Mobil Ege 05-B-5 (1993) Marine Loading Arms

MARINE LOADING ARMS

MARCH 1993 PAGE 1 OF 16 EGE 05-B-5 — 1993

TABLE OF CONTENTS

1. Scope 5. General2. Purpose 6. Maintenance and Spare Parts3. References 7. Modifications to OCIMF Specification — Part I4. Definitions Appendix — OCIMF Data Sheets

1. SCOPE

This Guide covers the minimum recommended requirements for marine loading arms for use in liquidhydrocarbon and liquefied hydrocarbon gas services. The requirements for quick connect/disconnectcouplers and loading arm control power systems are also covered.

2. PURPOSE

The purpose of the Guide is to specify the requirements for marine loading arms and to provide the specificinformation and guidance required to complete the appended OCIMF data sheets.

3. REFERENCES

The following publications form a part of this Guide. Unless otherwise specified herein, use the latestedition.

OCIMF (Oil Companies International Marine Forum) Specification

Design and Construction Specification for Marine Loading ArmsPart I, SpecificationPart II, Guideline for the Specification

Mobil Engineering Guides

EGE 00-B-3 Structures and Equipment — External Loading Design BasisEGE 00-C-4 Equipment Purchases — General Engineering RequirementsEGS 104 Meteorological Data for Plant Design

4. DEFINITIONS

For definitions, refer to OCIMF Design and Construction Specification for Marine Loading Arms, Part II,Section 3.1.

MOBIL ENGINEERING GUIDE

EGE 05-B-5 — 1993 PAGE 2 OF 16 MARCH 1993

5. GENERAL

5.1 Marine loading arms shall conform to the OCIMF Design and Construction Specification for MarineLoading Arms (in this Guide referred to as the OCIMF specification).

5.2 Suppliers shall comply with the requirements of EGE 00-C-4, as well as the specific requirements ofthe OCIMF specification.

5.3 All equipment covered by this Guide shall be designed for a minimum 25 year operative life in a totallyunprotected marine outdoor installation, with regular maintenance as specified by supplier.

5.4 The OCIMF data sheets appended to this Guide shall be used in the preparation of the marine loadingarm specification.

6. MAINTENANCE AND SPARE PARTS

6.1 Marine loading arms proposed by the supplier shall be of field-proven performance quality and requireminimum maintenance.

6.2 The supplier’s proposal shall include a list of previous users of the type of marine loading armsproposed and contacts with telephone numbers so that customer satisfaction can be verified.

6.3 The supplier shall provide a maintenance manual or equivalent with recommended maintenanceintervals.

6.4 The supplier shall include in his proposal a list of recommended spare parts that should be maintainedby the user at all times. In addition, the supplier shall furnish a complete list of all the parts, lead time, andthe closest source of supply.

6.5 The supplier shall guarantee availability of parts for at least 5 years from the date of supply of theloading arms.

7. MODIFICATIONS TO OCIMF SPECIFICATION — PART I

The following are clarifications or modifications to the OCIMF Specification Part I and the OCIMF datasheets. The paragraph numbers used in the following pages correspond to numbers used in the OCIMFspecification, Part I.

OCIMF SECTION 3.0 — DESIGN AND CONSTRUCTION STANDARDS AND PRACTICES

Paragraph 3.2 (Substitution)

Structural design of the marine loading arms shall be based on the latest edition of AISC Manual of SteelConstruction.


The supplier shall submit to Mobil for approval the General Design and Construction Practices for fabricationof piping, welding, and inspection and testing of materials and equipment.

External loads shall be based on Mobil Engineering Guide EGE 00-B-3. Meteorological data used to develop



magnitudes of the loads shall be based on Mobil Engineering Guide EGS 104. However, local codes, wheremore stringent, shall be used.

Paragraph 3.4.1 (Comment)

Welding shall conform to AWS D-1.1, Welding in Building Construction.


The supplier shall supply full details to Mobil for approval of the following parts, as applicable:

— Pipe material selection— Specification for pressure relief valves, flanges, gaskets, bolting, fittings— Operating and maintenance platforms— Wire rope— Pressure instruments— Instrument control panels— Instrument wire and cable— Protection of electrical equipment in contaminated areas— Selection criteria for electrical materials— Wiring methods— AC motors— Switchgear and control centers— Electrical equipment installation methods— Coating— Cathodic protection— Testing of electrical equipment and instruments— Winterizing— Insulation— Heat Tracing

OCIMF SECTION 4.0 — DESIGN DATA AND REQUIREMENTS

Paragraph 4.2 (Clarification)

The design pressure (see "Des. Press. Bar. Ga.") shall include a value for pressure due to surge effectscaused by the closure of the pier, tanker, or loading arm valves as applicable, which shall be so noted.

