32-SAMSS-030

Previous Issue: 29 December 2004 Next Planned Update: 4 January 2011 Revised paragraphs are indicated in the right margin of 28 Primary contact: Naffaa, Mahmoud Youniss on 966-3-8747263

Copyright©Saudi Aramco 2005. All rights reserved.

Materials System Specification

32-SAMSS-030 4 January 2006 Manufacture of Small Tanks

Vessels Standards Committee Members Naffaa, Mahmoud Youniss, Chairman Sudairy, Jaralla Ali, Vice Chairman Gahtani, Moraya Saif Kim, Steve Un Anizi, Salamah Salem Niemeyer, Dennis Charles Anezi, Mohammed Ali Sharhan, Ziyad Sharhan Muir, William Rhodes

Saudi Aramco DeskTop Standards Table of Contents 1 Scope............................................................. 2 2 Materials......................................................... 6 3 Design............................................................ 7 4 Fabrication.................................................... 10 5 Inspection and Testing................................. 10 6 Nondestructive Examination......................... 11 7 Documentation............................................. 11 8 Disinfection................................................... 11 9 Shipping Requirements................................ 12 10 Tank Labeling............................................... 13 Appendix I – Supplement to API SPEC 12F...... 14 Appendix II – Supplement to API STD 650 Appendix J............................................ 17 Appendix III – Supplement to UL 142................ 20 Appendix IV – Supplement to UL 1316.............. 26 Appendix V – Supplement to API SPEC 12P..... 28

Document Responsibility: Vessels 32-SAMSS-030 Issue Date: 4 January 2006 Next Planned Update: 4 January 2011 Manufacture of Small Tanks

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1 Scope

1.1 General

1.1.1 This Saudi Aramco Materials System Specification (SAMSS) defines the minimum mandatory requirements governing material, design, fabrication, inspection, and testing of small, atmospheric pressure storage tanks used in production, process plant, bulk plant, building services, fuel dispensing, or community facilities applications.

1.1.2 This specification covers tanks used for the aboveground or underground storage of flammable and combustible liquids. It also covers tanks used for the storage of chemicals or water.

1.1.3 Tanks purchased in accordance with the various industry standards and specifications shall also meet the requirements contained within the body of this specification, plus the supplementary requirements contained in the appendices of this specification as follows.

Standard or Specification Appendix

API SPEC 12F I API STD 650, Appendix J II UL 142 III UL 1316 IV API SPEC 12P V

Appendices are not provided for tanks purchased in accordance with AWWA D100 and AWWA D120.

1.1.4 This specification may be attached to and form an integral part of a purchase order.

1.1.5 Proposals

The Tank Manufacturer may offer an alternative design, but must quote on the base inquiry documents. The proposal shall include a detailed description of any exceptions to the requirements of this specification.

1.2 Compliance

1.2.1 Conflicts and Deviations

1.2.1.1 Any conflict between this specification and other Saudi Aramco Materials System Specifications (SAMSSs), Saudi Aramco Engineering Standards (SAESs), industry codes and


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standards, and Saudi Aramco Standard Drawings (SASDs) and Forms shall be resolved in writing by the Company or Buyer Representative through the Manager, Consulting Services Department of Saudi Aramco, Dhahran.

1.2.1.2 Direct all requests to deviate from this specification in writing to the Company 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.

1.3 Referenced Publications

Materials or equipment supplied to this specification shall comply with the latest edition of the references listed below, unless otherwise noted.

1.3.1 Saudi Aramco References

Saudi Aramco Engineering Procedures

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

SAEP-1142 Qualification of non-Saudi Aramco NDT Personnel

Saudi Aramco Engineering Standards

SAES-H-001 Coating Selection & Application

SAES-W-017 Welding Requirements for Tanks

SAES-X-500 Cathodic Protection of Vessels and Tank Internals

SAES-X-600 Cathodic Protection of Plant Facilities

Saudi Aramco Materials System Specification

09-SAMSS-107 Fluoropolymer/Ceramic Coatings to Fasteners

Saudi Aramco Inspection Requirements

Form 175-325100 Steel Tanks Aboveground or Underground to UL Specifications

Form 175-325200 Fiberglass Tanks Underground to UL Specifications


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Form 175-325300 Fiberglass Tanks Aboveground to AWWA Specifications

Saudi Aramco Forms and Data Sheets

SA 2696-ENG Appurtenance Schedule and Orientations

SA NMR-7918-1 Nonmaterial Requirements for Tanks

Saudi Aramco Standard Drawings

AB-036003 Manholes and Vents for Tanks

AD-036061 Roof Center Vents for Cone-Roof Tanks

AA-036355 Impressed Current Tank Bottom, Cathodic Protection Details

AB-036387 Grounding

1.3.2 Industry Codes and Standards

American Petroleum Institute

API SPEC 12F Specification for Shop Welded Tanks for Storage of Production Liquids

