spectra energy transmission

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Spectra Energy Transmission

BC – Pipeline and Field Services

SPECIFICATION SP-90-01 Rev.2

REQUIREMENTS FOR WELDING PRESSURE CONTAINING EQUIPMENT

PREPARED BY: H. M. Yamauchi

Integrity Specialist Spectra Energy Transmission

APPROVED BY: Larry W. Hunt

Manager, Manager, System Integrity & Technical services

DATE: July 29,2010

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Text Box

Tab 2

PROCESS PLANT SPECIFICATION REQUIREMENTS FOR WELDING PRESSURE CONTAINING EQUIPMENT Rev - 2

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TABLE OF CONTENTS

1.0 GENERAL .................................................................................................................. 3

1.1 Scope .................................................................................................................................................................. 3

1.2 References ........................................................................................................................................................ 3

1.3 Subcontracting ................................................................................................................................................. 4

1.4 Conflicts ............................................................................................................................................................. 4

1.5 Submittals .......................................................................................................................................................... 4 1.5.1 Welding ........................................................................................................................................................ 5

2.0 PRODUCTS ................................................................................................................ 5

2.1 General ................................................................................................................................................................ 5

2.2 Filler Metals ....................................................................................................................................................... 6 2.2.1 General ........................................................................................................................................................ 6 2.2.2 SMAW Electrodes ..................................................................................................................................... 6 2.2.3 SAW Wires and Fluxes ............................................................................................................................. 6 2.2.4 FCAW Filler Metal...................................................................................................................................... 6 2.2.5 Storage and Handling ............................................................................................................................... 6

2.3 Welding ............................................................................................................................................................... 7 2.3.1 General ........................................................................................................................................................ 7 2.3.2 Weld Joint Requirements ......................................................................................................................... 7 2.3.3 Production Welding ................................................................................................................................... 8 2.3.4 Joint Back-up Requirements ................................................................................................................... 9 2.3.5 Gas Shielding ............................................................................................................................................. 9

2.4 Thermal Treatment .......................................................................................................................................... 9 2.4.1 Preheat Interpass Temperature .............................................................................................................. 9 2.4.2 Bake-Out Procedure ............................................................................................................................... 10 2.4.3 Postweld Heat Treatment ....................................................................................................................... 10

2.5 Inspection and Testing ................................................................................................................................ 11 2.5.1 General ...................................................................................................................................................... 11 2.5.2 Nondestructive Examination (NDE) ..................................................................................................... 11 2.5.3 Hardness Testing ..................................................................................................................................... 12 2.5.4 Delta Ferrite Testing of Austenitic Stainless Steel Welds ................................................................ 13

2.6 Weld Repairs ................................................................................................................................................... 13


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2.7 Fabrication Straightening ............................................................................................................................ 13

ATTACHMENT A: WELDING PROCEDURE SUMMARY ................................................. 1

ATTACHMENT B: WELDING PRESSURE CONTAINING EQUIPMENT ......................... 2


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1.0 General

1.1 Scope

This Guideline is supplemental to those requirements of applicable ASME codes for arc welding, heat treatment, inspection and nondestructive testing of welds in pressure containing equipment, including pressure vessels and piping..

This document does not address welds on in- service equipment or structural welds.

1.2 References

This Specification refers to the publications listed below. Where such reference is made, it shall include all amendments that are in effect on the purchase order date, except as noted.

American Society of Mechanical Engineers (ASME)

ASME Boiler and Pressure Vessel Code Section I, Power Boilers

ASME Boiler and Pressure Vessel Code, Section II, Welding Rods, Electrodes and Filler Metals, Part C

ASME Boiler and Pressure Vessel Code, Section V, Nondestructive Examination

ASME Boiler and Pressure Vessel Code, Section VIII, Pressure Vessels, Division I and II

ASME Boiler and Pressure Vessel Code, Section IX, Welding and Brazing Qualifications

ANSI/ASME

ANSI/ASME B31.1 Power Piping

ANSI/ASME B31.3 Chemical Plant and Petroleum Refinery Piping

American Society of Nondestructive Testing (ASNT)

ASNT SNT-TC-1A-92 Recommended Practice

American Society for Testing and Materials (ASTM)

ASTM E110 Test Method for Indentation Hardness of Metallic Materials

ASTM E140 Hardness Conversion Tables For Metals

ASTM A833 Standard Practice for Indentation Hardness of Metallic Materials by Comparison Hardness Testers

ASTM E 384 Test Method for Microindentation Hardness of Materials

American Welding Society (AWS)

AWS A2.4 Welding Symbols

AWS A3.0 Terms and Definitions

AWS A4.2 Calibrating Magnetic Instruments to Measure Delta Ferrite

Canadian Standards Association (CSA)

CSA W117.2 Safety in Welding and Cutting


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Canadian General Standards Board (CGSB)

CGSB 48, 9712 Certification of Nondestructive Testing Personnel

National Association of Corrosion Engineers (NACE) Standard

MR0175/ISO 15156 Materials for Use In H2S-Containing Environments In Oil and Gas Production

RP0472-95 Methods and Controls to Prevent In-Service Environmental Cracking of Carbon Steel Weldments in Corrosive Petroleum Refining Environments

Provincial and Federal Regulations

British Columbia Power Engineers and Boiler and Pressure Vessel Safety Act

Industrial Health & Safety Regulations - Workers’ Compensation Board of B.C.

Canada Occupational Safety and Health Regulations

Westcoast Energy Inc.

