Welding Fabrication Standards - EWF

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Welding Fabrication Standards Page 56 As relates to welding materials, in addition to what is required in part 2 of the standard, the Manufacturer is requested to have filler metals and auxiliary materials with documentation according to EN 10204, test report 2.2. For identification and traceability reasons, all the welds shall be directly correlated to the welder that performed the joint, by the welder’s symbol close to the weld itself or by corresponding details in the fabrication documents. 5.4.2 Requirements for the welding activities Welders and welding operator shall be qualified according to the relevant standard (EN 287-1 and EN 1418) for the intended processes, material groups and range of sizes, and shall be in possession of a valid test certificate. Welding procedures specification shall be prepared in accordance to the relevant European standard - e.g. EN 15609 (EN 288-2) -, also reporting information on the Non Destructive Testing to be applied to the joint. Specifications shall be properly qualified by an appropriate method, depending on the “piping class” (defined on the base of diameter, pressure and type of fluid). In the case of the higher classes (class II and III) only qualification by welding procedure test or welding pre-production test are accepted, having as examining body a third party. Less stringent requirements are given for less critical classes. During electric arc welding, piping shall be earthed so that no welding currents flow through spring hangers, constant load hangers, snubbers, machines, valves, mechanical connections etc. This has to be accomplished in order to avoid both welding defects (e.g. due to arc blow) and to avoid damage or degradation in the mechanics of these components (e.g. ball bearings) due to high welding currents. Welding defects, which require repair shall be removed by grinding, chipping, gouging, flame, plasma or machining part or all of the weld. When using thermal processes, the pipe and weld material shall not be adversely affected. Prior to repair welding, the surface of all joints shall be examined by NDT to ensure they are free from cracks and other defects. Weld repairs shall be made using approved procedures and approved welding personal; A weld defect shall not be repaired more than twice with the same procedure. Any further repair shall be done in accordance with an approved, modified and documented procedure. All weld repairs shall be documented, by reporting the test reports that lead to the repair, (e.g. by attaching the films showing the defects, if available), and the repair procedures and the report for the newly carried on tests. Istituto Italiano della Saldatura Lungobisagno Istria, 15 - 16141 Genova (I) - Tel. 01083411 - Fax 0108367780
Welding Fabrication Standards Page 57 5.5 EN 13480-5: Inspection Figure 16 – Welding of a 10 inches industrial piping This Part of the Standard specifies the requirements for inspection and testing of industrial piping to be performed on individual spools or piping systems, including supports, designed in accordance with part 3 and 6 (if applicable), and fabricated and installed in accordance with EN 13480-4. Type, extension and acceptance criteria for the testing are reported, depending on the piping class. The following inspection phases are identified: − design validation; − in-process inspection and testing (including welding process indirect control, as relates to welders, to welding procedures and to inspection during welding); − non destructive testing of welds; − final assessment; − documentation to be maintained and delivered with the product. Table 13 reports the general requirements for the non destructive testing of welds, and the relevant acceptance criteria. 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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