P8A-AG3_U

(1)

WELDED FABRICATION OF GAS TURBINE PIPING

DOCUMENT REVISION STATUS: DETERMINED BY THE LAST ENTRY IN THE "REV" AND "DATE" COLUMN

REV. DESCRIPTION SIGNATURE REV. DATE

M REVISED REQUIREMENTS FOR ROOT PASS WITH GMAW. ADDED WELD FILLER METALS FOR P91 JOINTS. ADDED

NOTES AND REVISED FIGURE P6. (AR GHOLKAR) CR TRIPEPI 2001 MAY 07

N UPDATED REFERENCE TO B31.3. ADDED APPLICABLE DOCUMENTS. REVISED WELDING QUALIFICATION AND PRODUCTION PROCESS REQUIREMENTS. ADDED

REQUIREMENT FOR NDE/LEAK TEST AFTER REWELDING OR RE-HEAT TREAT. ADDED ACCEPTANCE CRITERIA FOR MT, PT AND UT; APPENDIX 1. ADDED FILLER BI TO P-43 INCONEL 625 TO ALL P1 COMBINATIONS. ADDED NOTES 5 AND 6 AND REFORMATTED FOR READABILITY. APPENDIX II, REVISED FIGS. 4, 12, 13 AND 14; DCI NO. 03020190. (PR

BUDKA) CR TRIPEPI 2004 MAR 02

P ADDED ADDITIONAL REQUIREMENTS (IN ADDENDUM I) IN COMPLIANCE WITH DIRECTIVE 97/23/EC OF THE

EUROPEAN PARLIAMENT CONCERNING PRESSURE

EQUIPMENT. DCI NO. 04009579. (J. CHEN) CR TRIPEPI 2004 MAY 26

R EDITORIAL CHANGES FOR CLARIFICATION AND TO DELETE ARCHAIC INFORMATION THROUGHOUT DOCUMENT. ADDED TOC. REPLACED FILLER METAL TABLES WITH THE SAME AS IN P8A-AG1 AC. UPDATED AND ADDED FIGURES. RECLASSIFIED TO CLASS II NONCRITICAL. DCI 11017415.

(BD JOHNSTON) JL SMITH 2011 JUL 28

T COMPLETE REVISION. WORDING IN COMPLIANCE WITH

ASME B31.1. ECO0144238. (BD JOHNSTON) JL SMITH 2014 APR 21

U REVISED TO NON-CRITICAL, INADVERTENTLY MADE

CRITICAL AT REV T. ECO0167052. (JL SMITH) JL SMITH 2014 OCT 27

All rights reserved. The information contained herein is Proprietary Technical Information that belongs to General Electric Company, GE Power & Water (USA), LLC and/or their affiliates, which has been provided solely for the express reason of restricted private use. All persons, firms, or corporations who receive such information shall be deemed by the act of their receiving the same to have agreed to make no duplication, or other disclosure, or use whatsoever for any, or all such information except as expressly authorized in writing by General Electric Company, GE Power & Water (USA), LLC and/or its affiliates.

PREPARED BY:

(2)

1.2.2 This specification is not applicable to fabrication of tubular components whose primary function is structural, or other than conveyance of liquids or other applications not typically considered to be piping assemblies or systems. Fabrication of those non-applicable components for gas turbine applications is governed by the requirements of GE Specification P8A-AG1. Examples of tubular components whose fabrication is governed by P8A-AG1 rather than P8A-AG3 include struts, combustion liners, transition pieces, combustion cans, combustion flow sleeves and wrappers.

1.2.3 This specification is not applicable to structural steel framing for pipe support structures or pipe racks. Structural steel fabrication shall conform to AWS D1.1 Structural Welding Code.

1.2.4 Modification or repairs of existing piping systems shall comply with the intent of this specification as applicable.

(6)

2.1 External Supplier (See Definition) - GE Power & Water Sourcing is the authorized interface for all communication between GE and the External Supplier. All questions or requests for additional information shall be submitted to GE Power & Water for clarification. Conflicts between applicable Specifications or drawings shall be submitted to GE Power & Water for resolution by Engineering.

2.2 Internal Supplier (See Definition) - All communication, including questions or requests for additional information, shall be submitted to Materials and Processes Engineering.

2.3 Requests for Deviations - Requests for deviations to the requirements of this specification shall be submitted as follows:

2.3.1 External Supplier - To GE Power & Water Sourcing by SDR.

2.3.2 Internal Supplier - To the appropriate Engineering personnel by NCR.

3. APPLICABLE DOCUMENTS

3.1 The following documents shall form an integral part of this specification to the extent specified herein. Unless otherwise indicated, the latest issue shall apply.

3.1.1 General Electric Company

P8A-AG1 Welding-General Specification P10A-AG2 Heat Treat Process Control P28A-AL-0002 Supplier Quality Requirements 351A3700 Applied Practices - Piping 3.1.2 American Welding Society (AWS)

AWS A2.4 Symbols for Welding and Non-Destructive Testing AWS A3.0 Terms and Definitions, Welding and Cutting

AWS B1.11 Guide for the Visual Examination of Welds

(7)

ASTM E94 Recommended Practice for Radiographic Testing 3.1.4 American Society of Mechanical Engineers (ASME)

Boiler and Pressure Vessel Code:

Section IX-Welding and Brazing Qualification Section V-Non-Destructive Examination

Section VIII-Div. I-Rules for Construction of Pressure Vessels ASME B31.3 Process Piping Code

3.1.5 American Society for Non-Destructive Testing (ASNT)

ASNT SNT TC 1A Personnel Qualification And Certification In Non-Destructive Testing

3.2 Hiearchy of Documents - In the event of a conflict between documents, the order of precedence from highest

to lowest is:

 Purchase Order

 Part Drawing

 Part Specification

 Process Specification (casting, forging, welding, coating, etc.)

 Material Specification

4. DEFINITIONS

4.1 Personnel

4.1.1 Purchaser - GE Energy Sourcing, or its Business Associate.

4.1.2 External Supplier (Including Sub-Tier) - The Corporation, company,

partnership, sole proprietorship or individual contracted by GE Power & Water Sourcing or GE Global Project Operation (GPO) to perform the process

covered by this Specification.

(8)

External or an Internal Supplier. 4.2 Specification Deviation Documents

4.2.1 Applicable to External Supplier - Supplier Deviation Request (SDR) - A method for the documentation, approval and control of a waiver for materials,

processes, or dimensions which deviate from the Purchase Order documents (drawings, specifications, Engineering Instructions, etc.).

4.2.2 Applicable to Internal Supplier - Quality Control Report (QCR) - GE Gas Turbine Manufacturing Organization non-conformance report initiated during processing through the factory. Used by Manufacturing to document non-conformance to governing documents and request corrective action. 4.3 Technical Terms

4.3.1 DMW - dissimilar metal weld 4.3.2 GMAW - Gas Metal Arc Welding 4.3.3 LCZ - low carbon zone

4.3.4 PWHT - post weld heat treat 4.3.5 t - thickness of the weld

4.3.6 T - thickness of the parent or base material, or the thinner member when parts of unequal thickness are butt welded together

4.3.7 TS - Tensile Strength

4.3.8 Tw - minimum pipe wall thickness

NOTE: Welding terminology is defined in AWS A3.0, Terms and Definitions, Welding

and Cutting.

4.4 Weld Symbols - Weld symbols are defined by the American Welding Society in AWS A2.4.

(9)

accordance with the ASME Boiler and Pressure Vessel Code Section IX or ASME B31.3 or by GE Specification number for materials with no ASME-assigned "P" number.