SP-90-21 Equipment Material Impact Toughness Requirements

SP-90-18 Supplementary Requirements for Sour Service (Replacement to ES-VS1 Supplementary Requirements for Sour Service referenced in ES-VV10.0)

SP-50-03 Piping Materials

Spectra Energy

CS-GC-31.-1 Radiographic Inspection

CS-GC-32.0 Magnetic Particle Inspection

CS-GC-33.0 Liquid Penetrant

ES-VV10.0 Pressure Vessels and Pressurized storage Tanks

CS-GC-34.0 Manual Ultrasonic Inspection

1.3 Subcontracting

Welding and post-weld heat treatment work shall not be subcontracted without prior written approval from the Purchaser.

1.4 Conflicts

In the event of any conflict between this Specification, applicable codes, standards, reference publications, purchase orders or other applicable documents, Contractor shall report in writing such conflicts for review by Purchaser. Contractor shall obtain written clarification from Purchaser before proceeding with work affected by a conflict.

1.5 Submittals

In addition to the requirements of Contract Documents, Vendor Drawing / Data Commitments, the following shall be submitted to the Purchaser for approval prior to production welding.


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1.5.1 Welding

A) For Butt welds and fillet welds - Complete Welding Procedure Specifications (QW-482), and associated Procedure Qualification Records (QW-483) (Attachment A ), with its supporting test results, including the following applicable information: 1) for post weld heat treated welds, macrohardness test results 2) for caustic, amine and sour service welds, microhardness test results 3) brand names of electrodes, fluxes and wires 4) for low temperature service and/or where designated in drawings, impact test results

including specimen size, test temperature, absorbed energy and shear area of each specimen.

5) gas shielding: a) Method of gas supply to the joint; b) Method of venting air from the joint; c) Method of verifying removal of air from the back side of the joint (e.g. number of

purge volumes or oxygen analyzer); and d) Number of passes to be applied before the purge or backing gas is no longer

required.

6) for austenitic stainless steel welds:

a) Method of determining delta ferrite number; and b) Delta ferrite number.

B) In addition to the procedure qualification requirements of item A) the following is also required: I. For temper bead weld – documentation as per ASME Sec. IX QW-290 II. For tube to tube sheet weld – documentation as per ASME Sec IX QW-19,QW-288

2.0 Products

2.1 General

A) Welding shall be done by one or more of the following processes, either single or in combination: shielded metal arc welding (SMAW), flux cored arc welding (FCAW), submerged arc welding (SAW), gas tungsten arc welding (GTAW) and gas metal arc welding (GMAW). This Specification does not prohibit the use of other welding processes, provided it is within ASME Sec. IX, however, prior to use of other processes the Contractor shall provide Purchaser with all qualifications and technical data necessary for the Purchaser to make an informed decision regarding acceptance of this process.

B) Prior to the start of production welding, welding procedure specifications shall be established, qualified and registered with either the British Columbia Safety Authority (BCSA) or the Alberta Safety Authority, where acceptable by BCSA.

C) All welds shall be produced in accordance with approved weld procedures and shall satisfy the requirements of the applicable code.

D) Welding symbols shall be interpreted as per AWS A2.4.

E) Welding terms and definitions shall be in accordance with AWS A3.0.

F) Safety measures for the protection of welders and operators involved in welding and cutting shall be in accordance with the practices specified in CSA W117.2 and local regulations

G) Welding equipment, voltmeters and ammeters shall be in proper working order and calibrated to manufacturer’s tolerance. Periodic checking by the Purchaser’s Inspector may be carried out with amp-tongs or other suitable means.


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2.2 Filler Metals

2.2.1 General

A) The filler material shall be compatible to the base material and shall conform to the requirements of ASME Section IX, and shall be as specified in ASME Code, Section II, Part C.

B) Filler metals and fluxes designed for “single pass welding” shall not be used for “multi-pass welding”.

C) When joining chemically or structurally dissimilar metals (e.g. carbon steel to austenitic stainless steel, austenitic stainless to martensitic stainless steel), filler metal shall be selected or approved by a metallurgical or welding engineer.

D) Low hydrogen welding procedures shall be used for fillet welds and other joints involving high restraint.

2.2.2 SMAW Electrodes

A) Electrodes of the following classifications are not acceptable for pressure containing welds: E6012, E6013, E6020, E7014, E7020, E7024 and E7028.

2.2.3 SAW Wires and Fluxes

A) SAW wire and flux combinations shall be selected in accordance with the recommendations of the wire and flux manufacturer. For production welds, the wire/flux combination shall be of the same brand name as used for the supporting PQR.

B) If a SAW flux or wire brand name must be changed, the welding procedure shall be re-qualified. Substitution based on AWS SFA 5.20 equivalency is not acceptable.

C) Active fluxes shall not be used with the SAW process.

D) Unfused granular SAW flux may be recovered, cleaned and reused. For reuse it shall be free from fragments of fused flux, millscale, dust or any other foreign matter. The reclaimed flux shall be re-baked before use when recommended by the flux manufacturer. Fused SAW flux shall not be ground and reused.

2.2.4 FCAW Filler Metal

A) The FCAW filler metal brand name used for production welds shall be the same as that used for the supporting PQR.

B) Where filler metal brand name must be changed, the welding procedure shall be re-qualified. Substitution shall be based on AWS SFA 5.20.

2.2.5 Storage and Handling

A) The electrodes shall be stored and handled in accordance with ASME Section II, Part C.

B) The flux, electrodes and/or shielding gas shall be free of any contaminants that may affect the weld application or quality.

C) The flux and/or electrodes shall be identifiable at all times.


