ASME/ANSI B36.10/19
4 inches (100 mm) Schedule 80 pipe has an outside diameter of 4.500 inches ( 114.30 mm), a wall thickness of 0.337 inches (8.56 mm), giving a bore of 3.826 inches (97.18 mm) Carbon, Alloy and Stainless Steel Pipes - ASME/ANSI B36.10/19 -. For full table with Pipe and Water Weight -. 1 kg = 2.2046 lb.