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Steam Flow Rate and Pressure Drop - Schedule 40 Pipe

Flow rate (lb/h) and pressure drop per 100 feet of pipe

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The table below can be used to determine the flow rate in schedule 40 steel pipes at pressure drops ranging from 1/16 to 2 psi:

Flow Rate (lb/h)
Nominal pipe size (inch) Pressure drop per 100 ft of pipe length
1/16 psi
(1 oz/in2)		 1/8 psi
(2 oz/in2)		 1/4 psi
(4 oz/in2)		 1/2 psi
(8 oz/in2)		 3/4 psi
(12 oz/in2)		 1 psi 2 psi
Sat. Press. 3.5 psig 12 Sat. Press. 3.5 psig 12 Sat. Press. 3.5 psig 12 Sat. Press. 3.5 psig 12 Sat. Press. 3.5 psig 12 Sat. Press. 3.5 psig 12 Sat. Press. 3.5 psig 12
3/4 9 11 14 16 20 24 29 35 36 43 42 50 60 73
1 17 21 26 31 37 46 54 66 68 82 81 93 114 137
1 1/4 36 45 53 66 78 96 111 138 140 170 162 200 232 280
1 1/2 56 70 84 100 120 147 174 210 218 260 246 304 360 430
2 108 134 162 194 234 285 336 410 420 510 480 590 710 850
2 1/2 174 215 258 310 378 460 540 660 680 820 780 950 1150 1370
3 318 380 465 550 660 810 960 1160 1190 1430 1380 1670 1950 2400
3 1/2 462 550 670 800 990 1218 1410 1700 1740 2100 2000 2420 2950 3450
4 640 800 950 1160 1410 1690 1980 2400 2450 3000 2880 3460 4200 4900
5 1200 1430 1680 2100 2440 3000 3570 4250 4380 5250 5100 6100 7500 8600
6 1920 2300 2820 3350 3960 4850 5700 6800 7000 8600 8400 10000 11900 14200
8 3900 4800 5570 7000 8100 10000 11400 14300 14500 17700 16500 20500 24000 29500
10 7200 8800 102000 12600 15000 18200 21000 26000 26200 32000 30000 37000 42700 52000
12 11400 13700 16500 19500 23400 28400 33000 40000 41000 49500 48000 57500 67800 81000

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