Installation Guide

48
Sizing/Capacity Tables
Table 7.11 Gas with a Pressure of ½ PSI or less and a pressure drop of 0.5 in w.c.
Maximum Capacity of Schedule 40 Metallic Pipe in Cubic Feet per Hour (CFH) of Natural Gas (Approximate 1000 BTU per cubic foot)
Maximum Gas Pressure: 0.5 PSI Pressure Drop: 0.5 in w.c. (Based on a 0.6 specic gravity of gas)
Tube Size
Tubing Length (ft)
10 20 30 40 50 60 70 80 90 100 125 150 175 200
¼" 43 29 24 20 18 16 15 14 13 12 11 10 9 8
⁄" 95 65 52 45 40 36 33 31 29 27 24 22 20 19
½" 175 120 97 82 73 66 61 57 53 50 44 40 37 35 ¾" 360 250 200 170 151 138 125 118 110 103 93 84 77 72
1" 680 465 375 320 285 260 240 220 205 195 175 160 145 135
1¼" 1400 950 770 660 580 530 490 460 430 400 360 325 300 280 1½" 2100 1460 1180 990 900 810 750 690 650 620 550 500 460 430
2" 3950 2750 2200 1900 1680 1520 1400 1300 1220 1150 1020 950 850 800
2½" 6300 4350 3520 3000 2650 2400 2250 2050 1950 1850 1650 1500 1370 1280
3" 11000 7700 6250 5300 4750 4300 3900 3700 3450 3250 2950 2650 2450 2280 4" 23000 15800 12800 10900 9700 8800 8100 7500 7200 6700 6000 5500 5000 4600