5. RESPONSIBILITIES

5.1 Materials and Processes Engineering - MPE shall maintain and update this specification as needed.

5.2 Suppliers

5.2.1 Suppliers shall qualify all welders and welding procedures used. Approval of all qualifications shall be in accordance with Section 7.

5.2.2 Suppliers shall maintain all records identified in this specification.

5.2.3 Suppliers shall promptly submit a Certificate of Conformance (CoC), to the buyer, for each component/fabrication stating that the component/fabrication was processed in accordance with the requirements of this Specification and other applicable documents. The Certificate shall be signed and dated by an authorized Supplier Representative and shall, as a minimum, include the following information:

 Supplier Name, Address and GE-designated External Supplier Code

 GE Purchase Order Number and date

 GE Drawing and Serial Number

 MPP Identification Number (if applicable), Revision Level, and Revision Date

 SDR Numbers

The buyer may request that all CoCs be maintained by the supplier in lieu of submittals, and that CoCs must be available upon request or audit.

5.3 Sourcing Quality - Sourcing Quality shall ensure that all External Supplier welders and welding procedures are properly qualified to this document before they begin production work.

5.4 Plant Welding Engineer - GE Gas Turbines Plant Welding Engineer shall ensure that welding procedures are qualified according to ASME Section IX and that all Internal Supplier welders and welding procedures are qualified to the requirements of this specification before they begin production work.

(10)

5.5.1 The Purchaser reserves the right to periodically audit the Supplier's facilities and practices. Such audits shall not relieve the Supplier from the responsibility of producing the fabrications in a suitable condition.

5.5.2 The Purchaser reserves the right to perform additional checks, such as UT or RT, in order to verify if the weld quality meets the requirements, even if there is no such check required by the drawing/specification. The acceptance criteria will be those of P8A-AG1 for the relevant inspection method used. If GE is satisfied that the Purchaser’s inspection methods, techniques, and results are valid and that the parts are truly defective, the Supplier shall repair or replace such parts at the Supplier’s own expense.

6. WELD CODES

6.1 Assignment of Weld Codes

6.1.1 The weld code for Gas Turbine and Accessory systems piping is Code N

unless designated Code D in the engineering design specifications or within the GE Piping Applied Practices specification 351A3700.

6.1.2 Code N exceeds ASME B31.3 inspection requirements for Normal Fluid Service; Code D inspection requirements are the same as ASME B31.3 requirements for Category D fluid service.

TABLE 1 – Inspection Codes

6.2 Weld Codes on Drawings

6.2.1 The Weld Code shall be written as a general drawing note or shown in the tail of the welding symbol.

6.2.1.1 If all or most welds on a particular drawing are of one Code, a general note may be used. For example, “Unless otherwise specified, all welds are Code D.”

GE INSPECTION CODE REQUIRED INSPECTION

N Para. 9.1.1

(11)

of the weld symbol. Any Code specified in the tail of a weld symbol supercedes general drawing notes

FIGURE 1 – Example of a Welding Symbol with Inspection Code D

7. QUALIFICATION REQUIREMENTS

7.1 Approval

7.1.1 Welding is not released for production until the WPSs, PQRs, and welder qualifications have been approved.

7.1.2 For fabrications made by suppliers outside the Gas Turbine Operation, WPSs, PQRs, and WPQRs shall be submitted through Sourcing to the SQE and MPE for approval.

7.1.3 For fabrications made inside GE Gas Turbines Manufacturing Plant Welding Engineer shall be responsible for issuing welding special process and

manufacturing engineering instruction and qualification packages.

7.2 MPP and FPQ - An MPP and FPQ are required for each new supplier and a new design unless otherwise authorized by GE. Detailed requirements for the MPP and FPQ shall be presented according to the applicable part specific process

specifications or P28A-AL-0002. 7.3 Welding Procedure Qualification

7.3.1 PQRs are to be in accordance with ASME Section IX.

7.3.2 PQRs developed by acquired companies may be used to qualify WPSs for the new owners. The source of the PQRs shall be preserved.

7.3.3 All divisions of the General Electric Corporation have operational control of Welding Procedure Qualifications produced within or acquired by any division of the General Electric Coporation.

(12)

7.4.1 Detailed WPSs shall be prepared for all welds. WPSs shall be qualified and documented in accordance with ASME Section IX.

7.4.2 WPSs shall be qualified by a PQR in accordance with ASME Section IX. 7.5 Welder Performance Qualification

7.5.1 Welders and welding operators shall be qualified in accordance with ASME Section IX.

7.5.2 Suppliers shall assign an individual identification to each welder and welding operator.

7.5.3 Suppliers shall maintain self-certified records showing the date and limits of qualifications, and the identification designation assigned to each welder and welding operator.

7.5.4 Internal Supplier (see Definitions) welders shall also meet the visual acuity requirement of AWS D17.1 Paragraph 4.2.1.

7.5.5 All divisions of the General Electric Corporation have operational control of Welder Performance Qualifications produced within or acquired by any division of the General Electric Coporation.

8. PRODUCTION PROCESS REQUIREMENTS

8.1 Added Welds - If weld joints not shown on the drawing are required to fabricate a piping assembly and the WPS or WPQ Essential Variables change, then they shall be submitted and approved before the added welds are made.

8.2 Alignment Tolerances

8.2.1 Alignment tolerances for butt welded joints shall be the smaller of the values stated in the welding procedure specification or the engineering drawing. If the applicable drawing or welding procedure specification does not specify

alignment tolerances, the maximum offset in the weld joint inside diameter shall be 0.062 inch for open root butt welds made without consumable inserts. See Figure P10, P10A, or P10B.

(13)

diameter trimmed so that the adjoining surfaces meet tolerance requirements. This trimming shall not result in a pipe wall thickness less than the minimum design thickness and the change in contour shall not exceed 30 degrees. (See Figure P10A).

8.2.3 Misalignment in pipes of sufficient diameter and wall thickness may

alternatively be corrected by weld build-up of the inside diameter of the larger pipe. Welding shall be in accordance with the requirements of this specification. Any build-up shall blend in with the base stock with a minimum 4:1 taper (i.e., 1/8 inch build-up at the edge must join the base stock at least 1/2 inch from the edge). (See Figure P10B).

8.2.4 Branch connection welds shall meet the following alignment tolerance requirements.

 Branch connection welds which abut the outside surface of the run pipe shall be contoured for groove welds which meet the requirements of Figure P14.

 The inside bore of the branch pipe shall not be offset from the penetration hole through the run pipe more than the lesser of 1/8 inch or 1/2 the nominal wall thickness of the branch.

 Branch connections which are inserted through a run opening shall be inserted at least as far as the inside surface of the run pipe at all points. The weld joint root gap shall not exceed 0.09 inch.

8.3 Bare Wire Storage - Bare wire shall be clean when used. It shall be stored in a manner which will keep it clean. Each spool of electrode used for automatic welding shall be covered or removed from the wire feeder if it could become contaminated from exposure to the atmosphere.

8.4 Clad or Lined Piping - Welding of clad or lined piping shall be done in accordance with applicable provisions of the ASME B&PVC, Section VIII, Division 1, UCL-30 through UCL-52.

8.5 Covered Electrode Storage

8.5.1 All flux covered electrodes shall be clean and dry before use.

8.5.2 Low hydrogen electrodes (EXX15, 16, 18, 28) and (EXXX15, 16, 18) shall be kept in their sealed, undamaged shipping containers or stored in heated ovens to ensure their low hydrogen characteristics are maintained. The oven

(14)

welding electrode storage and it will be kept in proper working order. Electrodes of the EXXX15, 16, or 18 class shall be used within 1 hour after removal from their sealed container or the oven. Electrodes of the EXX15, 16, 18, or 28 class shall be used within 4 hours after removal from their sealed container or the oven.

