DNVGL-RP-E401 Recommendation for selecting...

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RECOMMENDED PRACTICE

DNVGL-RP-E401 Edition June 2016

Recommendation for selecting standardsfor piping components (tentativerecommended practice)

FOREWORD

DNV GL recommended practices contain sound engineering practice and guidance.

© DNV GL AS June 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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Recommended practice — DNVGL-RP-E401. Edition June 2016 Page 3Recommendation for selecting standards for piping components (tentative recommended practice)

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CHANGES – CURRENT

This is a new document.

This is a tentative edition of a DNV GL recommended practice. Tentative editions apply to new servicedocuments to which DNV GL reserves the right to make adjustments during a period of time to obtain theintended purpose.

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AcknowledgementThis recommended practice is one of a series resulting from a Joint Industry Project (JIP) led by DNV GLto reduce cost and increase predictability without compromising quality and safety in international offshoredevelopment projects by recommending standardized parameters for selected items. The partners of theJIP were Hyundai Heavy Industries (HHI), Daewoo Shipbuilding and Marine Engineering Company (DSME),Samsung Heavy Industries (SHI), Korea Offshore and Shipbuilding Association (KOSHIPA) and the KoreaMarine Equipment Research Institute (KOMERI).The present series of recommended practices also include:

— Recommendation for selecting standards for structural steel materials— Recommendation for selecting standards for electrical and instrumentation components— Recommendation for selecting standards for steel bulk items.

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CONTENTS

Changes – current.................................................................................................. 3Acknowledgement...................................................................................4

Section 1 Introduction............................................................................................ 71.1 General............................................................................................. 71.2 Objective...........................................................................................71.3 Applicability...................................................................................... 71.4 Scope................................................................................................ 7

1.4.1 Ball valves.................................................................................... 71.4.2 Piping insulation............................................................................ 71.4.3 Welded and clamped shoes............................................................. 8

1.5 References – informative..................................................................91.6 Definitions.........................................................................................9

1.6.1 Abbreviations.................................................................................91.6.2 Verbal forms................................................................................101.6.3 Insertion loss-acoustic.................................................................. 10

Section 2 Summary of standards, key parameters and requirements....................112.1 Ball valves...................................................................................... 11

2.1.1 General.......................................................................................112.1.2 Non-destructive test for casting..................................................... 122.1.3 Pressure test............................................................................... 122.1.4 Fugitive emission test...................................................................122.1.5 Non-metallic material test............................................................. 132.1.6 Material certificate requirements.................................................... 132.1.7 Gear operator.............................................................................. 13

2.2 Piping insulation............................................................................. 132.3 Welded and clamped shoes............................................................ 14

Section 3 Evaluation..............................................................................................153.1 Ball valves...................................................................................... 15

3.1.1 General.......................................................................................153.1.2 Non-destructive test..................................................................... 153.1.3 Pressure test............................................................................... 153.1.4 Fugitive emission test...................................................................163.1.5 Material certificates...................................................................... 163.1.6 Gear operator application..............................................................16

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3.2 Piping insulation............................................................................. 163.3 Welded and clamped shoes............................................................ 16

Section 4 Recommended requirements................................................................. 184.1 Ball valves...................................................................................... 18

4.1.1 General.......................................................................................184.1.2 Non-destructive test for casting..................................................... 184.1.3 Pressure test............................................................................... 184.1.4 Non-metallic material test O-ring................................................... 184.1.5 Material certificates...................................................................... 184.1.6 Gear operator.............................................................................. 18

4.2 Piping insulation............................................................................. 194.2.1 General.......................................................................................194.2.2 Insulation Class 1 – heat conservation............................................194.2.3 Insulation Class 2 – cold medium conservation................................ 204.2.4 Insulation Class 3 – personnel protection........................................ 204.2.5 Insulation Class 4 – frost protection............................................... 204.2.6 Insulation Class 5 – fire protection.................................................214.2.7 Insulation Class 6 – acoustic insulation Class A................................214.2.8 Insulation Class 7 – acoustic insulation Class B................................214.2.9 Insulation Class 8 – acoustic insulation Class C................................224.2.10 Insulation Class 9 – external condensation and icing protection........ 22

4.3 Welded and clamped shoes............................................................ 234.3.1 Welded shoe................................................................................234.3.2 Clamped shoe..............................................................................25

Appendix A Ball valve requirements..................................................................... 27

Appendix B NORSOK versus recommended requirements.....................................30

Changes - historic.................................................................................................46


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SECTION 1 INTRODUCTION

1.1 GeneralThe joint industry effort followed an aligned development approach, which consisted of three distinguishedand iterative process steps as follows:

— define items to be included in the scope— identify relevant standards and regulations— define requirements and formulate recommendations.

