... Should implement standard Design specification: JB/T 7746, API602 Structure length: JB/T 7746, factory norms Socket/thread: JB/T1751 / GB7306, ANSI B16 ... .11 / B2.1 Test and inspection: 9092, API598 JB/T Pressure-temperature: GB/T 9131, ANSI B16.34 Label ... : GB/T 12220, MSS SP25 Supply standard: 7928 JB/T A performance standard Test project strength test seal test ...