Materials System Specification
12-SAMSS-018 31 October, 2004
Structural Plates, Rolled Shapes and
Tubulars Specification for Fixed Offshore Platforms
Materials and Corrosion Control Standards Committee Members
Al-Anezi, Mohammed A., Chairman
Al-Rumaih, Abdullah M., Vice Chairman
Abdulhadi, Abdullatif I.
Al-Anizi, Salamah S.
Al-Gahtani, Moraya S.
Al-Ghasham, Tawfiq Y.
Al-Ismail, Abdulmajid A.
Al-Mugbel, Wajdi M.
Al-Nabulsi, Khalid M.
Al-Sannaa, Muhsen S.
Balhareth, Nasser M.
Bash, Fahad M.
Burgess, Brian W.
Choi, Ho J.
Cruz, Ivan C.
Dias, Olavo C.
Jones, Stan B.
Kermad, Abdelhak
Lobley, Graham R.
Mehdi, Mauyed S.
Moore, Mark A.
Morrow, Michael J.
Palmer, Robert E.
Stark, Gregory D.
Tems, Robin D.
Saudi Aramco DeskTop Standards
Table of Contents
1 Scope............................................................. 2
2 Conflicts and Deviations................................. 2
3 References..................................................... 2
4 Steel............................................................... 3
5 Tolerances...................................................... 8
6 Quality Requirements..................................... 8
7 Material Marking............................................. 8
8 Material Selection and
Testing Subcommittee.......................... 10
Previous Issue: 28 January, 2004 Next Planned Update: 1 November, 2009
Revised paragraphs are indicated in the right margin Page 1 of 11
Primary contact: Mohammed A. Al-Anezi on 874-6122
Document Responsibility: Materials and Corrosion Control 12-SAMSS-018
Issue Date: 31 October, 2004 Structural Plates, Rolled Shapes and
Next Planned Update: 1 November, 2009 Tubulars Specification for Fixed Offshore Platforms
1 Scope
1.1 This specification defines the minimum requirements for the manufacture and
supply of carbon steel plates, rolled shapes, and tubulars to be used in the
fabrication of fixed offshore platforms as defined in API RP 2A-WSD (20th
Edition).
1.2 Additional requirements may be contained in Scopes of Work, Drawings, or
other Instructions or Specifications pertaining to specific items of work.
1.3 This entire standard may be attached to and made a part of purchase orders.
2 Conflicts and Deviations
2.1 Any conflicts between this specification and other applicable Saudi Aramco
Materials System Specifications (SAMSSs), Engineering Standards (SAESs),
Standard Drawings (SASDs), or industry standards, codes, and forms shall be
resolved in writing by the company or buyer representative through the
Manager, Consulting Services Department of Saudi Aramco, Dhahran.
2.2 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.
2.3 Whenever material requirements are specified, the Vendor may propose, in his
bid, equivalent materials with technical proof that the proposed alternative
material specifications fully meet the technical and environmental requirements,
for consideration by the Buyer.
3 References
The selection of material covered by this specification shall comply with the latest
edition of the references listed below, unless otherwise noted.
3.1 Saudi Aramco References
Saudi Aramco Engineering Procedure
SAES-M-005 Design and Construction of Fixed Offshore
Platforms
SAEP-302 Instructions for Obtaining a Waiver of a
Mandatory Saudi Aramco Engineering
Requirement
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Document Responsibility: Materials and Corrosion Control 12-SAMSS-018
Issue Date: 31 October, 2004 Structural Plates, Rolled Shapes and
Next Planned Update: 1 November, 2009 Tubulars Specification for Fixed Offshore Platforms
Saudi Aramco Materials System Specification
12-SAMSS-005 Marking of Metal Products
Saudi Aramco Inspection Requirement
Form 175-121400 Structural Plates, Rolled Shapes, and Tubulars
Specification for Fixed Offshore Platforms
3.2 Industry Codes and Standards
American Petroleum Institute
API RP 2A-WSD Planning, Designing and Constructing Fixed
Offshore Platforms(20th Edition)
API SPEC 2B Specification for the Fabrication of Structural
Steel Pipe
API SPEC 2H Specification for Carbon Manganese Steel Plate
for Offshore Platform Tubular Joints
API SPEC 2W Specification for Steel Plates for Offshore
Structures Produced by Thermo-Mechanical
Control Processing (TMCP)
API SPEC 5L Specification for Line Pipe
American Society for Testing and Materials
ASTM A6 General Requirements for Delivery of Structural
Steel
ASTM A370 Mechanical Testing of Steel Products
ASTM A673 Sampling Procedure for Impact Testing of
Structural Steel
ASTM E23 Notch Bar Testing of Metallic Materials
4 Steel
The structural steel specifications for plates, rolled shapes and tubulars shall conform to
those listed in API RP 2A-WSD Table 8.1.4-1, Table 8.1.4-2 and Table 8.2.1-1 as
Group I or Group II. Group III steels shall not be used. All steels shall be killed or
semi-killed.