The first step defined potential standardization areas in more detail, e.g. intended function of the item, itsoperational context and possible parameters to be standardized. In the second step the relevant internationalstandards and regulations for the selected items were identified and structured. Differences betweenstandards and regulations were identified as a basis for defining standardized requirements and developingrecommendations.This recommended practice (RP) is the direct outcome of the third and last step defining requirementsand formulating recommendations. It aims to reduce the number and variations in requirements to theminimum necessary to reflect a common and global best practice based upon the standards and regulationsidentified in second step. A risk based approach has been used when defining the proposed requirements andrecommendations.

1.2 ObjectiveThe objective of this RP for selection of standards for piping components is to provide a uniform referencefor design and fabrication of ball valves, piping insulation, welded and clamp shoes in piping systems. Thisstandardization in the selection and use of standards is expected to result in significant cost and schedulesavings.

1.3 ApplicabilityThis RP covers offshore oil and gas projects involving topsides equipment on any type of productioninstallation, fixed or floating, and drilling unit. The RP should not be applied for systems covered by classrules.

1.4 Scope

1.4.1 Ball valvesThis RP specifies the recommended requirements for ball valves in piping systems with a size range of ½” to24” and pressure ratings from ASME Class 150 to 2500. It does not cover subsea valves, instrument valvesin tubing, actuator operated valves and control valves. Application in artic environment is excluded from thisspecification. No other geographical limitations apply.The primary standard for valves in piping systems is API 6D and this present RP does not aim to replace API6D. All recommended requirements are intended to be consistent with API 6D. Moreover this RP specifiesadditional requirements in order to reduce variations in valve specifications in offshore oil and gas projects.This RP covers parameters related to ball valve design, material and testing as well as other valve detailssuch as requirements to forging, anti-static device, blow-out proof stem and locking device.

1.4.2 Piping insulationThe current edition of this RP specifies the recommended requirements for piping insulation for offshoreassets operated on the Norwegian Continental Shelf (NCS).


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For piping insulation on the NCS, NORSOK R-004 is recognized as the industrial standard. It categorizes thepiping insulation based on its purpose in nine (9) different insulation classes. NORSOK R-004 requirementsaddress several aspects and parameters of the piping insulation, e.g. insulation material, jacketingmaterial, qualification of personnel, pipe penetrations and inspection and test. This RP covers the proposedrequirements for the insulation material. The range of nominal pipe sizes covered in this RP range from 2” to36”.

1.4.3 Welded and clamped shoesNo geographical limitations apply for the recommended requirements to welded and clamped shoes.This RP specifies the recommended requirements for shoes and clamps. A pipe shoe is a structure consistingof a saddle and integral base that is used to support the pipe by transmitting the load or forces to theadjacent structure. It can be divided into welded shoe and clamped shoe. Pipe clamp is installed to attachpipe to shoe structural members. Examples of pipe and shoes arrangements and components are shown inFigure 1-1.

Figure 1-1 Examples of pipe and shoes arrangements and components


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1.5 References – informativeThe documents listed in Table 1-1, in whole or in part, are normally referenced in this document and areindispensable for its application. For dated references, only the edition cited applies. For undated references,the latest edition of the referenced document including any amendments applies.

Table 1-1 References

API 6D Specification for pipeline

ISO 14313:2007 Petroleum and natural gas industries — Pipeline transportation systems — Pipelinevalves

ASME B16.10 Face-to-Face and End-to-End Dimensions of Valves

NORSOK M-710 Qualification of non-metallic materials and manufacturers – Polymers

NACE TM 0297 Effects of High-Temperature, High-Pressure Carbon Dioxide Decompression onElastomeric Materials

ISO 23936-2:2011 Petroleum, petrochemical and natural gas industries -- Non-metallic materials incontact with media related to oil and gas production -- Part 2: Elastomers

EN 10204:2004 Metallic Products – Types of inspection documents

ANSI/ NACE MR0175/ISO 15156 Materials for use in H2S-containing Environments in Oil and Gas Production

ASME B16.34 Valves – Flanged, Threaded, and Welding End

ISO 15848-2:2015 Industrial valves -- Measurement, test and qualification procedures for fugitiveemissions -- Part 2: Production acceptance test of valves

NORSOK R-004 Piping and equipment insulation

IS0 12241 Thermal insulation for building equipment and industrial installations – Calculationrules

ISO 15665 Acoustics -Acoustic insulation for pipes, valves and flanges

ASME B31.3 Process Piping

NORSOK L-002 Piping system layout, design and structural analysis

1.6 Definitions

1.6.1 AbbreviationsTable 1-2 Abbreviations

Abbreviation Full text

API American Petroleum Institute

ASME American Society of Mechanical Engineers

ASTM American Society for Testing and Materials

FEED Front end engineering design


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Abbreviation Full text

FEF Flexible elastomeric foam

GRE Glass fibre reinforced epoxy

ISO International Organization for Standardization

MT Magnetic test

NACE National Association of Corrosion Engineers

NCS Norwegian continental shelf

NDT Non-destructive testing

NORSOK Norsk Sokkels Konkuranseposisjon (Developed by the Norwegian petroleum industry)

