100-yer-pe-yss-0438

8/13/2019 100-YER-PE-YSS-0438

1/36

8/13/2019 100-YER-PE-YSS-0438

2/36

8/13/2019 100-YER-PE-YSS-0438

3/36

Previous Issue: 30 June, 2003 Next Planned Update: 1 January, 2009Revised paragraphs are indicated in the right margin Page 1 of 34Primary contact: Mahmoud Y. Naffa'a on 874-7263

Materials System Specification 32-SAMSS-005 31 December, 2003Manufacture of Atmospheric Tanks

Vessels Standards Committee Members Naffa'a, M.Y., Chairman Al-Anizi, S.S. Al-Gahtani, M.S. Al-Musaiid, H.A. Al-Sharhan, Z.S. Jones, S.B.Khanna, R.K.Khouie, S.B.Kim, S.U.

Muir, W.R.Walsh, M.P.

Saudi Aramco DeskTop Standards Table of Contents

1 Scope............................................................ 22 Materials....................................................... 53 Design........................................................... 64 Fabrication.................................................... 125 Erection......................................................... 136 Methods of Inspecting Joints........................ 187 Welding Procedure and Welder

Qualifications........................................ 198 Marking......................................................... 199 Coatings and Painting.................................. 1910 Documentation............................................. 2011 Disinfection................................................... 20

Appendix B Recommendations for Designand Construction of Foundations for

Aboveground Oil Storage Tanks.................. 21 Appendix C - External Floating Roofs................ 22 Appendix G Structurally Supported

Aluminum Dome Roofs................................ 27 Appendix H Internal Floating Roofs................. 29

8/13/2019 100-YER-PE-YSS-0438

4/36

Document Responsibility: Vessels 32-SAMSS-005Issue Date: 31 December, 2003

Next Planned Update: 1 January, 2009 Manufacture of Atmospheric Tanks

Page 2 of 34

The following paragraph numbers refer to API STD 650, Tenth Edition, November1998 with Addendum 3, September 2003, which is part of this specification. The text ineach paragraph below is an addition, exception, or deletion to API STD 650requirements as noted. Paragraph numbers not appearing in API STD 650 are new

paragraphs to be inserted in numerical order.

1 Scope

1.1 General

1.1.6 Appendix B and all other pertinent requirements of this specificationshall be used as the basis for developing detailed design and constructionof foundations for storage tanks.

1.1.7 Additional requirements for external floating roofs are contained inAppendix C of this specification.

1.1.11 Additional requirements for optional self-supporting aluminum domeroofs are contained in Appendix G of this specification.

1.1.12 Additional requirements for internal floating roofs are contained inAppendix H of this specification.

1.1.23 This specification shall be attached to and form an integral part of a purchase order.

1.3 Compliance

1.3.1 Any conflicts between this Specification and other Saudi AramcoMaterials System Specifications (SAMSSs), Saudi Aramco EngineeringStandards (SAESs), industry codes and standards, and Saudi AramcoStandard Drawings (SASDs) and Forms shall be resolved in writing bythe Company or Buyer Representative through the Manager, ConsultingServices Department of Saudi Aramco, Dhahran.

1.3.2 Direct all requests to deviate from this specification in writing to theCompany or Buyer Representative, who shall follow internal company

procedure SAEP-302 and forward such requests to the Manager,Consulting Services Department of Saudi Aramco, Dhahran.

1.4 Referenced Publications

Materials or equipment supplied to this specification shall comply withthe latest edition of the references listed below and those referenced inAPI 650, unless otherwise noted.

8/13/2019 100-YER-PE-YSS-0438

5/36



Page 3 of 34

1.4.1 Saudi Aramco References

Saudi Aramco Engineering Procedures

SAEP-302 Instructions for Obtaining a Waiver of a Mandatory Saudi Aramco Engineering Requirement

SAEP-327 Disposal of Waste Water from Cleaning,Flushing and Hydrostatic Tests

SAEP-1142 Qualification of non-Saudi Aramco NDTPersonnel

Saudi Aramco Engineering Standards

SAES-A-007 Hydrostatic Testing Fluids and Lay-UpProcedures

SAES-A-102 Ambient Air Quality and Source EmissionStandard

SAES-A-206 Positive Material Identification

SAES-B-017 Fire Water System Design

SAES-B-018 Air Foam Systems for Storage Tanks

SAES-B-067 Safety Identification & Safety Colors

SAES-H-001 Selection Requirements for Industrial

CoatingsSAES-W-017 Welding Requirements for Tanks

Saudi Aramco Materials System Specifications

09-SAMSS-107 Application of CompositeFluoropolymer/Ceramic Coatings toFasteners

32-SAMSS-017 Side-Entry Mixers

34-SAMSS-319 Radar Tank Gauging Equipment

Saudi Aramco Standard Drawings

AB-036003 Manholes and Vents for Tanks

AD-036061 Roof Center Vents for Cone-Roof Tanks

AD-036129 Details of Gauger's Platform for Floating Roof Tanks

8/13/2019 100-YER-PE-YSS-0438

6/36



Page 4 of 34

AA-036256 Radar, Temperature, and ManualGauging

AA-036355 Impressed Current Tank Bottom CathodicProtection Details

AB-036387 Tank Grounding

AA-036504 Assembly and Details of Gage Well andGuide Pole for Floating Roof Tanks

Saudi Aramco Inspection Requirements

Form 175-324900 Tanks: Atmospheric, Steel within theScope of 32-SAMSS-005

Saudi Aramco Forms and Data Sheets

Form 2693-ENG Safety Instruction Sheet-Tanks

Form 2696-ENG Appurtenance Schedule and Orientations

Form NMR-7918-1 Nonmaterial Requirements for Tanks

Form NMR-7918-2 Nonmaterial Requirements for Floatingand Internal Floating Roofs

1.4.2 Industry Codes and Standards

American Petroleum Institute

API STD 650 Welded Steel Tanks for Oil Storage

API STD 2000 Venting Atmospheric and Low-PressureStorage Tanks

API RP 2003 Protection Against Ignitions Arising Outof Static, lightning, and Stray Currents

American Society of Mechanical Engineers (Boiler and PressureVessel Code)

ASME B16.11 Forged Fittings, Socket-Welding andThreaded

ASME SEC V Nondestructive Examination

National Fire Protection Association

NFPA 68 Guide for Venting of Deflagration

8/13/2019 100-YER-PE-YSS-0438

7/36



Page 5 of 34

NFPA 255 Standard Method of Test of Surface Burning Characteristics of Building Materials

American Water Works Association

AWWA C652 Disinfection of Water Storage Facilities

1.5 Definitions

Design Engineer: The Engineering Company responsible for specifyingthe design requirements on the Storage Tank Data Sheet.

