STEAM PROPERTIES & FLOW CHARACTERISTICS
STEAM CAPACITY TABLES
This chart provides a simple method for sizing steam pipes with velocities in the range of 7,000 to 10,000 ft/min. (Example: a 1” pipe with 100 PSIG steam pressure has a flow rate of 672 lbs/hr at a velocity of 7250 ft/min.)
STEAM CAPACITY – Flow in lbs/hr
FULL-PORT VALVE or PIPE SIZE
Temp. (˚F) (sat.)
1 / 4
3 / 8
1 / 2
3 / 4
1 1 / 2
1 1 1 / 4
2
2 1 / 2
3
3 1 / 2
4
5
6
8
10
12
Pressure (PSIG)
VELOCITY (FPM) 7062 7094 7125 7187 7250 7312 7375 7500 7625 7750
7875
8000
8250
8500
9000
9500
10000
250 406 176 324 518 916 1498 2615 3591 6018 8731 13700 18620 24360 39470 58730 107700 179200 267700 200 388 143 264 423 748 1223 2135 2932 4913 7128 11190 15200 19880 32230 47950 87910 146300 218500 175 378 127 235 375 664 1086 1895 2603 4361 6328 9931 13490 17650 28610 42560 78040 129800 194000 150 366 111 205 328 580 948 1655 2273 3810 5528 8675 11790 15420 24990 37180 68170 113400 169500 125 353 95 175 280 496 811 1415 1943 3256 4724 7414 10070 13180 21360 31780 58260 96940 144800 100 338 79 145 232 411 672 1173 1612 2701 3919 6150 8356 10930 17720 26360 48330 80410 120100 90 331 72 133 213 377 617 1076 1478 2477 3594 5641 7665 10030 16250 24180 44330 73760 110200 80 324 66 121 194 343 561 979 1345 2254 3270 5132 6973 9122 14780 22000 40330 67100 100300 70 316 59 109 175 309 505 881 1211 2029 2943 4619 6277 8211 13310 19800 36300 60400 90240 60 308 53 97 155 274 449 783 1076 1803 2616 4105 5577 7296 11820 17590 32260 53670 80190 50 298 46 85 136 240 392 684 940 1575 2286 3587 4874 6376 10330 15380 28190 46900 70080 40 287 39 72 116 205 335 585 803 1346 1953 3066 4166 5449 8831 13140 24090 40080 59890 30 274 33 60 96 170 278 485 666 1115 1618 2539 3451 4514 7315 10880 19960 33200 49610 25 267 29 54 86 152 249 434 596 999 1449 2274 3090 4042 6551 9747 17870 29730 44430 20 259 26 47 76 134 219 383 526 881 1279 2006 2726 3566 5780 8600 15770 26230 39200 15 250 22 41 66 116 190 331 455 763 1107 1737 2360 3087 5003 7444 13650 22710 33930 10 240 19 35 55 98 160 279 384 643 933 1464 1990 2603 4218 6276 11510 19150 28610 5 228 15 28 45 79 130 227 311 522 757 1188 1615 2112 3423 5093 9339 15540 23220 0 212 11 21 34 60 97 170 233 391 568 891 1210 1583 2566 3818 7000 11650 17400
This table represents steam loss thru an orifice on a failed open steam trap, assuming that 25% of the flow consists of condensate.
STEAM FLOW – thru various orifice diameters discharging to atmosphere (0 PSIG) in lbs/hr Orifice Diameter Inlet Pressure (PSIG) (Inches) 2 5 10 15 25 50 75 100 125 150 200 250 300 1/32 0.31 0.47 0.58 0.70 0.94 1.53 2.12 2.70 3.30 3.90 5.10 6.30 7.40 1/16 1.25 1.86 2.30 2.80 3.80 6.10 8.50 10.80 13.20 15.60 20.30 25.10 29.80 3/32 2.81 4.20 5.30 6.30 8.45 13.80 19.10 24.40 29.70 35.10 45.70 56.40 67.00 1/8 4.50 7.50 9.40 11.20 15.00 24.50 34.00 43.40 52.90 62.40 81.30 100.00 119.00 5/32 7.80 11.70 14.60 17.60 23.50 38.30 53.10 67.90 82.70 97.40 127.00 156.00 186.00 3/16 11.20 16.70 21.00 25.30 33.80 55.10 76.40 97.70 119.00 140.00 183.00 226.00 268.00 7/32 15.30 22.90 28.70 34.40 46.00 75.00 104.00 133.00 162.00 191.00 249.00 307.00 365.00 1/4 20.00 29.80 37.40 45.00 60.10 98.00 136.00 173.00 212.00 250.00 325.00 401.00 477.00 9/32 25.20 37.80 47.40 56.90 76.10 124.00 172.00 220.00 268.00 316.00 412.00 507.00 603.00 5/16 31.20 46.60 58.50 70.30 94.00 153.00 212.00 272.00 331.00 390.00 508.00 627.00 745.00 11/32 37.70 56.40 70.70 85.10 114.00 185.00 257.00 329.00 400.00 472.00 615.00 758.00 901.00 3/8 44.90 67.10 84.20 101.00 135.00 221.00 306.00 391.00 478.00 561.00 732.00 902.00 1073.00 13/32 52.70 78.80 98.80 119.00 159.00 259.00 359.00 459.00 559.00 659.00 859.00 1059.00 1259.00 7/16 61.10 91.40 115.00 138.00 184.00 300.00 416.00 532.00 648.00 764.00 996.00 1228.00 1460.00 15/32 70.20 105.00 131.00 158.00 211.00 344.00 478.00 611.00 744.00 877.00 1144.00 1410.00 1676.00 1/2 79.80 119.00 150.00 180.00 241.00 392.00 544.00 695.00 847.00 998.00 1301.00 1604.00 1907.00
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