NACE 0175 – PREQUALIFIED MATERIALS

1,In Nace MR 0175 there are Prequalified Materials such as A333, A106 etc., there materials doesnt require any SSC,HIC test.

My query is...

In what basis these materials are qualified?

2,In Process H2S line it is not advised to use Socketweld and threaded ends.

My query is...

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