WELDING NECK FLANGE 1.ANSI JIS DIN EN1092-1 BS4504 UNI 2.150LB- ... FL reducing flange is widely used in petroleum, chemical, power, gas, metallurgy, shipbuilding, construction, etcperformed.specificationsWELDING NECK FLANGE 1.ANSI JIS DIN ... :(1).ASME/ANSI B16.5 : WELDING NECK FLANGE, SLIP-ON FLANGE, BLIND FLANGE,HIGH HUB BLIND FLANGE, SOCKET WELD FLANGE.LAPJOINT FLANGE, THREADED FLANGE. RING TYPE ...