Mixing EN and ASTM/ASME standards in valves

[Garlik]

Hello.

Is it acceptable if I have a valve designed according to EN 12516-2 and the pressure boundary parts are made of ASTM/ASME materials? If I have welds among these pressure boundary parts, the Welding plans and procedures should be according to EN or ASTM/ASME standards? The NDTs of these welds should also be according to EN or ASTM/ASME?

As a summary, the question would be: If there is the presence of 2 different standards (EN for the design code of the valve and ASTM (or ASME) for the pressure boundary parts), which one is the most important? Or which one should rule over the other?

Can someone (try to) answer these questions, please? Your help is highly appreciated.

Thank you very much.

 

[XL83NL]

First, what does your jurisdiction dictate you? Given your mention of EN, is this for piping/pressure equipment work within the EU (i.e. PED 97/23/EC applies)?
Second, what does your contract/engineering design require you to do? Do you need to follow a design Code? If B31.3 is required, Im not sure but you may have a problem given the mix up of specs/standard within 1 component. EN codes tend to be more easy on this.
Third, what does EN 12516-2 allow (you) to do?

AFAIK, within EN codes you can use ASTM materials under certain circumstances. However, Im not sure if your question should be which one rules out the other, but if what you're doing is a good thing to do, and if its allowed within your engineering design.