4.1 The "Service Classification" of steel shall be as defined in SAES-M-005 or the
purchase order.
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Document Responsibility: Materials and Corrosion Control 12-SAMSS-018
Issue Date: 31 October, 2004 Structural Plates, Rolled Shapes and
Next Planned Update: 1 November, 2009 Tubulars Specification for Fixed Offshore Platforms
• Steel shall be classified into three types with respect to its use in service as
follows:
Critical Service: Steel selected for members essential to the overall
integrity of the structure and subject to particular precipitous stress
conditions.
Primary Service: Steel selected for members participating in the overall
integrity of the structure, and for other structural members of importance for
the operational safety.
General Service: Steel selected for structural members other than critical or
primary structural steel members.
PL1 - Critical service plates with tested through-thickness properties
PL2 - Primary service plates with improved (but not tested) through-
thickness properties
PL4 - General service plates
SH2 - Primary service rolled shapes with improved (but not tested)
through-thickness properties
SH4 - General service rolled shapes
RT1 - Rolled tubulars from PL1 material (critical service plates with tested
through-thickness properties)
RT2 - Rolled tubulars from PL2 material (primary service plates with
improved but not tested through-thickness properties)
RT4 - Rolled tubulars from PL4 material (general service plates)
T2 - Pipe material for primary service, high strength (X52 grade)
T3 - Pipe material for general service, high strength (X52 grade)
T4 - Pipe material for general service, normal strength (Grade B, X42 or
X52)
4.2 Material Requirements
Chemical, mechanical and notch toughness properties of each class of steel will
be in accordance with the material requirements of this section
Page 4 of 11
Document Responsibility: Materials and Corrosion Control 12-SAMSS-018
Issue Date: 31 October, 2004 Structural Plates, Rolled Shapes and
Next Planned Update: 1 November, 2009 Tubulars Specification for Fixed Offshore Platforms
Use of wall thickness in excess of that given in the drawings and outside of the
dimensional tolerances for the given product is not permitted without written
approval from Saudi Aramco.
The following restrictions shall apply to the use of API SPEC 2W materials:
a) Heating or hot forming exceeding 200°C shall not be used in fabrication
b) The thickness shall not exceed 65 mm.
c) The yield strength/tensile strength ratio shall not exceed 0.85
4.2.1 PL1 Plates and RT1 Tubulars
The PL1 plates and RT1 tubulars shall conform to API SPEC 2H Grade
42 or Grade 50 or API SPEC 2W Grade 42, 50 or 50T with the following
supplementary requirements. The supplementary requirements are listed
below. S1 through S7, are as defined in API SPEC 2H or 2W as
appropriate.
a) S1- UT testing
b) S3- individual plate testing
c) S4- through-thickness testing for material over 19mm in thickness.
d) S5- low Sulphur
e) S7- low Nitrogen
f) Vanadium and Boron shall not be intentionally added. A chemical
analysis will be performed and amounts of Vanadium and Boron
shall be reported. The residual Boron content shall not exceed
0.0005%
g) The CE shall be 0.40% maximum
h) RT1 tubulars shall meet the general requirements of the
API SPEC 2B
i) Welding Procedures for RT1 Tubulars shall include impact testing
in accordance with API SPEC 2B SR4
4.2.2 PL2 Plates and RT2 Tubulars
The PL2 plates and RT2 tubulars shall conform to API SPEC 2H Grade
42 or Grade 50, or API SPEC 2W Grade 42, 50 or 50T with the
following supplementary requirements. The supplementary
requirements are listed below. S1 through S7, are as defined in API
SPEC 2H or 2W as appropriate.
a) S5- low Sulphur
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Document Responsibility: Materials and Corrosion Control 12-SAMSS-018
Issue Date: 31 October, 2004 Structural Plates, Rolled Shapes and
Next Planned Update: 1 November, 2009 Tubulars Specification for Fixed Offshore Platforms
b) S7- low Nitrogen
c) Vanadium and Boron shall not be intentionally added. These
elements shall be analyzed for and reported. The residual Boron
content shall not exceed 0.0005%.
