12-SAMSS-018

Materials System Specification 12-SAMSS-018 14 May 2011 2011 Structural Plates, Rolled Shapes and Tubulars Specification Specification for Fixed Offshore Platforms Document Responsibility: Materials and Corrosion Control Standards Committee

Saudi Aramco DeskTop Standards Table of Contents

1 Scope............................................................. 2 2

Conflicts and Deviations................ Deviations...... ..................... ................. ...... 2

3 References..................................................... 2 4 Steel............................................................... 4 5 Tolerances...................................................... 9 6

Quality Requirements.............. Requirements.... .................... ..................... ............. 9

7

Material Marking.................. Marking............................... ......................... ............ 10

Appendix 1 – Material Substitution..................... 12

Previous Issue: 11 June 2008

Next Planned Update: 11 June 2013 Page 1 of 13

Primary contact: Dennis Niemeyer on 966-3-8760237 Copyright©Saudi Aramco 2011. All rights reserved.

Document Responsibility: Materials and Corrosion Control Issue Date: 14 May 2011 Next Planned Update: 11 June 2013

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12-SAMSS-018 Structural Plates, Rolled Shapes and Tubulars Specification for Fixed Offshore Platforms

Scope 1.1

This specification defines the grades of carbon steel plates, rolled shapes, and tubulars that must be used for the design and construction of a fixed offshore platform in accordance with API RP 2A-WSD. It gives additional minimum requirements for the manufacture and supply of this material. It also gives acceptable substitute materials. Substitute material must still meet the additional requirements given in this specification.

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 standard may be attached to and made a part of purchase orders.

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.

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 SAEP-302

Instructions for Obtaining a Waiver of a Mandatory Saudi Aramco Engineering Requirement Page 2 of 13


SAES-M-005


Design and Construction of Fixed Offshore Platforms

Saudi Aramco Materials System Specifications 01-SAMSS-333

High Frequency Welded Line Pipe

12-SAMSS-005

Marking of Metal Products

Saudi Aramco Inspection Requirement Form 175-121400 3.2

Structural Plates, Rolled Shapes, and Tubulars Specification for Fixed Offshore Platforms

Industry Codes and Standards American Petroleum Institute API RP 2A-WSD

Planning, Designing and Constructing Fixed Offshore Platforms

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

European Standard EN 10225

Weldable Structural Steels for Fixed Offshore Structures

EN10025

Hot Rolled Products of Structural Steels

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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. 

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.



The following are the Service Classifications PL1 -

Critical service plates with tested through-thickness properties

PL2 -

Primary service plates with improved (but not tested) throughthickness 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)

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T4 4.2


Pipe material for general service, normal strength (Grade B, X42 or X52)

Material Requirements Chemical, mechanical and notch toughness properties of each class of steel will be in accordance with the material requirements of this section. Use of wall thickness in excess of that given in the drawings and outside of the dimensional tolerances for the given product is not p ermitted without written approval from Saudi Aramco. 4.2.1

The CE and Pcm will be calculated in accordance with the following: CE = C + (Mn + Si)/6 + (Cr + Mo + V)/5 + (Ni+Cu)/15 Pcm = C + Si/30 + Mn/20 + Cu/20 + Ni/60 + Cr/20 +Mo/15 + V/10 + 5B

4.2.2

The CE requirement will be used if the carbon content is 0.12% or higher. The Pcm requirement will be used if the carbon content is less than or equal to 0.12%.

4.2.3

The yield strength/tensile strength ratio shall not exceed the following for PL1, PL2, RT1 and RT 2 and T2: Yield to Tensile Strength Ratios Grade Normalized Material TMCP Material

4.2.4

4.2.5

Yield to Tensile Strength Ratios Thickness ≤ 16 mm > 16 mm ≤ 16 mm > 16 mm

max. 0.87 0.85 0.93 0.90

The following restrictions shall apply to the use of API SPEC 2W materials: a)

Heating or hot forming exceeding 550°C shall not be used in fabrication

b)

The thickness shall not exceed 75 mm.