8.5.3 Stainless steel, nickel base, and cobalt base alloy electrodes shall be kept in sealed containers or stored in heated ovens at 300°F ± 50°F. They shall be used within 4 hours after removal from their container or the oven.

8.5.4 All other electrodes shall be stored in a clean dry area in a manner to maintain their original condition and to minimize the possibility of mixing electrode types. 8.5.5 Material not conforming to these handling requirements shall be discarded or

re-conditioned per the manufacturer's recommendations. 8.6 Dissimilar Metal Welds

8.6.1 Austenitic filler metals deposited onto ferritic steels, and conversely, are dissimilar metal welds (DMWs). One of the most common DMWs is with 309 filler metal welded onto ferritic steels. The 309 presents two issues when welded onto ferritic steels: 1) carbon diffusion out of the ferritic steel into the 309, and 2) different coefficients of thermal expansion (CTEs).

8.6.2 At temperatures of about 750°F and up, the higher chromium content of the 309 causes carbon to diffuse from the ferritic steel into the 309, which creates a narrow, low carbon zone (LCZ) in the ferritic steel along the weld fusion line. The LCZ is lower strength than the ferritic steel and, depending on the service environment, may be subject to either creep or corrosion fatigue failure

(15)

FIGURE 2 – Dissimilar Metal Weld (DMW) cracking

8.6.3 The 309 has a higher CTE than that of ferritic steels. Inco 82 is a high nickel filler metal that has a CTE that is between that of austenitic and ferritic base metals.

8.6.4 For DMWs at service temperatures below 750°F use Col BC in Table I.4 (Inco 82 or Inco 182). Col BC will mitigate the effects of differential CTEs. Whenever PWHT is required, minimum time at PWHT temperature is recommended to reduce the effects of carbon diffusion.

8.6.5 DMWs at higher temperatures require Col BT in Table I.4 (EPRI P87 filler metal), in order to mitigate the effects of both carbon diffusion and differential CTEs.

8.7 Electrical Characteristics and Meter Calibration - To ensure that welders, welding operators and inspectors can determine the electrical characteristics of automatic and semi-automatic welding operations, an ammeter and a voltage meter shall be provided for determining the arc welding amperage and voltage output of the welding equipment.

8.7.1 The calibration points shall be as follows:

 Ammeter: Zero and maximum at 50 ampere intervals;

 Voltmeter: 5 volt increments from the minimum to the maximum qualified values.

8.7.2 Instrument accuracy shall be plus or minus five percent of maximum meter readings.

(16)

Calibration shall be traceable to NIST standards or other suitable national standards if outside the United States.

8.8 Flux Control - Flux shall be stored in its sealed shipping containers in such a manner that the material is protected against exposure to moisture pick-up. This includes both warehouse storage and transportation. If moisture pick-up is suspected, the flux shall be discarded or dried in accordance with the manufacturer's recommended practice before the material is put in service. The distribution of flux with pneumatic equipment must be with a cleaned, dried and filtered air supply system. Flux that was fused during welding shall not be recovered and re-used.

8.9 Full Penetration Welds

8.9.1 The use of backing rings is prohibited.

8.9.2 Open root welds shall employ a GTAW root pass with or without a consumable insert, or a GMAW root pass without a consumable insert.

8.9.3 Backside inert gas shielding shall be employed for the root pass and not less than the next two layers of all open root welds in stainless steel pipes, and as required to provide acceptable root pass surface contours and freedom from oxides in low alloy steels.

8.9.4 Where single-welded full penetration joints are used, particular care shall be taken in aligning and separating the piping components to be joined so there will be complete penetration and fusion at the bottom of the joint for its full length.

8.9.5 Where double welded full penetration joints are used, the reverse side shall be prepared by grinding or machining to sound metal, which shall be verified by magnetic particle or liquid penetrant inspection, before weld metal is deposited from the second side.

8.10 GMAW-S and GMAW-MS

8.10.1 GMAW-S is a non-wave-form controlled, short arc mode of metal transfer that is not allowed for piping welds.

8.10.2 GMAW-MS is a modified short arc mode that is produced by a software-driven power source with active voltage-sensing, synergic wave form control. GMAW-MS may be allowed for the root and hot passes of full penetration welds with the following restrictions:

(17)

of fusion.

 Semiautomatic GMAW-MS (hand held torch) shall be in the 1GR or 3GR position.

 Welder qualification shall be by bend testing.

 Each pass made with GMAW-MS shall be visually inspected prior to making additional passes. When the ID is accessible, the ID of the root pass shall also be visually inspected.

8.11 Heat Treatment

8.11.1 The holding temperature and material thickness requirements for post weld heat treatment shall be as follows, unless otherwise approved by MPE.

TABLE 2 – Heat Treat Hold Temperatures

Material Notes Temperature

P-1 1, 2 1125°F P-3 1, 3 1125°F P-4 1, 4, 7 1325°F P-5A 1, 5, 7 1325°F P-15E 1, 7 1375°F P-6 1, 6, 7 1375°F P-7 1 None P-8 1 None 1-1 1/2 Cr, 1-1 1/2 Mo, 1/4-1/2V 1275°F

Fe, Co & Ni Base Super Alloys Contact MPE for guidance NOTE 1 - The P number refers to the grouping of materials by the ASME Boiler and Pressure Vessel

Code, Section IX.

NOTE 2 - Post weld heat treatment of P-1 materials is required when thickness exceeds 3/4 inch.

NOTE 3 - Post weld heat treatment of P-3 materials is required when the thickness exceeds 3/4 inch. Heat treatment is required for all thicknesses of P3 materials whose specified minimum base metal tensile strength exceeds 71,000 psi.

NOTE 4 - Post weld heat treatment of P-4 materials is required when thickness exceeds 1/2 inch, and for all thicknesses when the specified minimum base metal tensile strength exceeds 71,000 psi. NOTE 5 - Post weld heat treatment of P-5A materials is required when thickness exceeds 1/2 inch, and for

all thicknesses when either (1) the chromium content exceeds 3%, or (2) the carbon content exceeds 0.15%.

NOTE 6 - Post weld heat treatment of P-6 materials shall be done at 1375°F, except A240 Gr. 429 and A268 Gr. 429 which shall be heat treated at 1200°F.

NOTE 7 - When heat treatment of welds, other than longitudinal, is required for quenched and tempered materials, the maximum heat treatment temperature shall be at least 50F below the tempering temperature of the material. Longitudinal welds in materials with tensile properties enhanced by a quench and temper heat treatment shall be re-heat treated in accordance with the applicable material specification.

(18)

weld heat treatment. The thickness to be used shall be that of the thicker piping component measured at the weld joint except as follows:

(a) Branch Connections - Heat Treat Thickness Provisions - Metal (other than weld metal) added as reinforcement, whether integral or attached, shall not be considered in determining heat treatment requirements. Heat treatment is required, however, when the thickness through the weld in any plane through the branch is greater than twice the minimum material thickness requiring heat treatment, even though the thickness of the piping components at the joint is less than the minimum thickness. Thickness through the weld for the details shown in Appendix II shall be computed using the following formulas:

Fig. P12 = Tb + tc Fig. P13 = Th + tc

(b) Slip-on and Socket Flange Fillet Welds - Heat Treat Thickness

Provisions - Heat treatment requirements that follow are applicable for fillet welds at:

 slip-on and socket welding flanges and piping connections NPS 2 and smaller,

 seal welding of threaded joints in piping NPS 2 and smaller, and

 attachment of external non-pressure parts such as lugs or other pipe supporting elements in all pipe sizes.

