WELDING SPECIFICATION SP4/1 ENGINEERING

Transcription

1 WELDING SPECIFICATION SP4/1 ENGINEERING WI37.MTS.104 Revision 4 Central Engineering (FORMERLY WI ) 1.0 PURPOSE This Work Instruction describes the process and system used to ensure that good engineering practice, and statutory requirements are met in regard to Welding. 2.0 SCOPE This applies to all forms of welding carried out on SIMEC Mining /Liberty OneSteel Whyalla Plant REFERENCES 3.1 MMI GFG Alliance Whyalla Management Manual. 4.0 DEFINITIONS Welding Officer Technical Officer Welding Practices Central Engineering C.E. Central Engineering I.T.P. Inspection and Test Plan sets out quality assurance controls, inspection points before and during manufacture / fabrication of items. These include but are not limited to materials certificates, dimensional checks, welding procedures, welder qualifications, painting and N.D.E. testing along with Witness, Surveillance and Hold Points. 5.0 PROCEDURE 5.1 Registration Liberty OneSteel Whyalla welding Specifications are registered with Engineering Records The Welding Officer is responsible for registering any new Liberty OneSteel Welding Specifications with Engineering Records. 5.2 Responsibility C.E. is responsible for the control and content of Welding Specifications Authority for changes and or new specifications is the Manager Engineering or their nominee. Any PRINTED copies of this procedure are UNCONTROLLED Page: 1 of 2

2 WELDING SPECIFICATION SP4/1 ENGINEERING WI37.MTS.104 Revision 4 Central Engineering 5.3 Issue of the Welding Specification to Contractors Controlled Copies of Welding Specifications are issued by the Supply Department to all local preferred Contractors. The Supply Department also issues current uncontrolled copies as appropriate to other Contractors on a job-by-job basis. 5.4 Updates/Revision to Welding Specification C.E. is responsible for any changes/updates being made to SP4/01. Records of changes will be kept Once changes have been made, authorisation for those changes is to be made by the Manager Engineering or their nominee. 6.0 DOCUMENTATION 6.1 Attachment 1 - Liberty OneSteel Whyalla - Welding Specification SP4/01. Any PRINTED copies of this procedure are UNCONTROLLED Page: 2 of 2

3 SIMEC Mining and Liberty Primary Steel WELDING SPECIFICATION SP4/01 REVISION 11 Revision Number Date 1 6/09/89 2 1/07/ /09/ /10/93 5 9/03/94 6 3/03/95 7 6/02/98 8 5/04/ /05/ /11/ /07/2009 Authorised:... Title:... Date:... WI37.MTS/104/1 9/08/2012 Page: 1 of 177

4 SIMEC Mining and Liberty OneSteel Whyalla WELDING SPECIFICATION SP4/01 The Company: Refers to GFG Alliance (SIMEC Mining and Liberty OneSteel Whyalla) The Contractor: Refers to all Fabricators, Suppliers and Erectors. Welding Officer Welding Technical Officer, Central Engineering, or other officer nominated by the Company for the purpose. Specification Scope This specification covers all welding and fabricating work including hard surfacing. PART I - General Conditions regarding all Welding Work. PART II - Structural Work. PART III - Boilers, Pressure Equipment and Pressure Pipe work. PART IV - Welding of Oxygen, Nitrogen and Argon Pipe work. PART V - Welding of pipe work conveying flammable gas e.g. (Town Gas, Natural Gas, Liquefied Petroleum Gas in the vapor phase, Tempered Liquefied Petroleum Gas, Simulated Gas, Natural Gas, Blast Furnace Gas, Coke Ovens Gas or any similar substance). PART VI - Brazed and Soldered Connections for Pressure Pipe work. PART VII - Welding Requirements - General Guidelines Summary. General fabrication items such as spares which may not be covered by AS1554 or AS/NZS 1554 Parts 1 to 6 are to meet the permissible levels of weld imperfections as determined by Table 6.2 of AS/NZS SP unless otherwise noted. WI37.MTS/104/1 9/08/2012 Page: 2 of 177

