Control systems Safety valves
4
Capacity Table - Steam - 3% Overpressure – lb/h
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 15 457 748 1171 1915 2741 4253 5356 6453 9511 16449 23842 20 529 866 1356 2217 3173 4924 6201 7471 11011 19043 27603 25 601 984 1541 2519 3605 5595 7045 8489 12512 21638 31363 30 673 1102 1725 2821 4037 6265 7890 9507 14012 24232 35124 35 745 1220 1910 3123 4470 6936 8735 10525 15512 26827 38884 40 817 1338 2095 3425 4902 7607 9580 11542 17012 29421 42645 50 961 1573 2464 4029 5766 8949 11269 13578 20013 34610 50166 60 1105 1809 2834 4633 6631 10290 12959 15614 23013 39799 57687 70 1251 2048 3207 5243 7504 11645 14665 17670 26043 45040 65284 80 1399 2291 3587 5865 8395 13027 16405 19767 29134 50385 73031 90 1548 2534 3968 6487 9285 14409 18146 21863 32224 55729 80777 100 1696 2777 4348 7109 10176 15791 19886 23960 35315 61074 88524 110 1844 3020 4729 7732 11066 17173 21626 26057 38405 66419 96271 120 1993 3263 5109 8354 11956 18554 23366 28154 41495 71763 104018 130 2141 3505 5490 8976 12847 19936 25106 30250 44586 77108 111765 140 2290 3748 5871 9598 13737 21318 26847 32347 47676 82452 119511 150 2438 3991 6251 10220 14628 22700 28587 34444 50767 87797 127258 160 2586 4234 6632 10842 15518 24082 30327 36541 53857 93142 135005 180 2883 4720 7393 12087 17299 26846 33807 40734 60038 103831 150499 190 3032 4963 7773 12709 18190 28227 35548 42831 63128 109176 158245 200 3180 5206 8154 13331 19080 29609 37288 44928 66218 114520 165992 230 3625 5935 9295 15197 21752 33755 42509 51218 75490 130554 189233 260 4071 6664 10437 17064 24423 37900 47729 57508 84761 146588 212473 270 4219 6907 10817 17686 25314 39282 49469 59605 87851 151933 220220 300 4664 7636 11959 19552 27985 43428 54690 65895 97122 167966 243460 G H J K L M N P Q
4.7 21
For sizing using current areas (ASME), the discharge coefficient K for steam is 0.853.
TI-P710-01 CTLS Issue 1
Page 7 of 13
SV44H Carbon Steel Safety Valve
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