API SPEC 12P Specification for Fiberglass Reinforced Plastic Tanks

API STD 650 Welded Steel Tanks for Oil Storage

API STD 2000 Venting Atmospheric and Low-Pressure Storage Tanks

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

American Society of Civil Engineers

ASCE 7 Minimum Design Loads for Buildings and Other Structures

American Society of Mechanical Engineers

ASME B16.11 Forged Steel Fittings, Socket-Welding and Threaded

American Society of Mechanical Engineers/Boiler and Pressure Vessel Code

ASME SEC V Nondestructive Examination


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American Society for Testing and Materials

ASTM A193 Alloy Steel and Stainless Steel Bolting Materials for High Temperature Services

ASTM A307 Carbon Steel Externally Threaded Standard Fasteners

ASTM D1418 Rubber and Rubber Lattices

American Water Works Association

AWWA C652 Disinfection of Water Storage Facilities

AWWA D100 Welded Steel Tanks for Water Storage

AWWA D120 Thermosetting Fiberglass-Reinforced Plastic Tanks

Military Specifications

MIL C16173 Corrosion Preventive Compound, Solvent Cutback, Cold-Application

National Fire Protection Association

NFPA 68 Guides for Venting of Deflagration

Underwriters Laboratories, Inc.

UL 142 Steel Aboveground Tanks for Flammable and Combustible Liquids

UL 1316 Glass-Fiber-Reinforced Plastic Underground Storage Tanks for Petroleum Products, Alcohols, and Alcohol-Gasoline Mixtures

Process Industry Practices

VEFV1100 Vessel/S&T Heat Exchanger Standard Details

1.4 Definitions

Design Engineer: The Engineering Company responsible for specifying, on the design data sheet, the design requirements for tanks.

Low-Flash Liquids: Hydrocarbon liquids with a flash point equal to or less than 54ºC.

Saudi Aramco Engineer: The Supervisor of Process Equipment Unit, Consulting Services Department, Dhahran.


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Saudi Aramco Inspector: The person or company authorized by the Saudi Aramco Inspection Department to inspect tanks to the requirements of this specification.

Small Tanks: Shop fabricated or field erected atmospheric pressure storage tanks up to 1500 barrels capacity.

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

Flammable liquid: A liquid that has a flash point equal to or less than 54°C.

Combustible Liquid: A liquid that has a flash point greater than 54°C and that is at a temperature lower than 8°C below its flash point.

2 Materials

2.1 General

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

2.1.2 The Tank Manufacturer may propose the use of alternative materials to those that are specified in the relevant industry standard. The alternative materials shall comply with all the other requirements of that standard and this specification. The chemical compositions and mechanical properties of non-ASTM materials shall be submitted for evaluation by the Saudi Aramco Engineer.

2.1.3 Materials proposed by the Tank Manufacturer that are equivalent to those specified in the relevant industry standard shall be approved by the Saudi Aramco Engineer.

2.1.4 All materials shall be clearly identified and provided with supplier test certificates.

2.2 Bolting

2.2.1 Flange bolting material shall conform to ASTM A193 Grade B7 bolts with ASTM A194 Grade 2H nuts except for the following.

1) Low carbon steel machine bolts conforming to ASTM A307 Grade A or B may be used on nonmetallic flanges.

2) Stud bolts conforming to ASTM A193 Grade B7M with ASTM A194 Grade 2HM nuts shall be used when the tank is in wet sour service and buried.


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2.2.2 All bolting shall be coated by fluoropolymer coating per 09-SAMSS-107.

2.3 Gasketing

Gasket materials shall be non-asbestos, conforming to Johns Manville JM 960 or Garlock 3000 except for the following.

1) Synthetic rubber gasket, ASTM D1418 Class CSM, shall be used for all acid services except nitric acid and oleum. For nitric acid and oleum, ASTM D1418 Class FKM elastomer shall be used for flat face flanges or spiral wound Type 304 stainless steel, PTFE filled gaskets shall be used for raised face flanges.

2) Elastomeric material, 3 mm thick with a Shore A Durometer hardness of between 50 and 60, shall be used for full face gaskets for plastic flanges. For wet chlorine service and hypochlorite service the elastomer shall be ASTM D1418 Class CSM.

3 Design

3.1 Design Considerations

3.1.1 Information provided by the Design Engineer on the Storage Tank Data Sheet and a completed Form SA 2696-ENG shall be used for the tank design in accordance with the relevant industry standard and this specification.

3.1.2 Wind and seismic design criteria shall be in accordance with the information provided by the Design Engineer on the Storage Tank Data Sheet.

Aboveground, vertical, cylindrical tanks shall be designed for wind and earthquake loads in accordance with ASCE 7.

3.1.3 Underground tanks shall be designed for soil, traffic and/or buoyancy loads as applicable.

3.2 Openings

The number, size, type, and orientation of nozzles and manholes shall be in accordance with that specified on the Storage Tank Data Sheet.

3.3 Venting

3.3.1 Normal and emergency venting requirements shall be specified in accordance with API STD 2000, SAES-J-600, SASD AB-036003 and AD-036061 and the requirements of this specification.


