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PED is intended to cover equipments or installations to be sold. If you fabricate something on your own and you are not selling it I believe this applies to you. European Directives are focused to godos to be sold whithin the European Union.

Threaded fittings are also covered by EN 10241. Best,

Hi, I believe reducing couplings are covered by EN 10253 std. Anyway I do think that type13 flanges are G threaded and not NPT threaded, check that.

If you have to fully comply with an international standard, openings in pressure parts are covered in chapter 7 of EN 13480-3, the EN piping design code, parallel to 13445-3 that you mentioned (EN pressure vessel design code). Best,

Those are the material specs, both are carbon Steel: 105 is forged Steel and 216 is casting Steel. It does not have nothing to do with weldability of it is threaded. For a 8" valve you are probably limited to casting Steel in the general market. There are advantages and disadvantages, but must...

Do you have to comply with a client spec, CE marking or anything like that in your piping system? If not, I think it is ok to think that if you drill a smaller hole than the equivalent type13 flange, you should be fine. I have used type 13 flanges adding a reducer coupling to match my...

Check Genebre webpage. I hope is for low service.