1, API 602 Bs5352 ANSI B16.34
2. Connection end size:
1) the socket size according to the size of the socket;JB/T1751
2) the thread end size is ANSI B1.20.1JB/T7306
3) the end size of the butt welding is AN Sl B16.25; JB/T12224
4) flange end size ANSI B1 6.5; JB79
3. Examination and test:
API 598; GB/T13927; JB/T9092