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3.3.2 Maximum filling and emptying rates specified on the Storage Tank Data Sheet shall be used as a basis for determining the normal venting capacity.

3.3.3 All open vents shall be protected by bird screens.

3.3.4 The need to protect fixed roof tanks against internal deflagration shall be determined by the design engineer according to NFPA 68. The design of deflagration venting shall be submitted to the Chief Fire Prevention Engineer and CSD for review.

3.4 Platforms, Walkways, and Stairways

3.4.1 The type and location of stairway shall be as specified on the Storage Tank Data Sheet and Form SA 2696-ENG.

3.4.2 Platforms, walkways, and stairways shall be fabricated of open grating. Checker-plate grating is not permitted.

3.4.3 Stairways on insulated tanks shall be provided with stringers on both sides.

3.5 Foundations

Aboveground, vertical flat bottom steel tank supported directly on soil foundation shall meet the following requirements:

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

1) Material shall be carbon steel, 3 mm 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 be seal welded.

3) Extend at least 75 mm beyond the outer periphery of the concrete 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 height of the tank shell shall be painted with a 250-300 microns (10-12 mils) thick epoxy coating in accordance with SAES-H-001, APCS-1.

3.5.2 Tank's bottom shall be coated with APCS-3 or APCS-113, as applicable, on its soil side leaving minimum 2.5 cm wide strip of uncoated steel


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along the underside of the floor plate, centered on, and directly below the weld seam. This will typically require masking a strip along the underside of each end (edge) of each bottom plate approximately 5 cm wide. Cathodic protection for the soil side of tank bottoms shall be provided according to SAES-X-600. APCS-3 shall be specified for tank with maximum operation temperature of 70°C, while APCS-113 shall be specified for higher operation temperatures.

3.5.3 The top fill layer shall be a mixture of sweet sand and cement (33:1 ratio, i.e., 3% cement). The material specifications and mixing requirements shall be as follows:

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

2) The dry sand must be screened through 6 mm mesh (maximum). Care must be taken in using clean mixing and handling equipment to ensure mixture remains free from foreign matter.

3) The sand shall then be thoroughly mixed with cement in a 33:1 ratio by weight in a concrete mixer. After laying the mixture shall be rolled a minimum six times by a 3 ton roller. Vibratory plate tampers may be used in lieu of rollers for areas where a roller cannot reach and/or cover.

3.5.4 Under Tank Leak Detection and Sub-grade Protection

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

3.5.4.2 Flexible membrane liner of minimum 1000 microns (40 mils) thickness compatible with the stored product shall be specified under the tank bottom. The liner shall be placed according to SASD AA-036355, extending to the internal top edge of the ring foundation.

3.5.4.3 Joints in the liner shall satisfy the leak tightness, permeability, and chemical resistance requirements for the liner material.

3.5.4.4 Alternative under-tank leak detection and sub-grade protection systems shall not be permitted without the prior approval of the Saudi Aramco Engineer.


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4 Fabrication

4.1 General

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

4.2 Marking

4.2.1 Marking shall be done with water soluble materials that contain no substances that would attack or harmfully affect the tank at both ambient and operating temperature.

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

4.2.3 Export packaging, marking, and shipping shall be in accordance with the purchase order.

4.3 The soil side of the bottom plates shall be cleaned of all foreign matter and grit-blast cleaned prior to being coated and placed in position for welding. The topside surface of bottom plates that are not internally coated shall also be grit-blast cleaned prior to welding. Surface preparation shall be according to APCS-3 or APCS-113, as applicable.

5 Inspection and Testing

5.1 Inspection

5.1.1 Inspection shall be in accordance with Saudi Aramco Inspection Requirements Forms 175-325100, 175-325200, and, 175-325300 the relevant industry standard, this specification and the following additional requirements.

5.1.2 Saudi Aramco shall have the right to inspect the fabrication at any state and to reject material or workmanship, which does not conform to the specified requirements.

5.1.3 Inspection procedures shall be established in accordance with ASME SEC V. A written procedure for each inspection method and technique, including acceptance criteria to be used, shall be submitted to the Saudi Aramco Inspector for approval. Qualification of the procedure may be required, as determined by the Saudi Aramco Inspector. Inspection procedures in conformance with other standards are acceptable only with the approval of the Saudi Aramco Inspector.


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5.1.4 Written reports and evaluations of all inspections performed shall be submitted to the Saudi Aramco Inspector.

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

5.2 Testing

5.2.1 After completion of all external and internal welding, nondestructive examination, as applicable, and prior to coating, tanks shall be pressure tested using water as the testing media in accordance with the applicable Saudi Aramco Inspection Requirements Forms 175-325100, 175-325200, and, 175-325300, the relevant industry standard and this specification.

5.2.2 Water used for pressure testing shall be potable. For metallic tanks manufactured from stainless steel, the water shall not contain more than 50 ppm chlorides with pH value of 10 to 11 at the time of filling the tank.

6 Nondestructive Examination

6.1 All Non-destructive Testing (NDT) shall be in accordance with the requirements of the relevant industry standard and this specification.

