Control systems Safety valves
4
Capacity Table - Steam - 10% 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 15 471 771 1208 1975 2827 4387 5525 6657 9811 16968 24594 20 543 889 1393 2277 3259 5058 6370 7675 11311 19562 28355 25 615 1007 1578 2579 3692 5729 7214 8692 12812 22157 32115 30 687 1125 1762 2881 4124 6399 8059 9710 14312 24751 35876 35 767 1255 1965 3213 4599 7137 8988 10830 15962 27605 40013 40 846 1385 2169 3546 5075 7875 9918 11950 17612 30459 44149 50 1004 1644 2575 4210 6026 9351 11776 14189 20913 36167 52423 60 1163 1904 2981 4875 6977 10827 13634 16428 24213 41875 60696 70 1321 2163 3388 5539 7928 12303 15493 18667 27514 47583 68969 80 1480 2423 3794 6203 8879 13778 17351 20907 30814 53291 77242 90 1638 2682 4201 6868 9830 15254 19210 23146 34114 58998 85516 100 1797 2942 4607 7532 10781 16730 21068 25385 37415 64706 93789 110 1955 3201 5013 8197 11732 18206 22927 27624 40715 70414 102062 120 2114 3461 5420 8861 12683 19681 24785 29864 44016 76122 110336 130 2272 3720 5826 9526 13634 21157 26644 32103 47316 81830 118609 140 2431 3980 6233 10190 14585 22633 28502 34342 50616 87538 126882 150 2589 4239 6639 10854 15536 24109 30361 36581 53917 93245 135155 160 2748 4499 7045 11519 16487 25584 32219 38821 57217 98953 143429 180 3065 5018 7858 12848 18389 28536 35936 43299 63818 110369 159975 190 3223 5277 8265 13512 19340 30012 37795 45538 67119 116077 168249 200 3382 5537 8671 14177 20291 31488 39653 47778 70419 121785 176522 230 3857 6315 9890 16170 23144 35915 45229 54496 80320 138908 201342 260 4333 7094 11109 18163 25996 40342 50804 61213 90222 156032 226162 270 4491 7353 11516 18828 26947 41818 52663 63453 93522 161740 234435 300 4967 8132 12735 20821 29800 46245 58238 70170 103423 178863 259255 G H J K L M N P Q
4.7 23
For sizing using current areas (ASME), the discharge coefficient K for steam is 0.853.
TI-P710-01 CTLS Issue 1
Page 9 of 13
SV44H Carbon Steel Safety Valve
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