Design standards: API 6D, ASME B16.34, BS 1868, BS6364
Structural length: ASME B16.10, API 6D, GB/T 12221
Connection standards: ASME B16.5, ASME B16.47, ASME B16.25
Pressure test: API 598, API 6D, BS6364
Pressure and temperature rating: ASME B16.34, GB/T 12224