PUF Poly urethane foam

SPE Single position effect

S/S Stainless steel

TAC Type approval certificate

1.6.2 Verbal formsTable 1-3 Verbal forms

Term Definition

shall verbal form used to indicate requirements strictly to be followed in order to conform to the standard andfrom which no deviation is permitted, unless accepted by all involved parties

should verbal form used to indicate that among several possibilities one is recommended as particularly suitable,without mentioning or excluding others, or that a certain course of action is preferred but not necessarilyrequired

may verbal form used to indicate a course of action permissible within the limits of the standard

1.6.3 Insertion loss-acousticLoss of signal power resulting from the insertion of a device or element in a transmission line and is usuallyexpressed in decibels (dB).For example, a minimum insertion loss 9 dB means that noise taking place inside the pipe is reduced by 9dB. In case the noise inside the piping is 10 dB, it becomes 1 dB outside the pipe (10-9 = 1 dB).


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SECTION 2 SUMMARY OF STANDARDS, KEY PARAMETERS ANDREQUIREMENTS

2.1 Ball valves

2.1.1 GeneralThe parameters as listed in Table 2-1 were assessed by comparing valve specifications from different offshoreprojects. The assessment confirmed that API 6D is the most widely used standard for ball valves in offshoreprojects.

Table 2-1 Design parameters for ball valve design, material and testing

Parameter group Parameter

Valve design

Body thickness

Pressure and temperature

Min. bore of ball

Valve design

Body type

Non-destructive test

Fire test certificates

Pressure test (hydrostatic shell test and hydrostatic seat test)

Fugitive emission test

Non-metallic material test (O-ring)

Material certificates

NACE MR0175/ /ISO 15156

Hardness

Inspection and test

Impact test

Face to face dimension

Forging

Anti-static device

Blow-out proof stem

Locking device

Gear operator

Wrench and handwheel

Seat design – floating type

Seat design – trunnion type

Valve details

Cavity pressure relief


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Parameter group Parameter

Stem/seat sealant injection

Lifting lug

Name plate

End type

Most ball valve requirements refer to API 6D. There are however additional aspects and parameters whichare not covered by API 6D such as test requirements and material certificates. It should be noted that API 6Dgives guidance on testing requirements providing flexibility and as a result creating unique ball valve testingrequirements for each project.This section provides a high level overview of aspects and parameters covered in this RP, however notcovered in detail by API 6D, as follows:

— NDT for casting— pressure test through hydrostatic shell test and hydrostatic seat test— fugitive emission test— non-metallic material test (O-ring)— gear operator.

It also outlines some alternative standards identified for ball valve specifications in offshore projects.

2.1.2 Non-destructive test for castingThe main purpose of the NDT is to identify interior cracks in the casting. The following recognized industrialstandards refer to or have requirements related to NDT for casting:API 6D (Annex A Supplementary requirement): Referring to ASME B16.34 Appendix I (Radiographyexamination)- Procedure and acceptance standardsNORSOK M-630: All casting shall be examined with MT– ASME VIII Div.1 Appendix 7. Also RT (RadiographicTesting) shall be carried out as per Table 2-2.

Table 2-2 Extent of RT according to NOSOK M-630

Extent of RT based on pipe class and nominal outside diameter:

Piping Class ≤150# 300# 600# 900# 1500# ≥2500#

10 % ≥10” ≥10” ≥2” ≥2” ≥2” ≥2”Extent of RT

100 % Not applicable Not applicable ≥20” ≥16” ≥6” ≥6”

2.1.3 Pressure testThe main purpose of the pressure test is to check that there is no leak through the seat sealing. Therecognized industrial standard for pressure test is API 6D. High pressure gas seat test or hydrostatic seat testdepending on owner requirements is typically applied according to API 6D (Sec.9.4.4.6). However, companyspecific standards are also applied.

2.1.4 Fugitive emission testThe main purpose of the fugitive test is to ensure that there is no leakage from the stem. The recognizedindustrial standard for fugitive emission test is ISO 15848. Fugitive emission test is not common in offshore


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projects. However, in some few cases company standards require fugitive emission test as per the ISOstandard for all ball valves.

2.1.5 Non-metallic material testThe main purpose of the non-metallic test is to ensure that there is no leakage through the O-ringelastomers located inside the ball valve. The recognized industrial standards for non-metallic material testsare:

— NORSOK M-710— NACE TM0297— ISO 23936-2.

2.1.6 Material certificate requirementsThe recognized industrial standard for material certificate types is EN10204.

2.1.7 Gear operatorThere are no recognized industrial standards for selection of gear operator.

2.2 Piping insulationNORSOK R-004 requires the application of cellular glass for satisfactory insulation performance. At the sametime NORSOK allows the use of alternative insulation materials or material combinations, provided that thosesatisfy the functional requirements of NORSOK R-004. It is important to note that such alternative insulationsolutions can vary widely in various aspects, e.g. insulation material, material combination and insulationthickness.When an alternative insulation solution is identified, the technical properties need to be tested by an externalthird party institute or accredited laboratory. The test has to be relevant and in accordance with insulationclasses described in NORSOK R-004.1

NORSOK R-004 categorizes the piping insulation based on the insulation purpose in nine (9) differentInsulation classes as shown in Table 2-3 below.