6.2 All NDT shall be done by personnel certified to SAEP-1142 or approved equivalent for the particular method or technique to be used.

7 Documentation

7.1 The Tank Manufacturer shall prepare drawings, calculations, and data in accordance with Form SA NMR-7918-1, Non-Material Requirements.

7.2 Drawings and calculations that are approved by the Design Engineer shall not relieve the Tank Manufacturer of the responsibility to comply with the relevant industry standard and this specification.

7.3 All approved data sheets, drawings and forms are to be submitted to Engineering Drawings Services Division (EDSD) for inclusion into Corporate Drawings Management System.

8 Disinfection

All potable water storage tanks shall be disinfected in accordance with AWWA C652.


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The chlorine and bacteriological tests shall be approved by the Environmental Health Department of Saudi Aramco.

9 Shipping Requirements

9.1 General

9.1.1 Prior to shipping tanks are to be completely and thoroughly dried after testing and cleaned to the satisfaction of the Saudi Aramco Inspector.

9.1.2 The Tank Manufacturer is responsible for ensuring that the tanks which are completely shop fabricated are adequately braced and shall provide temporary supports where appropriate to ensure adequate supporting of the tank during shipment.

9.1.3 Tanks partially shop fabricated and/or liable to suffer distortion during transit and erection shall be suitably braced. All ends that will be open during shipment shall be covered to prevent ingress of dirt and other foreign matters. The Tank Manufacturer shall provide the Saudi Aramco Engineer of the method of protection for review and approval.

9.2 Internal Protection

The following internal protection measures are applicable to metallic tanks only.

9.2.1 Tank internals shall be protected by use of a nontoxic vapor phase corrosion inhibitor such as COTEC VCI-309 or 307 or equivalent, applied at a rate of 100 g/m³. The inhibitor selected must be appropriate for the metallurgy of the tank.

9.2.2 Tanks must be sealed vapor tight using metallic or wooden covers, for inhibitors to be effective.

9.2.3 Alternatively, temporary coatings in accordance with MIL C6173 Grade IV (example Tectyl 846) or equivalent or a vapor proof bag with moisture control may be used.

9.2.4 Temporary coatings for use on stainless steel tanks must be chloride free, suitable for its intended use and not result in crevice corrosion.

9.2.5 Where permanent internal coatings are specified, the Tank Manufacturer shall contact the Saudi Aramco Engineer for any corrosion protection required.

9.3 External Protection


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9.3.1 Solid stainless steel tanks, which are to be shipped via ocean freight, protect using a temporary protective system compatible with stainless steel and suitable for outdoor exposure in accordance with MIL C16173 Grade IV.

9.3.2 Threaded nozzle connections, shall be protected with threaded plugs. However, telltale holes in reinforcing pads shall be protected with wooden plugs or packed with a rust preventative grease such as Denso paste.

9.3.3 Flanged connections and all other machined surfaces shall be protected by a coating such as MIL C16173 Grade IV, which is easily removed in the field and fitted with a steel or wood cover, 3 mm thick and neoprene gaskets.

9.3.4 Covers shall be securely attached by a minimum of four bolts equally spaced. For ocean shipment, flanged connections shall also be covered with heavy duty plastic bags securely taped to the nozzles.

9.3.5 Flanges with permanent blind flanges or covers shall be secured with the gaskets and bolting required for service.

10 Tank Labeling

10.1 For aboveground tanks, the tank number and content shall be painted in both Arabic and English at 180 degree intervals around the tank.

10.2 Marking shall be done with materials containing no substances that would attack or harmfully affect the tank at both ambient and operating temperature.

10.3 For metallic tanks, marking materials shall be free of lead, sulfur, zinc, cadmium, mercury, chlorine, or any other halogens.

Revision Summary 4 January 2006 Major revision.


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Appendix I – Supplement to API SPEC 12F

The following paragraph numbers refer to API SPEC 12F, Eleventh Edition, November 1994, which is part of this specification. The text in each paragraph below is an addition to API SPEC 12F unless it is noted as an exception. Paragraph numbers not appearing in API SPEC 12F are new paragraphs to be inserted in numerical order.

2 Material

2.2 Plates

(Exception) Rimmed and capped steels are not permitted.

2.3 Delete this paragraph.

2.8 Couplings

(Exception) Threaded and socket welded connections shall be in accordance with ASME B16.11.

2.9 Bolting

(Exception) Bolting shall be in accordance with Paragraph 2.2 of this specification.

3 Design

3.6 Type

The tank bottom type shall be in accordance with that specified on the Storage Tank Data Sheet.

3.9 (Exception) The tank bottom shall be attached to the tank shell, if the bottom is flanged by a double-welded butt joint with complete penetration.

3.10 Thickness

The nominal thickness of shell plates shall be 6 mm, including a corrosion allowance of 1.6 mm. Corrosion allowance in excess of 1.6 mm shall be added when specified on the Storage Tank Data Sheet.

3.15 Shell Attachment

3.15.1 For insulated tanks, the design of the deck-to-shell attachment shall prevent the infiltration of rainwater into the insulation.


