Gas Orifice Capacity Chart GAS USE IN BTUS PER HOUR AGAINST A GIVEN ORIFICE SIZE (DRILL SIZE) Drill Size Decimal Equivalent Gas Pressure > Natural Gas 3.0 3.5 4.0 LP Gas 4.5 7.0 11.0 654 755 874 919 1163 1436 1583 1818 2068 2244 2427 2815 3062 3451 3518 3677 3910 4399 4654 4916 5185 5461 5745 6036 6334 6639 7764 7898 9709 10862 12712 14026 14479 16119 17594 19135 20740 21902 22127 23558 24144 26557 28442 31391 31592 33092 34485 35549 36992 38837 40726 42975 43447 44241 45849 48316 51706 56104 59290 66413 70881 70982 74456 77591 80253 82959 85157 87719 88507 90776 93074 98945 103161 106103 107465 112492 116338 118938 122891 126235 128263 130992 134443 137940 142194 145067 148114 149430 151635 156844 162906 171898 175372 186658 1273 1469 1700 1788 2263 2794 3081 3536 4024 4366 4722 5476 5956 6713 3843 7153 7607 8557 9053 9563 10087 10625 11176 11742 12322 12916 15104 15365 18888 21131 24730 27286 28167 31357 34228 37225 40347 42608 43045 45831 46969 51663 55331 61067 61460 64377 37087 69156 71964 75553 79229 83603 84522 86066 89195 93994 100588 109145 115343 129200 127992 138088 144847 150946 156123 161389 165664 170649 172181 176596 181066 192487 200690 206413 209063 218843 226324 231381 239072 245577 249522 254831 261546 268348 276625 282213 288141 290701 294991 305125 316916 334411 341169 363124 Gas Use in Btus/Hr 80 79 1/64 78 77 76 75 74 73 72 71 70 69 68 1/32 67 66 65 64 63 62 61 60 59 58 57 56 3/64 55 54 53 1/16 52 51 50 49 48 5/64 47 46 45 44 43 42 3/32 41 40 39 38 37 36 7/64 35 34 33 32 31 1/8 30 29 28 9/64 27 26 25 24 23 5/32 22 21 20 19 18 11/64 17 16 15 14 13 3/16 12 11 10 9 8 7 13/64 6 5 4 3 7/32 2 1 .0135 .0145 .0156 .0160 .0180 .0200 .0210 .0225 .0240 .0250 .0260 .0280 .0292 .0310 .0313 .0320 .0330 .0350 .0360 .0370 .0380 .0390 .0400 .0410 .0420 .0430 .0465 .0469 .0520 .0550 .0595 .0625 .0635 .0670 .0700 .0730 .0760 .0781 .0785 .0810 .0820 .0860 .0890 .0935 .0938 .0960 .0980 .0995 .1015 .1040 .1065 .1094 .1100 .1110 .1130 .1160 .1200 .1250 .1285 .1360 .1405 .1406 .1440 .1470 .1495 .1520 .1540 .1563 .1570 .1590 .1610 .1660 .1695 .1719 .1730 .1770 .1800 .1820 .1850 .1875 .1890 .1910 .1935 .1960 .1990 .2010 .2031 .2040 .2055 .2090 .2130 .2188 .2210 .2280 428 494 572 602 762 940 1037 1190 1354 1469 1589 1843 2004 2259 2303 2407 2560 2880 3046 3218 3394 3575 3761 3951 4147 4346 5083 5171 6356 7111 8322 9182 9478 10552 11518 12527 13577 14338 14485 15423 15806 17385 18620 20550 20682 21664 22576 23272 24217 25425 26662 28133 28443 28962 30015 31630 33849 36729 38815 43478 46402 46469 48743 50795 52538 54309 57748 57426 57941 59427 60931 64775 67535 69461 70353 73644 76161 77863 80451 82640 83968 85754 88014 90303 93088 94969 96963 97825 99269 102679 106647 112534 114808 122196 463 534 618 650 823 1016 1120 1285 1462 1587 1716 1991 2165 2440 2487 2600 2765 3110 3291 3476 3666 3862 4062 4268 4479 4695 5490 5585 6865 7680 8989 9918 10238 11398 12441 13530 14665 15487 15646 16658 17072 18778 20111 22197 22339 23399 24384 25137 26157 27462 28798 30388 30722 31283 32420 34165 36562 39672 41924 46961 50120 50192 52649 54865 56747 58661 60215 62027 62584 64188 65813 69965 72946 75026 75990 79544 82263 84102 86897 89261 90695 92625 95066 97538 100547 102578 104732 105663 107222 110906 115192 121550 124007 131987 495 571 661 695 879 1086 1197 1374 1563 1696 1835 2128 2314 2608 2659 2779 2956 2235 3518 3716 3919 4128 4343 4563 4788 5019 5869 5970 7339 8211 9609 10603 10945 12184 13300 14464 15678 16556 16726 17809 18251 20075 21500 23729 23882 25015 26068 26872 27963 29358 30786 32486 32843 33443 34659 36524 39068 42411 44819 50204 53581 53657 56284 58653 60665 62711 64372 66309 66905 68620 70357 74795 77982 80206 81236 85036 87943 89908 92897 95425 96957 99020 101629 104272 107489 109660 111964 112958 114626 118563 123145 129943 132569 141100 525 605 701 737 933 1152 1270 1457 1658 1799 1946 2257 2455 2767 2820 2948 3135 3527 3731 3941 4157 4379 4606 4840 5078 5323 6225 6333 7785 8709 10192 11246 11609 12924 14107 15342 16629 17560 17741 18889 19358 21293 22804 25168 25330 26532 27649 28502 29660 31139 32654 34456 34835 35472 36761 38739 41457 44984 47538 53249 56831 56912 59698 62211 64345 66515 68277 70332 70963 72783 74625 79332 82713 85072 86164 90195 93278 95362 98532 101213 102839 105027 107794 110598 114009 116312 118755 119810 121579 125755 130615 137825 140611 149659