Machinery's Handbook, 31st Edition
2770
Plastic Pipe Table 13. Pressure Ratings of Schedule 40, 80, 120 PVC Pipe Up To 12 ″ at 73.4°F
Maximum Water Pressure (psig)
Pipe Size
SCH 40
SCH 80
SCH 120
810 780 620 600 480 450 370 330 280 300 260 240 220 190 180 160 140 130
1230 1130 920 850
… … …
1 ⁄ 1 ⁄ 3 ⁄ 1 ⁄ 3 ⁄ 1
8 4 8 2 4
1010 770 720 600
690 630 520 470 400 420 370 350 320 290 280 250 230 230
1 1 ⁄ 1 1 ⁄
4 2
540 470 470 440
2
2 1 ⁄
2
3
…
3 1 ⁄
2
4 5 6 8
430
…
370 380
10 12
…
… Table 14. Pressure Derating Factors for PVC Pipe Temperature °F 73.4 80 90 100 110 120 130 140 °C 23 26.7 32.2 37.8 43.3 48.9 54.4 60
Derating Factor
1 0.88 0.75 0.62 0.5 0.4 0.3 0.22
when designing pipe systems where temperature will change between installation and operation, or when the fluids pumped will be above or below installation temperature. Plastics expand much more than metals, so this may become a factor in selecting one over the other. Use the factors in Table 15 to calculate length increase or decrease for each pipe run. To use the tabulated factors, use the equation D L = a L 0 D T where L 0 is the length at the installation temperature, and D T is the difference between the installation temperature and the temperature in question. Table 15. Coefficient of Linear Expansion ( a ) for Common Pipe Materials
Coefficient of Linear Expansion 10 –6 in/in ° F 10 –6 m/m ° C
Material
Carbon Steel
6.5 9.3 9.9 35 67 83 44
11.7 16.8 17.8 63 120 150 79
Copper
Stainless Steel
ABS HDPE CPVC PE
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