Paragraph 4.3 (Clarification)

Item (d), surge fore; Item (e), surge aft; Item (f), sway — These are dependent on the environment and theelasticity of the tanker's mooring system. As a minimum, these dimensions shall be at least 3 m (10 ft).(NOTE: Indicate that either fore or aft surge and sway occur simultaneously.)

Items (g) and (h), heave at manifold — In protected harbors use zero. At exposed berths subject tosignificant waves, these figures should be determined by physical model or computations.

Item (i), list at manifold — Show as zero.


Arm in stored attitude — EGS 104 or local code requirements shall be used, whichever is more stringent.



Arm in maneuvering/connected attitude — A minimum of 23 m/s (45 knots) shall be used.

Arm in hydrostatic test/maintenance attitude — A minimum of 15 m/s (30 knots) shall be used.


Earthquake values shall be based on EGS 104 or local code requirements, whichever is more stringent.

Paragraphs 4.6.2, 4.6.6, and 4.6.7 (Comment)

Simultaneous arm maneuvering and/or operation is not permitted. Only one arm can be operated at a timewhen arms are hydraulically operated.

Paragraphs 4.6.4 and 6.2.5 (Comment)

Loading arms shall be counterweighted for the empty condition. They shall be slightly overbalanced toslowly return the arm to the stored position.


Hydraulically controlled arm shall be designed to prevent it from falling on the tanker deck during anemergency release when the arm may be full or partially full of product.


Audible/visual alarms are recommended for all tanker loading arm installations. Alarms should be set toactuate when any arm reaches within 1 m (3 ft) of its envelope limits.

An Emergency Release System (ERS) shall be provided on arms serving gas carriers and on berths inexposed locations. The ERS shall be provided with an audible/visual alarm that is set to activate when anyarm is within 0.5 m (1.5 ft) of its envelope limits. This provides a second level of alarms prior to triggeringrelease.

Field adjustment systems shall be provided with locking means to prevent unauthorized adjustment.

Logic systems for valve closure and ERS operations shall have an independent battery supply, because aninterrupted power supply can cause actuation of shutdown systems.

Depending on conditions at a specific site, the limits suggested above may need to be revised. Installedsystems shall be capable of being adjusted in the field to utilize operating experience in setting alarm andrelease limits.


A vacuum breaker with check valve shall be supplied at the apex when arms are to be drained by gravityor pumped out.


An adjustable jack shall be provided at the outboard swivel to limit the tanker manifold stresses inaccordance with Section 6.3.18, unless calculations show this is not required.




Ice buildup of 25 mm (1 in.) shall be included for arms used for cryogenic temperature [ 162ºC ( 260ºF)]service in the operating and maneuvering modes.

Paragraph 4.9 (Comment)

Materials shall conform to, or be equal to, those materials specified in Part II, Section 4.9, Table 5.1. Anysubstitution of materials shall be approved by Mobil.

Paragraphs 4.10.1 and 13.1.1 (Clarification)

For normal temperature [> 0ºC (32ºF)] service, all arm assemblies shall be hydrostatically tested in the shop.All fully erected arms shall be hydrostatically tested in place in the field. Suitable vents and bleeders shallbe provided to assist in hydrostatic testing.

Paragraph 4.10.2 (Clarification)

Pneumatic testing is required in the field for arms in low-temperature [ 0ºC (32ºF)] service.


Shop assembly of arms used for low-temperature [ 0ºC (32ºF)] service is required. For arms in normaltemperature service, one arm of each size should be shop assembled for a given order. Hydraulics andalarms do not need to be assembled. A performance (envelope) test is required for all assembled arms.


Swivel tests made in accordance with this specification, and witnessed and certified by a Mobil-approvedinternational classification society, will suffice for the specific design of the swivel to be used, unlessotherwise specified by Mobil.


Coupling tests made in accordance with this specification, and witnessed and certified by a Mobil-approvedinternational classification society, will suffice for the specific design of the coupling to be used, unlessotherwise specified by Mobil.

