ISO 9001 API CERTIFICATE COMPETITIVE PRICE EXCELLENT QUALIT 1. outside diameter: 21.3mm-1219.2mm2. wall thickness: sch5s,10s,40s,80s,std,xs,xxs,sch5-sch1603. standards: ANSI, DIN, JIS, BS, ISO, GB/T, JB, SH, HGS and so on.4. use: petroleum, chemical industry, medicine, electric power, astronautics, war industry, fire prevention, metallurgy, shipbuilding, fuel gas, nuclear electricity, urban ...