Table 2-3 Insulation Classes according to NORSOK R-004

Class Insulation

Class 1 Heat conservation

Class 2 Cold medium conservation

Class 3 Personal protection

Class 4 Frost protection

Class 5 Fire protection

Class 6Class 7

Class 8

Acoustic insulation with reference to Clause 4 of ISO 15665 (In terms of minimum insertion loss, Class 6,Class 7 and Class 8 to be in accordance with ISO 15665 Class A, Class B and Class C, respectively)

Class 9 External condensation and icing protection

1 see also Clause 13 in NORSOK R-004


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The main parameters impacting the insulation performance are the insulation material and thickness, whilethe thickness is determined based on the properties of the selected insulation material.

2.3 Welded and clamped shoesThere are no specific requirements for shoes and clamps in international standards, defining the shape, size,dimensions, material or the application area. In the lack of guidance from international standards companystandards from owners and engineering houses have defined different types of shoes and clamps varying inshape, size and dimension.Different materials for shoes and clamps and especially for the gusset and the base plate of the shoes areused for each project. The application requirements vary widely, e.g. use of clamped shoe is limited to GRElines only or in some cases clamped shoe is applied for any other material. As a result each project hasindividual shoe and clamp specifications despite identical purpose making it very difficult to use shoes andclamps across different projects.


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SECTION 3 EVALUATION

3.1 Ball valves

3.1.1 GeneralIn general long delivery time is required for ball valves since a large number and various sizes are typicallyrequired for offshore projects. Table 3-1 shows an example of the quantities of manual ball valves applied fora typical FPSO project.

Table 3-1 Quantities of manual ball valves of FPSO

Item Hull/topside Quantity

Hull 1,689Ball valve (soft seated) DN20 ~ DN150

Topside 6,873

Hull 280Ball valve (soft seated) DN200 ~ DN700

Topside 671

Manual valve

Ball valve (metal seated) DN50 ~ DN300 Topside 233

Unique specifications of ball valves due to company requirements are resulting in low reuse opportunitiesand require both engineering and manufacturer to spend a considerable amount of time to implement uniquerequirements. Fugitive emission test and high pressure gas leak are complex and time consuming and varywith customer requirements.Ball valves are frequently subject to change orders during the process from FEED to detailed design. Changeorders often lead to long delivery times due to manufacturers’/vendors’ limited capacity.Broadly, ball valve specifications consists of 3 (three) parameter groups “General design”, “Inspection/testmethods” and “Valve details”. The parameters addressed in this RP are listed in Sec.2. Each parameterrequirement was assessed by both comparing different offshore projects and comparing each projectspecification to API 6D. The assessment revealed that the main differences among the assessed valvespecifications are related to NDT, pressure test, fugitive emission test, material certificates and gear operatorapplication. In this section those identified parameters are discussed and evaluated to identify a morestandardized practice for offshore projects.

3.1.2 Non-destructive testAPI 6D states that non-destructive testing (NDT) for casting is a supplementary requirement, not consideredmandatory. Nevertheless, many valve specifications require that NDT tests are conducted, often followedby unique test procedures for different offshore projects. The extent of NDT evaluated for different pipingclasses and dimensions was based upon finding a common denominator between the different projects. It isimportant that experience from NDT, e.g. typical failure rates and consequences of failures, are taken intoaccount in order to further evaluate if the proposed NDT extent proposed in this RP is suitable.Standardizing and reducing NDT requirements would decrease procurement cost and delivery time.

3.1.3 Pressure testBased on the projects reviewed, it has been noted that high pressure gas leak test is requested to beapplied to all hydrocarbon phases, including vapour and liquid. According to API 6D this test is required asan alternative to hydro test. It is recommended that the high pressure gas leak test is only applied for ball


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valves handling vapour and mixed phase. High pressure gas leak test is not recommended for ball valveshandling liquid phase only as this test is normally covered by the hydro test.

3.1.4 Fugitive emission testAlthough the fugitive emission test is not required by API 6D, some specifications require certificates per ISO15848-2. The majority of project specifications reviewed do not require the fugitive emission test. Leakagein ball valves comes from impairment of ball valve seat handling fluid under high pressure. If the valve seatdeforms, its sealing properties are impaired and it will leak as a result. The fugitive emission test is carriedout to ensure that there is no emission through the valve stem. Provided that the seat sealing is not leakingthere should be no vapour emission through the valve stem. Emission from the stem requires a leak throughthe seat and a stem leak can therefore be considered as a double barrier failure with a very low probability ofvery low emissions. The safety and environmental benefit of the fugitive emission test is therefore consideredto be relatively low compared to the additional cost of this test and as a result the fugitive emission test isnot recommended in this RP.