Design Metal Temperature: The lowest of the following temperaturevalues:

1) The lowest one-day mean atmospheric temperature (LODMAT) per SAES-A-112, or

2) The minimum operating temperature, or

3) The hydrostatic test temperature

Saudi Aramco Engineer: The Supervisor of the Process EquipmentUnit, Consulting Services Department, Dhahran.

Saudi Aramco Inspector: The person or company authorized by the

Saudi Aramco Inspection Department to inspect tanks to therequirements of this specification.

Tank Manufacturer: The Company responsible for the design andfabrication of tanks.

2 Materials

2.1 General

2.1.1 The Tank Manufacturer shall submit a complete material specificationwith the proposal.

The Tank Manufacturer may propose the use of alternative materials tothose that are listed in API STD 650. The alternative materials shallcomply with all the other requirements of API STD 650 and thisspecification. The chemical compositions and mechanical properties ofnon-ASTM materials shall be submitted to the Saudi Aramco Engineerfor approval.

8/13/2019 100-YER-PE-YSS-0438

8/36



Page 6 of 34

Materials proposed by the Tank Manufacturer that are equivalent tothose specified in API STD 650 shall be approved by the Saudi AramcoEngineer.

2.1.2 (Exception) All materials shall be clearly identified and provided withmill test certificates. Materials shall be alloy-verified by the TankManufacturer in accordance with SAES-A-206 .

2.2 Plates

2.2.1 General

2.2.1.5 Annular plate material shall be of the same material group per API STD650 as the lowest shell course.

2.2.1.6 Rimmed and capped steels shall not be used for shell, bottom and roof plates.

2.2.9.3 (Exception) The design metal temperature as defined in paragraph 1.5 ofthis specification shall be used as the basis for impact test exemption ofFigure 2.1 of API STD 650.

2.7 Bolting

Flange bolting material shall conform to A193 Grade B7 bolts withA194 Grade 2H nuts. All bolting shall be coated with afluoropolymer/ceramic coating in accordance with 09-SAMSS-107 .

2.9 Gaskets

Gasket materials shall be non-asbestos according to SAES-L-005.

3 Design

3.1 Joints

3.1.3 Restrictions on Joints

3.1.3.5 Lap-welded joints shall be lapped at least five times the nominalthickness of the thinner plate joined; however, with double-welded lap

joints, the lap need not exceed 50 mm (2 in.), and with single-welded lap joints, the lap shall not be less than 25 mm (1 in.).

3.1.5 Typical Joints

8/13/2019 100-YER-PE-YSS-0438

9/36



Page 7 of 34

3.1.5.3a (Exception) Top angles shall be attached to the shell by butt welds withcomplete penetration and complete fusion.

3.2 Design Considerations

3.2.6 Information provided by the Design Engineer on the API STD 650Storage Tank Data Sheet and a completed Saudi Aramco Form 2696-ENG shall be used for the tank design in accordance with API STD 650and this specification.

3.2.7 Nozzle Loads

3.2.7.1 Associated piping systems loads shall be specified on the tank data sheet.

3.2.7.2 Tank Manufacturer shall ensure that stresses at nozzle-to-tankconnections, due to piping loads specified on the tank data sheet, arewithin the allowable limits.

3.3 Special Considerations

3.3.4 Weld Hardness

Weld hardness testing requirements and acceptance criteria shall be inaccordance with SAES-W-017 .

3.3.5 A foundation drip ring shall be provided in order to prevent the ingressof rainwater or condensation between the tank bottom and foundation.The ring shall meet the following requirements.

1) Material shall be carbon steel, 3.2 mm (1/8 inch) thick.

2) Continuously seal welded to the edge of the tank bottom or annular plate. All radial joints between the drip ring sections shall also beseal welded.

3) Extend at least 75 mm (3 inch) beyond the outer periphery of theconcrete ring wall.

4) Turn down at its outer diameter at a 45-degree angle.

5) The top of the drip ring and a 75 mm (3 inch) height of the tankshell shall be painted with a 250-300 microns (10-12 mils) thickepoxy coating in accordance with SAES-H-001 .

3.3.6 Under-tank leak detection and sub-grade protection

8/13/2019 100-YER-PE-YSS-0438

10/36



Page 8 of 34

3.3.6.1 Tanks in services other than water shall be provided with under tank leakdetection and sub-grade protection according to API STD 650, AppendixI. Acceptable construction details are Figures I-1, I-2, I-3, I-6, I-7, I-8, I-9 and I-10.

3.3.6.2 Flexible membrane leak-barrier (liner) of minimum 1000 microns(40 mils) thickness compatible with the stored product shall be specifiedunder the tank bottom. The liner shall be placed in accordance withSASD AA-036355, extending to the internal top edge of the ringfoundation.

3.3.6.3 Joints in the liner shall satisfy the leak tightness, permeability andchemical resistance requirements for the liner material.

3.3.6.4 Alternative under-tank leak detection and sub-grade protection systemsshall not be permitted without the prior approval of the Saudi AramcoEngineer.

3.3.7 Reinforcing pads and all other external attachment pads shall haverounded corners of minimum 50 mm (2 inch) radius. Pads that covershell seams shall be provided with a 6 mm telltale hole.

3.4 Bottom Plates

3.4.4 Tank bottom shall be sloped in accordance with the specification provided on the Storage Tank Data Sheet.

3.4.5 Bearing plates shall be provided under all fixed roof support columns.The bearing plates shall be twice the diameter of the column section witha minimum 356 mm diameter (14 inch), 12.7 mm (1/2 inch) thick, andshall be attached to the bottom by 4.8 mm (3/16 inch) continuous filletwelds.

3.6 Shell Design

3.6.5 Design methods other than the one-foot method and the variable-design- point method provided in API STD 650 shall be approved by the SaudiAramco Engineer.

3.7 Shell Openings

3.7.1 General

3.7.1.10 Number, size, type, and orientation of nozzles and manways shall be inaccordance with SASD AB-036003 and as specified on the Storage TankData Sheet.

8/13/2019 100-YER-PE-YSS-0438

11/36



Page 9 of 34

3.7.6 Shell Nozzles and Flanges

3.7.6.4 All shell nozzles shall be the API Low Type, unless otherwise specified.

3.8 Shell Attachments and Tank Appurtenances

3.8.2 Bottom Connections

When specified, bottom connections shall be designed in accordancewith API STD 650, Appendix O.