5 PART I - GENERAL CONDITIONS REGARDING ALL WELDING WORK 1. Conformity to Drawings and Specifications All work must be carried out in strict accordance with any drawings or specifications issued by the Company. All work shall comply with the latest editions, revisions and supplements of all relevant specifications, standards, codes and regulations whether or not referenced in this specification If any alterations are found necessary in either design or welding data specified on the drawing or this specification, the Company must approve such alterations or amendments in writing. It is the Contractor's responsibility to ensure that this written agreement is obtained. 2. Substandard Work Work carried out by the Contractor that does not meet the required specifications and / or standards, will be repaired by the Contractor at the Contractor's cost. The Welding Officer s decision on this matter will be final. In addition to all other Company requirements, welding shall be free of slag and weld spatter, whether a protective coating is applied or not 3. Inspection 3.1 The Contractor must carry out and bear the full cost of inspections nominated by a Standard or by the Company at Tender stage. Substandard work must be repaired and re-inspected at the Contractor's cost. 3.2 The Company reserves the right to carry out any type of inspection in addition to the above. This includes visual, NDT, destructive and any other form of inspection. The cost of inspections in addition to those required above (4.1) will be borne by the Company if the work is found to be satisfactory. If a weld is found to be substandard, the cost of all repairs and further inspections required by the nominated standard will be borne by the Contractor. The decision of the Welding Officer regarding acceptance or rejection of a weldment will be final. 3.3 Company representatives must at all times be given right of access for inspection purposes. The cost of providing this access at the work site will be completely borne by the Contractor, unless otherwise agreed to by the Company. This includes the cost of all scaffolding, or other access systems to enable the Company's Inspectors to carry out the necessary inspections. 4. Welding Procedures It is a condition of any contract that the Contractor be responsible for using a technically sound and proven welding procedure. The Company may provide such a welding procedure but it remains the Contractor's responsibility to ensure that they can successfully perform the process defined in the Company s welding procedure. No discussion will be entered into regarding the correctness of welding procedures issued by the company. If the Contractor uses his / her own welding procedure or a modified Company welding procedure, written approval must be obtained from a Welding Officer before such a procedure is used. WI37.MTS/104/1 9/08/2012 Page: 3 of 177

6 5. Boilers, Pressure Equipment, Pressure Pipework and Cryogenic Pipework All pipework carrying Oxygen, Nitrogen, Argon, Natural Gas, LP Gas, Blast Furnace, Coke Oven or any flammable or corrosive liquid or gas is to be fabricated in accordance with Parts III, IV, V or Part VI of this specification. 5.1 Application of Part III - Boilers, Pressure Equipment, Pressure Pipework and Cryogenic Pipework. Pressure pipework, cryogenic pipework, boilers and pressure equipment will be fabricated in accordance with Part III of this specification. All Natural Gas, and LP Gas pipelines are to be fabricated in accordance with Part V of this specification. Pipelines carrying flammable or corrosive liquids or gases are to be fabricated in accordance with Part III of this specification. 5.2 Application of Part IV - Oxygen, Nitrogen and Argon Pipework. All oxygen, nitrogen and argon pipework is to be fabricated in accordance with Part IV of this specification. 5.3 Application of Part V - Natural Gas, Liquefied Petroleum Gas Pipework, Blast Furnace and Coke Ovens Gas. All natural gas, liquefied petroleum gas blast furnace and coke ovens gas pipework is to be fabricated in accordance with Part V of this specification. 6. Hydraulic Pipework 6.1 All pipework for hydraulic systems will be welded in accordance with Part III of this specification. All pipework shall meet the requirements of OneSteel s Hydraulic Specifications FP In addition to Part III the following requirements are to be met: All butt welds are to have a (GTAW) root run The Manual Metal Arc Welding (MMAW) process is allowable only on hydraulic pipe work greater than 50mm NB unless otherwise agreed to between the Company and the Contractor On smaller pipe work 50mm NB the Gas Tungsten Arc Welding process (GTAW) must be used Whilst any tack welding or welding using the G.T.A.W. process is in progress all pipework shall be internally purged using welding grade argon Oxy fuel gas welding or brazing is not permitted on hydraulic pipework Socket weld connections may only be used on hydraulic pipework after the Contractor obtains written approval from the Company s Hydraulic and Lubrication Department. All socket welds to be in accordance with AS4041. WI37.MTS/104/1 9/08/2012 Page: 4 of 177

