Technical Specification: Design Reference: API/ASME Design Standard: API 6D/ASME B16.34 Structure length(flange and welded):API 6D/ASME B16.10 Flange ends: ASME B16.5 Butt-welding ends: ASME B16.25 Test & inspection: API 6D/API 598 Major Parts material: bonnet: ASTM A105 NUT: ASTM A194-2H GASKET: PTFE STUD:ASTM A193-B7 BODY:ASTM A105 SEAT: PTFE BALL: ASTM A105+HCr Stem: ASTM A276-410 RING:AISI 1566 PACKING GLAND: ASTM A216-WCB