... /C 3.ISO 9001:2000,SGS,BV,etc FLANGESProduction NameSlip-on welding flange;welding nece flange;socket welding flange;threaded flange ... ,GB, SH, HG,QOST,ETC.CE and certification:ISO9001:2000 , API , BV , SGS, LOIYDApplications range: Petroleum, chemical, power, gas, metallurgy, shipbuilding ... , Brazil, Indonesia, Thailand, UAE, act ANSI16.5 A234 WPB Blind flanges