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2.3 Welding

2.3.1 General

A) Welds shall be produced in accordance with the applicable Welding Procedure conforming to the requirements of design of the applicable ASME or ANSI Code and Provincial Boiler and Pressure Vessel Safety Act.

B) Grinding discs, mechanical cutting tools, and austenitic stainless steel wire brushes used on austenitic stainless steel or other higher nickel alloys shall not have been used on ferrous materials.

C) For the production of stainless steel welds, the weld preparation shall avoid contact with carbon steels and carbon steel filings. Only stainless steel cleaning brushes shall be used, and tools used on stainless steels shall be segregated from carbon steels. Degreasing agents, machining fluids, and cutting fluids used shall be halogen-free.

D) All welding fluxes shall be neutral.

E) Grounding clamps shall be securely fastened to work to prevent arc burns.

F) All weldments, identified as Mill Scab Free (MSF), the root pass shall be deposited by GTAW process with the inner side purged with argon gas for the first two passes.

G) Welds intended for amine, caustic, and/or sour service shall meet the requirements of NACE MR0175/ISO 15156-3 and clause 2.5.3 of this specification.

2.3.2 Weld Joint Requirements

Alignment and fit-up shall meet all of the requirements of the weld procedure and the applicable codes, standards, and specifications. Hammering to obtain alignment shall be minimized, and shall not be permitted after the start of welding. For butt welds joining pipe and/or piping components, the following conditions shall apply:

A) Internal offset shall be uniformly distributed around the circumference of the joint.

B) Internal offset at any point around the circumference shall be limited to 1.6 mm.

C) For members of the same nominal wall thickness, when internal offset exceeds 1.6 mm the Contractor shall apply a smooth tapered transition, 4:1 (4 horizontal, 1 vertical) to the affected areas of one or both components, so that any internal offset is reduced below 1.6 mm.

D) For members with different nominal wall thickness, where internal offset exceeds 1.6 mm, the Contractor shall provide a transition section or a smooth tapered transition, 4:1 as above, to the thicker member, so that internal offset is reduced below 1.6 mm.

E) Transition taper may be prepared by grinding, filing or machining. Flame cut transitions are not permitted.

F) All transitions (internal and external) shall satisfy the design requirements of governing codes, standards, and specifications. After transitioning, wall thickness at all locations shall satisfy the minimum requirements of governing codes, standards and specifications.

G) Weld metal shall not be used to build up or repair the edges of plate or ends of pipe.

H) Where practical all pressure containing butt joints, other than on pipe or pipe components, shall be double-welded (welded from each side).

I) The ends of root tack welds shall be feathered to facilitate fusion with the root pass.


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2.3.3 Production Welding

A) The weld shall meet all of the requirements of the weld procedures and applicable codes, standards and specifications.

B) Tack welds shall be produced by qualified welders according to a qualified weld procedure.

C) Temporary welds are not permitted without prior Purchaser approval. When temporary welds are used, it shall have been produced to appropriate qualified weld procedure, and the weld joint shall be preheated to the temperature specified on the weld procedure prior to welding.

D) If welding is interrupted for a period of time, and the temperature of the joint falls below the minimum preheat temperature, then the weld joint shall be preheated to the minimum preheat temperature specified on the weld procedure, prior to resumption of welding.

E) All welds shall exhibit profiles which are of uniform width throughout the full length, free of coarse ripples, ridges, grooves and excess build-up, and merge smoothly into the base metal.

F) For components subject to vibration, the weld toes shall be free of undercut, overlap, and similar surface notches. The Purchaser reserves the right to require blending in a manner which ensures that weld toes merge smoothly into the base metal.

G) For socket welds, at least two passes shall be deposited and a 1.5 mm space shall be provided between the bottom of the socket and insert, and the weld shall be produced by low hydrogen process.

H) For seal welding threaded components, in addition to all requirements of ANSI/ASME B31.3, seal welds shall, be produced by low hydrogen process, and only be carried out on material which is known to be weldable. The threads shall be free of all thread lubricating compounds. All exposed threads shall be covered with weld metal.

I) Run-on and run-off tab materials shall be the same type and grade as the base metal.

J) When arc-air gouging is used, a minimum of 1.6 mm of weld metal shall be removed from the gouged surface and the surfaces shall be non-destructively examined for evidence of cracking prior to the start of welding.

K) Arc burns are not acceptable. Arc burns shall be completely removed either by cutting out cylinders containing the arc burns, or by using repair procedures that shall include:

1) Checking for complete removal of the altered metallurgical structure by etching the ground area with a 10% solution of ammonium persulphate or a 5% solution of nital; and

2) Measuring the wall thickness in the repaired area using mechanical or ultrasonic techniques, or both, to determine that the minimum wall thickness requirements are maintained.

L) Prior to PWHT or hydro-test, all temporary welds shall be removed by grinding or chipping. The area of removal shall be:

1) made smooth without wall thickness reduction below design;

2) examined by magnetic particle or dye penetrant methods; and

3) Shown to be free of cracks and other indications exceeding the limits of applicable codes.

M) The finished weld shall be prepared in a manner which permits clear and meaningful interpretation of nondestructive test results.


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N) Temporary fabrication attachment welds shall be removed. The affected surface shall be conditioned to eliminate defects. These areas shall be ground smooth, with the grinding blended into the base metal, and shall be examined visually and by magnetic particle or liquid penetrant to ensure that any defects have been removed.