OCIMF SECTION 5.0 — MATERIALS


Materials shall be specified by Mobil or proposed by vendor at Mobil’s request for Mobil approval.


Aluminum shall not be used for any loading arm part, fitting, or spool piece/reducer.



OCIMF SECTION 6.0 — DESIGN

Paragraph 6.1 (Addition)

For cryogenic temperature [ 162ºC ( 260ºF)] service, where arms are 12 inches in diameter or greater,consideration shall be given to a design in which the product-carrying components are independent of thestructural members.


In the stored position, the arm shall be a minimum of 0.6 m (2 ft) behind the loading platform face.

Paragraph 6.2.4 (Addition)

Ladders shall be provided with safety rail and belt for climbing protection.

OCIMF SECTION 8.0 — QUICK-CONNECT/DISCONNECT CARGO COUPLERS (QCDC)

Paragraph 8.8 (Comment)

With the apex vacuum breaker open, the flange cover shall be capable of withstanding the hydrostatic headof the loading arm filled with product, without leaking.

OCIMF SECTION 11.0 — OPERATING/CONTROL DESIGN

Paragraph 11.11 (Addition)

Hydraulic fittings and valves shall be stainless steel.

Paragraph 11.18 (New Paragraph)

The supplier’s standard safety interlock shall be furnished by the supplier for approval by Mobil.



APPENDIX

OCIMF DATA SHEETS

The following data sheets have beenreproduced with permission from the OilCompanies International Marine Forum(OCIMF).



APPENDIX — OCIMF DATA SHEETS

4.0* DESIGN DATA AND REQUIREMENTS

The following data shall be specified by the owner.

4.1* ARM DATA BASIC

Arm Arm Operation (6.2.1)Arm Dia Cargo to be

Designation Inch Transferred Single Combinations of Simultaneous Operations

Notes:

4.2* CARGO DATA (See Note 1)

Arm Press.Viscosity Cargo Temp. in ºC Des.

Arm Dia Cargo to be Density cSt at Bar Ga. Max.FlowDesignation Inch Transferred Kg/m³ ºC Min.* Max. (6.3.4) Rate m³/sec.

Notes:1. For loading arms used for multiple products, the size selection shall be based on the maximum flow and the maximum viscosity.2. *Indicates items also discussed in Part II of OCIMF.




4.3* TANKER DATA

TANKER SIZES DWT/M³

a. Freeboard at ship’s min mb. side at manifold max mc. Height of Ship’s rail md. Surge fore me. Surge aft mf. Sway mg. Heave at Positive mh. Manifold Negative mi. List at Manifold mj. Height of Manifold above min mk. deck at ship’s rail max ml. Distance of manifold min mm. Flange to ship’s side max mn. Basic allowable stress

Tanker Manifold (6.3.18)Note: Fore and aft surge and sway occur/do not occur simultaneously.




4.4 BERTH DATA

a. Distance top of jetty to lowest low water (LLW) mb. Distance jetty face to berthing line (min/max) / mc. Distance jetty face to center line of risers (min/max) / md. Distance between centre line of risers (min/max) / me. Maximum space available (length) mf. Maximum space available (width) mg. Max. height of obstructions above jetty dock within e and f mh. Maximum allowable unit load on jetty N/m²i. Electric supply V, Phase, Hz

NOTES: See figures 1 and 2.




4.5* ENVIRONMENTAL DATA

4.5.1 Maximum wind velocities for which the arm should be designed are: (wind velocities are given as3-second gust speeds i.e. V in section 6.3.10).10— arm in stored attitude : m/s— arm in manoeuvering/connected attitude : m/s— arm in hydrostatic test/maintenance attitude : m/s

4.5.2 Earthquake to be considered while arm in yes/nostored position (6.3.7) :seismic probability coefficient z =seismic acceleration = g

4.5.3 Ambient temperature (6.3.8) min : ºCmax : ºC

4.5.4 Solar Radiation temperature (6.3.8) : ºC4.5.5 Water levels: highest high water (HHW) (incl. storm set-up). : m

mean sea level : mlowest low water (LLW) : m




4.6 ARM OPERATING DATA

4.6.1 Drives — slewing : hydraulic/manual/vendor optioninboard arm : hydraulic/manual/vendor optionoutboard arm : hydraulic/manual/vendor option

