Welding Fabrication Standards - EWF

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Welding Fabrication Standards Page 46 − the manufacturing procedures such as welding, forming and heat treatment shall be adequate for the purpose and the pressure vessel meets the requirements of EN 13445-4; − the manufacturing equipment shall be adequate for fabrication; − the staff shall be adequate for the assigned tasks, in particular as far as welding co-ordination is concerned, the qualifications, tasks and responsibilities can be defined by the Manufacturer in accordance with ISO 14731/EN 719 in the job assignment; − the quality requirements for welding defined in ISO 3834-3:1994 shall be met as a minimum; − material traceability to the original identification markings is required through appropriate methods; − the batch numbers of welding consumables shall be recorded. 4.5.2 Requirements for subcontracting When welding, forming, heat treatment and non destructive testing work is performed by a Subcontractor, the following requirements shall be met: − the Subcontractor shall give information on its manufacturing capabilities by an appropriate subcontracting form; − the Manufacturer shall properly asses the Subcontractor, that he applies the requirements according to this part of the standard and according to the ISO 3834 – 3; − the Manufacturer shall also either obtain copies of the welding procedure and welding operator qualification records or take other action to ensure that they comply with this part of the standard. 4.5.3 Specific requirements for welding activities In addition to what reported in ISO 3834-3, welding of the component parts of a pressure vessel shall only be undertaken if the following conditions are satisfied: − a welding procedure specification for every type of joint is held by the Manufacturer; − the welding procedures selected by the Manufacturer are qualified for the field of application; − the welders and welding operators are qualified for the work allocated to them and their approval is in the validity period; − a record shall be maintained for each weld reporting the welder or welding operator that performed the joint. The type and design of the weld detail shall be considered taking into consideration: − the method of manufacture; − the service conditions (e.g. corrosion); − the ability to carry out the necessary non-destructive testing required in accordance with EN 13445-5. Istituto Italiano della Saldatura Lungobisagno Istria, 15 - 16141 Genova (I) - Tel. 01083411 - Fax 0108367780
Welding Fabrication Standards Page 47 As for the approval of welding procedures, qualification by welding procedure test and pre production test are the only applicable methods, and specific requirements for the acceptance criteria for the tests are given to integrate the ISO 15614. This is required also in the case of repair by welding. In the case of welds other than pressure retaining welds directly attached to the pressure vessels (e.g. tray rings, support feet, etc.), welding procedure specifications may be acceptable by holding welding procedure approval records by to previous experience and /or standard welding procedure for arc welding. Whenever welders not in the employ of the Manufacturer are used, they shall be under the full technical control of the Manufacturer and work to the Manufacturer's requirements. Other requirements are given for filler metals, joint preparation methods, attachment supports and stiffeners and preheat. 4.5.4 Other requirements This part of the standards reports other requirements as concerns: − materials − manufacturing tolerances; − production tests; − forming of pressure parts; − post weld heat treatment (PWHT); − repair; − finishing operations. 4.6 EN 13445 – 5: Inspection and testing This Part covers all those inspection and testing activities associated with the verification of the pressure vessel for compliance with the standard, including design review by the Manufacturer and supporting technical documentation. Numerous inspection activities, in addition to the Non Destructive Testing (NDT) are described including document control, material traceability, joint preparation and welding. The requirements for testing are predominantly related to individually designed single vessels. However, procedures are provided for serially produced pressure vessels. The level of testing is driven by the selection of the vessel testing group. Basically, the testing group determines the level of NDT and the joint coefficient used in the design. There are four testing groups, which are designed to give the same safety by a combination of several factors. Istituto Italiano della Saldatura Lungobisagno Istria, 15 - 16141 Genova (I) - Tel. 01083411 - Fax 0108367780
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Welding Fabrication Standards - EWF

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