Connections shall be fabricated from elbows; miter joints are prohibited.

Vortex breakers shall be provided for bottom connections.

3.8.5 Roof Nozzles3.8.5.3 All open vents shall be protected by bird screens, except those in asphalt

service.

3.8.9 Threaded Connections

Threaded and socket welded connections shall be in accordance withASME B16.11.

3.8.10 Platforms, Walkways, and Stairways

3.8.10.1 Type and location of stairway shall be as specified on the Storage TankData Sheet and Saudi Aramco Form 2696-ENG.

3.8.10.2 Gauger's platform in accordance with SASDAD-036129 shall be provided for external floating roof tanks.

3.8.10.3 Stairs and platforms shall be fabricated of open grating. Checker-plategrating is not permitted.

3.8.10.4 Walkways shall be fabricated of diamond-pattern (checker-plate) gratingwith anti-skid paint.

3.8.10.5 Stairways on insulated tanks shall be provided with stringers on bothsides.

3.8.11 Floating Suction Lines

3.8.11.1 Floating suction lines shall be provided, when specified on the StorageTank Data Sheet.

8/13/2019 100-YER-PE-YSS-0438

12/36



Page 10 of 34

3.8.11.2 Floating suction lines using rigid pipe shall be designed to prevent themfrom being raised past the vertical axis.

3.8.11.3 Floating suction lines using articulated pipe shall be designed so that thetip of the suction line is always on the axial centerline of the tankthroughout its total travel.

3.8.12 Inlet Diffusers

3.8.12.1 An inlet diffuser shall be provided for tanks with internal floating roofs.The inlet diffuser shall be sized based on the maximum pumping in rateand the maximum permissible exit velocity through the slots in thediffuser.

3.8.12.2 The diffuser shall be slotted. The slots shall be located at 60 degrees(2 o'clock and 10 o'clock positions) from the vertical centerline of thediffuser.

3.8.12.3 Number and dimensions of slots shall be calculated so that the exitvelocity does not exceed 1 m/sec (3.28 ft/sec) at the maximum inlet flowuntil there is a minimum of 1m of liquid cover over the inlet.

3.8.13 Mixers

3.8.13.1 Number and type of mixers shall be as specified on the Storage TankData Sheet.

3.8.13.2 Side-entry propeller mixers shall be designed, inspected, and tested inaccordance with 32-SAMSS-017 .

3.8.13.3 Nozzles for side-entry mixers shall be designed in accordance with APISTD 650 for manways. Supports for the mixer may be needed tomaintain stresses at the nozzle-to-shell junction within the allowablelimits.

3.8.13.4 Jet-nozzle mixers shall not be used in tanks with internal floating roofson floats.

3.8.14 Foam and Water SystemsFire or cooling water and foam systems shall be provided in accordancewith SAES-B-017 and SAES-B-018 , respectively, when specified on theStorage Tank Data Sheet.

3.8.15 Gauging

8/13/2019 100-YER-PE-YSS-0438

13/36



Page 11 of 34

3.8.15.1 External-floating roofs shall be provided with a radar gage assembly inaccordance with SASD AA-036256 and SAES-J-300.

3.8.15.2 External floating roof tanks shall be provided with a radar liquid levelgauge in accordance with 34-SAMSS-319 , located adjacent to thegauger's platform. The top of the gauge piping shall be located from 150mm (6 inch) to 300 mm (12 inch) above the platform handrail andapproximately 150 mm (6 inch) horizontally from the gauger's platformfor easy maintenance access.

3.8.15.3 Fixed-roof tanks shall be provided with a radar gauge assembly.

3.8.16 Grounding

3.8.16.1 Tanks in hydrocarbon services shall be provided with grounding lugs inaccordance with SASD AB-036387 at a minimum of four points spacedequidistantly around the base of the tank.

3.8.16.2 The design of bonding shunts between the tank shell and the roof shall be in accordance with SASD AB-036387 and API RP 2003requirements.

3.9 Top and Intermediate Wind Girders

3.9.4 Stiffening Rings as Walkways

Top wind girders, when specified as walkways, shall be located 1067mm (42 inch) from the top of the tank.

3.9.7 Intermediate Wind Girders

3.9.7.1 The minimum required thickness for the design condition, excludingcorrosion allowance, shall be used to calculate the maximum height ofunstiffened shell.

3.10 Roofs

3.10.2 General

3.10.2.1 Type of roof shall be as specified on the Storage Tank Data Sheet.

3.10.2.9 When an internal coating is specified for a fixed roof, a self-supportedroof shall be used, and the roof lap joints shall be continuously weldedon both sides.

3.10.4 Supported Cone Roofs

8/13/2019 100-YER-PE-YSS-0438

14/36



Page 12 of 34

3.10.4.6 (Exception) Only welded joints are permitted for all structuralattachments in the roof supporting system other than the following joints:

a) Rafter clips for the outer row to the tank shell.

b) Column-base clip guides to the tank bottom.

3.10.5 Self-Supporting Cone Roofs

Only welded joints are permitted for all structural attachments in the roofsupporting system.

3.10.6 Self-Supporting Dome and Umbrella Roofs

Only welded joints are permitted for all structural attachments roofs'

supporting systems in self-supporting roofs, except for self-supportingaluminum dome roofs.

3.10.8 Tank Venting

3.10.8.1 (Exception) Fixed roof tanks with internal floating roofs shall be treatedas fixed roof tanks when determining their venting requirements.

Commentary Note:

When circulation vents are not installed in fixed roof tanks with an internalfloating roof, individual designated venting devices/arrangement shall beprovided for the fixed roof and the internal floating roof according toventing requirements of API STD 2000 and this specification.

3.10.8.3 (Exception) Emergency venting capacity per API STD 2000 andexplosion hatch per NFPA 68 shall be provided for API STD 650 fixedroof tanks. A frangible shell-to-roof joint may be considered as analternative to additional venting devices that are normally provided torelieve excess pressure during emergency conditions for tanks ofdiameters equal to or larger than 50 feet. Frangible shell-to-roof jointshall conform to the requirements of API STD 650.

3.10.8.4 Venting requirements shall be specified in accordance with API STD

2000, SAES-J-600, SASD AB-036003 and AD-036061 and therequirements of this specification.

4 Fabrication

4.1 General

4.1.1 Workmanship

8/13/2019 100-YER-PE-YSS-0438

15/36



Page 13 of 34

4.1.1.3 All flange bolt holes shall straddle the axial centerline of the tank.

4.1.4 Marking

4.1.4.1 Marking shall be done with water soluble materials containing nosubstances that would attack or harmfully affect the tank at both ambientand operating temperature.