4.6.2 Control systemcentral control (11.2) : yes/nolocal control (11.2) : yes/nosimultaneous arm manoeuvering (11.6) : yes/noaudio-visual alarm (11.13) : yes/no

4.6.3 Quick connect/disconnect coupler (QCDC) (8.1) : yes/nooperation QCDC : hydraulic/manual/vendor option flange rating (8.6):

4.6.4 Counter weighted for (6.2.5): empty/full of cargo.4.6.5 Prevention of arm falling a) counter weight provisions

on ship's deck shall be b) hydraulic control achieved by (9.6): c) other measures

4.6.6 Empty counter weighted arms can beoperated simultaneously (11.12) : yes/no

4.6.7 Arms which can be operated simultaneously (11.6) nos:

4.6.8 Provisions for automatic activation of ERS : yes/noSafety margin on the arm working range at which the rangecontrol to activate the ERS is activated. = m(in meters) (9.5.a)

4.6.9 Provisions for automatic activation of audio-visual alarm : yes/noSafety margin on the arm working range at which the range control toactivate the audio-visual alarm (in meters) (11.13) = m

4.6.10 Position emergency release coupler (9.8) : Horizontally in the vertical up stand of the triple swivel assembly: Vertically in horizontal part of the triple swivel

assembly.




4.7 EMERGENCY RELEASE COUPLING (ERC) DATA

4.7.1 Emergency release coupling required (9.1) : yes/no

4.8 MISCELLANEOUS ARM DATA

4.8.1 Vacuum breaker at apex (10.4.3) : yes/no4.8.2 Cargo purging system at apex/riser base (10.4.4) : yes/no4.8.3 Ladders and platform shall be provided for access to the trunnion : yes/no

and apex swivel (6.2.4)4.8.4 Foundation bolts to be specified : yes/no

foundation bolts to be supplied : yes/no4.8.5 Spare power pack required for hydraulically operated arms : yes/no4.8.6 Hydrostatic test pressure : bar ga4.8.7 Purge system on swivels required (7.5) : yes/no4.8.8 Adjustable jack at outboard swivel required (10.2) : yes/no4.8.9 Washing connection required (10.4.1) : yes/no4.8.10 Thickness of ice build-up to be included in

self weight (DL) and effect on windload (WL) (6.3.6): — stored condition : mm— operating condition : mm




4.9* MATERIAL SPECIFICATION(S)

ARM DESIGNATIONKCV KCV

MATERIAL GROUP ASTM ºC J max ASTM ºC J maxAND CONDITION th th

(mm) (mm)

Plate, sheet, stripstructuralNon-pressure retaining

Pipe

Elbows

Forgings, flangesfittings

Castings

Sections, bars forstructural work

Boltings for structuralworkand flanges ANSI 150

Maximum carbon content(%) (5.2)

Tube and fittings ofhydraulic system (11-11)

PctPca




4.10 INSPECTION AND TESTING

4.10.1 Hydrostatic Test:

Arm designationTest Pressure (in bar ga)Field/Shop

4.10.2 Pneumatic Test:

Arm designationTest Pressure (in bar ga)Field/Shop

4.10.3 Shop Assembly Required (13.2.a): Yes/No. If yes:

Arm designationHydraulics included Yes/NoOperating/control/alarm instruments included Yes/NoPerformance test required Yes/No

4.10.4 Performance test after installation (13.2.b) required: Yes/No.

4.10.5 Swivel Test Required (13.3): Yes/No If yes:

Arm designationSwivel typeInternal pressure when testing

Max. ratio




4.10.6 Test of swivels in cryogenic application required (13.3.6): Yes/No

4.10.7 Test nitrogen purge system for cryogenic swivels required (13.3.7): Yes/NoIf Yes:

Arm designationSwivel typeTest temperature (in ºC)Nitrogen purge press (in bar ga)

4.10.8 QCDC Test required (13.4): Yes/No If Yes:

Arm designation

4.10.9 Emergency release coupling test required (13.5): Yes/No If Yes:Leakage and permanent deformation test (strength test) (13.5.3)

Arm designationTest bending moment MTInternal test pressure (in bar ga)Test temperature (in ºC)

4.10.10 Release performance test (13.5.4)

Arm designationMinimum cargotemperature (in ºC)Ice build-up in m/mNumber of testrepetitions

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Mobil Ege 05-B-5 (1993) Marine Loading Arms

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