Specification No. Noninal diameter Inches External diameter Wall thickness of steel PTFE lining thickness DN 3/4 D S T 1 25 1 32 3 2.5 2 32 1 1/4 38 3 2.5 3 40 1 1/2 45 3 2.5 4 50 2 57 3.5 3 5 65 2 1/2 76 4 3 6 80 3 89 4.5 3.5 7 100 4 108 4 3.5 8 125 ...