O) Branch connections. Branch connections and welded outlets shall be located such that the toe of the fillet weld is at least 50 mm from any circumferential and longitudinal weld, unless otherwise approved by the Company. Prior to welding branch connections, the run pipe shall be inspected using ultrasonic testing at the location of the connection. The area to be welded shall be free of lamination and have the minimum wall thickness required by design. Branch connections shall generally be installed in accordance with Sec. 12.3 of O&M Manual

P) Valve Assembly. After vacuum or brush cleaning the bore of the valve shall be protected, against entry of weld splatter or any other debris by placing a disc, cut from plywood or equal, and taping it a few cm, from the seat ring. During heat application, such as from preheat or welding, the temperature of the valve body, at a location, opposite the seat ring shall be monitored. Such temperature shall not exceed the maximum rated operating temperature, of the valve.

2.3.4 Joint Back-up Requirements

A) Permanent backing strips shall not be used for pressure containing welds or dynamic loading conditions, unless specifically required by the engineering design and shown on Purchaser accepted drawings.

B) When metal backing strips are permitted, the backing strip material specification, nominal chemistry, and method of application shall be compatible with the weld metal, base metal and welding conditions, and shown on Purchaser accepted drawings.

C) When temporary metal backing strips are removed, the area of attachment shall be ground flush without reducing the thickness of the joint below design requirement, and dye penetrant or magnetic particle tested for cracks or other defects.

D) Backing strip deletion from weld procedure qualified with a backing strip requires re-qualification of the weld procedure.

2.3.5 Gas Shielding

A) Shielding, trailing, purging and backing gases shall be of welding grade with a dewpoint of -40°C or lower. The weld procedure shall state the composition, purity and flow rate of shielding, trailing, purging and backing gases.

B) An inert gas such as Argon shall be used as back up for butt joints, for minimum of 2 weld passes of materials higher than ASME P No. 5. Nitrogen is not an inert gas and is not a suitable purge gas.

2.4 Thermal Treatment

2.4.1 Preheat Interpass Temperature

A) Preheating, where recommended by applicable codes, standards or specifications, shall be considered mandatory.

B) Before any welding or cutting operation, base metals shall be dry.

C) When a minimum interpass temperature is not specified on the welding procedure, the minimum interpass temperature shall be interpreted as the minimum preheat temperature.


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D) Maximum interpass temperature shall be specified on weld procedures where notch toughness is specified.

E) When preheat is required, it shall be applied in a manner which ensures uniform temperature throughout the entire length and thickness of the weld joint for duration of the weld.

F) For preheats less than 200°C, natural gas torches or ring burners, propane (tiger) torches or ring burners, electric resistance coils, or induction coils may be used. For preheat above 200°C, electric resistance or induction heating methods shall be used unless otherwise agreed by the Purchaser. Exothermic kits shall not be used for preheating unless otherwise permitted by the Purchaser.

G) Preheat and interpass temperatures for all welds shall be monitored by the Contractor using suitable contact thermometers, pyrometers, thermocouples, or temperature indication crayons. When control of maximum interpass temperature is required, it shall be measured at the starting location of each successive pass, within 5 to 10 mm of the edge of the joint.

H) Welds shall be wrapped with a dry insulating material when field welding at an ambient temperature less than 0°C.

I) Base materials, and materials showing surface moisture or condensation, shall be dried by pheating prior to welding.

2.4.2 Bake-Out Procedure

A) A Bake out is recommended for tie-ins to existing amine, caustic, and sour systems, particularly for materials which are12.7mm and thicker.

B) The bake out procedure below is limited to P1 materials. For alloy steels consult System Integrity.

C) The following shall be conducted for Bake Out: - Clean metal approximately 100mm as measured from weld bevel. - Conduct shear wave UT inspection to ensure that the weld area is free of lamination

and that the wall thickness of design wall thickness - Conduct bake out using an induction coil or a oxy--acetylene torch. - Heat a width approximately 75 – 80 mm measured from bevel edge slowly to 315-

440oC (600-825oF). This heating cycle should take at least one (1) hour to heat the area.

- The bake out temperature shall be monitored using a Tempil stick or pyrometer. - Hold bake out temperature for one (1) hour. - Insulation blanket shall be wrapped around the bake out area to control cooling rate. - The cooling shall be slow, at a rate approximately 5 degrees C per minute. - As soon as the temperature drops to weld preheat temperature welding shall

commence.

2.4.3 Postweld Heat Treatment

A) PWHT shall be conducted on all pressure containing structures as required by and in accordance with applicable codes, standards, specifications, drawings and/or purchasing documents.

B) When PWHT is required for pressure vessels, it shall be completed as a single unit in a furnace of adequate capacity, unless prior written approval has been obtained from the Purchaser. When it is not possible to PWHT pressure vessels as a single unit, the Vendor shall address the effect of multiple PWHT on the properties of the base material, weld metal, and the heat affected zone, to the satisfaction of the Purchaser.


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C) PWHT procedures for lined or clad piping or equipment shall consider venting requirements.

D) All equipment used in connection with PWHT work must be of sufficient capacity, properly instrumented, calibrated and controlled, and maintained in good working condition to effectively perform the work.

E) If the heating rate, soak temperature, soak time or cooling rate is not stated in the industry code, standard, or specification governing the work, ASME VIII, Div. 1 shall be applied.

F) All machined surfaces shall be protected from excessive oxidation by methods acceptable to the Purchaser.

G) Exothermic and induction heating methods shall not be used for PWHT, other than for piping, without Purchaser acceptance.

H) The required PWHT cycle shall be described in print for the PWHT equipment operator. Strip charts documenting the temperature and time profile of each PWHT cycle shall be provided to the Purchaser.

