Installation Guide

HOME-FLEX CSST 45
Natural Gas Sizing Tables
Table 7.3 Regulator Outlet (8 - 10 in w.c.
with 3 in drop)
Maximum Capacity of HOME-FLEX® CSST in BTU/h
(British Thermal Units per Hour) of Natural Gas
by Length of Tubing Run
(Approximate 1,000 BTU/h Natural Gas per 1 CFH; based
on a 0.6 specic gravity of gas)
Inlet Pressure: 8-10 in w.c.
Pressure Drop: 3 in w.c.
Run (ft.)
Tubing Size
(EHD)
½" (EHD 18) ¾" (EHD 25) 1" (EHD 31)
5 222k 692k 1,717k
10 160k 493k 1,165k
15 132k 404k 928k
20 116k 351k 790k
25 104k 314k 697k
30 96k 288k 630k
40 84k 250k 536k
50 75k 224k 473k
60 69k 205k 427k
70 64k 190k 392k
75 62k 184k 377k
80 60k 178k 363k
90 57k 168k 340k
100 54k 159k 321k
125 49k 143k 283k
150 45k 131k 256k
200 39k 114k 218k
300 32k 93k 173k
400 28k 81k 148k
500 25k 72k 130k
Table 7.4 Medium Pressure (12 - 14 in w.c.
with 6 in drop)
Maximum Capacity of HOME-FLEX® CSST in BTU/h
(British Thermal Units per Hour) of Natural Gas
by Length of Tubing Run
(Approximate 1,000 BTU/h Natural Gas per 1 CFH; based
on a 0.6 specic gravity of gas)
Inlet Pressure
: 12-14 in w.c. (½ PSI)
Pressure Drop: 6 in w.c.
Run (ft.)
Tubing Size
(EHD)
½" (EHD 18) ¾" (EHD 25) 1" (EHD 31)
5 308k 1,058k 2,536k
10 222k 764k 1,720k
15 184k 631k 1,371k
20 161k 552k 1,167k
25 145k 497k 1,030k
30 133k 456k 930k
40 116k 398k 791k
50 104k 359k 698k
60 96k 329k 631k
70 89k 306k 579k
75 86k 296k 557k
80 84k 287k 537k
90 79k 272k 503k
100 75k 259k 474k
125 68k 233k 418k
150 62k 214k 378k
200 54k 187k 321k
300 45k 154k 256k
400 39k 135k 218k
500 35k 121k 192k
k = 1,000 BTU/h EXAMPLE: 10k = 10,000 BTU/h = 10 CFH (Cubic Feet per Hour) of Natural Gas
Equivalent Hydraulic Diameter (EHD): A theoretical sizing which is used to compare the
hydraulic performance between manufacturers. A higher EHD number indicates greater
ow capacity of piping.
Tables include losses for four 90 degree bends and two (2) end ttings. Tubing runs with
larger numbers of bends and/or tting shall be increased by an equivalent length of tubing
according to the following formula: L = 1.3 x (n) where L is the additional length of tubing
necessary and n is the number of additional ttings and/or bends.