3.1.5 Material certificatesMaterial certificates are required for ball valves, generally with reference to EN 10204 Annex A. The typeof the certificate varies depending on the project specifications. Simplifying and standardizing the type ofcertificates for ball valves will lead to lower costs and shorter delivery times.

3.1.6 Gear operator applicationThe design of the gear operator has widely ranging requirements from project to project. The choice ofcriteria for when gear operator is required should include physical and ergonomic field experience which hasnot been assessed as part of the development of this RP. It is important that such experience is assessed andevaluated to revise and update the proposed gear operator requirements included in this RP. A simplificationof the design requirements for the gear operator, e.g. with reference to nominal pipe size, will lead toreduced procurement cost, weight and shorter delivery time.

3.2 Piping insulationIn order to identify the best alternative piping insulation solution, an evaluation has been conducted tocompare several different offshore projects for the NCS. The result of the evaluation shows that aerogel isthe preferred alternative insulation material. The technical properties of aerogel have been tested and foundto be generally relevant and in accordance with insulation classes described in NORSOK R-004.In order to better understand other differences between cellular glass and aerogel as insulation materialfor piping, both materials have been compared in relevant dimensions like procurement costs, engineeringefforts, delivery time and fabrication efforts. The assessment shows that aerogel has advantages over cellularglass in terms of drag force reduction and installation convenience. Wind/blast induced drag forces will bereduced due to reduction in insulation thickness. Installing cellular glass requires more time in order toassemble the large size of pre-formed sections over pipework and fittings, whereas aerogel can be easilyhandled by cutting and wrapping 5 mm and 10 mm insulation blankets over pipework and fittings. The totalmaterial costs for both materials are considered to be similar.

3.3 Welded and clamped shoesIn the lack of common industrial standards for shoes and clamps an assessment has been conducted tocompare applied shoe/clamp designs and application areas in offshore projects. Based on specific projectshoe design examples, a set of recommended requirements have been established and described in Sec.4.The main factors considered in order to arrive at an optimal design of shoes/clamps are load distribution,weight and material cost.


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Pipe shoes can be classified into welded shoe and clamped shoe. Shape, dimension, material and application(welded or clamped) shall be considered as parameters of shoe/clamp. In addition to reduced weight andcost through optimized design there are significant standardization benefits related to standard designrequirements for shoes and clamps such as lower procurement cost, reduced engineering time and reduceddelivery time.


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SECTION 4 RECOMMENDED REQUIREMENTS

4.1 Ball valves

4.1.1 GeneralDetailed information related to standards and requirements including recommended requirements for ballvalves are listed in App.A. In general, ball valve design should be in accordance with API 6D (or ISO 14313)and ASME B16.34. Additional requirements for inspections/tests and design are recommended below.

4.1.2 Non-destructive test for castingCastings should be examined against the acceptance criteria stipulated in section 8 of ASME B 16.34.

Table 4-1 Acceptance criteria

Piping Class RT (or UT) MT

~ 150# 5 %

300# ~ 600# 10 % 10%

900# ~ 2500# 100 % 100%

Acceptance criteria as per ASME B 16.34

4.1.3 Pressure testRequirements should be to follow API 6D with additional high pressure gas seat test for hydrocarbon gas andmixed phase service. Pressure test is recommended not to be a requirement for liquid service.

4.1.4 Non-metallic material test O-ringThe non-metallic material test should be carried out in accordance with one of the following standards forhydrocarbon gas and mixed phase service:

— NORSOK M-710— NACE TM 0297— ISO 23936-2 M.

For liquid service no requirement for non-metallic material test is recommended. If the product is certifiedwith a Type Approval Certificate then no additional tests are required.

4.1.5 Material certificatesType 2.2 Certificate and Type 3.1 Certificate according to EN 10204 are recommended to be applied to non-pressure/non-metallic parts and pressure parts including duplex stainless steel and high alloy materials,respectively.

4.1.6 Gear operatorAll valves require gear, if they exceed the criteria listed in Table 4-2 regardless of floating or trunnionmounted type.


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Table 4-2 Criteria for floating/trunnion mounted type

Piping class Pipe size

150 # 8” and larger





≥ 2500 # 4” and larger

4.2 Piping insulation

4.2.1 GeneralAerogel is recommended as the main insulation material, as per selection B in the tables below for thedifferent insulation classes while other layers should follow NORSOK R-004. Alternative insulation materialchoices are provided as Selection A and C. App.B shows the NORSOK R-004 requirements compared to theproposed requirements in this RP.

4.2.2 Insulation Class 1 – heat conservationThe heat conservation for insulation class 1 is defined in Table 4-3.

Table 4-3 Heat conservation for insulation class 1

Temp.(ºC)

Recommended insulation system- Selection A

Recommended insulationsystem- Selection B

Recommended insulation system- Selection C

~ 90 Cellular Glass + S/S Jacketing Aerogel + S/S Jacketing PUF + Silicone Coated Glass Fibre


~ 180 Cellular Glass + S/S Jacketing Aerogel + S/S Jacketing Calcium Silicate + Silicone CoatedGlass Fibre

~ 230 Mineral Wool + S/S Jacketing Aerogel + S/S Jacketing Calcium Silicate + Silicone CoatedGlass Fibre


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4.2.3 Insulation Class 2 – cold medium conservationThe cold medium conservation for insulation class 2 is defined in Table 4-4.

