Welding Fabrication Standards - EWF

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Welding Fabrication Standards Page 64 a cylindrical part of circular cross section is closed by outwardly dished and/or flat ends which revolve around the same axis as the cylindrical part; − two outwardly dished ends revolving around the same axis; Moreover, the field of application of the standard considers the following technical conditions are met: − the vessel is subjected to an internal gauge pressure greater than 0,5 bar; − the parts and assemblies contributing to the strength of the vessel under pressure are made either of non-alloy quality steel or of non-alloy aluminium or non-age hardening aluminium alloys; − the maximum working pressure is 30 bar and the product of that pressure and the capacity of the vessel (PS x V) is greater than 50 bar litres and not exceeding 10 000 bar litres; − the minimum working temperature -50° C and maximum working temperature not higher than 300°C for steel and 100°C for aluminium or aluminium alloy vessels. It does not apply to vessels specifically designed for nuclear use, to vessels specifically intended for installation for the propulsion of ships and aircraft, or to fire extinguishers. Aspects of Quality Assurance are dealt with in various clauses and annexes of this Standard, even if there is no specific requirements as relates to the application of quality management standards. Therefore the fulfilment of EN ISO 3834 10 can only be suggested, and is not compulsory. As concerns specific requirements for welding activities, the following apply: − there shall be no welding carried out on the pressurised parts of a vessel once the hydraulic test has been successfully completed; however reinforcing plates for supports and brackets are not considered to be pressurised parts; − if a manual root on the reverse side is made prior to a second run made by an automatic process then the root weld shall be taken back to the sound metal to remove any inclusion i.e. slag, etc.; − welding procedures shall be qualified by welding procedure test or previous satisfactory experience; − the testing and qualification of welding procedures, welders and welding operators shall be carried out by an approved inspection body. The standards also reports specific testing criteria and relevant acceptance depending on the type of joint, stresses and materials considered in the design phase. 10 The EN ISO 3834 part 3 or part 4 seem to be enough significant to guarantee proper management of welding operations. Istituto Italiano della Saldatura Lungobisagno Istria, 15 - 16141 Genova (I) - Tel. 01083411 - Fax 0108367780
Welding Fabrication Standards Page 65 As relates to the equipment, it is required to the Manufacturer to calibrate the testing equipment and to maintain the relevant record. 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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