4.1.4.2 Marking materials shall be free of lead, sulfur, zinc, cadmium, mercury,chlorine or any other halogens.

4.1.5 Shipping

All flange faces and other machined surfaces shall be greased and properly protected for shipping.

4.2 Shop Inspection

4.2.3 Saudi Aramco Inspector shall have the right to inspect the fabrication atany state and to reject material or workmanship, which does not conformto the specified requirements.

5 Erection

5.1 General

5.1.1 The Tank Manufacturer shall check to ensure that the dimensionaltolerances of the tank foundation are satisfactory prior to start oferection.

5.1.6 The bottom side of the bottom plates shall be cleaned of all foreignmatter and grit-blast cleaned prior to being coated and placed in positionfor welding. The topside surface of bottom plates, regardless whethercoating is required or not, shall also be grit-blast cleaned prior towelding. Surface preparation shall be according to APCS-3 orAPCS-113, as applicable.

5.2 Details of Welding

5.2.1 General

5.2.1.11 Documentation that details the welding sequences for the tank shall be provided to Saudi Aramco prior to the start of field erection.

5.2.1.12 All structural attachment welds to the tank shell, bottom, roof, andappurtenances shall be continuously seal welded.

8/13/2019 100-YER-PE-YSS-0438

16/36



Page 14 of 34

5.2.1.13 All welds shall be free from coarse ripples, undercuts, grooves, overlaps,abrupt ridges and valleys to avoid stress concentration points andinterference with interpretation of NDT results.

5.2.2 Bottoms

5.2.2.4 Weld crowns of the bottom annular plate joints shall be ground flush atthe contact areas with the first shell course.

5.2.4 Shell-to-Bottom Welds

5.2.4.1 (Exceptions)

a) Perform oil-penetrate leak test on the entire length of the first weld pass by applying high flash point penetrant oil such as light dieseloil for a minimum 4 hours (preferably overnight).

b) Perform oil-penetrate leak test on the entire length of the firstcompleted weld, before welding the second fillet weld, by applyinghigh flash point penetrant oil such as light diesel oil for a minimum4 hours (preferably overnight). Alternatively, apply a vacuum testat 35 kPa gauge (5 psig), using a vacuum box fit to the shell-to-

bottom junction.

c) The inside fillet welds of the shell-to-bottom joint in a cylindricalflat-bottom tank shall be examined by either the dye-penetrant or

wet-fluorescent magnetic particle method before hydrotest.5.2.4.2 Delete this paragraph.

5.2.4.3 Delete this paragraph.

5.2.5 Roofs

5.2.5.1 Internal floating roofs shall be installed in accordance with theinstructions provided by the internal floating roof manufacturer.

5.2.5.2 Prior to the installation of fixed roof plates, roof 's column supports shall

be inspected for plumbness. Roof support columns with out-of- plumbness exceeding 1/200 of the total tank shell height shall berealigned.

5.2.5.3 All internal clips, lugs, brackets etc. that are used temporarily forconstruction purposes shall be removed from the roof supportingcolumns and shell plates and ground flush and smooth prior to roofinstallation.

8/13/2019 100-YER-PE-YSS-0438

17/36



Page 15 of 34

5.3 Inspection, Testing, and Repairs

5.3.1 General

5.3.1.1 Inspection shall be in accordance with Saudi Aramco InspectionRequirement Form 175-324900, SAES-W-017 and the followingadditional requirements.

5.3.1.5 All required Nondestructive Examination shall be performed inaccordance with inspection procedures that are in complete compliancewith ASME SEC V and this specification. This written procedure shalladdress each inspection method and technique used including acceptancecriteria. When required by the purchase order the procedure(s) shall besubmitted to Saudi Aramco Inspection Department for approval.

5.3.1.6 All Nondestructive Examination, including Magnetic Particle and LiquidPenetrant examinations, shall be performed by personnel certified inaccordance with SAEP-1142 , or equivalent National CertificationPrograms that has been approved by the Saudi Aramco InspectionDepartment. Personnel responsible for interpretation of NondestructiveExamination results shall be certified to a minimum of Level II.

5.3.1.7 Prior to final inspection and pressure testing, the inside and outside ofthe tank shall be thoroughly cleaned of all slag, scale, dirt, grit, weldspatter, paint, oil, etc.

5.3.1.8 Saudi Aramco Inspector may reject the use of any materials, equipment,or tools that do not conform to the specification requirements, jeopardizethe safety of personnel, or impose hazard or damage to Saudi Aramco

property.

5.3.1.9 Testing shall be in accordance with Saudi Aramco InspectionRequirements Form 175-324900 and the following additionalrequirements.

5.3.3 Inspection of Tank Bottom Welds

(Exception) Only vacuum box test method is permitted.

5.3.5 Testing of the Shell

5.3.5.1 Tanks shall be hydrostatically tested by filling it with water of quality inaccordance with SAES-A-007 as follows:

1) to the maximum design liquid level, H specified in API STD 650,

8/13/2019 100-YER-PE-YSS-0438

18/36



Page 16 of 34

2) for a fixed roof tank , to 50 mm (2 in.) above the weld connectingthe roof plate or compression bar to the top angle or shell; or

3) to a level lower than that specified in items (a) or (b) whenrestricted by overflow, an internal floating roof, or other freeboard.

5.3.5.2 Hydrostatic testing duration shall be minimum 24 hours. The water-filling rate shall not exceed the rate shown in the following table:

Water Filling Rate Table

Botto m Course Thickness Tank Portion Filling Rate

Top course 300 mm/hourLess than 22 mm

Below top course 450 mm/hour

Top third of tank 225 mm/hourMiddle third of tank 300 mm/hour22 mm and more

Bottom third of tank 450 mm/hour

5.3.5.3 Testing of the shell by a method other than hydrotesting such as paintingwith highly penetrating oil, applying vacuum or a combination of bothmethods is not permitted.

5.3.5.4 Floating roof seals, either primary or secondary, if required per SAES-A-102 , shall be completely contained within the shell when the test waterlevel reaches the test liquid level.

5.3.5.5 The Tank Manufacturer shall furnish all test materials and facilities,including blinds, bolting, and gaskets.

5.3.5.6 The tank shall be completely drained and thoroughly dried immediatelyafter completion of the hydrostatic test. If sea water or raw water is usedfor hydrostatic testing of tanks in other than these services, the tank shall

be thoroughly washed with fresh water immediately after draining.