I) Where the PWHT temperature exceeds the final mill test certificate tempering temperature of materials which have received a “normalized and tempered” or “quenched and tempered” heat treatment, or where the materials are “hot formed” or “normalized”, without subsequent tempering, the vendor shall advise the purchaser of the effects PWHT will have on the properties of the base material, weld metal and heat affected zone of each heat of material used (reference SP-90-21, paragraph. 5.1 (A)).

Note: Where possible, materials should be selected which have received a final temper at a temperature in excess of the planned PWHT temperature.

J) Equipment, other than piping, that has received PWHT shall be marked (paint stenciled):

“STRESS RELIEVED - DO NOT WELD”

K) If welding is required after a PWHT the minimum requirements of governing codes, standards, and specifications shall be satisfied.

2.5 Inspection and Testing

2.5.1 General

A) Where reinforcement pads are required, ASME Category D welds and piping branch-to-run welds shall be examined for defects by wet magnetic particle, before reinforcement pad is welded in place.

B) The Contractor shall assign each welder a unique symbol or stamp. Each welder shall apply their unique symbol or number to all completed welds. For carbon steel and low alloy steel welds, a low stress stamp may be used. For materials where stamping is not allowed, vibro-etching or paint sticks (suitably free of lead, sulphur and chlorides) shall be used.

C) Purchaser’s Inspector or his authorized representative shall have free access to the Contractor’s work place and shall have the right of rejection of any workmanship that does not meet the specifications. Additional testing of welds may be required where original testing was not conclusive.

2.5.2 Nondestructive Examination (NDE)

A) General


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1) All butt welds, unless otherwise stated, shall be inspected for 100% of their circumferences using radiographic method. Radiographic inspection shall be performed in accordance with ASME BPVC Sec V and CS-GC-31. 3.

All fillet welds shall be inspected using wet magnetic particle inspection or dye penetrant inspection as per Attachment B, in accordance with the requirements of ASME BPVC Sec V and CS-GC-32.0 or CS-GC-33.0 as applicable..

All fillet weld areas shall be ultrasonically inspected prior to welding. Such areas shall be free of lamination and shall meet the minimum wall thickness requirements. All butt welds that cannot be effectively radiographed and fillet welds that cannot be effectively inspected by magnetic particle shall be inspected by ultrasonic method in accordance with ASME BPVC Sec V.

Butt welds and fillet welds shall be visually inspected by Company welding inspector.

The acceptability of imperfections of size and type located by radiographic, magnetic particle, liquid penetrant, ultrasonic, or visual inspection shall be in accordance with the more stringent requirements of ASME Sec. VIII, B31.1 or ASME B31.3, as applicable, and SA-2 Rev.0 Standard of Acceptability Process Plant unless otherwise approved by engineering.

2) Nondestructive examination requirements for pressure vessels are noted in Section 9 of Specification ES-VV10.0 - Pressure Vessels and Pressurized Storage Tanks.

3) In addition to the above, additional inspecting and testing shall be conducted as outlined in Attachment B.

2.5.3 Hardness Testing

A) Weld Procedure Qualification

1) For welds which will be exposed to sour, amine or caustic environments, hardness tests shall be carried out on all weld procedure qualifications as per SP-90-18.

2) The weld and heat affected zone hardness shall not exceed 248 those outlined in MRO175 ISO15156, table below


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2.5.4 Delta Ferrite Testing of Austenitic Stainless Steel Welds

A) Where practical, the delta ferrite shall be determined for both PQR’s and production welds on each external and internal surface (where accessible) of welds at 4 equidistance locations or at 1 m separation, whichever yields the greatest frequency.

B) All austenitic stainless steel pressure vessel welds shall be tested for delta ferrite content.

C) The gauge used to determine delta ferrite number shall be calibrated in accordance with AWS A4-2.

D) For Acceptance, the ferrite measurement shall not be less than 5 nor greater than 12.

2.6 Weld Repairs

Welds which do not comply with the acceptance criteria specified shall be repaired and re-examined in accordance with the following:

A) The defective area, other than cracks, shall be excavated and examined by magnetic particle or liquid penetrant methods to assure complete removal of defects. The repaired areas shall be re-examined using the same inspection procedures by which the defect was originally detected.

B) Repairs shall be at least 50 mm long. Through-wall and partial through-wall repairs shall not exceed a total length of 30% of the pipe circumference. Weld repairs made in the root pass using back welding and weld repairs made in the cap pass may extend the full circumference

A maximum of two repairs may be repeated in the same area. Grind marks shall not reduce the nominal wall thickness by more than 5% may be repaired by sanding. Any defects that exceed the above limitations, and any cracks shall be removed as a cylinder.

C) Any weld containing crack may only be repaired when Contractor had prepared, a crack repair procedure that was approved by Purchaser.

D) Repairs to correct weld defects shall be made using weld procedure, used to produce the original weld, with minimum preheat of 120oC. Preheating should extend to a distance of at least 150mm from any point of the area to be repaired. No part of the area shall be heated to a temperature in excess of 200oC.

2.7 Fabrication Straightening

A) Misaligned fabrication may only be returned to alignment when authorized by Purchaser.

