Control systems Safety valves
4
Capacity Table - AIR - 10% Overpressure - SCFM (60ºF and 14.7 psi)
Orifice Designation / Current Area (in²)
Set pressure (psi g)
F R 0.328 0.537 0.841 1.375 1.968 3.054 3.846 4.634 6.830 11.812 17.121 15 168 275 430 703 1007 1562 1967 2371 3494 6043 8758 20 193 317 496 811 1161 1801 2268 2733 4028 6966 10098 25 219 359 562 918 1315 2040 2569 3096 4562 7890 11437 30 245 401 628 1026 1469 2279 2870 3458 5097 8814 12776 35 273 447 700 1144 1638 2542 3201 3857 5684 9831 14249 40 301 493 772 1263 1807 2805 3532 4255 6272 10847 15722 50 358 586 917 1499 2146 3330 4194 5053 7447 12880 18669 60 414 678 1062 1736 2485 3856 4855 5850 8623 14912 21615 70 471 770 1206 1973 2823 4381 5517 6648 9798 16945 24561 80 527 863 1351 2209 3162 4907 6179 7445 10973 18978 27507 90 583 955 1496 2446 3501 5432 6841 8243 12149 21010 30454 100 640 1048 1641 2682 3839 5958 7503 9040 13324 23043 33400 110 696 1140 1785 2919 4178 6483 8165 9837 14499 25076 36346 120 753 1232 1930 3156 4517 7009 8826 10635 15675 27108 39292 130 809 1325 2075 3392 4855 7534 9488 11432 16850 29141 42239 140 866 1417 2220 3629 5194 8060 10150 12230 18025 31174 45185 150 922 1510 2364 3865 5533 8585 10812 13027 19201 33206 48131 160 979 1602 2509 4102 5871 9111 11474 13825 20376 35239 51077 180 1091 1787 2798 4575 6548 10162 12797 15420 22727 39304 56970 190 1148 1879 2943 4812 6887 10688 13459 16217 23902 41337 59916 200 1204 1972 3088 5049 7226 11213 14121 17014 25077 43370 62862 230 1374 2249 3522 5758 8242 12790 16107 19407 28603 49468 71701 260 1543 2526 3956 6468 9258 14366 18092 21799 32129 55566 80540 270 1599 2619 4101 6705 9596 14892 18754 22597 33305 57598 83486 300 1769 2896 4535 7415 10612 16469 20740 24989 36831 63696 92325 G H J K L M N P Q
4.7 25
For sizing using current areas (ASME), the discharge coefficient K for air, gases and vapours is 0.853
TI-P710-01 CTLS Issue 1
Page 11 of 13
SV44H Carbon Steel Safety Valve
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