Desgn standard: API 608 & API 6D, BS 5351& GB/ 12237

Face to face ANSI B 16.10 & GB/T 12221

Flang standard: ANSI B 16.5 JB/T 74~90, GB/T 9113.1~9113.4--2000, DIN 2543~2548

Temperature pressure: ANSI B 16.34

Test standard: API 598 & JB/T 9092

Fire safe standard: API 607/API SPE 6FA , BS 6755 PART 2