Installation Guide

HOME-FLEX CSST 49
Steel Pipe Capacity Chart
Table 7.11 Natural Gas (½ PSI or less with 0.5 in w.c. drop)
Maximum Capacity of Schedule 40 Metallic 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)
Maximum Gas Pressure:
½ PSI Pressure Drop: 0.5 in w.c.
Run
(ft.)
Metallic Schedule 40 IPS Pipe Size
¼" ⁄" ½" ¾" 1" 1¼" 1½" 2" 2½" 3" 4"
10 43k 95k 175k 360k 680k 1,400k 2,100k 3,950k 6,300k 11,000k 23,000k
20 29k 65k 120k 250k 465k 950k 1,460k 2,750k 4,350k 7,700k 15,800k
30 24k 52k 97k 200k 375k 770k 1,180k 2,200k 3,520k 6,250k 12,800k
40 20k 45k 82k 170k 320k 660k 990k 1,900k 3,000k 5,300k 10,900k
50 18k 40k 73k 151k 285k 580k 900k 1,680k 2,650k 4,750k 9,700k
60 16k 36k 66k 138k 260k 530k 810k 1,520k 2,400k 4,300k 8,800k
70 15k 33k 61k 125k 240k 490k 750k 1,400k 2,250k 3,900k 8,100k
80 14k 31k 57k 118k 220k 460k 690k 1,300k 2,050k 3,700k 7,500k
90 13k 29k 53k 110k 205k 430k 650k 1,220k 1,950k 3,450k 7,200k
100 12k 27k 50k 103k 195k 400k 620k 1,150k 1,850k 3,250k 6,700k
125 11k 24k 44k 93k 175k 360k 550k 1,020k 1,650k 2,950k 6,000k
150 10k 22k 40k 84k 160k 325k 500k 950k 1,500k 2,650k 5,500k
175 9k 20k 37k 77k 145k 300k 460k 850k 1,370k 2,450k 5,000k
200 8k 19k 35k 72k 135k 280k 430k 800k 1,280k 2,280k 4,600k
k = 1,000 BTU/h EXAMPLE: 10k = 10,000 BTU/h = 10 CFH (Cubic Feet per Hour) of Natural Gas