... /2'' to 24'' 2.T/T,L/C 3.ISO 9001:2000,SGS,BV,etc FLANGESProduction NameSlip-on welding flange;welding nece ... , BS,GB, SH, HG,QOST,ETC.CE and certification:ISO9001:2000 , API , BV , SGS, LOIYDApplications range: Petroleum, chemical, power, gas, metallurgy ...