7 7. Supervision In all cases the Contractor will ensure adequate supervision and safety during welding and fabrication is maintained. 8. Welding Consumables 8.1 Ferrous Consumables Welding consumables shall be in accordance with the following current Standards AS/NZS 1167 AS/NZS 1858 AS/NZS 2203 AS/NZS1553 AS/NZS 2576 AS/NZS Unless otherwise agreed to, all consumables used shall meet hydrogen-controlled requirements of 5-10ml per 100g of deposited weld metal. Where not covered by Manufacturers instructions hydrogen-controlled electrodes shall be stored and used under the following conditions: o o o Electrodes shall be stored in their unopened packets or cartons in a reasonably dry place adequately protected from the effects of weather. Electrodes which have been wet or which have had the flux covering damaged shall not be used whether dried or not. Electrodes shall be drawn from heated ovens and put in hot boxes set at C for direct use Cellulose welding electrodes E4111 can only be used for root runs to an approved qualified welding procedure specification All low carbon and carbon manganese steel consumables must meet grade 2 impact requirements or better. Unless not required by an Australian Standard or classification Submerged arc flux, gas metal arc and flux-cored wire shall be clearly identified and shall be stored in a dry location at a temperature above 20 0 C. The identification shall state manufacturer, grade and batch number All welding consumables, which cannot be identified, shall be discarded. WI37.MTS/104/1 9/08/2012 Page: 5 of 177

8 9. Pipelines under Roadways All pipelines under roadways will be subject to 100% radiography continuing a distance of 2 metres on either side of the roadway. 10 Plumbing All pipework servicing showers, toilet amenities, wash basins, commercial buildings, offices and supply to evaporative cooling units is deemed to be plumbing and shall comply with Australian Standard AS 3500-National Plumbing and Drainage Code. Connection to a water supply main and the connecting pipework to the first isolation valve shall comply with the requirements of Australian Standard AS 4041-Pressure Piping and Part III of this document. At the point of connection between the supply main and plumbing service pipework, an isolation valve shall be fitted. All piping for fire service applications, shall comply with Australian Standard AS 4041 and Part III of this document. 11 Welding Process The Gas Metal Arc Welding (G.M.A.W.) process is prohibited, written authority shall be required before this welding process can be used. 12 Flanged joints Faces of adjoining flanges shall align within one degree of the design plane when measured across any diameter. Each adjoining bolt hole shall align within 3mm. The surfaces to be clamped shall be clean and undamaged (flange faces in contact areas are not to be painted). 13 Weld maps Marked up drawings detailing all welded joints locations, welder identification and Non Destructive Testing locations shall be supplied for all Class 1 and 2 pipe work. Structural fabrication for Cranes and Lifting equipment shall have weld maps. WI37.MTS/104/1 9/08/2012 Page: 6 of 177

9 PART II - STRUCTURAL WORK 1. Applicable Standards All material and workmanship supplied by the Contractor shall conform to the latest amendments of the following Standards. The Contractor must also conform to the reference Standards cited in these Standards. AS/NZS Welding of Steel Structures AS Arc Stud Welding (Steel Studs to Steel) AS Welding of Reinforcing Steel AS/NZS Welding of High Strength Quench and Tempered Steels AS/NZS Welding of Steel Structures Subject to High Levels of Fatigue Loading. AS/NZS Welding of Stainless Steel for Structural Purposes AS2980 Qualification of arc-welders for welding of steel AS 1665 Aluminum Welding Code AS 1566 Copper and Copper Alloys - Rolled Flat Products AS 1567 Copper and Copper Alloys - Wrought Rods, Bard and Section AS 1674 Safety in Welding and Allied Processes Part 1 - Fire Precautions Part 2 - Electrical AS 1796 Welder Certification Code AS 1988 Welding of Steel Castings AS 2576 Welding Consumables for Build-up and Wear Resistance AS 4100 Structural Steel Code WI37.MTS/104/1 9/08/2012 Page: 7 of 177

