ASTM A 860 Specification for wrought High Strength Low Alloy Steel butt welding fittings-WPB, WPC, WPBW, WPHY 42, WPHY 46, WPHY 52, WPH 60, WPHY 65 ，WPHY 70. WPHY 100
MSS-P75 WPB, WPC, WPBW, WPHY 42, WPHY 46, WPHY 52, WPH 60, WPHY 65 ，WPHY 70. WPHY 100
AWWA C208 Dimensions for Fabricated Steel Water Pipe Fittings
BS 1640 Steel Butt Welding Pipe Fittings for the Petroleum Industry
