Ụkpụrụ Kere & rụpụta: API 609, ASME B16.34 Nnwale nnwale: API 598 Akụkụ ihu na ihu: ANSI 609 Akụkụ njedebe flanged: ASME B16.5, ASME B16.47A, ASME B16.47B, MSS SP-44, API 605 Akụkụ njedebe nke butt-welded: ASME B16.25