10 2. Welding Procedure Qualification 2.1 No weldment will be accepted unless it is produced to a qualified or prequalified welding procedure as defined by the relevant Standard. 2.2 If an applicable standard for qualifying a weld procedure is not available, the welding procedure must be qualified to the satisfaction of the Company's Welding Officer. It is the Contractor's responsibility to ensure that authorisation to use the procedure is obtained in writing from the Welding Officer. 3. Qualifications of Welding Personnel 3.1 Welding and welding operators shall be qualified in accordance with the relevant Codes and Standards. Welders who cannot produce certificates issued by an acceptable Examining Authority, or AS1554, AS/NZS 1554 and AS2980 may be prohibited from performing welding work for or on OneSteel site. 3.2 In all cases the Contractor is to maintain a list of the personnel being used and their qualifications. This list is to be provided to the Company on request. 4. Quality Assurance Records Generally the Contractor shall not be required to supply copies of quality assurance records to the Company for work covered by this Part II. However, the Company reserves the right to inspect such records and request copies should it be considered necessary. Such copies shall be provided at no additional cost to the Company. 5. Use of SP and FP Grade to AS/NZS 1554 and AS Unless otherwise agreed in writing between the Contractor and the Company, all welding shall at least meet the requirements of AS1554 and AS/NSZ 1554 part 1 Weld category SP. Welding to AS/NZS1554 part 6 shall meet the requirements of Internal weld quality Level 1 External weld quality Class B and a surface finish of Grade II unless noted otherwise. 5.2 Any welds of Category 125 as defined by AS 4100 shall comply with AS/NZS Weld category FP. 5.3 The suggested levels of NDT specified in the respective parts of AS/NZS 1554 and AS 1554 shall be the minimum performed in all cases unless the Contractor obtains a written variation agreement from the Company. 6. NDT Levels for Cranes and Lifting Equipment 6.1 All welds shall be subject to 100% magnetic particle examination. 6.2 Built up I girders and box girders All girder tension flange butt welds shall be subjected to 100% radiographic examination The lower 30% of all girder web butt welds shall be subjected to 100% radiographic examination All web to flange girder welds shall be subjected to 100% ultrasonic examination. WI37.MTS/104/1 9/08/2012 Page: 8 of 177

11 PART III - BOILERS, PRESSURE EQUIPMENT AND PRESSURE PIPEWORK 1. Application This specification applies to pressure vessels, pressure pipework and pressure components manufactured to comply with the AS/NZS Any repair, alteration or maintenance work carried out on boilers, pressure equipment or pressure pipework is to be done in accordance with this part. An Inspection and Test Plan (I.T.P) if required is to be made available to the company before any fabrication repair or alteration is commenced under Part lll of this specification. The Contractor shall verify the completion of the respective manufacturing / inspection activities by signing the ITP, as appropriate. 2. Applicable Standards 2.1 All materials and workmanship supplied by the Contractor shall conform to the latest amendments of the following Standards. The Contractor is also required to conform to other relevant standards referenced in these documents. 2.2 All Standards listed in Part II, Section 1 of this specification apply to this part. The following Standards also apply: AS/NZS1200 Boilers and Pressure Vessels. AS 1210 Unfired Pressure Vessels. AS 1228 Water Tube Boilers. AS 1432 Copper Tubes for Water, Gas and Sanitation. AS 1572 Seamless Copper and Copper Alloy Tubes. AS 1579 Arc Welded Steel Pipes for Water and Gas. AS 1596 LP Gas Code - Storage and Handling. AS 1697 Gas Pipeline Code. AS 1797 Fire Tube Shell and Miscellaneous Boilers. AS 2129 Flanges for Pipes, Valves and Fittings. AS 2885 Gas and Liquid Petroleum Pipeline Code. AS 3788 Boilers and Pressure Vessels- In-service Inspection. AS Assurance of Product Quality Part 1-Pressure Equipment Manufacture. AS 3992 Boilers and Pressure Vessels Welding & Brazing Qualification. AS 4037 Boilers and Pressure Vessels - Examination and Testing. AS 4041 Pressure Piping. ASME IX Boilers and Pressure Vessels Code. ANSI B31.1 Power Piping. ANSI B31.3 Chemical Plant and Petroleum Refinery Piping. AS 5601 Gas Installation Code. AS4458 Pressure Equipment Manufacture. AS3814 Code for Industrial and Commercial Gas-fired Appliances. 2.3 The use of socket welded connections should be avoided, but where used shall comply with the requirements of AS Material Certification 3.1 Material Test certificates shall be obtained by the Contractor before manufacture of the component commences. 3.2 Material certificates shall be permanently identified with the applicable item number and detailed on relevant drawings. WI37.MTS/104/1 9/08/2012 Page: 9 of 177