Heat treatment is required when the thickness through the weld in any plane is more than twice the minimum material thickness requiring heat treatment (even though the thickness of the piping components at the joint is less than that minimum thickness) except as follows:

(1) not required for P-No. 1 materials when weld throat thickness is 5/8 inch or less, regardless of base metal thickness;

(2) not required for P-No. 3, 4, or 5A materials when weld throat thickness is 1/2 inch or less, regardless of base metal thickness, provided that not less than the recommended preheat is applied, and the specified minimum tensile strength of the base metal is less than 71,000 psi.

(19)

welded joints between dissimilar ferritic metals, or between ferritic metals using dissimilar ferritic filler metal, shall be at the higher of the temperature ranges for the materials in the joint. However, cognizance must be taken of the lower critical transformation temperatures of both materials so that heat treatment at a relatively high temperature specified for one material does not exceed the lower critical temperature of the other one. Welded joints including both ferritic and austenitic piping components and filler metals or ferritic and iron, cobalt and nickel base super alloys and filler metals shall be heat treated as required for the ferritic material or materials unless otherwise specified in the engineering design.

8.13 Interpass Cleaning - All visible defects such as cracks, unfused areas, overlap, high spots, poor bead contour, undercut, porosity or any other condition which might detrimentally affect weld quality shall be corrected before the next weld bead is deposited. The area shall be chipped out, ground or otherwise removed to sound metal before re-welding. Slag and loose spatter shall be removed from each weld bead and adjacent surfaces before a succeeding bead is deposited. Arc craters in completed welds shall be filled to provide a uniform cross-section for the entire weld length. Care shall be taken not to damage the remaining weld preparation or

adjacent base metal.

8.14 Peening - Peening shall not be performed without MPE approval, and when used shall be included as a nonessential variable in the weld procedure. Cleaning of welds with chipping hammers or needle descalers used to remove flux and slag is not considered peening, as long as the weld metal is not deformed by such action on the final weld cap pass.

8.15 Preheat and Interpass Temperature

8.15.1 Table 3 stipulates the minimum preheat requirements for welding Gas Turbine piping. When conformance to other codes is required by the customer or local prevailing regulations, the specific requirement shall be identified on the drawing or in the ordering sheet and shall take precedence, but shall not be less than that specified in Table 3.

8.15.2 There shall be no welding on any pipe whenever the pipe is not within the specified minimum preheat temperature and the specified maximum interpass temperature. When it is not feasible to uniformly preheat the part, local heating may be performed in such a manner that the heated area completely surrounds the welded area for a minimum of three inches.

(20)

Material Category (Note 1) Minimum Preheat Interpass

P1 (Low Carbon Steel) 50F for t 1 in. or TS 71 ksi 750°F 175F for t  1 in. or TS 71 ksi

P3 (C - 1/2 Mo) 175F (UTS > 70 KSI or t > 1/2 inch) 750°F

50F for all others 750°F

P4 (1-1/4 Cr - 1/2 Mo) 300F (Note 4) 750°F

P5A (2-1/4 Cr - 1 Mo) 350F (Notes 2 and 4) 750°F

P15E (9Cr-1Mo-V-Nb) 400F (Notes 2 and 4) 750°F

P6 (410SS) 400F (Note 4) 600°F

P7 (405SS, 409SS) 50F 750°F

P8 (304SS, 310SS) 50F 350°F

1-1 ½ Cr, 1-1 ½ Mo, ¼ - ½ V 450F (Note 3) 750°F

Fe, Co & Ni Base Super Alloys 50F 350°F

Note 1 - The P number refers to the grouping of materials by the ASME B&PVC Section IX. For GE materials not listed in ASME Section IX, contact MPE for equivalent P numbers. Note 2 - Precautions shall be taken to assure slow cooling of pipes if preheat is not maintained until the

start of post weld heat treatment. Cooling in still air is acceptable if ambient temperature is above 50°F. If low ambient temperatures, drafts, or other conditions that could produce detrimental effects exist, the welded regions shall be suitably insulated, or be held at 400°F to 700°F for at least 2 hours prior to cooling.

Note 3 - Preheat shall be maintained until the start of stress-relief treatment.

Note 4 - Materials with carbon contents greater than 0.15% or chromium greater than 3% shall be maintained at preheat until the start of post weld heat treatment, or be held at 400°F to 700°F for 2 hours minimum before cooling after completion or interruption of welding.

8.16 Pressure-Tight Welds - Pressure-tight welds shall be made with a minimum of two layers wherever possible. Where it is impractical to use two layers, any interruptions in the weld layer (starts or stops) should be carefully made to avoid leaks. In the case of the shielded metal arc process, for instance, the weld shall be back stepped in increments not exceeding the length of weld deposited with one electrode. The end of each bead shall overlap the preceding bead by approximately 1/2 inch and the crater shall be reduced to a minimum.

8.17 Repairs

8.17.1 Welds which do not meet the minimum specified acceptance standards shall have the defects removed and be weld repaired if necessary.

8.17.2 Defects must be removed only to the extent that the weldment is acceptable upon re-inspection by the same method that originally disclosed the defect prior to weld repair.

(21)

the original weld unless otherwise approved by MPE or the GE Plant Welding Engineer.

8.17.4 The repaired areas shall be re-inspected by the same method or methods, and shall be evaluated using the same acceptance standards that were originally used and applied to inspection of the weld.

8.17.5 Weld repairs to base metal areas require approval via the SDR / QCR process. 8.18 Seal Welds - Seal welding shall be done by a qualified welder. Where seal welds are

employed, they shall cover all exposed threads. 8.19 Stress Relief Cycle

8.19.1 Furnaces shall be calibrated per P10A-AG2.

8.19.2 All parts shall be free of foreign material such as dirt, oil, grease, etc. before stress relief.

8.19.3 Each furnace charge shall have a minimum of 2 thermocouples placed in direct contact with the metal so as to adequately monitor the temperature of the anticipated hottest and coldest sections. Alternate method of furnace control may be used if approved by MPE or the GTO Materials Engineer.

8.19.4 All temperatures refer to metal temperature, not gas temperature. 8.19.5 The tolerance on temperatures shall be ± 25°F.

8.19.6 Parts shall be placed in the furnace at a temperature not exceeding 800°F, or 500°F more than the temperature of the weldment, whichever is less.

8.19.7 The temperature shall be raised and lowered uniformly at a rate not exceeding the following:

TABLE 4 – Heating and Cooling Rates Metal Thickness (inches) Maximum Rate (°F/Hr.)

0-1 400

2 200

3 135

(22)

hour minimum for parts less than 1 inch thick except as noted hereafter. 4, P-5A, P-5B, or P-6 materials that require heat treatment as specified in Table 3 shall be heat treated with a minimum holding time of 2 hours at temperature. 8.19.9 The weldment may be removed from the furnace when the temperature has

fallen below 600°F.

8.19.10 When an entire piping assembly cannot be fit into the furnace, it is permissible to heat treat in more than one heat provided there is at least one foot overlap between successive heats and the parts of the assembly outside of the furnace are protected from harmful temperature gradients.

