Collapse pressure calculations are based onminimumwall thicknesses ( 871⁄2% of nominal wall thickness) and assume no contribution of strength by the liner. Maximum head calculations assume a 3:1 safety factor and 75% vacuum inside the pipe. For full vacuumconditions, subtract an additional 8.5 feet (2.6 m) from the tabulated values. 100 °F 150 °F Nominal Collapse Maximum Collapse Maximum Pipe Size Pressure Head Pressure Head ( in) (mm) ( psi) ( bar) ( ft) ( m) ( psi) ( bar) ( ft) ( m) 1 25 >5000 >350 >5000 >1500 >5000 >350 >5000 >1500 11⁄2 40 >5000 >350 >5000 >1500 >5000 >350 >5000 >1500 2 50 1457 100.5 1097 334.3 1412 97.4 1062 323.7 3 80 404 27.9 285 86.9 391 27.0 276 84.1 4 100 483 33.3 346 105.5 468 32.2 335 102.1 6 150 163 11.2 100 30.5 158 10.9 96 29.3 8 200 142 9.8 84 25.6 137 9.4 80 24.3 10 250 150 10.3 90 27.4 145 10.0 87 26.5 12 300 149 10.3 89 27.1 144 9.9 85 25.9 14 350 150 10.3 90 27.4 145 10.0 86 26.2 155** 10.7 94 28.7 150 10.3 90 27.4 16 400 152 10.5 91 27.7 147 10.1 88 26.8 146** 10.1 87 26.5 142 9.8 84 25.6 18 450 153 10.5 93 28.3 149 10.3 89 27.1 148** 10.2 88 26.8 143 9.9 85 25.9 20 500 154 10.6 93 28.3 150 10.3 90 27.4 149** 10.3 89 27.1 144 9.9 85 25.9 22 550 150** 10.3 90 27.4 145 10.0 86 26.2 24 600 150 10.3 90 27.4 145 10.0 86 26.2 150** 10.3 90 27.4 145 10.0 87 26.5 26 650 151** 10.4 91 27.7 146 10.1 87 26.5 28 700 151** 10.4 91 27.7 147 10.1 87 26.5 30 750 147 10.1 88 26.8 143 9.9 85 25.9 151** 10.4 91 27.7 147 10.1 87 26.5 32 800 152** 10.5 91 27.7 147 10.1 88 26.8 36 900 150 10.3 90 27.4 146 10.1 87 26.5 152** 10.5 92 28.0 148 10.2 88 26.8 40 1000 129** 8.9 74 22.6 125 8.6 71 21.6 ** Data for MCI pipe. External pressure rating 5
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