d) The CE shall be 0.40% maximum
e) RT2 tubulars shall meet the general requirements of the
API SPEC 2B
f) Welding Procedures for RT2 Tubulars shall include impact testing
in accordance with API SPEC 2B SR4
4.2.3 PL4 Plates and RT4 Tubulars
The PL4 plates and RT4 tubulars shall conform to any material listed in
API RP 2A for Group I and Group II with the following supplementary
requirements:
a) The CE shall be 0.45% maximum
b) Any material with a wall thickness greater than 13 mm shall be
impact tested on a heat basis and shall conform to Table 1
c) RT4 tubulars shall meet the general requirements of the
API SPEC 2B
d) T4 tubulars which meet the above requirements may be substituted
for RT4 tubulars
e) Welding Procedures for RT4 Tubulars greater than 13 mm
thickness shall include impact testing in accordance with
API SPEC 2B SR4
4.2.4 SH2 Shapes
The SH2 shapes shall conform to any material listed in API RP-2A for
Group I and Group II with the following supplementary requirements:
a) The maximum Sulphur content shall not exceed 0.010 %
b) The maximum CE shall be 0.40%
c) Any material with a flange thickness greater than 13 mm shall be
impact tested on a heat basis and shall conform to Table 1
4.2.5 SH4 Shapes
The SH4 shapes shall conform to any material listed in API RP-2A for
Group I and Group II with the following supplementary requirements:
Page 6 of 11
Document Responsibility: Materials and Corrosion Control 12-SAMSS-018
Issue Date: 31 October, 2004 Structural Plates, Rolled Shapes and
Next Planned Update: 1 November, 2009 Tubulars Specification for Fixed Offshore Platforms
a) The maximum CE shall be 0.45%
b) Any material with a flange thickness greater than 13 mm shall be
impact tested on a heat basis and shall conform to Table 1
4.2.6 T2 Pipe
The T2 pipe shall conform to API SPEC 5L Grade X52 with the
following supplementary requirements:
a) The maximum wall thickness shall not exceed 38 mm
b) API SPEC 5L Supplementary Requirement SR5B-40M18 shall be
applied (Impact tests at -18°C, 40J minimum average, 30J
minimum single value)
c) The maximum CE shall be 0.42%
d) Only seamless or longitudinal seam welded pipe using SAW
(Submerged Arc Welding) is permitted
e) Hydrotest and API SPEC 5L monogram are not required
4.2.7 T3 Pipe
The T3 pipe shall conform to API SPEC 5L Grade X52 with the
following supplementary requirements:
a) The maximum wall thickness shall not exceed 38 mm
b) The maximum CE shall be 0.42%
c) Only seamless or longitudinal seam welded pipe using SAW is
permitted
d) Hydrotest and API SPEC 5L monogram are not required
4.2.8 T4 Pipe
The T4 pipe shall conform to API SPEC 5L Grade B or X42 with the
following supplementary requirements:
a) The maximum wall thickness shall not exceed 38 mm
b) The maximum CE shall be 0.45%
c) Seamless, Electric resistance welded pipe (manufactured to
01-SAMSS-332) or longitudinal seam welded pipe using SAW
(Submerged Arc Welding) are permitted
d) Hydrotest and API SPEC 5L monogram are not required
Page 7 of 11
Document Responsibility: Materials and Corrosion Control 12-SAMSS-018
Issue Date: 31 October, 2004 Structural Plates, Rolled Shapes and
Next Planned Update: 1 November, 2009 Tubulars Specification for Fixed Offshore Platforms
Table 1 – Impact Testing Requirements
Impact Test CVN Absorbed Energy
Steel Group Steel Class Temperature Average Minimum
of three Single Value
I C -18°C 27J (20 ft-lb) 20J (15 ft-lb)
I B -18°C 27J (20 ft-lb) 20J (15 ft-lb)
I A -29°C 27J (20 ft-lb) 20J (15 ft-lb)
II C -18°C 27J (20 ft-lb) 20J (15 ft-lb)
II B -29°C 34J (25 ft-lb) 27J (20 ft-lb)
II A -40°C 34J (25 ft-lb) 27J (20 ft-lb)
Notes:
∗ All tests to be performed in accordance with ASTM A673, ASTM A370, and ASTM E23
∗∗ Steel Class definition as per API RP 2A
∗∗∗ Full size (10 mm x 10 mm) Charpy impact test specimens shall be used.
