 24

23 to 2824 to 28

25 to 28

0.150.25

0.35

105)

9

8

36.05)

32.4

28.8

2.03.0

3.5

30 to 6020 to 60

< 65

E12

3

20 to 2421 to 24

22 to 24

24 to 2825 to 28

26 to 28

0.150.25

0.35

105)

9

8

36.05)

32.4

28.8

2.53.5

4.0

30 to 6020 to 60

< 65

1) For outside temperatures between 15°C and 40°C, the control span is to comply with the graphs shown in Figure 1,Figure 2 and Figure 3.

2) Unless otherwise specified by owner and yard the number of persons in each designated space will be countedaccording to ISO 7547.

3) Any relative humidity is to be within the range for all outdoor conditions the HVAC system is designed for.4) Vertical air temperature difference is normally tested for the low temperature condition only5) For NORSOK a minimum air supply of 7 l/s per person plus 2.0 l/s per m2 of the room is indicated. However, this

shall be evaluated in each case.

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Figure 1 Temperature control span, designated space type A and B

Figure 2 Temperature control span, designated space type C and D

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Figure 3 Temperature control span, designated space type E

1.4 Required regulation

1.4.1 For crn 1: Individual and automatic room temperature control (with thermostat) of all the fivedesignated spaces types A, B, C, D & E) are required.For crn 2 and 3: Individual room temperature control of designated all the five designated spaces types A, B,C, D & E) are required.

1.4.2 Air inlets shall be located in the open air and in areas not contaminated by exhaust outlets.

1.5 NORSOK ComplianceFor compliance to NORSOK S-002:

— Recycling of air shall preferably be avoided— Materials containing synthetic mineral fibres that are used in the living quarters or in permanently manned

areas shall be fully sealed— Areas where smoking is allowed shall be separated from non-smoking areas by a physical partition or an

equally effective ventilation control— Carpeted floor shall be avoided.

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2 Measurements of the relevant air properties and qualities

2.1 Simplification of the documentationIn general it may be difficult to achieve the variation in outdoor environment climate for which the HVACis designed. Documentation showing the relation between outside temperature and the actual effect oncooling/heating unit has to be provided. This documentation may be given as a diagram showing requiredtotal cooling/heating effect as function of the outside temperature and humidity. The scope of the test maytherefore be reduced to measurements during one outdoor condition. For the outdoor condition e.g. at thetime of the sea trial/test period it shall be demonstrated that the capacity and general function of the HVACplant can sustain a controlled climate on board according to the selected comfort rating number (crn).

2.2 Parameters to be verified by measurements

2.2.1 The measurements of the indoor climate properties shall be carried out according to the proceduresdescribed in NS-EN ISO 7726:2001. When the procedure described in NS-EN ISO 7726:2001 deviatesfrom any requirements or procedure mentioned in this standard, the requirements in this standard takeprecedence.

2.2.2 Climate parameters subject to verification through measurements are:

— Vertical air temperature difference— Air temperature control span— Maximum air velocity.

2.2.3 The instrumentation to be used for the climate measurements shall be according to NS-EN ISO7726:2001.

2.3 Test program

2.3.1 A test program shall be approved prior to the measurements. The test program shall at least includethe following information:

— Specification of measuring locations— Required operating conditions for the installation and machinery on board— Instrumentation to be used and associated calibration certificates.

2.3.2 The number and location of the measuring positions shall be approved prior survey.

2.4 Measurement guidelinesThe individual values of the climate parameters as listed below shall be verified by measurements duringnormal operation. The HVAC plant shall be operated with constant output temperature during testing.

— Air supply quantity: The air quantity supplied to a designated space shall be measured according toguidelines issued by the CIBSE Commissioning code, series A, air distribution systems, or any equivalentapproved standard. Documentation of measurements shall be submitted for information.

— Air temperature span: The air temperature in a designated space shall be measured at the geometricalcentre of the location. For larger spaces the temperature shall be measured in a representative number ofpositions in the occupancy zone.

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— In order to obtain the temperature control span in each location, the measurement shall be carried out for

the following two conditions with constant setting on the relevant HVAC unit:

— Minimum setting on local temperature regulation— Maximum setting on local temperature regulation.

— The measurement shall be carried out at steady state conditions. The higher temperature of thetemperature control span shall be measured within 2 hours after lower temperature.

— Vertical air temperature difference: The vertical temperature difference in all designated spaces shall bemeasured in the geometric centre of the occupancy zone at the following distances above the floor: 0.2m, 1.0 m and 1.8 m. For larger spaces measurements shall be taken in representative positions. Thepositions shall reflect the temperature at ankle, abdomen and head level.