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3.15.2 The tank deck shall be attached to the tank shell if the deck is flanged by a double-welded butt joint with complete penetration.

3.17 Connections

All connections 3 inch NPS and larger that are used to support piping loads shall be reinforced.

3.20 Anchoring

Anchoring shall be provided as required to prevent tank overturning due to wind loads.

3.21 Grounding

Tanks in hydrocarbon services shall be provided with grounding lugs in accordance with SASD AB-036387 and API RP 2003 requirements.

4 Venting Requirements

(Exception) Normal and emergency venting requirements shall be specified in accordance with paragraph 3.3 of the body of 32-SAMSS-030. Provision of frangible joint at the shell-to-roof juncture is prohibited.

5 Fabrication, Testing, and Painting

5.1 Fabrication

Reinforcing pads and all other external attachment pads shall have rounded corners of minimum 50 mm radius. Pads shall be provided with a 6 mm telltale hole.

5.2 Welding

5.2.1 All welding procedures and procedure qualifications shall be in accordance with SAES-W-017 and be submitted for review by Saudi Aramco.

5.2.2 Weld hardness testing requirements and acceptance criteria shall be in accordance with SAES-W-017.

5.2.3 All structural attachment welds to the tank shell, bottom, deck, and appurtenances shall be continuously seal welded.

5.2.4 All welds shall be free from coarse ripples, undercuts, grooves, overlaps, abrupt ridges and valleys.

5.3 Testing


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5.3.1 The tank shall be tested by filling it with water to 50 mm (2 in.) above the weld connecting the roof plate or compression bar to the top angle or shell.

5.3.2 All reinforcing pads shall be tested by applying pneumatic pressure between the shell and pad and checking for leaks using a soap film. Pneumatic testing pressure, depending on opening diameter and/or shell plate thickness, shall be as follows:

5.3.2.1 For openings with diameter up to and including 20 inches, irrespective of shell plate thickness: 15 psig (103 kPa)

5.3.2.2 For larger openings (normally not exceeding 24 inches):

a) 10 psig (69 kPa) for shell plate thickness less than 3/16 inch or 5 mm.

b) 15 psig (103 kPa) for thicker shell plates.

5.3.3 Upon completion of the test and where it is required to have gas-tight all roof weld joints shall be tested for leakage using the vacuum box method test with a soap solution before any surface coating is applied.

5.6 Coatings and Painting

5.6.1 The type of coating and painting systems to be applied shall be as specified on the Storage Tank Data Sheet.

5.6.2 Prior to coating or painting, internal and external surfaces shall be cleaned to remove all scale, rust, grease dirt, weld spatter and foreign objects.

5.6.3 Gasket contact surfaces shall not be coated or painted.

6 Markings

All tanks with internal coatings shall have the Saudi Aramco's Approved Protective Coating Specification number (APCS number) marked on the nameplate.


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Appendix II – Supplement to API STD 650 Appendix J

The following paragraph numbers refer to API STD 650 Appendix J, Tenth Edition, November 1998, which is part of this specification. The text in each paragraph below is an addition to API STD 650 Appendix J unless it is noted as an exception. Paragraph numbers not appearing in API STD 650 Appendix J are new paragraphs to be inserted in numerical order.

J.2 Materials

(Exceptions)

a) Bolting shall be in accordance with Paragraph 2 of 32-SAMSS-030.

b) Rimmed and capped steels are not permitted.

J.3 Design

J.3.1 Joints

J.3.1.6 For insulated tanks, the design of the roof-to-shell junction shall prevent the infiltration of rainwater into the insulation.

J.3.3 Shells

(Exception) The nominal thickness of shell plates shall not be less than 6 mm, including a corrosion allowance of 1.6 mm. Corrosion allowance in excess of 1.6 mm shall be added when specified on the Storage Tank Data Sheet.

J.3.5 Roofs

J.3.5.1 General

J.3.5.1 (Exception) Roof plate lap joints shall have a minimum of 25 mm overlap.

J.3.5.5 When an internal coating is specified, the roof lap joints shall be continuously welded on both sides.

J.3.6 Tank Connections and Appurtenances

J.3.6.3 Threaded Connections

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


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J.3.6.4 Grounding

Tanks in hydrocarbon services shall be provided with grounding lugs in accordance with SASD AB-036387 and API RP 2003 requirements.

J.3.10 Venting

Normal and emergency venting requirements shall be specified in accordance with paragraph 3.3 of the body of 32-SAMSS-030. Provision of frangible joint at the shell-to-roof juncture is prohibited.

J.4 Fabrication and Construction

J.4.1.4 Shaping of Shell Plates

Reinforcing pads and all other external attachment pads shall have rounded corners of minimum 50 mm radius. Pads shall be provided with a 6 mm tapped hole.