5 Tolerances
The "as-rolled" permissible variations for all rolled shapes and plates shall be as
specified in ASTM A6, Section 13.3.2.
The dimensions and tolerances for structural pipes T2, T3, and T4 shall be as specified
in the API SPEC 2B. All the pipe ends shall be as specified in the Purchase Order. If
specified, beveled ends shall have end protectors.
6 Quality Requirements
The Vendor shall implement and maintain a Quality Program which shall include
clearly defined and documented procedures for the relevant quality system functions.
The Vendor shall make the Quality Program available to the Buyer's inspection
representative for review and audit.
The items manufactured to this Specification are subject to verification by the Buyer's
inspection representative per the Purchase Order and Saudi Aramco Inspection
Requirement Form SA-175 Code No. 121400 attached to the Purchase Order.
7 Material Marking
Markings shall be in Accordance with 12-SAMSS-005, "Marking of Metal Products."
Specifically, the following requirements shall be adhered to:
Page 8 of 11
Document Responsibility: Materials and Corrosion Control 12-SAMSS-018
Issue Date: 31 October, 2004 Structural Plates, Rolled Shapes and
Next Planned Update: 1 November, 2009 Tubulars Specification for Fixed Offshore Platforms
7.1 Rolled shapes
Each rolled shape length shall be metal stamped (low stress stamp) and stencil
painted in 25 mm high letters. Stencil painting, highly visible, and stamping
shall include the following:
- Company and Port Designation
- Material Grade
- Heat Number
- Purchase Order Number and Item Number
- Saudi Aramco Stock Number or Job Order Number
- Member size (type) for example W35 x 230
All sections shall be marked at both ends.
The above are minimum marking requirements and additional requirements may
be specified by the Buyer.
7.2 Plates
Each plate shall be metal stamped (low stress stamp) and stencil painted in 25
mm high letters on two diagonally opposite corners of the plate. Stencil painting
and stamping shall include the following:
- Company and Port Designation
- Material Grade
- Heat Number
- Purchase Order Number and Item Number
- Saudi Aramco Stock Number or Job Order Number
- Dimensions (thickness in millimeters and inches in parentheses)
The above are minimum marking requirements and additional requirements may
be specified by the Buyer.
7.3 Tubulars (Structural Pipe)
7.3.1 Marking requirements
Each length of structural pipe shall be marked with the following
information:
- Company and Port Designation
Page 9 of 11
Document Responsibility: Materials and Corrosion Control 12-SAMSS-018
Issue Date: 31 October, 2004 Structural Plates, Rolled Shapes and
Next Planned Update: 1 November, 2009 Tubulars Specification for Fixed Offshore Platforms
- Material Grade
- Heat Number
- Purchase Order Number and Item Number
- Saudi Aramco Stock Number or Job Order Number
- Dimensions (thickness in millimeters and inches in parentheses)
7.3.2 Description of Marking
Each of the marking requirements shall be metal stamped (low stress
stamp) and stencil painted, highly visible, at one end of the pipe:
a) For pipe sections 18 inches in diameter and above the markings
shall be on the inside of the pipe and located approximately 75 mm
from one end.
b) For pipe sections smaller than 18 inches in diameter markings may
be on the outside of the pipe and located approximately 300 mm
from one end.
c) The size of the metal stamped marking shall be 10 mm or larger.
The size of the stencil paint lettering shall be commensurate with
the diameter of the pipe, but in no case less than 25 mm in height.
d) In addition to the detailed marks at one end of the structural pipe,
the purchase order number and SAMS Stock Number (or J.O. No.)
shall be stencil painted inside or outside at the other pipe end and in
the middle of each length.
8 Material Selection and Testing Subcommittee
Graham Lobley Coordinator
Stan Jones Member
Fahad Al-Bash Member
Olavo Dias Member
Muhsen Al-Sannaa Member
Mike Morrow Member
Mauyed Mehdi Member
Nasser Balhareth Member
Khalid Al-Nabulsi Member
Abdulmajid Al-Ismail Member
Page 10 of 11
Document Responsibility: Materials and Corrosion Control 12-SAMSS-018
Issue Date: 31 October, 2004 Structural Plates, Rolled Shapes and
Next Planned Update: 1 November, 2009 Tubulars Specification for Fixed Offshore Platforms
Robin Tems Member
Abdelhak Kermad Member
Brian Burgess Member
Hojin Choi Member
Gregory Stark Member
Abdullah Al-Rumaih Member
Wajdi Al-Mugbel Member
Revision Summary
31 October, 2004 Major revision.
Page 11 of 11