12 3.3 All material certification shall be incorporated into the manufacturer's data report, and forwarded to the Company's Welding Officer on completion of the project. 4. Welders and Supervisor Certification 4.1 Before Manufacture Welders shall be suitable qualified as per AS3992 before commencing any welding. Evidence of this is to be supplied to the Company's Welding Officer prior to commencement of work, unless otherwise specified. Welders who cannot produce welder qualification documentation as per AS3992 will not be allowed to perform welding work Welding Procedure Specifications shall be suitable qualified as required by AS3992 or other relevant Standards. The Contractor shall, before commencing fabrication, submit to the Welding Officer, qualified welding procedures and welding specification records for all welds. Once accepted the welding procedures shall be adhered to. 4.2 During and After Manufacture Progressive inspections and testing shall be carried out by the Contractor and if required witnessed by the Welding Officer or nominated person throughout the duration of the work, in accordance with the approved ITP, as a minimum. Each joint welded shall be suitably identified and documented to permit identification of the work of that welder. These records are to form a part of the Manufacturer's Data Report, (MDR) and shall be forwarded to the Company's Welding Officer on completion of the project. 4.3 Adherence to Welding Procedure The Contractor is responsible for ensuring that all aspects of the Welding Procedure are strictly adhered to. Any diversions from the Welding Procedure may lead to a joint being condemned if departure is not approved in writing. 4.4 Work Performed on OneSteel Site Where the specification requires non-destructive testing, i.e. radiography, ultrasonic or magnetic particle inspection to be performed by the Contractor on site, the results must be submitted to the Welding Officer Radiographs must be check viewed by qualified NDT personnel, and satisfy the requirements of the relevant standard prior to being stored for documentation purposes. 4.5 Underground Pipework Unless otherwise agreed to in writing between the Contractor and the Company, all underground pipework encased in concrete that carries lethal, hazardous or harmful contents must be radiographed to meet code requirements. If any joint fails radiography, the Company reserves the right to require 100% radiography. WI37.MTS/104/1 9/08/2012 Page: 10 of 177

13 5. Heat Treatment 5.1 Heat Treatment shall be applied as required by the relevant standard. Documentary evidence of heat treatment is to be included in the MDR 6. Welding Procedures 6.1 Qualified welding procedures, which have successfully passed the inspections and testing (detailed in Part III, Section 4.1.2), to the relevant standard, shall be submitted to the Company's Welding Officer for approval prior to the commencement of work unless otherwise specified. 7. Statutory Approvals 7.1 Where applicable the Contractor is responsible for obtaining a design registration number and design approval from a Design Verifying Body. 7.2 Components delivered to the Company, in part, or complete fabrication, shall where appropriate, be permanently stamped with the design approval number. 7.3 A copy of all letters of approval from the relevant Design Verifying Body are required to be in the Company's possession before construction work commences. 8. Manufacturer's Data Reports 8.1 In all cases the Company must receive a completed and approved MDR. WI37.MTS/104/1 9/08/2012 Page: 11 of 177