J.4.2 Testing, Repairs, and Inspection

J.4.2.2 Testing

The tank shall be tested by filling it with water to 50 mm (2 in.) above the weld connecting the roof plate or compression bar to the top angle or shell. All reinforcing pads shall be tested by applying a pressure up to 103 kPa (15 psig) pneumatic pressure between the shell and pad and checking for leaks using a soap film. Upon completion of the test, all roof weld joints shall be tested for leakage using the vacuum box method test with a soap solution.

J.6 Welding Procedure and Welder Qualifications

J.6.1 All welding procedures and procedure qualifications shall be in accordance with SAES-W-017 and be submitted for review by Saudi Aramco.

J.6.2 Weld hardness testing requirements and acceptance criteria shall be in accordance with SAES-W-017.

J.6.3 All structural attachment welds to the tank shell, bottom, roof, and appurtenances shall be continuously seal welded.

J.6.4 All welds shall be free from coarse ripples, undercuts, grooves, overlaps, abrupt ridges and valleys.


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J.7 Marking

All tanks with internal coatings shall have the Saudi Aramco's Approved Protective Coating Specification number (APCS number) marked on the nameplate.

J.8 Non-destructive Testing Procedures

J.8.1 Personnel responsible for or affecting the results of Non-destructive Testing (NDT) shall be certified at least Level II In the method being used.

J.8.2 Radiographic Standards

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

J.9 Coatings and Painting

J.9.1 The type of coating and painting systems to be applied shall be as specified on the Storage Tank Data Sheet.

J.9.2 Prior to coating or painting, internal and external surfaces shall be cleaned to remove all scale, rust, grease dirt, weld spatter and foreign objects.

J.9.3 Application of primers prior to hydrostatic testing is acceptable.

J.9.4 Gasket contact surfaces shall not be coated or painted.


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Appendix III – Supplement to UL 142

The following paragraph numbers refer to UL 142, Seventh Edition, April 1993, including revisions through and up to July 1998, which is part of this specification. The text in each paragraph below is an addition to UL 142 unless it is noted as an exception. Paragraph numbers not appearing in UL 142 are new paragraphs to be inserted in numerical order.

1 Scope

1.5 The tank shall be designed for seismic loading in accordance with ASCE 7.

1.8 These requirements cover single wall tanks, secondary containment tanks, multiple compartments single and multiple compartment secondary containment tanks. Multiple wall tanks shall be such that the outer tank is physically separated from the inner primary containment tank by standoffs; where the inner tank is completely contained within the outer tank.

5 Materials

5.2 (Exception) Rimmed and capped steels are not permitted.

6 Construction

6.1 Joints

Figure 6.1 (Exception). Only shell joint numbers 1 and 2 shall be used.

Figure 6.2 (Exception). Only head joint numbers 1 and 2 shall be used.

Figure 6.3 (Exception). Only bottom joint numbers 1 and 5 shall be used.

Figure 6.4 (Exception). Only roof joint numbers 5, 6, 7 and 9 shall be used.

For insulated tanks, the design of the roof-to-shell junction shall prevent the infiltration of rainwater into the insulation.

Figure 6.5 (Exception). Only corner joint numbers 7 through 9 shall be used.

6.2 Reinforcing pads and all other external attachment pads shall have rounded corners of minimum 50 mm radius. Pads shall be provided with a 6 mm tapped hole.


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6.3 All structural attachment welds to the tank shell and appurtenances shall be continuously seal welded.

6.4 All welds shall be free from coarse ripples, undercuts, grooves, overlaps, abrupt ridges and valleys.

6.5 All welding procedures and procedure qualifications shall be in accordance with SAES-W-017 and be submitted for review by Saudi Aramco.

6.6 Weld hardness testing requirements and acceptance criteria shall be in accordance with SAES-W-017.

6.7 Coatings and Painting

6.7.1 The type of coating and painting systems to be applied shall be as specified on the Storage Tank Data Sheet.

6.7.2 Prior to coating or painting, internal and external surfaces shall be cleaned to remove all scale, rust, grease dirt, weld spatter and foreign objects.

6.7.3 Application of primers prior to testing is acceptable.

6.7.4 Gasket contact surfaces shall not be coated or painted.

6.8 Non-destructive Testing

6.8.1 All reinforcing pads shall be tested by applying up to 103 kPa pneumatic pressure between the shell and the pad and checking for leaks using a soap film.

6.8.2 All lap-welded bottom joints in vertical cylindrical tanks shall be tested for leakage by using the vacuum box method test with soap solution before any surface coating is applied.

6.9 Grounding

6.9.1 Vertical tanks in hydrocarbon services shall be provided with grounding lugs in accordance with SASD AB-036387 and API RP 2003 requirements.

6.9.2 Horizontal and rectangular tanks in hydrocarbon services shall be provided with a grounding lug connection welded to the tank support in accordance with PIP VEFV1100.

7 Tank Connections

7.1, 7.2 (Exception) All connections 2 inch NPS and larger shall be attached by full-penetration welds. A fillet weld is acceptable to join the reinforcing pad to


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the nozzle neck and to the shell or roof. All connections 3 inch NPS and larger that are used to support piping loads shall be reinforced.