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 50 with the following supplementary requirements. The supplementary requirements are listed Page 5 of 13



below. S1 through S7, are as defined in API SPEC 2H or 2W as appropriate. If an approved substitute material is used these requirements must still be met.

4.2.6

a)

S1- UT testing

b)

S3- individual plate testing

c)

S4- through-thickness testing for material over 19 mm 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 maximum CE shall be 0.42% or maximum PCM shall be 0.25% (see 4.2.2)

h)

RT1 tubulars shall meet the general requirements of the API SPEC 2B

i)

Welding Procedures for RT1 Tubulars shall include impact testing at -40°C and meet 34 Joules minimum average and 26 Joules minimum single value in the weld and Heat Affected Zone.

j)

The Yield to tensile strength ratio shall be in accordance with 4.2.3.

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 50 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. If an approved substitute material is used these requirements must still be met. a)

S5- low Sulphur

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)


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4.2.7


e)


f)

Welding Procedures for RT2 Tubulars shall include impact testing at -40°C and meet 34 Joules minimum average and 26 Joules minimum single value in the weld and Heat Affected Zone.

g)


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. If an approved substitute material is used these requirements must still be met.

4.2.8

a)

The maximum CE shall be 0.45%

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)


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 at -18°C and meet 27 Joules minimum average and 20 Joules minimum single value.

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. If an approved substitute material is used these requirements must still be met.

4.2.9

a)

The maximum Sulphur content shall not exceed 0.010%

b)


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.

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. If

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an approved substitute material is used these requirements must still be met: a)


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.

4.2.10 T2 Pipe The T2 pipe shall conform to API SPEC 5L Grade X52 with the following supplementary requirements. If an approved substitute material is used these requirements must still be met.: a)

The maximum wall thickness shall not exceed 38 mm

b)

Impact tests shall be performed at -18°C the acceptance requirement is 40J minimum average, 30J minimum single value)

c)


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.

f)


4.2.11 T3 Pipe The T3 pipe shall conform to API SPEC 5L Grade X52 with the following supplementary requirements. If an approved substitute material is used these requirements must still be met. a)


b)


c)

Only seamless or longitudinal seam welded pipe using SAW is permitted

d)

Hydrotest and API SPEC 5L monogram are not required.

4.2.12 T4 Pipe The T4 pipe shall conform to API SPEC 5L Grade B or X42 or X52 with the following supplementary requirements. If an approved substitute material is used these requirements must still be met.

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a)


b)


c)

Seamless, Electric resistance welded pipe (manufactured to 01-SAMSS-333) or longitudinal seam welded pipe using SAW (Submerged Arc Welding) are permitted

d)

Hydrotest and API SPEC 5L monogram are not required. Table 1 – Impact Testing Requirements CVN Absorbed Energy Average Minimum of three Single Value

Steel Group

Steel Class

Impact Test Temperature

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:

5



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.

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.

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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 175-121400 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: 7.1

Rolled shapes Each rolled shape length shall be paint stencil marked. Paint marking shall be on both ends in 25 mm minimum high letters with the following: -

Company (Saudi Aramco) and Port Designation

-

Material Grade

-

Heat Number

-

Purchase Order Number and Item Number

-

Saudi Aramco Stock Number (9CAT or 9COM)

-

Member size (type) for example W35 x 230

Each rolled shape length shall be metal stamped with low stress steel stamps with the heat number and grade. Metal stamping will be on one end and shall be located immediately following the corresponding paint stenciled information. The height of the metal stamped marking shall be 6 mm minimum. The above are minimum marking requirements and additional requirements may be specified by the Buyer. 7.2

Plates Each plate shall be paint stencil marked. Paint marking shall be on one corner of the plate in 25 mm minimum high letters. Paint marking shall include the following: -


-

Material Grade

-

Heat Number

-


-


-

Dimensions (thickness in millimeters and inches in parentheses) Page 10 of 13



Each plate shall be metal stamped with low stress steel stamps with the heat number and grade. Metal stamp marking shall be on the corner diagonally opposite the paint markings. The height of the metal stamped marking shall be 6 mm minimum. The above are minimum marking requirements and additional requirements may be specified by the Buyer. 7.3

