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For which materials is Standard Welding Procedure Specification (SWPS) EN ISO 15612 for pressure vessels possible?

EN ISO 15612 specifies how a standard welding procedure specification (SWPS) can be qualified by developing it on the basis of one or more Welding Procedure Qualification Records (WPQR) qualified according to EN ISO 15614-1 level 2 or EN ISO 15614-2.

Which EN ISO 15608 Material Groups?

EN ISO 15612 application is limited to parent EN ISO/TR 15608 material groups 1.1, 1.2, 1.3, 8.1 and 11.1 (Steel material thicknesses t ≤ 50 mm) and also EN ISO/TR 15608 material groups 21, 22.1 and 22.2 (Aluminium and Aluminium alloys).

Joints between dissimilar material groups are not permitted, except for

  • any combination between Material Group 1.1, 1.2 and 1.3 and Material Group 11.1;
  • combinations between combinations between Material Group 22.1 and Material Group 22.2.

The SWPS shall specify the ranges for all the relevant variables in accordance with the relevant part of EN ISO 15609.

Is this SWPS accepted for pressure vessels design code EN 13445?

EN 13445-4 (steel) and EN 13445-8 (aluminium) accepted this SWPS only for welds made directly on pressure vessels, that are not pressure-bearing, such as support rings, supports, saddles. WPQR approval is required (see below).

In accordance with EN 13445-4 (steel) and EN 13445-8 (aluminum), a welding procedure qualification test (WPQR) in accordance with EN ISO 15614-1 or EN 15614-2 is required for pressure vessels. This must be approved for category II, III and IV pressure equipment by a notified body or a recognised organisation third-party testing body.

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Which materials are meant in the above-mentioned material groups? You can find a list!

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