Diameter:500 to 6300mm Standard:ASME,EN,DIN,BS etc. Certificates:9 ship classification society(DNV,BV,ABS,GL, ISO9001:2008 Advantage:1--Quality control and management to the whole produce process, including material inspection, forging, heat treatment, machining and strictly final inspection by Technology Department,Production department,Quality assurance department. 2--Excellent quality and ...