Installation Guide

44
Sizing/Capacity Tables
Table 7.1 Low Pressure (6 - 7 in w.c. with 0.5
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: 6-7 in w.c. (¼ PSI)
Pressure Drop: 0.5 in w.c.
Run (ft.)
Tubing Size
(EHD)
½" (EHD 18) ¾" (EHD 25) 1" (EHD 31)
5 100k 283k 626k
10 71k 200k 425k
15 59k 163k 338k
20 51k 141k 288k
25 46k 127k 254k
30 42k 116k 230k
40 37k 100k 195k
50 33k 89k 172k
60 30k 82k 156k
70 28k 76k 143k
75 27k 73k 137k
80 26k 71k 133k
90 25k 67k 124k
100 24k 63k 117k
125 21k 57k 103k
150 19k 52k 93k
200 17k 45k 79k
300 14k 37k 63k
400 12k 32k 54k
500 11k 28k 47k
Table 7.2 Low Pressure (6 - 7 in w.c. with 1
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: 6-7 in w.c. (¼ PSI)
Pressure Drop: 1 in w.c.
Run (ft.)
Tubing Size
(EHD)
½" (EHD 18) ¾" (EHD 25) 1" (EHD 31)
5 132k 406k 925k
10 95k 287k 627k
15 79k 234k 500k
20 69k 203k 426k
25 62k 182k 376k
30 57k 166k 339k
40 50k 143k 289k
50 45k 128k 255k
60 41k 117k 230k
70 38k 108k 211k
75 37k 105k 203k
80 36k 101k 196k
90 34k 96k 183k
100 32k 91k 173k
125 29k 81k 153k
150 27k 74k 138k
200 23k 64k 117k
300 19k 52k 93k
400 17k 45k 80k
500 15k 41k 70k
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.