5.3.5.7 The Tank Manufacturer's plan for disposal of hydrotest water shall beevaluated against SAEP-327 by the engineering contractor.

5.3.6 Testing of the Roof5.3.6.1 (Exception) All roof weld joints of a tank designed to be gas tight, such

as a tank with peripheral circulation vents or a tank with free or openvents, shall be vacuum box tested. Applying internal pressure for thedetection of leaks is not permitted. External floating roof testing shall bein accordance with Appendix C of this specification. Internal floatingroof testing shall be in accordance with Appendix H of this specification.

8/13/2019 100-YER-PE-YSS-0438

19/36



Page 17 of 34

5.3.8 Magnetic Particle or Liquid Penetrant Examination

The inside fillet welds of the shell-to-bottom weld joint shall be

examined by either the dye penetrant or magnetic particle method beforethe hydrostatic test.

5.4 Repairs to Welds

5.4.5 Repairs to welds shall be in accordance with SAES-W-017 .

5.6 Tank Settlement Measurements

5.6.1 The base elevation shall be established and recorded at equidistantlocations around the tank circumference in multiples of four, but not toexceed 10 m (32.8 foot) between each reference point and no less thaneight (8) locations. The measurement points shall be at well markedlocations on the bottom projection outside the tank or on clips welded tothe shell. Elevation readings shall be taken as follows:

1) Before hydrostatic testing has started.

2) At the filled point.

3) At the filled point.

4) After 24 hours from filling the tank at the maximum water fillheight.

5) After the tank has been emptied of test water.

5.6.2 Any differential settlement greater than 1.5 mm (60 mils) per meter ofcircumference, or a uniform settlement in excess of 50 mm (2 inch), shall

be reviewed by the Saudi Aramco Engineer. Filling shall be stoppeduntil clearance to continue has been received from the Saudi AramcoEngineer.

5.6.3 For tanks 15.24 m (50 foot) diameter and larger, internal bottomelevation measurements shall be made before and after the hydrostatic

test. These measurements shall be made at 3 m intervals along diametriclines across the bottom. The diametric lines shall be spacedapproximately 10 m (32.8 foot) apart at the tank shell.

6 Methods of Inspecting Joints

6.1 Radiographic Method

8/13/2019 100-YER-PE-YSS-0438

20/36



Page 18 of 34

6.1.1 Application

(Exception) Radiographic inspection is required for the weld joining the

top angle to the shell.

6.1.2 Number and Location of Radiographs

6.1.2.4 (Exception) This requirement is permitted only if a group of tanks areerected by the same tank manufacturer.

6.1.5 Radiographic Standards

Tungsten inclusions in gas tungsten arc welds shall be evaluated asindividual rounded indications. Clustered or aligned tungsten inclusionsshall be removed and repaired.

6.1.6 Determination of Limits of Defective Welding

The additional spots to be radiographed shall be specified by the SaudiAramco Inspector in accordance with SAES-W-017 .

6.2 Magnetic Particle Examination

6.2.5 Magnetic Particle Examination shall be according to SAES-W-017 .

6.5 Visual Inspection

Welds shall be visually inspected for any defects prior to performingnondestructive examination (radiography, magnetic particle, liquid

penetrant, ultrasonic). Visual inspection shall not replace any requirednondestructive examination.

6.6 Vacuum Testing

6.6.3 (Exception) A partial vacuum of 70 kPa gauge (10 psig) shall be used forthe test.

6.6.11 Delete this paragraph.

7 Welding Procedure and Welder Qualifications

7.2 Qualification of Welding Procedures

7.2.1 General Requirements

8/13/2019 100-YER-PE-YSS-0438

21/36



Page 19 of 34

7.2.1.1 All welding procedures and procedure qualifications shall be inaccordance with SAES-W-017 and be submitted for review by SaudiAramco.

8 Marking

8.1 Nameplates

8.1.5 All tanks with internal coatings shall have the Approved ProtectiveCoating Systems specification number (APCS number) marked on thenameplate.

8.4 Tank number and content shall be painted in both Arabic and English at90 degree intervals around the tank in accordance with SAES-B-067 .

8.5 Marking shall be done with water soluble materials containing nosubstances that would attack or harmfully affect the tank at both ambientand operating temperature.

8.6 Marking materials shall be free of lead, sulfur, zinc, cadmium, mercury,chlorine, or any other halogens

9 Coatings and Painting

9.1 Type of coating and painting systems to be applied shall be as specifiedon the Storage Tank data Sheet.

9.2 Surfaces to be coated shall be cleaned and prepared prior to its coating inaccordance with the applicable coating and painting systems.

9.3 Tank placed directly on soil sub-grade shall be coated with APCS-3 orAPCS-113, as applicable, on its soil side leaving minimum 2.5 cm (1inch) wide strip of uncoated steel along the underside of the floor plate,centered on, and directly below the weld seam. This will typicallyrequire masking a strip along the underside of each end (edge) of each

bottom plate approximately 5 cm (2 inch) wide. APCS-3 shall bespecified for tank with maximum operation temperature of 70 C

(158 F), while APCS-113 shall be specified for higher operationtemperatures.

9.4 In tanks where internal coating is not required, top side of the bottom andthe bottom portion of the shell, starting from the tank bottom up tominimum one foot above water line, shall be coated according to theapplicable coating specifications.

8/13/2019 100-YER-PE-YSS-0438

22/36



Page 20 of 34

9.5 Gasket contact surfaces shall not be coated or painted.

9.6 The tank number and content shall be painted in both Arabic and English

at 90 degree intervals around the tank.

10 Documentation

The Tank Manufacturer and internal floating roof manufacturer shall prepare drawings,calculations, and data in accordance with Form NMR-7918-1 and Form NMR-7918-2,

Non-Material Requirements, as applicable.

Drawings and calculations, which are approved by the Design Engineer, shall notrelieve the Manufacturer of the responsibility to comply with the Code and thisspecification.

11 Disinfection

11.1 All potable water storage tanks shall be disinfected in accordance withAWWA C652.

11.2 The chlorine and bacteriological tests shall be approved by theEnvironmental Health Department of Saudi Aramco.

Revision Summary31 December, 2003 Major Revision

8/13/2019 100-YER-PE-YSS-0438

23/36



Page 21 of 34

Appendix B Recommendations for Design and Construction of

Foundations for Aboveground Oil Storage TanksB.2 Subsurface Investigation and Construction

B.2.6 Top fill layer 10-15 cm (4-6 inch) shall be a mixture of sweet sand and3% cement (33:1 ratio, i.e., 3% cement). The material specifications andmixing requirements shall be as follows:

1) The maximum permissible soil content is 0.1%. Sand shall bedried to a free-moisture content of not more than 2.0% by weight ofdry soil.