14 PART IV - WELDING OF OXYGEN, NITROGEN, AND ARGON PIPELINES 1. Application This specification applies to all pipework carrying oxygen, nitrogen and argon and it is not designed to limit or restrict any requirement the Company's Power and Services Manager requires in addition to this specification. The Company will supply such additional requirements in writing to the Contractor. An Inspection and Test Plan (I.T.P) if required is to be made available to the company before any fabrication repair or alteration is commenced under Part III of this specification. The Contractor shall verify the completion of the respective manufacturing / inspection activities by signing the ITP, as appropriate. 2. Applicable Standards and Specifications All work performed and materials supplied by the Contractor are to conform to the latest amendments of the following Standards. 2.1 Ferritic Steels AS 4041 ASME IX Pressure Piping Boilers and Pressure Vessels 2.2 Austenitic Steels BS 4677 ASME IX AS 4041 Class I Welding of Austenitic Stainless Steel Pipework Boilers and Pressure Vessels Pressure Pipework 2.3 Non - Ferrous Materials ASME IX AS 4041 Boilers and Pressure Vessels Pressure Piping 3. Welding Requirements 3.1 Design Approval The pipework must satisfy the requirements of AS4041 and OneSteel Specification GJ (Standard for the Transportation and Distribution of Oxygen by Pipeline). 3.2 Welders Certificates and Competency Welders shall be suitable qualified as per AS3992 before commencing any welding. Welders who cannot produce qualification documentation as per AS3992 will not be allowed to perform welding work. Welders may need to demonstrate competency at the discretion of the Company's Welding Officer. 3.3 Material Certificates All materials used must have material certificates. WI37.MTS/104/1 9/08/2012 Page: 12 of 177

15 3.4 Qualified Welding Procedure 3.5 NDE All Welding Procedures must be qualified in accordance with the relevant Standard. Non Destructive Examination must be carried out in accordance with the relevant Standard and any additional requirements of this specification. 3.6 Pressure Testing and Leak Testing All pressure testing and leak testing will be in accordance with the requirements of OneSteel Specification GJ (Standard for the Transportation and Distribution of Oxygen by Pipeline). Documentation of successful pressure test is required. 3.7 Documentation Documentation covering sub-section 3.1 to 3.6 inclusive of this part shall be required. 4. Radiography 4.1 Standard of Acceptance for radiography (All Materials) The standard of acceptance for radiography is AS In addition to the requirements of AS 4041 the maximum excess root penetration and maximum internal protrusion limit due to misalignment or mismatched bore sizes is 1mm in total and no lack of penetration is allowable on Oxygen pipework. 4.2 Levels of Radiography Above Ground Pipelines Non Destructive Examination requirements and weld acceptance levels shall be as per AS4037 for the nominated Design Class of piping unless noted otherwise Underground Pipelines 100% radiographic examination shall be conducted at welded joints on all underground pipework and pipework to be embedded in concrete. 5. Socket Weld Connections Socket welded connections generally are not permitted on oxygen, nitrogen and argon pipelines. The Contractor must seek written approval from the Company if socket welded connections are intended to be used. Generally, consideration will only be given to the use of these connections on pipelines of 10 NB or less. 6. Soldering and Brazing The Contractor must receive written approval to solder and braze joints from the Company. Brazing and soldering must be performed in accordance with Part VI of this specification. Generally, welding will be the only acceptable method of joining oxygen, nitrogen and argon pipelines and consideration will only be given to allow soldering or brazing of small (20 NB or less) copper pipework. WI37.MTS/104/1 9/08/2012 Page: 13 of 177

16 PART V - Pipework For Flammable Gas. 1. Application Welding of pipework conveying Town Gas, Natural Gas, Liquefied Petroleum Gas in the vapour phase, Tempered Liquefied Petroleum Gas, Blast Furnace Gas, Coke Ovens Gas, Simulated Gas, Natural Gas or any similar substance. An Inspection and Test Plan (I.T.P) if required is to be made available to the company before any fabrication repair or alteration is commenced under Part lll of this specification. The Contractor shall verify the completion of the respective manufacturing / inspection activities by signing the ITP, as appropriate. 2. Welding Requirements 2.1 Design Approval The pipework must satisfy the requirements of AS4041 Class 2A piping or AS Welders Certificates and Competency Welders shall be suitable qualified as per AS3992 before commencing any welding. Evidence of this is to be supplied to the Company's Welding Officer prior to commencement of work, unless otherwise specified. Welders who cannot produce qualification documentation as per AS3992 will not be allowed to perform welding work. 2.3 Material Certificates All materials must have material certificates 2.4 Welding Procedures 2.5 NDE Welding Procedure Specification records shall be suitable qualified as required by AS3992 or other relevant Standards. The Contractor shall, before commencing fabrication, submit to the Welding Officer qualified welding procedures for all welds. Once accepted the welding procedures shall be adhered to. All welding procedures must be in accordance with the relevant Standard. Non Destructive Examination must be carried out in accordance with the relevant Standard and any additional requirements of this specification. 2.6 Pressure Testing and Leak Testing All pressure testing and leak testing will be in accordance with the requirements of AS 5601 Gas Installation Code. Piping which is to be installed in an inaccessible location should be tested prior to the piping being made inaccessible. 2.7 Documentation Documentation covering sub-section 2.1 to 2.6 inclusive of this part shall be required. 2.8 Flange Joints Not to be used for joining pipe lengths unless butt-welding is impracticable. WI37.MTS/104/1 9/08/2012 Page: 14 of 177