Tubulars (Structural Pipe) 7.3.1

Paint Marking Requirements Each length of structural pipe shall be paint marked on one end with the following information. Paint marking shall be 25 mm minimum high letters. -


-

Material Grade

-

Heat Number

-


-


-

Dimensions (thickness in millimeters and inches in parentheses)

For pipe sections 24 inches in diameter and above the markings shall be on the inside of the pipe and located approximately 75 - 150 mm from one end. For pipe sections smaller than 24 inches in diameter, markings may be on the outside of the pipe and located approximately 300 mm from one end. In addition to the detailed marks at one end of the structural pipe, the purchase order number and Saudi Aramco Stock Number (9CAT or 9COM) shall be stencil painted inside or outside at the other pipe end and outside in the middle of each length. 7.3.2

Metal Stamp Marking Requirements Each pipe shall be metal stamped with low stress steel stamps with the heat number and grade. The height of the metal stamped marking shall be 6 mm minimum and will be located adjacent to the detailed paint marking.

11 June 2008 14 May 2011

Revision Summary Major revision based on value engineering comments. Editorial revision to remove committee list.

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Appendix 1 – Material Substitution STRUCTURAL STEEL PLATES APPLICATION

API Materials

EN Materials

PL1

API 2H Gr. 42

EN10225, Gr. 355G8+N(2)

PL1

API 2H Gr. 50

EN10225, Gr. 355G8+N(2)

PL1

API 2W Gr. 50

EN10225, Gr. 355G8+M(2)

PL2

API 2H Gr. 42

EN10225, Gr. 355G8+N

PL2

API 2H Gr. 50

EN10225, Gr. 355G8+N

PL2

API 2W Gr. 50

EN10225, Gr. 355G8+M

PL4

ASTM A36 (to 2 inches)

PL4

ASTM A131 Gr. A (to 1.5 inches)

PL4

ASTM A285 Grade C (to ¾ inches)

EN 10025-2, Gr. 275J0

PL4

ASTM A131 Gr. B, D

EN 10025-2, Gr. 275J0

PL4

ASTM A516 Grade 65

EN 10025-2, Gr. 275J0

PL4

A572 Grade 42 (to 2 in. thick)(1) ASTM A572 Grade 50 (to 2 in. thick; S91 required over l/2 in.)(1)

PL4

EN 10025-2, Gr. 275J0 EN 10025-2, Gr. 275JR EN 10025-2, Gr. 275J0

EN 10025-2, Gr. 355JR EN 10025-2, Gr. 355JR

PL4

ASTM A13 1 Grade AH 32

EN 10025-2, Gr. 355JR

PL4

ASTM A131 Grade AH36 to 3 In. thick)

EN 10025-2, Gr. 355JR

(1)

Maximum Vanadium Level Permitted= 0.10% V.

(2)

With the following: (a)

Option 13 (through thickness testing) required if the thickness is greater than 19 mm

(b)

The CE shall not exceed 0.42 and the PCM shall not exceed 0.25 (see 4.2.2)

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STRUCTURAL STEEL SHAPES API RP 2A

API Materials

EN Materials

Group I Class C

ASTM A36 (to 2 inches)

EN 10025-2, Gr. 275J0 EN 10025-2, Gr. 275JR

Group II Class C

A572 Grade 42 (to 2 in. thick)*

EN 10025-2, Gr. 355JR

A572 Grade 42 (to 2 in. thick) S91 required over l/2 in.)*

EN 10025-2, Gr. 355JR

ASTM A13 1 Grade AH 32

EN 10025-2, Gr. 355JR

ASTM A131 Grade AH36

EN 10025-2, Gr. 355JR

Group II Class B

*Maximum Vanadium Level Permitted= 0.10% V

STRUCTURAL STEEL PIPE API RP 2A Group I Class C

API Materials

ISO Materials

API 5L Gr. B

ISO 3183 L245 R or N

ASTM A 53 Gr. B


Group I Class B

ASTM A106 B (normalized)


Group I Class A

A333 Gr. 6


Group II Class B or C

API 5L Grade X42


API 5L Grade X52


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12-SAMSS-018

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