Table 4-4 Cold medium conservation for insulation class 2

Temp.(ºC)




All Cellular Glass + Vapour Barrier +S/S Jacketing

Aerogel + Vapour Barrier + S/S Jacketing

FEF + Flexible Polymeric Jacketing

4.2.4 Insulation Class 3 – personnel protectionThe personnel protection for insulation class 3 is defined in Table 4-5.

Table 4-5 Personnel protection for insulation class 3

Temp.(ºC)




~ 150 Metal Guard Metal Guard Metal Guard


~ 230 Mineral Wool + S/S Jacketing Aerogel + S/S Jacketing Calcuim Silicate + Silicone CoatedGlass Fibre

~ 280 Mineral Wool + S/S Jacketing Aerogel + S/S Jacketing Calcuim Silicate + Silicone CoatedGlass Fibre

4.2.5 Insulation Class 4 – frost protectionThe frost protection for insulation class 4 is defined in Table 4-6.

Table 4-6 Frost protection for insulation class 4

Temp.(ºC)




~ 150 Metal Guard Metal Guard Metal Guard





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4.2.6 Insulation Class 5 – fire protectionThe fire protection for insulation class 5 is defined in Table 4-7.

Table 4-7 Fire protection for insulation class 5

Temp.(ºC)

Recommendedinsulation system- Selection A


Recommendedinsulation system- Selection C

Recommended insulationsystem- Selection D

All Cellular Glass + AESWool + S/S Jacketing

Aerogel + S/S Jacketing(additional layer ofMicroporous blanketdepending on fire rate)

AES Wool +Microporous Blanket +S/S Jacketing

Cellular Glass + Benarx FCellular Glass XP

4.2.7 Insulation Class 6 – acoustic insulation Class AThe acoustic insulation ISO 15665 Class A for insulation class 6 is defined in Table 4-8.

Table 4-8 Acoustic insulation ISO 15665 Class A for insulation class 6

Temp.(ºC)



Recommended insulationsystem- Selection C

Recommendedinsulation system- Selection D

All Cellular Glass + MineralWool + S/S Jacketing

Aerogel + Heavy SyntheticSheet + S/S Jacketing

PUF + Heavy SyntheticSheet + Silicone CoatedGlass Fibre

FEF + Heavy SyntheticSheet + FlexiblePolymeric Jacketing

4.2.8 Insulation Class 7 – acoustic insulation Class BThe acoustic insulation ISO 15665 Class B for insulation class 7 is defined in Table 4-9.

Table 4-9 Acoustic insulation ISO 15665 Class B for insulation class 7

Temp.(ºC)





All Cellular Glass +Mineral Wool + HeavySynthetic Sheet + S/S Jacketing

Aerogel + Heavy SyntheticSheet + S/S Jacketing

PUF + Heavy SyntheticSheet + Silicone CoatedGlass Fibre

FEF + Heavy SyntheticSheet + FlexiblePolymeric Jacketing


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4.2.9 Insulation Class 8 – acoustic insulation Class CThe acoustic insulation ISO 15665 Class C for insulation class 8 is defined in Table 4-10.

Table 4-10 Acoustic insulation ISO 15665 Class C for insulation class 8

Temp.(ºC)





All Cellular Glass + MineralWool + 2xHeavySynthetic Sheet+ Mineral Wool +2xHeavy SyntheticSheet + S/S Jacketing

Aerogel + Heavy SyntheticSheet + Aerogel +2xHeavy Synthetic Sheet +S/S Jacketing

PUF + Heavy SyntheticSheet + Glass Fibre Mat+ Heavy Synthetic Sheet+ Silicone Coated GlassFibre

2xFEF + 2xHeavySynthetic Sheet +Flexible PolymericJacketing

4.2.10 Insulation Class 9 – external condensation and icing protectionThe external condensation and icing protection for insulation class 9 is defined in Table 4-11.

Table 4-11 External condensation and icing protection for insulation class 9

Temp.(ºC)




0 ~ 20 Cellular Glass + Vapour Barrier +S/S Jacketing

Aerogel + Vapour Barrier +S/S Jacketing


-20 ~ -40 Cellular Glass + Vapour Barrier +S/S Jacketing



-40 ~ -60 Cellular Glass + Vapour Barrier +S/S Jacketing



-60 ~ Cellular Glass + Vapour Barrier +S/S Jacketing




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4.3 Welded and clamped shoes

4.3.1 Welded shoeThe recommended requirements for welded shoes are described in Table 4-12.

Table 4-12 Recommended requirements for welded shoes

Parameter Sub-parameter Recommended requirements

UPTO 6"

For 3" pipes and below gusset is not required. One gusset should be located in themiddle for pipes between 4" and 6”. If the shoe length is more than 600 mm a centregusset should be added.