B) All straightening shall be performed in accordance to a Purchaser approved procedure

ATTACHMENT A -- WELDING PROCEDURE SUMMARY

Procedure Supporting Joint ASME - ASTM Thickness PWHT Review No. PQR Process Type Material Qualified No Yes Comments Status Date

LEGEND REMARKS: Joint Type Description

A Longitudinal Seam B Circumferential Seam C Pipe Seam D Nozzle Seam E Other (explain in comments section)

Review Status A Commence Fabrication B Commence Fabrication (submit with corrections) C Do Not Fabricate

MANUFACTURER: __________________________ SHOP LOCATION: ________________ DATE: ____________ P.O. NUMBER: __________________________ ITEMS: ______________________________________________

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SPECIFICATION ATTACHMENT B -- WELDING PRESSURE CONTAINING EQUIPMENT

SP-90-01 INSPECTION & TESTING

LINE CLASS

SERVICE DESCRIPTION CORR.

ALLOW. (in.)

FLANGE RATING

TEMP RANGE (DEG. F)

RT* (%)

MT** (%)

PT** (%)

CV BH (%)

VT (%)

DF (%)

A2A Hydrocarbons, Fuel Gas, Nitrogen, TEG, EG, A/G Drains, Vents to ATM, Water (Cooling and Plant), Sulfolane, Potassium Carbonate, DIPA, Utility Air, Process Air Air Service: For ≤ 3/4”, use A5Y For MDMT - 50F, use A3A and A5Y

Carbon Steel Pressure Limit: B16.5 MG 1.1 No PWHT

0.0625 Class 150 RF

-20 to 650 10

10

100

A2A3 *******UNDERGROUND******* Hydrocarbons, Fuel Gas, Water (Cooling and Plant), Air (Process), TEG, EG, Open Drains and Sanitary Sewer

Carbon Steel (Concrete Cased or Coat and Wrap 150°F) Pressure Limit: B16.5 MG 1.1 No PWHT

0.125 Class 150 RF

-20 to 350

10

- 10

100

A2C Amine (Lean), MEA, DEA, Sulfinol, Ucarsol Carbon Steel Pressure Limit: B16.5 MG 1.1 PWHT

0.0625 Class 150 RF

-20 to 350 100 100 10 100

A2J *******GLYCOL JACKETED******* Liquid Sulphur, Sweep Air (Sulphur Pit)

Carbon Steel (Jacketed) Pressure Limit: B16.5 MG 1.1 No PWHT

0.125 Class 150 RF

-20 to 400 100 100 100

A2L Potable Water, Deluge Water, Instrument Air Instrument Air ≤ 3/4”, use A5Y

Carbon Steel (Galvanized to 2”) (Bare above 2”) Pressure Limit: 150 psig No PWHT

0.0625 Class 150 RF

-20 to 120 10

10

100

A2M Sulphurous Acid Gas (H2S >1.1%)

Carbon Steel Pressure Limit: 60 psig No PWHT

0.125 Class 150 RF

-20 to 650 100 100 100

A2M4 Sulphurous Acid Gas (H2S >1.1%) Low Pressure Flare (Not Vacuum Rated)


0.125 Class 150 RF

-20 to 650 100 100 100

A2N *******NACE MR-01-75******* Sour Service: Amine (Rich), MEA, DEA, Sulfinol, Ucarsol, Wet Acid Gas, High Pressure Flare, Potassium Carbonate (Rich)

Carbon Steel Pressure Limit: B16.5 MG 1.1 PWHT

0.125 Class 150 RF

-20 to 500 100 100 10 100

- 2 - September 3, 2010

INSPECTION & TESTING

LINE CLASS


ALLOW. (in.)

TEMP RT* FLANGE MT** PT** CV BH VT DF (%) RANGE (%) RATING (DEG. F) (%) (%) (%) (%)

A2N2 *******VIBRATING SERVICE******* *******NACE MR-01-75******* Sour Service: Amine (Rich), MEA, DEA, Sulfinol, Ucarsol, Wet Acid Gas, Potassium Carbonate (Rich)


0.125 Class 150 RF

-20 to 500 100 100 10 100

A2P Caustic Potassium Hydroxide (< 80 °C) (Below 3/4”, use A5Y tubing)


0.0625 Class 150 RF

-20 to 160 100

100

5 100

A2R *******NACE MR-01-75******* Closed Amine Drain MEA, DEA, Sulfinol, Ucarsol, Potassium Carbonate

Carbon Steel Pressure Limit: 100 psig PWHT

0.125 Class 150 RF

-20 to 350 100 1OO 10 100

A2S Steam, Condensate, Boiler Feed Water, and Blow Down


0.0625 Class 150 RF

32 to 500 100

100

100

A2S2 *******VIBRATING SERVICE******* Steam, Condensate, Boiler Feed Water and Blow Down


0.125 Class 150 RF

32 to 500 100 100 100

A2X ******ASME B31.1****** Steam, Condensate, Boiler Feed Water and Blow Down

Carbon Steel (ASME) Pressure Limit: B16.5 MG 1.1 No PWHT

0.0625 Class 150 RF

32 to 500 100

100

100

A2X2 ******VIBRATING SERVICE****** ******ASME B31.1****** Steam, Condensate, Boiler Feed Water and Blow Down


0.125 Class 150 RF

32 to 500 100

100

100

A3A Hydrocarbons, Fuel Gas, TEG, EG, A/G Drains, Vents to ATM, Water/Glycol, Nitrogen, Utility Air, Process Air, Instrument Air (Bare Low Temperature)

Carbon Steel (Low Temp.) Pressure Limit: B16.5 MG 1.3 No PWHT

0.0625 Class 150 RF

-50 to 500 10

10

YES 100

A3N *******NACE MR-01-75******* Sour Service: Amine (Rich), MEA, DEA, Ucarsol, Sulfinol, Wet Acid Gas, High Pressure Flare, Potassium Carbonate (Rich)

Carbon Steel (Low Temp.) Pressure Limit: B16.5 MG 1.3 PWHT

0.125 Class 150 RF

-50 to 500 100 100 YES 10 100

A3N2 *******VIBRATING SERVICE******* *******NACE MR-01-75******* Sour Service: Amine (Rich), MEA, DEA, Ucarsol, Sulfinol, Wet Acid Gas, Potassium Carbonate (Rich)


0.125 Class 150 RF

-50 to 500 100 100 YES 10 100

- 3 - September 3, 2010


LINE CLASS


ALLOW. (in.)