2) The dry sand must be screened through 6.4 mm (1/4 inch) mesh(maximum). Care must be taken in using clean mixing andhandling equipment to ensure mixture remains free from foreignmatter.

3) The sand shall then be thoroughly mixed with cement in a 33:1ratio by weight in a concrete mixer. After laying the mixture shall

be rolled a minimum six times by a 3-ton roller. Vibratory platetampers may be used in lieu of rollers for areas where a rollercannot reach and/or cover.

8/13/2019 100-YER-PE-YSS-0438

24/36



Page 22 of 34

Appendix C - External Floating Roofs

C.2 MATERIAL

(Exceptions)

Galvanized parts shall not be used.

Electrical bonding shunt materials shall be Type 304 stainless steel.

C.3 DESIGN

C.3.3 Decks

C.3.3.1 (Exception) Roofs shall be of the contact type designed to eliminate the presence of any air-vapor mixture under the deck.

C.3.4 Pontoon Design

C.3.4.1 Floating roofs shall have sufficient buoyancy to remain afloat based onthe lower of the product specific gravity or 0.7, with the primary draininoperative for the conditions stated in API STD 650.

C.3.3.5 The deck of single deck pontoon floating roofs shall be in contact withthe liquid during normal operation.

C.3.3.6 Roofs greater than 91 m (300 foot) in diameter shall be of the double-deck type.

C.3.7 Ladders

C.3.7.1 Rolling ladders shall meet the following requirements:

1) The minimum inside width of the ladder shall be 710 mm (28inch).

2) Wheels shall be provided at the lower end of the ladder and sized to prevent binding of the ladder at any position and provided withsealed non-lubricating bearings.

3) Self-leveling treads shall be used for the ladder.

C.3.8 Roof Drains

(Exception) External floating roofs shall be provided with primary drainsof either the flexible pipe (Coflexip or equal), or the articulated pipe

8/13/2019 100-YER-PE-YSS-0438

25/36



Page 23 of 34

type. A swing type check valve shall be provided at the inlet of thedrain. Siphon type drains are not acceptable for primary roof drains.Siphon type drains, however, may be provided as a secondary roof drainif specified on the Storage Tank Data Sheet. Emergency drains fordouble deck floating roofs shall be of the open-type design.

C.3.9 Vents

C.3.9.1 As a minimum, two overpressure/vacuum bleeder type vents shall beinstalled. Vents shall be sized to handle a total of 125% of the maximumfilling/withdrawal rates that are specified on the Storage Tank DataSheet.

Commentary Note:

Bleeder vents shall be designed to open and close automatically whenthe roof is 75mm above its low support legs position upon emptying andfilling the tank, respectively.

C.3.9.2 Vents for protection against overpressure/vacuum, while the roof isfloating, shall be provided as follows:

1) Their overall capacity shall be determined according to APIstandard 2000 requirements, considering 25% of thefilling/emptying rates and 100% of thermal breathing.

2) Vents shall be evenly distributed and close to the roof periphery

enough vents shall be provided close to the inlet diffuser in serviceswhere gas slugs are expected.

3) Vents shall be designed so as not to allow any carry over of storedliquid onto the floating roof.

Commentary Notes:

i Normally, vents are of the open type that does not undergo testing butrather in-situ inspection. In case relief valves are used, their number shallbe such that the total required venting capacity is always available whena number of valve(s) are removed for testing.

ii) Anticipated operation upset conditions such as an increase intemperature of the input stream to a tank or chemical injection that willresult in vaporization beyond that associated with the true vapor pressuredesign limit of 90 kPa (13 psia) and gas purges shall be also consideredin determining the required venting capacity.

C.3.10 Supporting Legs

C.3.10.3 Support legs shall be carbon steel pipe, Schedule 80 minimum thickness.

8/13/2019 100-YER-PE-YSS-0438

26/36



Page 24 of 34

C.3.10.4 Support legs shall be adjustable to two positions. The lower positionshall allow the roof to descend to a position at least 75 mm (3 inch)above internal accessories or roof seal mechanism. The higher positionshall provide a 2 m (79 inch) clearance between the lowest portion of theroof and the tank floor.

C.3.10.5 Bearing plates shall be provided under all support legs so as to distributethe weight of the internal floating roof on the tank bottom plates and toavoid damage to internal tank coatings. The bearing plates shall be twicethe diameter of the support section, 12.7 mm (1/2 inch) thick, and shall

be attached to the bottom by 4.8 mm (3/16 inch) continuous fillet welds.

C.3.11 Roof Manholes

Roof manholes shall be provided in accordance with AB-036003 .C.3.13 Seals

(Exceptions)

1) If the sealing device employs steel shoes in contact with the shell(pantograph-type), such shoes shall be made of only Type 304stainless steel with a minimum nominal thickness of 1.5 mm (16gauge).

A low-density polymer type plastic insulation cover shall be

provided at the joint between the middle arm of the pantographhanger and the connecting rod of the steel shoe. The insulationcover shall have a press-type locking system and completelyelectrically insulate the pantograph hanger with the seal shoe.

2) Any fabric or non-metallic materials used as a seal or sealcomponent shall be selected based on the design temperature,flammability, permeability, abrasion resistance, aging, resistanceto aromatics, and chemical resistance, and selected from thefollowing Table.

8/13/2019 100-YER-PE-YSS-0438

27/36



Page 25 of 34

Seal Materials Table

Fluid Stored Non-Metallic Seal Material

Crude Oil Viton GF (FKM-GF) Aflas (TFE/P)

Viton (FKM)Refined Products PFA(Perfluoroalkoxy)

PTFE(Teflon) laminatePTFE (Teflon) laminate

Gasoline/MTBE Blend KALREZ (Perfluoroelastomer)CHEMRAZ (Perfluoroelastomer)

KALREZ (Perfluoroelastomer)MTBE (100%) CHEMRAZ (Perfluoroelastomer)

PTFE (Teflon) laminate

Materials properties verification shall be performed by anindependent laboratory.

3) The Tank Manufacturer may offer an alternate design and materialat the time of proposal. However, the alternate design shall complywith the following requirements:

a) Seals shall be located on the skirt.

b) Materials for non-metallic components of seals shall meetrequirements in paragraph C3.13 (2) of this specification.

4) All fabric or non-metallic materials used as a seal or sealcomponent shall have a flammability spread index not exceeding25 established per NFPA 255.

