Standard and regulation
Design and manufacture: ANSI B16.34; API 602; GB/T12224; GB/T12228; GB/122235; GB/122236
Socket welding ends: ANSI B16.11; JIS B2306; JB/T1751
Threaded ends: ANSI B1.20.1:BS21; ISO7/1; JIS B0203
Inspection and test：API 598; JB/T9092
Structural form：B.B; Lift type or B.B; Swing type or B.B
Material：ANSI/ASTM
Body material：A105; F5; F11; F22; 304; 304L; 316; 316L; LF2