8.19.11 The required stress relief may be performed by local heating operations provided the procedure is approved by MPE or the GTO Materials Engineer. 8.20 Tack Welds - Tack welds that are to remain in the weld shall be made only by

qualified welders in accordance with a qualified procedure. Tack welds at the root of pipe joints shall be made with filler metal equivalent to that used in the root pass. Cracked or defective tack welds shall be removed prior to final welding. Tack welds shall be kept small or shall be tapered by chipping, grinding or burring to assure complete fusion with the subsequent weld.

8.21 Weld Filler Metal - The weld filler metal shall be identified by column letter

designation per Appendix I or by GE or AWS specification. It can be specified in the tail of the welding symbol or as a drawing note. If not designated on the drawing, weld filler metal shall be per Appendix I, or as approved by MPE Fabrications. 8.22 Weld Joint Cleanliness

8.22.1 Surfaces to be welded or thermally cut shall be cleaned of all foreign material such as grease, oil, dirt, scale, slag and paint that would be detrimental to either the weld or base material. The region cleaned shall include all of the joint preparation surfaces and shall extend for a distance not less than 1 inch from the edge of the joint preparation.

8.22.2 Care shall be taken when using chemical cleaning processes that the base metal is not adversely affected by intergranular attack, alloy depletion, or intergranular oxidation. Chemical cleaning techniques shall be referred to MPE for evaluation.

(23)

8.23.1 General - The weld joint design shall be per the figures in Appendix II of this specification and the qualified and approved WPS. A welding procedure specification shall be submitted to change joint designs.

8.23.2 Branch Connections - Piping unreinforced branch connections which abut the outside of the run or are inserted in the opening in the run shall be attached by fully penetrated groove welds. The welds shall be finished with cover fillet welds having a throat dimension not less than the lesser of 0.7T (T is the branch pipe wall thickness) or 1/4 inch. Basic joint details are shown in Appendix II Figures P12 and P13.

Branch connections which employ integrally reinforced branch connection fittings shall be attached by full penetration groove welds and be finished with cover fillet welds that meet the requirements of Appendix II Figure P14. The transverse reinforcing branch fillet shall fill and match with a smooth transition to the fully penetrated weld matching the specific fitting.

8.23.3 Fabricated Laps - Joint designs for piping assembly fabricated laps shall be in accordance with Appendix II Figures P15, P16, P17, P18, or P19.

8.23.4 Sleeve Joints - Welded sleeve joints are not permitted in pressure piping

applications. For other appilications, this joint type shall be approved by Design Engineering and specifically detailed on the engineering drawings.

8.24 Weld Joint Preparation

8.24.1 All surfaces to be welded shall be suitably prepared. Undercuts, gouges and obstructions shall be blended free of re-entrant angles to be suitable for magnetic particle or liquid penetrant inspection. Cracks and laminations shall be removed, except laminations may be weld repaired per the requirements of this specification after removal to a depth of 3/8 inch from the weld prep

surface.

8.24.2 When non-ferrous alloys are cut by thermal processes, the reaction layer shall be removed by mechanical means to bright metal.

8.24.3 When ferrous alloys are cut by thermal processes, those materials which require preheat for welding shall have the reaction layer removed by mechanical means to bright metal.

(24)

8.25.1 The welding positions shall be as defined in Section IX of the ASME B&PVC. 8.25.2 Welding shall be done in the flat position whenever practical.

8.25.3 The progression of welding in the vertical position shall be upward unless the base metal thickness is 1/8 inch or less.

8.26 Weld Weave Limitations - The weld weave limitations for SMAW shall not exceed three (3) times the electrode core diameter for P-1, P-3, P-4, P-5A or P-5B materials, except with the vertical up technique, the weave may be up to 6 times the core diameter. The SMAW electrode weave limitations for all other materials shall not exceed two (2) times the electrode diameter. For other welding processes, the electrode weave shall not exceed 5/8 inch without prior evaluation by MPE, or by Gas Turbine Quality Assurance, of workmanship samples suitably examined to determine that weld quality standards can consistently be met.

8.27 Welder Identification on Production Welds

8.27.1 Each welder and welding operator shall stamp the identification mark assigned to him/her at three foot or smaller intervals within 1 inch of each weld she/he deposits.

8.27.2 Stamped identification of thin wall (less than 1/8 inch) parts shall not be done unless specifically requested on the drawing.

8.27.3 As an alternate to stamping, the Supplier may keep a record of the amount and location of welds made by each welder and welding operator.

9. INSPECTION/TEST PROCEDURES AND REQUIREMENTS

9.1 Required Inspections - Required inspections are per designated lot of material as defined by GE Gas Turbines Manufacturing or by each Supplier, and approved by Product Quality Engineering or by GE Sourcing Quality.

9.1.1 CODE N INSPECTION - Piping for Normal Fluid Service Conditions as defined by 351A3700; i.e. service conditions not covered by ASME B31.3, Category D Fluid Service, or Piping for Severe Cyclic Conditions, or Piping for Category M Fluid Service, or High Pressure Piping; shall be examined and certified to the extent specified as follows:

(25)

components, selected at random, to satisfy the examiner that they conform to specifications and are free from damage.

9.1.1.2 All welds shall be visually examined. The GE Gas Turbine Manufacuring organization shall use Characteristic Verification Program Operators to verify visual examinations.

9.1.1.3 Longitudinal welds required to have an ASME B31.3 joint factor E of 0.90 shall be subjected to spot radiographic examination of at least 1 foot in each 100 feet of weld for each welder or welding operator. Weld lengths radiographed shall be identified by NDE stamp.

Note: Random or spot examination will not ensure a fabrication product of a prescribed quality level throughout. Items not examined in a lot of piping

represented by such examination may contain defects which further examination could disclose. Specifically, if all radiographically disclosable weld defects must be eliminated from a lot of piping, 100% radiographic examination must be specified. (B31.3, para. 344 footnote 3.)

9.1.1.4 Random visual examination shall be made during piping erection, including checking of alignment, supports, and cold spring.

9.1.1.5 Visual examination of erected piping shall be made for evidence of damage that would require repair or replacement and for other evident deviations from the intent of the design.

9.1.1.6 Not less than 5% of circumferential butt and miter groove welds shall be examined fully by random radiography or random ultrasonic examination. Welds to be examined shall be selected to ensure that the work of each welder or welding operator doing the production welding is included. They shall also be selected to maximize coverage of intersections with

longitudinal joints. At least 1 ½ inch of the intersecting longitudinal welds shall be examined. Welds that have been ultrasonically examined or radiographed shall be identified by NDE stamp.

In-process examination may be substituted for all or part of the

radiographic or ultrasonic examination requirements on a weld-for-weld basis if specified in the engineering design.

represented by such examination may contain defects which further examination could disclose. Specifically, if all radiographically disclosable weld defects must

(26)

9.1.1.7 The Supplier shall be assured, by examination of certifications, records, and other evidence, that the materials and piping components are of the specified grades, and that they have received required heat treatment, examination, and testing. The Supplier shall provide the Purchaser (and/or GE's Customer Representative, when available) with a certification that all the quality control requirements of the Code and of the engineering design have been met.

9.1.2 CODE D INSPECTION - All welds in piping for Category D Fluid Service as designated in 351A3700 shall be 100% visually examined to satisfy that piping components, materials, and workmanship conform to the requirements of ASME B31.3, the engineering design, and the visual acceptance criteria for Category D Fluid Service Welds in Table 5 herein. GE Gas Turbine

Manufacturing Organization shall use Characteristic Verification Program Operators to verify visual examinations.

9.1.3 Inspections after Heat Treatments - Inspections of P-Nos. 3, 4, and 5 materials shall be performed after completion of any heat treatment. Welds not

accessible for inspection after final heat treatment shall be given an

intermediate post weld heat treatment and be inspected immediately prior to the assembly operation that causes the inaccessibility.

