size 1/2"-72" Type socket welding flange standard ASME B16.5 ASM E B16.47 MSS SP - 44 EN 1092 material stainless steel,carbon steel,Alloy steel qualification ISO9001 API CE packing Wooden case&pallets Application Petroleum, chemical, machinery, electric power, shipbuilding, papermaking, construction, etc Testing direct reading spectrometer,Hydrostatic test,X-Ray flaw detector,Ultrasonic flaw detector,Magentic particle inspection,etc Special design available as the requirement of customer