Ko te paerewa paipa ERW e whai ake nei: API 5L, ASTM A53 B, ASTM A178, ASTM A500/501, ASTM A691, ASTM A252, ASTM A672 API 5L Paerewa e whai ana ki te hau me te wai i roto i te ahumahi hinu me te hau mo te tohutoro, e whakamahia ana mo te paipa maitai tuitui me te paipa maitai paiherea, tae atu ki te tauranga noa me te tauranga, te tauranga putorino...
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