... ISO 9001 international management system certified and a grade member of CNPC and sinopec,plus a qualified supplier for CNOOC. We ... licence of the PRC for grade A and B pressure pipelines, and grade and pipe fitting manufacturing license,1) Size: ... : stainless steel, alloy steel,carbon steel3) Standard: ASME / ANSI, DIN, JIS4) Usage: Petroleum, chemical, electricity power, gas, metallurgy, ship ...