A3R *******NACE MR-01-75******* Closed Drain: MEA, DEA, Ucarsol, Sulfinol, Potassium Carbonate

Carbon Steel (Low Temp.) Pressure Limit: 100 psig PWHT

0.125 Class 150 RF

-50 to 350 100 100 YES 10 100

A3R3 *******UNDERGROUND******* *******NACE MR-01-75 ******* Closed Amine Drain (Carbon Steel with Field Concrete External Casing)

Carbon Steel (Low Temp.) Pressure Limit: 100 psig PWHT

0.125 Class 150 RF

-50 to 350 100 100-- YES 10 100

A5N2 *******VIBRATING SERVICE******* *******NACE MR-01-75******* Sour Service: Amine (Rich), MEA, DEA, Ucarsol, Sulfinol, Potassium Carbonate

304L Stainless Steel Pressure Limit: B16.5 MG 2.1 No PWHT

0.0312 Class 150 RF

-50 to 650 100 100 100 100

A5P Chemical Injection, Sulfite, Low pH Water, Sulfuric Acid (93%)


0.000 Class 150 RF

-50 to 350 100

100

100 10

A5T Lube and Seal Oil For < 3/4”, use A5Y)


0.000 Class 150 RF

-50 to 350 10

10

100 10

A5V Breathing Air Downstream of Filter Pack 304L Stainless Steel (Tubing) Pressure Limit: 170 psig No PWHT

0.000 Class 150 RF

-50 to 150 10

10

100 10

A5Y Glycol and Steam Tracing, Glycol Jumpovers, Amine, Phosphate, Sulfite, Process/Utility/Instrument Air Tubing, Caustic Tubing, Lube Oil Tubing

316L Stainless Steel (Tubing) Pressure Limit Varies See Class Details No PWHT

0.000 Tube Fitting -50 to 650 100

C2A Hydrocarbons, Fuel Gas, Nitrogen, TEG, EG, A/G Drains, Vents to ATM, Water (Cooling and Plant), Sulfolane, Potassium Carbonate, DIPA


0.0625 Class 300 RF

-20 to 650 100 100 100

C2J *******GLYCOL JACKETED******* Liquid Sulphur Sweep Air (Sulphur Pit)

Carbon Steel (Jacketed) Pressure Limit: B16.5 MG 1.1 No PWHT

0.125 Class 300 RF

-20 to 400 100 100 100

C2N *******NACE MR-01-75******* Sour Service: Amine (Rich), MEA, DEA, Sulfinol, Ucarsol, Wet Acid Gas, High Pressure Flare, Potassium Carbonate (Rich)


0.125 Class 300 RF

-20 to 500 100 100 5 100

C2N2 *******VIBRATING SERVICE******* *******NACE MR-01-75******* Sour Service: Amine (Rich), MEA, DEA, Sulfinol, Ucarsol, Wet Acid Gas, Potassium Carbonate (Rich)

Carbon Steel (Tubing) Pressure Limit: B16.5 MG 1.1 PWHT

0.125 Class 300 RF

-20 to 500 100 100 5 100

- 4 - September 3, 2010


LINE CLASS


ALLOW. (in.)


C2S Steam, Condensate, Boiler Feed Water and Blowdown


0.0625 Class 300 RF

32 to 650 100 100 100

C2S2 *******VIBRATING SERVICE******* Steam, Condensate, Boiler Feed Water and Blowdown


0.125 Class 300 RF

32 to 650 100 100 100

C2X *******ASME B31.1******* Steam, Condensate, Boiler Feed Water and Blowdown


0.0625 Class 300 RF

32 to 650 100 100 100

C2X2 *******VIBRATING SERVICE******* *******ASME B31.1******* Steam, Blowdown, Condensate, Boiler Feed Water and Blowdown


0.125 Class 300 RF

32 to 650 100 100 100

C3A Hydrocarbons, Fuel Gas, Nitrogen, TEG, EG, A/G Drains, Water/Glycol, Sulfolane, Potassium Carbonate, DIPA

Carbon Steel (Low Temp.) Pressure Limit: B16.5 MG 1.3 No PWHT

0.0625 Class 300 RF

-50 to 500 100 100 YES 100

C3N *******NACE MR-01-75******* Sour Service: Amine (Rich), MEA, DEA, Ucarsol, Sulfinol, Wet Acid Gas, High Pressure Flare, Potassium Carbonate (Rich)


0.125 Class 300 RF

-50 to 500 100 100 YES 10 100

C3N2 *******VIBRATING SERVICE******* *******NACE MR-01-75******* Sour Service: Amine (Rich), MEA, DEA, Ucarsol, Sulfinol, Wet Acid Gas, Potassium Carbonate (Rich)


0.125 Class 300 RF

-50 to 500 100 100 YES 10 100

C5J *******GLYCOL JACKETED******* Liquid Sulphur Sweep Air (Sulphur Pit)