9.1.4 Welded Branch Connection - Examination and all required repairs to the pressure containing weld of a welded branch connection shall be completed before any reinforcing pad or saddle is added.

9.2 Defective Work and Progressive Sampling

9.2.1 An examined item with one or more defects that exceed the acceptance criteria shall be replaced or repaired in conformance with 8.17 and the new work shall be re-examined by the same methods, to the same extent, and by the same acceptance criteria as required for the original work.

9.2.2 When required spot or random examination reveals a defect, additional examinations and corrective repair shall be made in accordance with ASME B31.3, para. 341.3.4 (Progressive Sampling for Examination), as follows:

(a) two additional items of the same kind welded by the same welder or operator from the original designated lot shall be given the same type of examination; and

(27)

repaired or replaced and re-examined in accordance with 9.2.1, and all items represented by this additional examination shall be accepted; but (c) if any of the items examined as required by (a) reveals a defect, two

further samples of the same kind shall be examined for each defective item found by that sampling; and

(d) if all the items examined as required by (c) are acceptable, the defective item(s) shall be repaired or replaced and re-examined as specified in 9.2.1, and all items represented by this additional examination shall be accepted; but

(e) if any of the items examined as required by (c) reveals a defect, all items represented by the progressive examination shall be either:

(1) Repaired or replaced and re-examined as required, or

(2) Fully examined and repaired or replaced as necessary, and re-examined as necessary to meet the requirements of this specification.

represented by such examination may contain defects which further examination could disclose. Specifically, if all radiographically disclosable weld defects must be eliminated from a lot of piping, 100% radiographic examination must be specified. (B31.3, para. 344 footnote 3.)

9.2.3 All applicable non-destructive evaluation (NDE), including leak testing, is required to be re-applied whenever a piping component has been subject to rewelding and/or re-heat treatment after initial NDE and or leak testing. 9.3 In-Process Examination

9.3.1 Piping assemblies that cannot be suitably subjected to radiographic or ultrasonic audit examination as required may be in-process examined on a weld-for-weld basis if specified in the engineering design

9.3.2 In-process examination comprises examination of the following, as applicable: (a) joint preparation and cleanliness;

(b) preheating;

(c) fit-up, joint clearance, and internal alignment prior to joining;

(d) variables specified by the joining procedure including electrode, filler metal, and position;

(e) condition of the root pass after cleaning -- both external and, where accessible, internal -- aided by liquid penetrant or magnetic particle

(28)

(f) slag removal and weld condition between passes; and (g) appearance of the finished joint.

9.3.3 The method of in-process-examination is visual in accordance with ASME B&PVC, Section V., Article 9.

9.3.4 Acceptance criteria are as stated for the applicable category of visual examination herein and in the engineering drawing.

9.3.5 Records of in-process-examinations are required. 9.4 Inspection Personnel

9.4.1 Inspectors shall have training and experience commensurate with the needs of the specified inspections (SNT-TC-1A Recommended Practice for NDT

Personnel Qualification and Certification, may be used as a guide). As a minimum, all inspection personnel, except visual, shall be Level 2. For visual inspection of welds, AWS B1.11 may be used as a guide. The employer shall certify and maintain records of the inspectors employed, showing dates and results of personnel qualifications. These records shall be maintained by the Supplier for 5 years after completion of fabrication.

9.4.2 In-process examinations, excluding visual examination, shall be performed by personnel other than those performing the production work.

9.5 Inspection Methods

9.5.1 The inspection methods shall be in accordance with the following

specifications. Inspection procedures shall be maintained by the Supplier for five years after completion of fabrication.

Visual - ASME Boiler and Pressure Vessel Code, Section V, Article 9.

Radiography - ASME Boiler and Pressure Vessel Code, Section V, Article 2. Magnetic Particle - ASME Boiler and Pressure Vessel Code, Section V, Article 7.

Liquid Penetrant - ASME Boiler & Pressure Vessel Code, Section V, Article 6. Ultrasonic - ASME Boiler and Pressure Vessel Code, Section V, Article 5.

(29)

9.6.1 Welds shall be inspected using acceptance standards specified herein. These standards meet or exceed those of ASMEB31.3 for Normal Fluid Service Conditions and Category D Fluid Service piping.

TABLE 5 – Inspection Acceptance Criteria: RT and VT

Category D and Normal Fluid Service (Only Visual Inspection Required for Category D)

IMPERFECTION RT VISUAL ACCEPTANCE CRITERIA

CRACK X X Zero (No evident imperfection permitted) LACK OF FUSION X X Zero (No evident imperfection permitted) INCOMPLETE

PENETRATION

X X Zero (No evident imperfection permitted)

INTERNAL POROSITY X --- Per B&PV Code, Sec VIII, Division 1 Appendix 4 SLAG INCLUSION OR

ELONGATED INDICATION

X --- Max of 2Tw Long; Max. of 0.125 inch or 0.5Tw wide, whichever is smaller. Cumulative length: Max. of 4Tw in any 6.0 inch length.

UNDERCUTTING --- X Max. of 0.03 inch or 0.25Tw, whichever is smaller. (2) SURFACE POROSITY OR

EXPOSED SLAG INCLUSION

--- X Zero (No evident imperfection permitted)

CONCAVE ROOT SURFACE

X X Total joint thickness, including weld reinforcement greater than or equal to Tw

REINFORCEMENT (1) OR INTERNAL PROTRUSION

--- X 0.062 inch Max. up to Tw of 0.250 inch 0.125 inch Max. over Tw of 0.250 inch

WORKMANSHIP --- X Grinder marks, gouges, cold laps, non-uniform fill, or other questionable stress risers in the weld or in the adjacent piping is not permitted and shall be blended or polished smooth. Blending may not reduce the pipe wall below Tw.

(1) REINFORCEMENT LIMITS ARE DOUBLE ABOVE VALUES FOR CATEGORY D PIPE (2) NO UNDERCUTTING PERMITTED FOR LONGITUDINAL GROOVE WELDS (ALONG PIPE AXIS)

Tw = Pipe wall thickness, minimum

TABLE 6 – Inspection Acceptance Criteria: MT and PT Category D and Normal Fluid Service

IMPERFECTION MT PT ACCEPTANCE CRITERIA

(30)

Category D and Normal Fluid Service

Indications are unacceptable if the amplitude exceeds the reference level established by the basic calibration block for ultrasonic examination of welds as stipulated in ASME Boiler and Pressure Vessel Code, Section V, Article 5, and the lengths exceed the following:

1/4 in. for T up to 3/4 in.

Where T is the thickness of the weld, or thinner member when parts of unequal thickness are butt welded together. 1/3T for T from 3/4 in. to 2-1/4

in.

3/4 in. for T over 2-1/4 in. where

Where indications are interpreted as cracks, lack of fusion, or lack of penetration, they are unacceptable regardless of length.

TABLE 8 – Inspection Acceptance Criteria: Additional Visual

IMPERFECTION RT VISUAL ACCEPTANCE CRITERIA

SURFACE FINISH --- X Workmanship appearance, smooth and uniform WELD CONTOUR --- X Feather edge transition into base metal,

absence of sharp edge and no indication of cold lap.

WELD WEAVE OR STRINGERS

--- X Small uniform size leaving smooth contour without any sharp edges/notches.

WELD WIDTH & SIZE --- X Changes within limits to be gradual. WELD SPATTER AND

SLAG

--- X Weld and adjacent base metal to be visually free from slag and weld spatter.

