... JIS,BS,DIN.UNI,ANSI/ASTM ASME,,API, NF ,GOST and Non Standard4. Size:1/2"-40"5 ... joint flanges,Welding neck flanges,Socket welding flanges and Treaded flanges,Square flanges etc.6. Pressure ... staff :10-15.15. Inspection :in-house and the third party16. Used for : petroleum,chemical, ... wall thickness.18. Our objective:Survival by quality and development by credibility,Quality first, Customer upmost .19 ...