17 3 Radiography 3.1 Standard of Acceptance for radiography (All Materials) The standard of acceptance for radiography is AS 4037 Class 2A piping unless otherwise noted. 3.2 Levels of Non Destructive Examination Above Ground Pipelines Non Destructive Examination requirements and weld acceptance levels shall be as per AS4037 for the nominated Design Class of piping unless noted otherwise Underground Pipelines 100% radiographic examination shall be conducted at welded joints on all underground pipework and pipework to be embedded in concrete. 4. Socket Weld Connections Socket welded connections generally are not permitted on oxygen, flammable gas pipelines. Sockets are to comply to ANSI/ASME B16.9 or with BS3799. Welding to comply with AS4041 Class 2A unless otherwise noted. 5. Soldering and Brazing The Contractor must receive written approval to solder and braze joints from the Company. Brazing and soldering must be performed in accordance with Part VI of this specification. Generally, welding will be the only acceptable method of welding Oxygen, Nitrogen and Argon pipelines. Consideration will only be given to allow soldering or brazing of small (20 NB or less) copper pipework. WI37.MTS/104/1 9/08/2012 Page: 15 of 177

18 PART VI - BRAZED AND SOLDERED CONNECTIONS FOR PRESSURE PIPEWORK (All pipework other than domestic water pipework) 1. Approval The Contractor must obtain written approval from the Company to use a brazed or soldered joint on pressure pipework. 2. Qualification of Personnel Personnel engaged in the brazing or soldering of pressure pipework are required to demonstrate competency. A certificate to AS 1796 is not required. 2.1 Competency Tests - Standard of Acceptance Competency tests are to be conducted in accordance with ASME IX ARTICLE XI or AS/NZS 3992 Section Brazing or Soldering Procedure The Company must approve the Brazing or Soldering Procedure for use in writing. The procedure must comply with ASME IX ARTICLE XI or AS/NZS 3992 Section 12. WI37.MTS/104/1 9/08/2012 Page: 16 of 177

19 PART VII - WELDING REQUIREMENTS - GENERAL GUIDELINES SUMMARY Criteria to be Considered for the Following Work Manufacturing Steps General Cranes Pressure Piping Boilers and Pressure Class 1&2 Class 3 Vessels 1. Obtain Design Approval from a Design Verification Body. NO YES YES NO Compulsory Hazard Level 2. Design Registration NO YES NO NO Compulsory Number Required 3. Ensure that Welders are Qualified. Compulsory Compulsory Compulsory 4. Compulsory Compulsory Ensure that all Welding Refer to Refer to AS/NZS 3992 Procedures are Qualified AS/NZS 1554) Parts 1 to 6 5. Ensure that material has Certificates - Chemistry, YS, UTS and Elongation A:B. NO YES YES Compulsory 6. Ensure that Welders are competent Compulsory Compulsory Compulsory 7. Heat Treatment YES YES YES 8. NDT YES Compulsory YES Compulsory 9. Hydrostatic Test NO YES Compulsory 10. Give approved MDR or Q/A Record to Welding Officer YES Compulsory Compulsory KEY: NO: YES: Compulsory: This criteria does not have to be considered. This criteria must be taken into consideration, however a code or specification may exempt this request These criteria must be acted on and carried out. WI37.MTS/104/1 9/08/2012 Page: 17 of 177