8 Venting

(Exception) Normal and emergency venting requirements shall be specified in accordance with paragraph 3.3 of the body of 32-SAMSS-030. Provision of frangible joint at the shell-to-roof juncture is prohibited.

11 Painting

11.1 The type of coating and painting systems to be applied shall be as specified on the Storage Tank Data Sheet.

11.2 Prior to coating or painting, internal and external surfaces shall be cleaned to remove all scale, rust, grease, dirt, weld spatter and foreign objects.

11.3 Application of primers prior to hydrostatic testing is acceptable.

11.4 Gasket contact surfaces shall not be coated or painted.

PART I – PRIMARY CONTAINMENT TANKS

HORIZONTAL CYLINDRICAL TANKS

13 Construction

13.2 Steel Thickness

(Exception) In Table 13.1, the minimum thickness for carbon steel tanks shall not be less than 6 mm, and the minimum thickness for stainless steel tanks shall not be less than 4 mm.

13.3 Heads and head joints joint numbers 3 through 6 of Figure 6.1 shall not be used.

13.4 Compartment tank construction

13.4.1 (Exception) Compartment tanks shall be of double-head construction as in detail number 1 in Figure 13.2.

13.4.2 Delete this paragraph.

VERTICAL CYLINDRICAL TANKS

15 Construction


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15.2 Steel Thickness

(Exception) In Table 15.1, the minimum thickness shall be as follows:

Carbon Steel Stainless Steel

Shell 6 mm 4 mm Bottom 6 mm 4 mm Top 4 mm 3 mm

15.3 Tank Top (Roof)

15.3.1 If two or more pieces are required, joints shall be one of the shell joint constructions details 1 or 2 numbers of Figure 1.

15.3.4 Roof plate lap joints shall have a minimum of 25 mm overlap.

15.3.5 When an internal coating is specified, the roof lap joints shall be continuously welded on both sides.

15.4 Tank Bottom (Floor)

15.4.1 (Exception) Bottom plates shall be butt welded in accordance with Figure 6.1, joint number 1 or 2.

15.4.2 Anchoring shall be provided as required to prevent tank overturning due to wind and/or seismic loads.

15.5 Weak Shell-to-Roof Joint Construction.

Provision of weak shell-to-roof joint construction for emergency venting is prohibited.

RECTANGULAR CONSTRUCTION

17.2 The minimum thickness for carbon steel tanks shall not be less than 6 mm, and the minimum thickness for stainless steel tanks shall not be less than 4 mm.

PART II - SECONDARY CONTAINMENT TANKS

ALL SECONDARY CONTAINMENT TANK CONSTRUCTIONS

20 General

20.1 Secondary containment horizontal cylindrical tanks shall comply with the construction requirements for all tanks in Sections 4 – 11 of UL 142 with the exceptions, additions or deletion stipulated in 32-SAMSS-030.


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21.1 The primary containment tank shell and heads of a secondary containment tank shall meet the requirements of Sections 12 and 13 of UL 142 including the exceptions, additions or deletion stipulated in 32-SAMSS-030.

21.2 The outer shell and head of a secondary containment tank shall meet the requirements of Sections 12 and 13 of UL 142 with the exceptions, additions or deletion stipulated in 32-SAMSS-030.


21.6 (Exception) The minimum thickness for the outer carbon steel tanks shall not be less than 6 mm, and the minimum thickness for stainless steel tanks shall not be less than 4 mm.


VERTICAL CYLINDRICAL CONSRUCTIONS

22 General


23.1.1 The primary containment tank shell and heads of a secondary containment tank shall meet the requirements of Sections 14 and 15 of UL 142 including the exceptions, additions or deletion stipulated in 32-SAMSS-030.

23.1.2 The outer shell and head of a secondary containment tank shall meet the requirements of Sections 14 and 15 of UL 142 with the exceptions, additions or deletion stipulated in 32-SAMSS-030.

23.1.4 Delete this paragraph.

RECTANGULAR CONSTRUCTIONS

24 General


25.1 The primary containment tank shell and heads of a secondary containment tank shall meet the requirements of Sections 16 and 17 of UL 142 including the exceptions, additions or deletion stipulated in 32-SAMSS-030.


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25.2 The outer shell and head of a secondary containment tank shall meet the requirements of Sections 16 and 17 of UL 142 with the exceptions, additions or deletion stipulated in 32-SAMSS-030.

39 Tank Leakage Test

39.2 Primary Containment Tanks

39.2.1 The leakage test shall be conducted in accordance with the method described in Paragraph 39.2.1b.

39.2.3 All reinforcing pads shall be tested by applying pneumatic pressure between the shell and pad and checking for leaks using a soap film. Pneumatic testing pressure, depending on opening diameter and/or shell plate thickness, shall be as follows:

a) For openings with diameter up to and including 20 inches, irrespective of shell plate thickness: 15 psig (103 kPa)

b) For larger openings (normally not exceeding 24 inches):

i) 10 psig (69 kPa) for shell plate thickness less than 3/16 inch or 5 mm.

ii) 15 psig (103 kPa) for thicker shell plates.

