Installation Guide

46
Sizing/Capacity Tables
Table 7.5 Elevated Pressure (2 PSI with 1 PSI
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
: 2 PSI Pressure Drop: 1 PSI
Run (ft.)
Tubing Size
(EHD)
½" (EHD 18) ¾" (EHD 25) 1" (EHD 31)
5 577k 1,982k 5,870k
10 408k 1,421k 4,065k
15 333k 1,170k 3,279k
20 289k 1,019k 2,815k
25 258k 915k 2,501k
30 236k 839k 2,271k
40 204k 730k 1,950k
50 183k 656k 1,732k
60 167k 601k 1,573k
70 154k 558k 1,449k
75 149k 540k 1,397k
80 144k 524k 1,350k
90 136k 495k 1,269k
100 129k 471k 1,200k
125 115k 423k 1,066k
150 105k 387k 968k
200 91k 337k 831k
300 75k 278k 670k
400 65k 242k 575k
500 58k 217k 511k
Table 7.6 Elevated Pressure (5 PSI with 3.5
PSI 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
: 5 PSI Pressure Drop: 2.5 PSI
Run (ft.)
Tubing Size
(EHD)
½" (EHD 18) ¾" (EHD 25) 1" (EHD 31)
5 1,131k 3,855k 11,881k
10 828k 2,783k 8,228k
15 690k 2,300k 6,637k
20 606k 2,009k 5,698k
25 548k 1,809k 5,063k
30 505k 1,661k 4,596k
40 444k 1,451k 3,946k
50 401k 1,306k 3,506k
60 370k 1,199k 3,183k
70 345k 1,115k 2,934k
75 334k 1,080k 2,828k
80 325k 1,047k 2,733k
90 308k 991k 2,568k
100 294k 943k 2,428k
125 266k 849k 2,157k
150 245k 779k 1,959k
200 215k 681k 1,682k
300 179k 563k 1,357k
400 157k 492k 1,165k
500 142k 443k 1,035k
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.