BS/EN 16668-2016 pdf download.Industrial valves Requirements and testing for metallic valves as pressure accessories.
c) the welders and welding operators are qualified for the work allocated to them and their approval isvahd.
Welding of high-alloy martensitic chromium steels (>13 % Cr) requires particular qualification, except casting production welds at the foundry.
NOTE The provision of the fabrication drawings with welding data (weld details, welding procedure and welding fillers) including information on type and extent of non-destructive testing of welding seams, parts lists and copies of the welding procedure qualifications may be subject to agreement between manufacturer and Purchaser.
5.3.1.2 Welding procedure specification (WPS)
The manufacturer shall compile welding procedure specifications, in accordance with EN ISO 15609-1:2004 forall welds.
5.3.1.3 Qualification of welding procedure specifications (WPQR)
Welding procedure specifications to be used shall be qualified by reference to an appropriate WPQR.
For the pressure retaining welds of a shell this shall be achieved by performing welding procedure qualification tests in accordance with EN ISO 15614-1:2004, EN ISO 15614-2:2005, EN ISO 15614-5:2004, EN ISO 15614-6:2006 or by preproduction tests in accordance with EN ISO 15613:2004.
For additional requirements to be considered in course of the qualification of welding procedure qualification see EN 13445-4:20 14. It is regarded as the obligation of the valve manufacturer to meet the supplementary requirements as applicable.
5.3.1.4 Approval of welders and welding operators
Welders and welding operators shall be qualified according to the applicable part of the EN ISO 9606- series, whereas qualification testing of welders for the fusion welding of steeLs shall be qualified according to EN 287-1:2011 until EN ISO 9606-1:2013 is published in the Official Journal (OJEU). Qualification of welding operators shall be in accordance with EN ISO 14732:2013.
In the course of the qualification welding of personnel, the additional requirements of EN 13445-4:2014 apply. It is regarded as the obligation of the valve manufacturer to meet the supplementary requirements as applicable.
5.3.1.5 Finishing welding on castings
Finishing welding Is only permissible on steel castings.
When carrying out finishing welding on steel castings, the defective area shall be completely rectified; it shall be tested for freedom from inadmissible imperfections.
Finishing welding shall be performed in accordance with a written procedure specifying the requirements for defect removal, welding, heat treatment and non-destructive testing.
Undocumented finishing welding prior to PWHT is permissible provided the defect depth does not exceed 40 % of the wall thickness.
Undocumented finishing welding after PWHT is permissible, provided that the defect depth does not exceed 20 % of the wall thickness or 25 mm, whichever is the smallest value.
Depressions resulting from the removal of imperfections shall be 100 % surface tested in order to ensure the complete removal of the defect. For the surface testing, magnetic particle testing (MT) or penetrant testing (PT) shall be applied as appropriate.
5.3.1.6 RepaIr of joint weld defects
For requirements for repair of joint weld defects see EN 13445-4:2014, 11.2.
Repair work on the welds and NDE results to be documented and made available to the purchaser on request.
All unacceptable imperfections shall be removed, either by mechanical means (such as grinding or machining) or by thermal means (such as arc air gouging or thermal gouging) or by a combination of thermal and mechanical means. It is the responsibility of the manufacturer to decide how unacceptable imperfections shall be removed. This may be by local means or by removal of the weld from the joint followed by rewelding.
When thermal gouging/arc air gouging is used on austenitic steels, care shall be taken to remove any contamination of the remaining weld or material. Similarly when gouging with carbon electrodes is used on ferritic steels, the affected surface shall be removed by mechanical means to a minimum depth of 0,3 mm.
Thermal gouging methods may not be used for martensitic creep-resisting steel.
When unacceptable imperfections are removed and are not followed by welding, all the remaining thickness shall be greater than the minimum thickness necessary to satisfy the design unless the local area satisfies the conditions of 5.3.2. The area shall have a taper with the adjoining surfaces, and blend smoothly.
Repairs by welding shall be carried out in accordance with a WPS which has been qualified in accordance with 5.3.1.4.
This may be the same WPS as the one used for making the joint originally or a specific qualified repair procedure.
Repairs shall be carried out by qualified welders or operators in accordance with 5.3.2. Weld repaired areas shall be non-destructively examined in accordance with EN 13445-5:2014.BS/EN 16668-2016 pdf download.
BS/EN 16668-2016 pdf download
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