5) All fasteners used in sealing devices shall be Type 304 stainlesssteel.

6) Design of secondary seals shall permit the inspection of primaryseals without removal of the secondary seals.

7) Fabric seal in sealing devices that employ steel shoes in contact

with the shell may be installed after the hydrostatic test.C.3.14 Gauging devices shall be provided per paragraph 3.8.15 of this

specification.

C.3.15 Bonding Shunts

8/13/2019 100-YER-PE-YSS-0438

28/36



Page 26 of 34

Bonding shunts shall be provided on floating roofs in accordance withSASD AB-036387 and API RP 2003 requirements.

8/13/2019 100-YER-PE-YSS-0438

29/36



Page 27 of 34

Appendix G Structurally Supported Aluminum Dome Roofs

G.1 General

G.1.4 Special features

G.1.4.2 (Exception) The aluminum dome roof materials shall have a mill finish.

G.2 Materials

G.2.1 General

(Exception) Materials for all roof components shall be compatible with

the intended service. Alternate material for any roof component(structural frame, roof panels, node covers, bolts, fasteners, sealant andgasket material, and skylight panels) shall not be used without priorapproval of the Saudi Aramco Engineer, as defined in Section 3 of thisspecification.

G.2.3 Roof Panels

(Exception) Roof panels and node covers shall be fabricated from Series3000 (H32 or H34 temper) or 5000(H32 or H34 temper) aluminum witha minimum nominal thickness of 1.2 mm (0.05 in.).

G.2.4 Bolts and Fasteners

(Exceptions)

Bolts and fasteners shall be of 7075-T73 aluminum, 2024-T4aluminum, or 300 Series stainless steel (AISI 302 or AISI 304).Only 300 Series stainless steel (AISI 302 or AISI 304) bolts shall beused to attach aluminum to steel.

400 Series stainless steel or aluminized mild steel HV-Huck-Lock bolts shall be used for joining structural members (struts) at the space

truss nodes.G.5 Roof Attachment

G.5.3 Separation of carbon Steel and Aluminum

(Exception) Aluminum shall be isolated from carbon steel by austeniticstainless steel spacers.

8/13/2019 100-YER-PE-YSS-0438

30/36



Page 28 of 34

G.5.5 The dome surface paneling shall be designed as a watertight systemunder all design load and temperature conditions. All edges of aluminum

panels shall be covered, sealed, and firmly clamped with batten in aninterlocking manner to prevent slipping or disengagement under all loadand temperature conditions.

G.8 Roof Vents

G.8.4.3 Surface appurtenances and closure panel joints shall be designedwatertight without the use of sealants.

G.10 Testing

G.10.2 100% liquid penetrant examinations shall be performed on structuralwelds and components joined by welding.

G.11 Fabrication and Erection

G.11.5 Erection

(Exception) Structural frame members (struts) shall be joined at nodes by preset-torque level HV-HUCK-Lock bolts.

G.11.6 Workmanship

(Exception) Sealant shall be applied and installed in a manner suitable tothat of architectural class work. Joint surfaces shall be clean to ensureadhesion of sealants. All exposed sealant surfaces shall be tooled slightlyconcave after sealant is placed in joints. Misplaced excess sealant shall

be removed.

8/13/2019 100-YER-PE-YSS-0438

31/36



Page 29 of 34

Appendix H - Internal Floating Roofs

H.1 Scope

(Exception) Types of internal floating roofs are limited to those specifiedin paragraph H.2.2 of this specification. Other types stipulated orreferenced in API 650, Appendix H shall not be considered.

H.2 Types

H.2.1 (Exception) The internal floating roof shall be selected by the designengineer.

H.2.2 (Exception) Only type c(metallic pontoon roofs), type d(metallic double-deck roofs) or type e(metallic roofs on floats) shall be used.

H.3 Material

H.3.1 (Exception) The Design Engineer shall specify the materials required.

Internal floating roofs with non-metallic components as part of the floatsare prohibited.

H.3.2 Steel

(Exception) Galvanized components shall not be used.

H.3.3 Aluminum

(Exceptions)

Aluminum shall not be used in services where caustic constituents are present in the stored liquid.

Delete reference to sandwich panel type.

H.4 Requirements for All Types

H.4.1 General

H.4.1.6 (Exception)

H.4.1.6.1 A minimum of four anti-static stranded stainless steel cables of minimum3 mm in diameter, uniformly distributed, shall be provided from the

8/13/2019 100-YER-PE-YSS-0438

32/36



Page 30 of 34

fixed roof to the internal floating roof. Design of the cables shall takeinto account strength, flexibility, joint reliability and service life.

H.4.1.6.2 All moveable cover accessories (hatches, manways, pressure reliefdevices and other openings) on the internal floating roof shall be bondedto the internal floating roof to prevent static electricity sparking whenthey are opened. The cable shall be minimum 3.2 mm (1/8) in diameterof stranded stainless steel, with a length at least twice the normal travelof these device covers. Design of the cables shall take into accountstrength, flexibility, joint reliability and service life.

H.4.1.8 (Exceptions)

All closed floating compartments shall be seal welded to prevent liquid

or vapor entry.Delete reference to floating roof type H.2.2.g.

H.4.1.9 Delete this paragraph.

H.4.1.10 (Exception) Drains for decks surfaces above the liquid level shall bedesigned to return any spillage or condensate to the product. Such drainsshall close automatically or extended at least 100 mm (4 in.) into the

product to minimize vapor loss.

H.4.2 INTERNAL FLOATING ROOF DESIGN

H.4.2.4 Delete reference to floating roof type H.2.2.g.

H.4.3 JOINT DESIGN

H.4.3.3 (Exception) Pivot joints that allow flexure between adjacent floats shall be provided on internal floating roof designs that employ a metallic roofon tubular floats.

H.4.3.3.1 (Exception) Only austenitic type stainless steel SS 304 hardware shall beused to join aluminum and/or stainless components to each other or tocarbon steel.

H.4.4 PERIPHERAL SEALS

H.4.4.2 The peripheral seal type and material shall selected by the DesignEngineer.

H4.4.5 Seal Types

(Exceptions)

8/13/2019 100-YER-PE-YSS-0438

33/36



Page 31 of 34

Any fabric or non-metallic materials used as a seal or seal componentshall be selected based on the design temperature, permeability,abrasion resistance, aging, flammability, resistance to aromatics, andchemical resistance, and selected from the table in paragraph C3.13.2of this specification.

Only resilient foam-filled liquid-mounted and vapor-mounted rimseals shall be used.

Circumferential joints in envelope fabric seals shall overlap by atleast 150 mm (6 in.).