— Air velocity: The mean air velocity is to be measured at the geometric centre of the room. Alterations ofthe measurement at the most commonly occupied position in the room in question may be requested.

Minor deviations from the specified values in Table 2 may be acceptable in special cases determined by thekind of offshore facility and the waters for which the facility is constructed.

2.5 Measurement standardThe indoor climate measurements shall be carried out according to NS-EN ISO 7726:2001 class Crequirements.

2.6 Test locations in the accommodation

2.6.1 For installations with less than 100 cabins a full set of measurements applicable to climate parametersin Table 2 shall be taken in the following minimum number of cabins (n=number of cabins):

— For n < 10 Measurements in all cabins— For 10 ≤ n ≤ 40 Measurements in min. 10 cabins— For n ≥ 41 Measurements in min. 25% of all cabins.

2.6.2 The cabins to be measured shall be evenly distributed amongst the cabins on each deck. The positionsshall include start and end of duct line, if relevant.

2.6.3 For installations with more than 100 cabins a full set of measurements shall be taken in minimum 10%of the cabins on each deck. The cabins to be measured shall be evenly distributed amongst the cabins oneach deck.

2.6.4 The climate parameters shall be measured in a representative number of public spaces. The measuringpositions shall be selected such as to give a representative description of the climate in the public spaces onboard the installation.

2.6.5 The measurement positions may be subject to alterations during the testing based on the actualfindings during the survey on board the installation.

2.7 Test locations in workspacesThe climate parameters shall be measured in relevant positions is workshops, laboratories, local controlrooms and other sensitive enclosed rooms outside the accommodation areas.The measurement positions may be subject to alterations during the testing based on the actual findingsduring the survey on board the installation.

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3 Test conditionsMeasurements shall be performed with all HVAC systems in normal balanced operation.Prior to the measurements the HVAC system shall be regulated and tested with respect to air flow. This HVACregulation is assumed to be the responsibility of the HVAC discipline (ref. 5.2.4 air supply quantity).The HVAC system shall be adjustable in order to measure the temperature span and allow for all othersituations described in the official measurement program.

4 System requirements

4.1 Redundancy

4.1.1 In case of system failure, the HVAC system shall, depending on the comfort rating number to beachieved, have a redundancy in designated spaces given in 5.4.2.

4.1.2 In order to achieve the designated comfort rating number (crn), the maintainability of the system shallfulfil certain minimum requirements stated in 5.4.3.

4.2 System failure

4.2.1 In case of system failure, a controlled climate in spaces of the Type A and B shall be restored aftermaximum 12 hours for comfort rating crn 1 and 2. If different failures not related to each other occursimultaneously, the required restoring time shall be increased by 12 hours.

4.2.2 The minimum required amount of spare parts to be available shall be agreed between the owner andthe supplier.

4.2.3 For all comfort rating numbers, a minimum level of ventilation in hospitals and control rooms shallbe provided during a system failure by means of separate forced ventilation. Regulation of the fans is to belocated in the respective rooms. This ventilation shall keep the temperature below 35°C and above 15°C.

4.3 Maintenance

4.3.1 In order to guarantee a sustainable crn 1, 2 and 3 climate a degree of system maintainability isrequired.

4.3.2 Ducts, central air handling units, air filters, dust collectors, heat exchangers, re-heaters and airterminals shall be possible to inspect, clean or replace at regular work intervals.

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4.4 FiltersAir filters in air handling units or fan-coil units supplying air to designated spaces shall have minimumfiltration efficiency* according to the European or US filter standards as listed in Table 3.

Table 3 Filter requirements

Space crn Filter

A, B, C, D, E 1 EU7/F7

A, B, C 2, 3 EU7/F7

D, E 2, 3 EU5/F45

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CHAPTER 3 CLASSIFICATION AND CERTIFICATION

SECTION 1 GENERAL REQUIREMENTS

1 Introduction

1.1 GeneralAs well as representing DNV GL’s recommendations on safe engineering practice for general use bythe offshore industry, the offshore standards also provide the technical basis for DNV GL classification,certification and verification services.

1.2 ObjectiveThis chapter identifies the specific documentation, certification and surveying requirements to be appliedwhen using this standard for certification and classification purposes.

1.3 Applicable rulesA complete description of principles, procedures, applicable class notations and technical basis for offshoreclassification is given by the rules for classification of offshore units (rules for offshore units), see Table 1.

