Installation Guide

HOME-FLEX Underground 21
Natural Gas Sizing Tables
5.2 Natural Gas Sizing Tables
Table 5.2 Low Pressure Natural Gas (Less than 2 PSI with 0.3 in. w.c. drop)
Maximum Capacity of HOME-FLEX
TM
Underground Poly Pipe in BTU/h (British Thermal Units per Hour)
of Natural Gas by Length of Piping Run
(Approximate 1,000 BTU/h Natural Gas per 1 CFH; based on a 0.6 specic gravity of gas)
Inlet Pressure: Less than 2 PSI Pressure Drop: 0.3 in w.c.
Run (ft.)
IPS Pipe Size
(SDR)
½" (SDR 9.3) ¾" (SDR 11) 1" (SDR 11) 1¼" (SDR 10) 1½" (SDR 11) 2" (SDR 11)
10 153k 305k 551k 955k 1,440k 2,590k
20 105k 210k 379k 656k 991k 1,780k
30 84k 169k 304k 527k 796k 1,430k
40 72k 144k 260k 451k 681k 1,220k
50 64k 128k 231k 400k 604k 1,080k
60 58k 116k 209k 362k 547k 983k
70 53k 107k 192k 333k 503k 904k
80 50k 99k 179k 310k 468k 841k
90 46k 93k 168k 291k 439k 789k
100 44k 88k 159k 275k 415k 745k
125 39k 78k 141k 243k 368k 661k
150 35k 71k 127k 221k 333k 598k
175 32k 65k 117k 203k 306k 551k
200 30k 60k 109k 189k 285k 512k
250 27k 54k 97k 167k 253k 454k
300 24k 48k 88k 152k 229k 411k
350 22k 45k 81k 139k 211k 378k
400 21k 42k 75k 130k 196k 352k
450 19k 39k 70k 122k 184k 330k
500 18k 37k 66k 115k 174k 312k
k = 1,000 BTU/h EXAMPLE: 10k = 10,000 BTU/h = 10 CFH (Cubic Feet per Hour) of Natural Gas