9.7 Hardness Tests

9.7.1 Hardness tests shall be conducted on piping assemblies of P-Nos. 3, 4, 5A, 5B, 15E, and 6 materials, after heat treatment.

9.7.2 Hardness tests of production welds and of hot bent and hot formed piping are intended to verify satisfactory heat treatment. The hardness limit applies to the weld and to the heat affected zone (HAZ) tested as close as practicable to the edge of the weld.

9.7.3 When dissimilar metals are joined by welding, the hardness limits specified for the base and welding materials shall be met for each material.

(31)

materials in each furnace heat treated batch, and 100% of those locally heat treated, shall be tested. The maximum hardness in the weld and heat affected zone (tested as close as practicable to the edge of the weld) shall be as specified herein. Brinell tests shall not be performed on pipes smaller than 2 inch O.D. or with wall thickness less than 0.2 inch.

TABLE 9 – Hardness Limitations Base Metal

P-Number

Weld Metal Analysis

A-Number Base Metal Group Brinell Hardness, Max.

3 2, 11 C - ½ Mo 225 4 3 1 ¼ Cr - ½ Mo 225 5A 4, 5 2 ¼ Cr - 1 Mo 241 15E 5 9 Cr - 1 Mo - V - Nb 279 6 6 410 SS 241 9.8 Leak Tests

9.8.1 The standard factory performance testing shall serve as the standard leak test for all gas turbine piping systems on units and associated peripheral

skids/hardware except as follows.

9.8.2 Fuel gas and steam injection piping will be hydrostatically tested as individual fabrications at a pressure at least 1.5 times the respective design pressure. Refer to the job specific hydrostatic testing specification, typically MLI 0204 or an equivalent specification.

9.8.3 Paras. 9.8.1 and 9.8.2 are noted exceptions to ASME B31.3 requirements. Inclusion of the hydrostatic leak test requirement on GE Gas Turbine piping and accessory systems piping is an optional feature when customer-specified. Hydrostatic testing (or pneumatic) is a requirement for European PED

Compliance for Category I, II, and III piping. Refer to the specific GE drawings or specifications for notes and other criteria for PED compliance.

9.8.4 GE shall advise the piping or equipment Supplier in writing when hydrostatic tests or witnessing by the customer is required.

9.8.5 The ASME B31.3 Alternative Leak Test in accordance with paragraph 345.9 may be used where required subject to the conditions specified by the Code.

(32)

part requires a Leak test.

10. NOTES

None

(33)

I-1 Scope

This section on filler metal selection is provided as a consideration when other directions or specifications are not provided.

I-2 Use of Filler Metal Tables

To use the Filler Metal Selection Tables I.1-I.3, locate the row of the first base metal to be joined and the column of the second base metal to be joined. The intersect of the column and row gives the recommended Filler Metal Column to be used for that base metal combination. If the box is on the top-right half of the table, switch the column and row as only half of the table is filled in to prevent duplication. If no filler metal is listed for a particular combination, contact MPE to determine correct filler metal.

I-3 Use of Filler Metal Columns

Once a Filler Metal Column is determined from Tables I.1 through I.3, use Table I.4 to determine the acceptable filler metals for that Column.

Unless the process is specified on the engineering drawing, Weld Filler Metals in the same Column may be used interchangeably provided that (1) there is a qualified

procedure for that class of filler and process, (2) the electrode and process are suitable for use in the intended welding position and within any limitations imposed on joint accessibility by component configuration, and (3) consideration has been given to the advisability of use of low carbon version of electrodes to avoid intergranular carbide precipitation and reduced weld corrosion resistance, or to avoid lower weld creep and rupture strength that may result from use of the low carbon versions. MPE shall be consulted regarding the details of items (2) and (3).

(34)

ASME

No. P1 P3 P3 P4 P5A P15E P11 P6 P7

BASE METAL WELDED TO Low Carbon Steel Corten ½ Mo 1 Cr- ½ Mo and 1¼ Cr- ½ Mo 2¼ Cr- 1Mo Grade 91 T-1 403, 410 405, 409

P1 Low Carbon Steel AB

P1 Low Carbon Steel -

Low Temp Service AD

P3 Corten AB AB P3 ½ Mo AB AB AG P4 1 Cr- ½ Mo and 1¼ Cr- ½ Mo AB AB AI P5A 2¼ Cr- 1Mo AB AB AL BT P15E Grade 91 BK BK P11 T-1 AB AN P6 403, 410 AB/AT AS AS P7 405, 409 AB/AT BT P8 304 Note 3 BT BT P8 304L Note 3 BT BT P8 309, 309S, 310 Note 3 BT BT P8 316 Note 3 Note 3 BT BT P8 316L Note 3 Note 3 BT BT P8 321, 347 Note 3 BT BT P42 Monel 400 BD BT P43 Inconel 600 BC BT P43 Inconel 625 BI P45 Incoloy 800 BC - X40, X45, FSX-414 BA

(35)

ASME No. P8 P8 P8 P8 P8 P8

BASE METAL WELDED TO 304 304L 309, 309S, 310 316 316L 321, 347

P15E Grade 91 BT BT BT BT BT

P8 304 AE

P8 304L AE-L

P8 309, 309S, 310 AE AE-L AU/AF

P8 316 AH AH-L AH

P8 316L AH-L AH-L AH-L

P8 321, 347 AE-L AE-L BE

P43 Inconel 625 BI

(36)

ASME No. P42 P43 P43 - P43 P45 BASE METAL WELDED TO 19-9DL Monel 400 Inconel 600 Hastelloy X RA333 Inconel 625 Incoloy 800 Inconel 718 N-155 L-605 X40, X45, FSX-414 P8 321, 347 BC - 19-9 DL AP P42 Monel 400 BD P43 Inconel 600 BC P43 Hastelloy X AZ AZ BC - RA333 AZ AZ BC P43 Inconel 625 BI P45 Incoloy 800 BC BC Inconel 718 BJ N155 AQ L 605 BA - X40, X45, FSX-414 BC BC AO

(37)

Code NOTES GE Spec Industry Spec ASTM/ASME Classification ASME F-No. UNS No. Trade Name AA

B21B10A A5.1 E6010 3

B21B10B A5.1 E6020 1

B21B10D A5.1 E6013 2

B21B40A2 A5.1 E7016 4

B21B89A A5.1 E6027 1

B21B81A A5.1 E7018 4

None A5.1 E7018-1 4

None A5.17 F6A2-EL8K 6

None A5.17 F6A2-EL12 6

None A5.17 F7A2-EM12K 6

None A5.17 F7A2-EM13K 6

B50A631B,C A5.20 E70T-1 6

B50A631D,E A5.20 E71T-1 6

B21B126C1 A5.20 E70T-4 6

B21B126C2 A5.20 E70T-G 6

None A5.20 E70T-6 6

B21B90B A5.18 ER70S-2 6

B21B60 A5.18 ER70S-3 6

None A5.18 ER70S-4 6

(38)

Code NOTES GE Spec Industry Spec ASTM/ASME Classification ASME F-No. UNS No. Trade Name AB

