Product design and scope Design standard:BS 1868/API 6D Length of structure:ASMEB16.10/API 6D  Flange connecting end:ASME B16.5/ASME B16.47 Butt welding connecting end:ASME B16.25  Wall thickness:ASME B16.34 Inspection and test:API 598 /API 6D Pressure and temperature rating:ASME B16.34 Product scope:NPS 2″~NPS 48″,CL150~CL2500 Main body material:WCB?LCB?WCC?WC6?WC9?CF8?CF8M?CF3?CF3M?A890 4A etc.