Galvanized steel components are prohibited.

All fabric or non-metallic materials used as a seal or seal componentshall have a flammability spread index not exceeding 25 established per NFPA 255.

H4.4.6 Fabric or non-metallic materials used as a seal or seal component shall be tested for their compatibility with the intended service by anindependent laboratory.

H.4.5 ROOF PENETRATIONS

(Exception) All roof penetrations shall be surrounded by a well thatextends at least 100 mm (4 in.) into the stored liquid.

H.4.6 Roof Supports

H.4.6.1 (Exception) The floating roof shall be provided with fixed or adjustablesupports.

H4.6.2 (Exception) The height of the floating roof shall be adjustable to two positions with the tank out of service. The design of the supports shall prevent damage to the fixed roof and floating roof at the tank maximumdesign liquid level.

H.4.6.3 (Exception) .The high (maintenance) of adjustable roof supports positionshall provide a 2 m (79 foot) clearance between the lowest portion of theroof and the tank floor.

H.4.6.4 (Exception) Delete reference to floating roof types H.2.2.a, b and g.

H.4.6.5 (Exception) Drainable pipe supports shall be used.

8/13/2019 100-YER-PE-YSS-0438

34/36



Page 32 of 34

H.4.6.6 (Exception) Steel bearing plates shall be provided under all support legsso as to distribute the weight of the internal floating roof on the tank

bottom plates and to avoid damage to internal tank coatings. The bearing plates shall be twice the diameter of the support section,12.7 mm ( inch) thick, and shall be attached to the bottom by 4.8 mm(3/16 inch) continuous fillet welds.

H.4.6.9 Where propeller-type mixers are used, the support legs shall provide aminimum clearance of 300 mm (12 inch) from the underside of theinternal floating roof to the top of the mixer paddle(s).

H.4.6.10 Jet-nozzle mixers are not permitted.

H.5 OPENINGS AND APPURTENANCES

H.5.2 Vents

H.5.2.1 Pressure-Vacuum (Bleeder) Vents

(Exception) As a minimum, two overpressure/vacuum bleeder type ventsshall be installed in the internal floating roof. Vents shall be sized tohandle a total of 125% of the maximum filling/withdrawal rates that arespecified on the Storage Tank Data Sheet.

Commentary Note:

Bleeder vents shall be designed to open and close automatically whenthe roof is 75 mm (3 inch) above its low support legs position uponemptying and filling the tank, respectively.

H.5.2.2 Tank Circulation Vents

H5.2.2.1 (Exception) Peripheral circulation vents shall be located at the top of theshell with an outward projecting cover. Air intake shall be from thecover bottom side to minimize dust ingress.

H.5.2.2.4 Circulation venting and venting devices shall provide protection againstoverpressure/vacuum for normal conditions (resulting from operationalrequirements and atmospheric changes) and emergency conditions(resulting from exposure to an external fire) according to API STD 2000.

H5.2.3 Vents for protection against overpressure/vacuum, while the roof isfloating, shall be provided as follows:

1) Vents shall be sized according to API STD 2000 requirements,considering 25% of the filling/emptying rates and 100% of thermal

breathing.

8/13/2019 100-YER-PE-YSS-0438

35/36



Page 33 of 34

2) Vents shall be evenly distributed and close to the roof edge withenough vents shall be provided close to the inlet diffuser in serviceswhere gas slugs are expected.

3) Vents shall be designed so as not to allow any carry over of storedliquid onto the floating roof.

Commentary Note:

Anticipated operation upset conditions such as an increase intemperature of the input stream to a tank or chemical injection that willresult in vaporization beyond that associated with the product true vaporpressure design limit of 90 kPa absolute (13 psia) or gas purges shall bealso considered in determining the required venting capacity.

H.5.5.3 Inspection Hatches

(Exception) Inspection hatches shall be located on the fixed roof to permit visual inspection of the seal region.

H.5.6 Inlet Diffuser

(Exception) Inlet diffuser shall be specified according to paragraph3.8.12 of this specification.

H5.7 Gauging And Sampling Devices

(Exception) Internal floating roofs shall be provided with gauging andsampling devices when specified by the Design Engineer.

H.6 Fabrication, Erection, Welding, Inspection, and Testing

H.6.4 (Exception) Floatation test and initial fill inspection shall be performed by the erector and witnessed by the purchaser.

H.6.4.1 (Exception) delete reference to floating roof types H.2.2.a, b, g and f.

H.6.4.3 (Exception) Potable water having less than 500 ppm chlorides shall beused for testing when the internal floating roof is constructed ofaluminum or stainless steel.

H.6.5 Internal floating roof components that are fabricated or attached bywelding, such as clips, gusset plates, etc., shall be completely seal-welded.

H.6.6 Shop Fabrication

8/13/2019 100-YER-PE-YSS-0438

36/36



H.6.6.1 Straightening of material shall be done by pressing or other non-injuriousmethods before the material is laid out or worked on in any way.Materials shall not be hammered.

H.6.6.2 When the edges of plates are cut with a torch, the resulting surface shall be uniform, smooth, and free from scale and slag before performing anywelding.

H.6.7 Shop Inspection and Testing

H.6.7.1 Internal floating roofs manufactured in accordance with this specificationare subject to verification by the Saudi Aramco Inspector in accordancewith Saudi Aramco Inspection Requirements Form 175-324900.

H.6.7.2 Inspection at the mill, shop, or fabrication yard shall not release themanufacturer of the internal floating roof from responsibility forrepairing or replacing any defective material or workmanship that may

be subsequently discovered in the field.

H.6.7.3 All support brackets that are welded to tubular pontoons shall be dye- penetrant inspected.

H.6.7.4 Welded tubular pontoons shall be pneumatically pressure tested with airat 35 kPa (5 psig) and the welds visually inspected by using a soapywater solution or by immersing the pontoons under water. All defectivewelds shall be repaired and the pontoons re-tested prior to shipment.

H.7 Installation

H.7.1 Internal floating roofs shall be installed by contractors who have beenapproved by the manufacturer of the internal floating roofs.

H.7.2 Internal floating roofs shall be installed in accordance with the procedures specified by the internal floating roof manufacturer.

H.8 Drawings and Calculations

The internal floating roof manufacturer shall prepare drawings,

calculations, and data in accordance with Form NMR-7918-2, Nonmaterial Requirements. Drawings and calculations that are approved by the Design Engineer shall not relieve the internal floating roofmanufacturer of the responsibility to comply with API STD 650 and thisspecification.

100-yer-pe-yss-0438

Documents