316L Stainless Steel (Jacketed) Pressure Limit: 200 psig @ 400°F No PWHT

0.000 Class 300 RF

-20 to 400 100 100 100 100

C5N2 *******VIBRATING SERVICE******* *******NACE MR-01-75******* Sour Service: Amine (Rich), MEA, DEA, Ucarsol, Sulfinol, Potassium Carbonate


0.0312 Class 300 RF

-50 to 650 100 100 100 100

F2A Hydrocarbons, Fuel Gas, Nitrogen, TEG, EG, A/G Drains, Water (Cooling and Plant), Sulfolane, Potassium Carbonate, DIPA

Carbon Steel Pressure Limit: B16.5 MG 1.1 PWHT >.75” Wall

0.0625 Class 600 RF

-20 to 650 100 100 5 100

F2A3 Raw Water Pipeline Carbon Steel Internally Lined Pressure Limit: 1100 psig No PWHT

0.0625 Class 600 RF

32 to 150 100 100 5 100

- 5 - September 3, 2010


LINE CLASS


ALLOW. (in.)


F2C Amine (Lean), MEA, DEA, Sulfinol, Ucarsol Carbon Steel Pressure Limit: B16.5 MG 1.1 PWHT

0.0625 Class 600 RF

-20 to 350 100 100 5 100

F2N *******NACE MR-01-75******* Sour Service: Amine (Rich), MEA, DEA, Sulfinol, Ucarsol, Wet Acid Gas, High Pressure Flare, Potassium Carbonate (Rich)


0.125 Class 600 RF

-20 to 650 100 100 5 100

F2N2 *******VIBRATING SERVICE******* *******NACE MR-01-75******* Sour Service: Amine (Rich), MEA, DEA, Sulfinol, Ucarsol, Wet Acid Gas, Potassium Carbonate (Rich)


0.125 Class 600 RF

-20 to 650 100 100 10 100 100

F2S Steam, Condensate, Boiler Feed Water and Blowdown


0.0625 Class 600 RF

32 to 650 100 100 5 100 10

F2S2 *******VIBRATING SERVICE******* Steam, Condensate, Boiler Feed Water and Blowdown


0.125 Class 600 RF

32 to 650 100 100 5 100

F2X ******ASME B31.1****** Steam, Condensate, Boiler Feed Water and Blowdown

Carbon Steel (ASME) Pressure Limit: B16.5 MG 1.1 PWHT >.75” Wall

0.0625 Class 600 RF

32 to 650 100 100 5 100

F2X2 *******VIBRATING SERVICE******* ******ASME B31.1****** Steam, Condensate, Boiler Feed Water and Blowdown

Carbon Steel (ASME) Pressure Limit: B16.5 MG 1.1 PWHT >.75” Wall

0.125 Class 600 RF

32 to 650 100 100 5 100

F3A Hydrocarbons, Fuel Gas, Nitrogen, TEG, EG, A/G Drains, Water/Glycol, Sulfolane, Potassium Carbonate, DIPA

Carbon Steel (Low Temp.) Pressure Limit: B16.5 MG 1.3 PWHT >.75” Wall

0.0625 Class 600 RF

-50 to 650 100 100 YES 5 100

F3N *******NACE MR-01-75******* Sour Service: Amine (Rich), MEA, DEA, Ucarsol, Sulfinol, Wet Acid Gas, High Pressure Flare, Potassium Carbonate (Rich)


0.125 Class 600 RF

-50 to 650 100 100 YES 10 100

F3N2 *******VIBRATING SERVICE******* *******NACE MR-01-75******* Sour Service: Amine (Rich), MEA, DEA, Ucarsol, Sulfinol, Wet Acid Gas, Potassium Carbonate (Rich)


0.125 Class 600 RF

-50 to 650 100 100 YES 10 100

- 6 - September 3, 2010

- 7 - September 3, 2010


LINE CLASS


ALLOW. (in.)

FLANGE RATING

TEMP RANGE (DEG. F)

RT* (%)

MT** (%)

PT** (%)

CV BH (%)

VT (%)

DF (%)

F5N2 *******VIBRATING SERVICE******* *******NACE MR-01-75******* Sour Service: Amine (Rich), MEA, DEA, Ucarsol, Sulfinol, Potassium Carbonate


0.0312 Class 600 RF

-50 to 500 100 100 100 100

F5P Chemical Injection, Sulfite, Low pH Water, Sulfuric Acid (93%)


0.000 Class 600 RF

-50 to 350 100 100 100 10

G3A Hydrocarbons, Fuel Gas, Nitrogen, TEG, EG, A/G Drains, Water/Glycol, Sulfolane, Potassium Carbonate, DIPA

Carbon Steel (Low Temp.) Pressure Limit: 1585 psig @ 150°F No PWHT

0.0625 Class 900 RF

-50 to 150 100 100 100

L2F *******ABOVE GROUND******* Firewater


0.0625 Class 150 RF

32 to 150 10

10

100

L2F3 *******UNDERGROUND******* Firewater

Carbon Steel (Coat and Wrap) Pressure Limit: 175 psig No PWHT

0.0625 Class 125 FF

32 to 150 10

10

L6A3 ******ABOVE AND UNDERGROUND****** Sulphur Block Runoff Runoff Neutralization Recirculation Neutralized Sulphur Block Runoff Water

HD Polyethylene Pressure Limit: 78 psig @ 100°F

0.0000 Class 150 RF

32 to 100

Legend

RT – Radiographic CV – Charpy V-Notch PT – Liquid Penetrant DF – Delta Ferrite

MT – Magnetic Particle BH – Brinnell Hardness VT – Visual

* Butt Welds Only

** Fillet Welds Only