Table 1 Rules for offshore units

Document code Title

DNVGL-RU-OU-0101 Offshore drilling and support units

DNVGL-RU-OU-0102 Floating production, storage and loading units

DNVGL-RU-OU-0103 Floating LNG/LPG production, storage and loading units

DNVGL-RU-OU-0104 Self-elevating units

2 Application

2.1 Deviations and exceptionsAny deviations, exceptions and modifications to the design codes and standards given as recognizedreference codes shall be documented and approved by DNV GL.

2.2 Alternative solutionsDNV GL may accept alternative solutions found to represent an overall safety level equivalent to that statedin the requirements of this standard.

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2.3 Execution

2.3.1 Aspects of the design and construction provisions of this standard (Ch.2) which shall be speciallyconsidered, agreed upon, or may be accepted are subject to DNV GL approval when the standard is used forclassification purposes.

2.3.2 All measurements as listed in Ch.2 should be carried out by DNV GL or a 3rd party company pre-approved by DNV GL, and under supervision by a DNV GL representative on board during the measurements.

2.3.3 Depending on the actual situation on board, the attending surveyor may choose to move testpositions/items and expand the number of measurement positions in critical areas. If any locations outsidethe predefined measurement positions are identified with high or excessive noise and/or vibration levels,these positions shall be measured and included in the measurement report.

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SECTION 2 CLASSIFICATION

1 IntroductionThis section discusses the following aspects of classification:

— Class notations and qualifiers— Documentation requirements— In-service follow up.

2 Class notation and qualifiers

2.1 General

2.1.1 Requirements as covered by classification are governed by class notations. A complete description ofthese and their related scope can be found in the above listed Rules for offshore units.

2.1.2 Units complying with the normative levels as described in Ch.2 may be given the notation COMF-MOU with a qualifier designating the comfort rating number (crn) followed, e.g. COMF-MOU(1) indicatescompliance with comfort rating number 1.

2.2 Compliance with NORSOKCOMF-MOU(N) notation documents compliance with NORSOK S-002.Units with this notation shall comply to the crn level 1 and the additional requirements listed in Ch.2 relatedto NORSOK S-002.For further descriptions of the application of COMF-MOU(N) and other (N) notations, see DNVGL-SI-0166.

2.3 OverviewTable 1 provides an overview of the different notations.

Table 1 Overview of COMF-MOU and various qualifiers

Objective Class notation Remarks

COMF-MOU(N) Documents compliance withNORSOK S-002Highest level of comfort

COMF-MOU (1)

Intermediate level of comfort COMF-MOU (2)

Acceptable level of comfort COMF-MOU (3)Documents compliance withIMO/MSC and ISO whereapplicable

3 Information and documentation

3.1 DocumentationDocumentation for classification shall be project specific and in accordance with the NPS DocReq (DNVGLNauticus Production System for documentation requirements).

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A general overview of the relevant documentation is presented in the Table 2 below. It should be noted thatsome of the listed test reports may be integrated.

Table 2 Documentation requirements

Object Documentationtype Additional description Info 1) Qualifiers

All items- Noise/Acoustics

- Vibrations

- Illumination

- Indoor climate

Test procedure

Presents a plan prior to the execution of the tests forhow and where to perform measurements with thepurpose to document the actual situation regardingnoise/acoustics, vibrations, illumination and indoorclimate.The operating and loading condition during themeasurements must be specified where applicable.

These test programs have to be accepted by the classSociety before the actual tests are carried out

AP

Noise study

Presents the expected noise levels on board in all areasduring normal operating condition of the facilityMust include the selected building materials and methodsalong with the building acoustic properties and theexpected result

FI crn 1+2

Noisemeasurementssurvey report

Documents the resulting noise levels on board in allareas during normal operating condition of the facilityMay be carried out during the commissioning, at the seatrial and/or during normal operating condition

AP All

Personnel noiseexposure study

Documents the resulting noise exposure for thepersonnel on board.Measured noise levels during the commissioningcombined with the manning plan

AP crn 1+2

Sound insulationmeasurementreport

Documents the resulting sound insulation betweenselected rooms, i.e. rooms as identified in the testprocedure.Must include descriptions and specification of the testedpartitions along with the field measured test results onboard.

AP crn 1+2

Noise /Acoustics

Sound absorptionmeasurementreport

Documents the resulting sound absorption propertiesin selected areas, i.e. rooms as identified in the testprocedure.Must include an acoustical description of the rooms alongwith the field measured test results.