8" and above

Size/dimension Configuration


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For pipes 8" and above shoe has two gussets located in symmetrical distance in thecenter of the shoe. If the shoe length is more than 600 mm a centre gusset shouldbe added.

Wear pad Wear pads shall be provided for the following conditions:

— Equal to SCH 5S/10S to duplex stainless steel— CrMo SCH 30 and below— CS and LTCS and— If required by stress analysis.

Length andheight

Standard length of shoes should be 300 mm. Standard height should be 100 mm.If other heights and lengths are used then this should be clearly stated in theisometric.

Base platethickness

2" ~ 12": 10 mm14"~: 15 mm

Wear pad Wear pad shall be same material or equivalent to parent pipe.Material

Gusset and ribplate

Application Application Shoe application:

a) All insulated linesb) All uninsulated slope lines 2" and above.

Welded shoe application:

— Welded shoes are required for STOP and ANCHOR.— For Cu-Ni, titanium piping, welded shoe can be used if a welding procedure

specification is prepared.

Inspection andtesting

NDT All welds shall be 100% visually inspected after completion and before any NDT isapplied. The attachment welds between structural components and pressure partsshall be either dye penetrant or magnetic particle examined.


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4.3.2 Clamped shoeThe proposed requirements for clamped shoes are described in Table 4-13.

Table 4-13 Recommended requirements for clamped shoes


Steel/Non-ferrous 1-1/2" – 24" GRE 2-20" 24" and 28"

Shoe should be supported with two gussets located in symmetrical distance in thecentre of the shoe if the shoe length is equal or below 300 mm. In this case, twosets of bolts should be used for clamping.Shoe shall be supported with three gussets located in symmetrical distance in centreof the shoe and one in the centre if the shoe length is above 300 mm. In this case,three sets of bolts should be used for clamping.

GRE line stop

Size/dimension Configuration


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GRE line stop and anchor clamp should consist of one big clamp.

Length andheight

Standard length of shoes should be 300 mm. Standard height should be 100 mm.If other heights and lengths are used then this should be clearly stated in theIsometric.

Base platethickness

2" ~ 12": 10t14"~: 15t

Material Clamp, baseplate, gussetand rib plate

Material to be carbon steel for all pipes.

Application Application Lines in all materials including GRE lines are supported with clamp shoe except foranchor and line stop.


DNV GL AS

APPENDIX A BALL VALVE REQUIREMENTSTable A-1

Parameter Sub parameter Requirement in API 6D or otherstandards Recommended requirements

Valve design Requirements for the design,manufacturing, testing anddocumentation of pipeline valves

As per API 6D(or ISO 14313) andASME B16.34

Body thickness-

As per ASME B16.34Corrosion margin to be considered.

Pressure andtemperature - ASME B16.34 Table 2

Minimum bore of ball As per Table 1 – Minimum bore forfull-opening valves

API 6D or ISO 14313

Valve design

Body type - Bolted body/side or top entry

NDT Annex B(Supplementary Requirements)

— Castings shall be examined inaccordance with section 8 of ASMEB 16.34

— NDT Extent for casting

Class 150: RT(or UT) 5%

Class 300 ~ 600: RT(or UT) 10%/MT(PT) 10%

Class 900~2500: RT(or UT) 100%/MT(PT) 100%

Fire test certificates If required by purchaser All ball valve designs shall be provenfire safe to the requirements of API607 or API RP 6FA

Pressure test throughhydrostatic shell test andhydrostatic seat test

Pressure test shall be performed asper section 10(API 6D). Pressuretesting, high pressure gas leak test isrequired as alternative to hydro test

As per API 6D with additional highpressure gas seat test(for hydrocarbongas and mixed phase service, notliquid service)

Fugitive Emission Test - N/A.

Non-metallic materialtest (O-ring)

- Product with TAC in accordance withbelow one (1) test- for hydrocarbongas and mixed phase service, notliquid service

1) NORSOK M-710 Cert (Non-metallic test)

2) TOTAL GS PVV 1423) NACE TM 02974) ISO 23936-2

Inspectionand test

Material certificates - EN 10204 Type 3.1 Cert: Metallicpressure partEN10204 Type 2.2 Cert: Non-pressure/non-metallic parts


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NACE MR0175 If sour service is specified, NACE MR0175 shall be applied.

NACE MR0175 to be applicable for allmaterials

Hardness - As per NACE MR0175/ISO 15156requirement

Impact test for carbonsteel

All carbon and low-alloy steels withdesign temperature below − 29°Cshall be impact-tested in accordancewith ISO 148 or ASTM A 370.

All carbon, alloy steels and non-austenitic stainless steel for pressurecontaining parts in valves with aspecified design temperature below-29 °C (-20 °F) shall be impact testedusing the Charpy V-notch technique inaccordance with ISO 148-1 or ASTMA370

Face-to-face dimension As per Table 4 – face-to-face andend-to-end dimensions.Tolerances face to face shall be 2 mmfor size DN250(10") and below/ 3mm for size DN300(12") and above.