B21B40A2 A5.1 E7016 4

B21B81A A5.1 E7018 4

None A5.1 E7018-1 4

None A5.17 F7P2-EM12K 6

None A5.17 F7P2-EM13K 6

None A5.17 F7P2-EH14 6

None A5.20 E71T-1C 6

B21B103 A5.20 E70T-1 6

B21B153 A5.20 E71T-1 6

B21B152 A5.20 E70T-5 6

B21B90B A5.18 ER70S-2 6

None A5.18 ER70S-4 6

B21B90D A5.18 ER70S-6 6

AD

None A5.5 E8016C1 4

None A5.5 E8018C1 4

None A5.23 F7A8-ENi2-Ni2 6

None A5.28 ER80S-Ni2 6

None A5.29 E80T1-Ni2 6

None A5.29 E81T1-Ni2 6

AE 2

B21B29 A5.4 E308-15/16 5

B21B101 A5.9 ER308 6

B21B144A1 A5.22 E308TX-Y 6

AE-L 2

B21B120 A5.4 E308L-15/16 5

B21B137 A5.9 ER308L 6

(39)

Code NOTES GE Spec Industry Spec ASTM/ASME Classification ASME F-No. UNS No. Trade Name AF 2

B21B34A A5.4 E310-15/16 5

B21B99 A5.9 ER310 6

None A5.22 E310TX-Y 6

AG

None A5.5 E7016-A1 4

None A5.5 E7018-A1 4

None A5.29 E70T5-A1 6

AH 2

B21B69 A5.9 ER316 6

B21B31 A5.4 E316-15/16 5

AH-L 2

B21B131 A5.4 E316L-15/16 5

B31B138 A5.9 ER316L 6

None A5.22 E316LTX-Y 6

AI

B21B54A2 A5.5 E8015/16-B2 4

B21B134A1 A5.5 E8018-B2 4

None A5.5 E8016-B2L 4

None A5.5 E8018-B2L 4

None A5.29 E80T5-B2 6

None A5.29 E80T5-B2L 6

B21B1507 A5.29 E80T1-B2 6

None A5.29 E81T1-B2 6

None A5.28 ER80S-B2 6

(40)

Code NOTES GE Spec Industry Spec ASTM/ASME

Classification ASME F-No. UNS No. Trade Name

AL

B21B44A2 A5.5 E9015/16-B3 4

B21B92A2 A5.5 E9018-B3 4

B21B156 A5.28 ER90S-B3 6

None A5.23 F9PZ-EB3-B9 6

None A5.29 E91T5-B3 6

None A5.29 E9XT1-B3 6

AN

B21B123A2 A5.1 E11018M 4

None A5.28 ER110S-1 6

None A5.29 E110T5-K4 6

None A5.29 E111T1-K4 6

AP B21B26 AMS 5782, A5.4 E349-15/16 5 19-9 W Mo

None AMS 5782, A5.9 ER349 6 19-9 W Mo

AQ B50A485 AMS 5795BM Multimet N-155

None AMS 5794A Multimet N-155

AR obsolete AS 1, 2

B21B35 A5.4 E410-15/16 4

B21B77 A5.9 ER410 6

AT 1, 2 A5.4 E410NiMo 4 A5.9 ER410NiMo 6 A5.22 E410NiMoTX-X 6 AU 2, 3 B21B33 A5.4 E309-15/16 5 B21B135 A5.9 ER309 6

AU-L 2, 3

B21B157 A5.4 E309L-15/16 5

None A5.9 ER309L 6

(41)

Code NOTES GE Spec Industry Spec ASTM/ASME Classification ASME F-No. UNS No. Trade Name AY obsolete

AZ B21B111 AMS 5798 ERNiCrMo-2 43 N06002 Hastelloy X BA B21B63B2 AMS 5797

B21B70 AMS 5796 R30605 L-605, Haynes 25

BC B21B88 A5.11 ENiCrFe-3 43 W86182 Inco 182

B21B110 A5.14 ERNiCr-3 43 N06082 Inco 82

BD None A5.11 ENiCu-7 42

None A5.14 ERNiCu-7 42

BE 2

B21B30 A5.4 E347-15/16 5

B21B17 A5.9 ER347 6

BH B50A824 None Mar-M918

BI AMS 5837, A5.14 ERNiCrMo-3 43 N06625 Inconel 625 BJ same as BB

BK 5

None A5.28 ER90S-B9 6

None A5.29 E100T1-B9M 6

None A5.23 F9PX-EB9-B9 6

None A5.5 E9015-B9 4

None A5.5 E9016-B9 4

BT 3, 6 EPRI P87

AMS 5786/5787 ERNiMo-3/ENiMo-3 44 N10004 Hastelloy W

NOTE 1 Weldments between 410 and Cr-Mo steels should be limited to applications where the operating temperature is below 950F (510 C).

NOTE 2 For FCAW electrodes, “X” may be 0 or 1, and “Y” may be 1 or 4 as appropriate for the qualified welding procedure.

NOTE 3 See the section titled Dissimilar Metal Welds in this specification.

NOTE 4 Haynes 556 is prone to microfissuring. The filler metal listed in Col BI or Col BL are much less prone to objectionable microfissuring.

NOTE 5 E9015-B9 is recommended over the E9016-B9 and E9018-B9, as it doesn't contain iron powder and so eliminates one source of contaminates.

NOTE 6 EPRI P87 is available from Euroweld. EPRI P87 is preferable to Hastelloy W because there is test data from EPRI for the P87 that is specific to dissimilar metal weld

applications. Hastelloy W chromium content is similar to EPRI P87, but it has not been tested for viability as a dissimilar metal weld.

(42)

PREFERRED WELD JOINT DESIGNS FOR PIPING WELDS

II.1 If a preferred weld preparation does not suit the required application, the weld preparation shall be described by the weld symbol.

II.2 Allowable tolerances on angles for weld preparation is + 2-1/2 unless otherwise stated.

II.3 Fig. P8 is special socket weld for fuel nozzle application; use on piping components is considerd a deviation from standard practice. Use of it requires the responsible Design Engineering organization’s approval.

II.4 Backing rings are not allowed (Fig. P2). II.5 Sleeve fabrications are not allowed (Fig. P3).

(43)

(44)

Joint Alignment Tolerances for Open Root Butt Welds1

B = 30° max G = 3/32 inch min to 5/32 inch max

D = 2 times offset O, min O = 1/16 inch max

E = Not to exceed amount permitted by W W = not less than minimum design thickness

F = Not less than 4 times E

(45)

Unreinforced Branch Attachment Welds

Fig - P12 Fig. - P13

Tb = Nominal Thickness, Branch.

tc = Throat Thickness, the lesser of 0.7Tb or 0.25 in (6mm) Th = Nominal Thickness, Header

NOTE: These sketches show minimum acceptable welds. Welds may be larger than shown here.

(46)

Integrally Reinforced Branch Outlet Fitting

Tb = Nominal Thickness, Branch.

tc = Throat Thickness, the lesser of 0.7Tb or 0.25 in (6mm) Th = Nominal Thickness, Header

W = Weld leg, the lessor of 1.4 tc or 0.35 in ( 9mm), but not less than 0.19 in (4.8mm)

Note 1: Inert gas backing required.

Note 2: Transverse Section, blend weld in to pipe, No undercuts permitted. The fillet size is determined base on leg not throat. The branch fillet weld must fill and match with as smooth rransition to the fully

penetrated weld matching the specific fitting.

Note 3: Refer to Figure P14.1 and P14.2 below for additional requirements and a weld pass example.

(47)

(48)

TYPICAL FABRICATED LAPS

c = Sum of mechanical allowances + corrosion or erosion allowances.

╤

= Normal Thickness, T2 = Lap Thickness

Laps shall be machined (front and back) or trued after welding. Plate flanges or lap joint flanges per ASME B16.5 may be used. Welds may be machined to radius, as in Fig. P19, if necessary to match B16.5 lap joint flanges.

P8A-AG3_U

Table of Contents

╤