AP crn 1

Vibration studyGlobal vibrations

Presents the expected natural frequencies in hull/girderson board in all relevant areas during normal operatingcondition of the facility

FI crn 1+2

Vibration

Vibration studyLocal vibrations

Presents the expected natural frequencies in deck fieldsclose to major machinery and in vibration sensitiveareas.Recommendations in order to avoid resonant conditionsshould have been given.

FI crn 1+2

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Object Documentationtype Additional description Info 1) Qualifiers

VibrationVibrationmeasurementsSurvey report

Documents the resulting vibrations on board in allrelevant areas during normal operating condition of thefacilityThese measurements may be carried out during thecommissioning, at the sea trial and/or combined withmeasurements after start-up offshore.

AP All

Light studyPresents the lighting philosophy with respect to typeof lighting and distribution as well as the expectedillumination in various areas

AP crn 1

IlluminationLightmeasurementsurvey report

Documents the resulting illumination on board in allrelevant areas with normal lighting condition of thefacility. Stray light and unwanted lighting are blocked.These measurements may be carried out duringcommissioning at the yard, offshore or at the sea trial ifany.

AP crn 1+2

HVAC study

Presents the specifications for the HVAC system alongwith heat balance and air flow calculations.The HVAC studies should also include a HVAC noiseprediction

FI All

HVAC air flowmeasurementreport

Presents the measured air flows in the system during/after the air flow adjustments have been executed.Based on these measurements the air supply per personmay be calculated and compared with the requirements.

FI AllIndoor climate

HVACmeasurementsurvey report

Documents the resulting temperature control span, airvelocity and vertical temperature difference for relevantareas on board the offshore facility.These measurements may be carried out during thecommissioning at the yard, at the sea trial if any and/orcombined with measurements after start-up offshore.

AP All

Note:

1) AP: For AProval by the Society

FI: For Information

3.2 Content requirementsAll studies shall contain the following information:

— identification of the offshore facility— identification and specification of the relevant equipment/machinery— identity and description of the spaces— name of engineer/organisation— date and time of the analysis— details of the analysing tools— necessary assumptions of significance to the analysis

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All measurement reports shall contain the following information:

— identification of the offshore facility— identification and specification of the relevant equipment/machinery— identity and description of the spaces— name of surveyor/organisation— location, date and time of the measurements— details of type and make of instruments used— instrument calibration data— details of the measured parameters and units— operating conditions of relevant equipment/machinery— environmental conditions of significance to the results

4 In-service requirements

4.1 Alterations and modifications

4.1.1 If approved arrangements, equipment or procedures are altered, up dated documentation shall beresubmitted for approval.

4.1.2 The compliance with this standard must be demonstrated by measurements after any significantmodifications on board the installation in the following situations:

— When changes have been made for the process itself— When some of the equipment with impact of the working environment on board is modified

4.2 Documentation storageThe environmental performance of systems covered by this standard shall be verified by inspection andmeasurements in accordance with the requirements of this standard and in compliance with identifiedstandards and guidelines. Data shall be gathered and kept on board in appropriate logbooks for review duringperiodical surveys if applicable as defined in the applicable Offshore Service Specification.

4.3 RenewalThe COMF-MOU notation must be renewed each 5 year. The renewal shall be based on measurementsurveys according to predefined programs.

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SECTION 3 MEASUREMENT EQUIPMENT

1 CertificationThe measurement equipment used for demonstrating the compliance with the limits shall be certified or type-approved. The measurement equipment shall have acceptable calibration certificates. Where applicable, themeasurement equipment shall be calibrated by use of a mobile and easy to use calibrator with its own validcalibration certificate.

Table 1 Certificate requirements

Object Certificate type Additional description Qualifiers

Noise level meter/acoustic equipment Calibration certificate Type 1 All

Vibration measurement equipment Calibration certificate To be decided All

Light measurement equipment Calibration certificate To be decided All

Thermo- and air draught measurementequipment Calibration certificate To be decided All

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HISTORIC CHANGESThere are currently no historical changes for this document.

DNV GLDriven by our purpose of safeguarding life, property and the environment, DNV GL enablesorganizations to advance the safety and sustainability of their business. We provide classification andtechnical assurance along with software and independent expert advisory services to the maritime,oil and gas, and energy industries. We also provide certification services to customers across a widerange of industries. Operating in more than 100 countries, our 16 000 professionals are dedicated tohelping our customers make the world safer, smarter and greener.

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