As per API 6D or ASME B16.10 longpattern

Forging - Forgings used for valve componentsshall be forged to near/final shape.

Anti-static device If required by purchaser All valves shall have anti-static device

Blow-out proof stem Valves shall be designed with a stemanti-blow-out device.

As per API 6D

Locking device If required by purchaser All manually operated valves shallhave locking device.

Gear operator - Below to be min. gear operated sizes.150#: 8” and larger

300#: 8” and larger





Wrench and handwheel — The maximum force required atthe handwheel or wrench shallnot exceed 360 N.

— Wrenches shall not be longer thantwice the face-to-face or end-to-end dimension of the valve.

— Handwheel diameter(s) shall notexceed the face-to-face or end-to-end length of the valve or 1000 mm, whichever is the smaller

— Hand-wheels for manual valvesshall be sized so that themaximum force required for initialvalve operation shall not exceed360N

— Length of wrench and handwheelshall be in accordance with API 6D

Valve details

Seat design – floatingtype

- — Up to 6" for Class 150— Up to 4" for Class 300


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Seat design – trunniontype

- — Except Floating size range,trunnion type to be applied.

— SPE type seat

Cavity pressure relief If fluid trapping is possible in thebody cavity, automatic cavitypressure relief shall be applied.

— All valves shall be delivered withautomatic cavity pressure reliefcondition

— Drain/vent plug to be applied fortrunnion type

— Plugs must be anti blow-out plugswith 2 "O"-rings and seal weldedafter pressure test

Stem/seat sealantinjection

If required by purchaser Stem/seat sealant injection to beapplied for 6" and above valves

Lifting lug Valves of size 8" and larger shall beprovided with lifting lugs

Valves of size 8" and larger shall beprovided with lifting lugs

Name plate As per Table 12 – Valve marking To be applied as per API 6D or MSSSP-25

End type - ASME B16.5 orASME B16.47 Series A for nominaldiameter 24" above

ASME B16.25 for Butt weld

ASME B16.11 for socket weld andthreaded connection


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APPENDIX B NORSOK VERSUS RECOMMENDED REQUIREMENTS— Appendix B.1 Recommended requirements for Class 1 insulation – Heat conservation on NCS— Appendix B.2 Recommended requirements for Class 2 insulation – Cold medium conservation on NCS— Appendix B.3 Recommended requirements for Class 3 insulation – Personal protection on NCS— Appendix B.4 Recommended requirements for Class 4 insulation – Frost protection on NCS— Appendix B.5 Recommended requirements for Class 5 insulation – Fire protection on NCS— Appendix B.6 Recommended requirements for Class 6 insulation – Acoustic insulation ISO 15665 Class A

on NCS— Appendix B.7 Recommended requirements for Class 7 insulation – Acoustic insulation ISO 15665 Class B

on NCS— Appendix B.8 Recommended requirements for Class 8 insulation – Acoustic insulation ISO 15665 Class C

on NCS— Appendix B.9 Recommended requirements for Class 9 insulation – External condensation and icing

protection on NCS


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Table B-1 NORSOK R-004 versus recommended requirements for Class 1 Insulation – Heatconservation on NCS.


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Note

1) NORSOK R-004 and project specifications do not specify insulation thickness. Insulation thicknessneeds to be calculated in accordance with NS-EN-ISO 12241.

2) Insulation thickness shall be verified on specific project applications.


DNV GL AS

Table B-2 NORSOK R-004 versus recommended requirements for Class 2 Insulation – Coldmedium conservation on NCS.


DNV GL AS

Note


2) Insulation thickness shall be verified on specific project applications.3) Only provided for vapour barrier protection if metallic jacketing is applied.


DNV GL AS

Table B-3 NORSOK R-004 versus recommended requirements for Class 3 Insulation – Personalprotection on for NCS.


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Note




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Table B-4 NORSOK R-004 versus recommended requirements for Class 4 Insulation – Frostprotection on NCS.


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Note




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Table B-5 NORSOK R-004 versus recommended requirements for Class 5 Insulation – Fireprotection on NCS.


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Note




DNV GL AS

Table B-6 NORSOK R-004 versus recommended requirements for Class 6 Insulation – Acousticinsulation ISO 15665 Class A on NCS.

Note




DNV GL AS

Table B-7 NORSOK R-004 versus recommended requirements for Class 7 Insulation – Acousticinsulation ISO 15665 Class B on NCS.

Note




DNV GL AS

Table B-8 NORSOK R-004 versus recommended requirements for Class 8 Insulation – Acousticinsulation ISO 15665 Class C on NCS.

Note




DNV GL AS

Table B-9 NORSOK R-004 versus recommended requirements for Class 9 Insulation – Externalcondensation and icing protection on NCS.


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Note



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CHANGES - HISTORICThere are currently no historical changes for this document.

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