48 Marking Elements

48.1 All Tanks

48.1.1(f) All tanks with internal coatings shall have the Saudi Aramco's Approved Protective Coating Specification number (APCS number) marked on the nameplate.


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Appendix IV – Supplement to UL 1316

The following paragraph numbers refer to UL 1316, April 2, 1996, which is part of this specification. The text in each paragraph below is an addition to UL 1316 unless it is noted as an exception. Paragraph numbers not appearing in UL 1316 are new paragraphs to be inserted in numerical order.

CONSTRUCTION

3 General

3.3 One piece construction heads shall be only used. Heads shall be either hemispherical or dished. Head radius shall be equal to or less than the head diameter.

3.4 Dished heads shall have a knuckle with a radius equal to or greater than 0.03 times the head diameter, but not less than 1 ½ inch.

3.5 The minimum cylinder wall thickness and minimum head thickness shall be 0.20 in. (5 mm).

3.6 Inside diameter tolerances shall be ± 1 % of nominal inside diameter.

3.7 The cylinder wall of the tank may be tapered but shall not exceed 0.5° per side. The taper, if any, shall be additive to the nominal inside diameter.

3.8 Workmanship

3.8.1 The tank interior surface shall have no non-wetted or exposed reinforcements, no cracks or crazing, and no blisters. Additionally, no pits, surface porosity, pin holes, pores, chips, or scratches greater than 1/16 in. in depth are permitted. Maximum frequency for these visual observations less than 1/16 in. deep shall be less than 20/ft². No voids (entrapped air or bubbles) or encapsulated foreign matter greater than 1/16 in. in depth or greater than ½ in. in diameter are allowed.

3.8.2 The tank exterior surface shall have no cracks, crazes greater than 1 in., blisters greater than ½ in. in diameter, sharp projections, non-wetted or exposed reinforcement. Additionally, no pits, surface porosity, pin holes, chips, scratches, or foreign greater than 1/16 in. in depth are permitted. Maximum frequency for these visual observations less than 1/16 in. deep shall be less than 20/ft². No voids (entrapped air or bubbles) or encapsulated foreign matter greater than 1/16 in. in depth or greater than ½ in. in diameter are allowed.


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3.9 Any tank may be repaired prior to shipment, provided the repaired tank meets all requirements of this specification.

4 Pipe Connections

4.1 Steel threaded fittings shall be in accordance with ASME B16.11.

4.2 All nozzles NPS 3 and larger that are subject to piping loads shall be reinforced.

4.3 For tanks equipped with agitators, the shell shall be reinforced in order to provide sufficient rigidity.

4.4 (Exception) Fitting sizes 1-¼ in and 2-½ in NPS shall not be used

5 Manways

5.3 (Exception) Manways shall be circular and a minimum size of NPS 20.

12 External pressure test

12.2 (Exception) The empty tank shall be subjected to an external hydrostatic pressure as specified in the following table:

Depth of Cover Applied External Water Pressure

Holding Time

Additional Superimposed

Internal Pressure

Holding Time

0-914 ± 76 mm (0–36 ± 3 in)

(D + 914 ± 76) mm of water [(D + 36 ± 3) in of water]

24 hours 18 kPa (5.3 in Hg)

1 minute

> 914 ± 76 mm (0–36 ± 3 in)

(D + H ± 76) mm of water [(D + H ± 3) in of water] Or (D + 914 ± 76) in of water + 9.78 [(H/1000)-0.914]kPa superimposed negative internal pressure [(D + 36 ± 3) in of water + 0.8826 [(H/12)-3] in of Hg]

24 hours 18 kPa (5.3 in Hg)

1 minute

D: Tank Diameter in mm [in] H: Desired depth of cover in mm [in])

15 Earth Load Test

15.2 (Exception) While the tank is still buried, it is to be subjected to a concentrated load of 22,400 lb (10,168 kg) applied to a load-bearing plate 20 by 20 in. (500 by 500 mm) at the top of the cover material.


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Appendix V – Supplement to API SPEC 12P

The following paragraph numbers refer to API SPEC 12P, Second Edition, January 1995, which is part of this specification. The text in each paragraph below is an addition to API SPEC 12P unless it is noted as an exception. Paragraph numbers not appearing in API SPEC 12P are new paragraphs to be inserted in numerical order.

4 Design

4.1 General

4.7 Bottom Strength

The type of tank bottom shall be as specified on the Storage Tank Data Sheet.

4.8 Geometry

The type of deck shall be as specified on the Storage Tank Data Sheet.

4.13 Nozzles

(Exception) Steel threaded connections shall be in accordance with ASME B16.11.

4.20 Wind Load on Tanks (Overturning Stability)

Anchoring shall be provided as required to prevent tank overturning due to wind loads.

4.21 Stiffeners

For tanks equipped with agitators, the shell shall be reinforced in order to provide sufficient rigidity.

4.21.2 All nozzles NPS 3 and larger that are used to support piping loads shall be reinforced.

32-SAMSS-030

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Transcript of 32-SAMSS-030