Installation Guide

22
Sizing/Capacity Tables
Table 5.3 Low Pressure Natural Gas (Less than 2 PSI with 0.5 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: 0.5 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 201k 403k 726k 1,260k 1,900k 3,410k
20 138k 277k 499k 865k 1,310k 2,350k
30 111k 222k 401k 695k 1,050k 1,880k
40 95k 190k 343k 594k 898k 1,610k
50 84k 169k 304k 527k 796k 1,430k
60 76k 153k 276k 477k 721k 1,300k
70 70k 140k 254k 439k 663k 1,190k
80 65k 131k 236k 409k 617k 1,110k
90 61k 123k 221k 383k 579k 1,040k
100 58k 116k 209k 362k 547k 983k
125 51k 103k 185k 321k 485k 871k
150 46k 93k 168k 291k 439k 789k
175 43k 86k 154k 268k 404k 726k
200 40k 80k 144k 249k 376k 675k
250 35k 71k 127k 221k 333k 598k
300 32k 64k 115k 200k 302k 542k
350 29k 59k 106k 184k 278k 499k
400 27k 55k 99k 171k 258k 464k
450 26k 51k 93k 160k 242k 435k
500 24k 48k 88k 152k 229k 411k
k = 1,000 BTU/h EXAMPLE: 10k = 10,000 BTU/h = 10 CFH (Cubic Feet per Hour) of Natural Gas