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Natural Gas Piping
The table below should be used to size the natural gas piping to the appliance. The approximate
energy content of natural gas is 1,000 BTU / cu. Ft:
Nominal
Equivalent Pipe
Internal
Iron Pipe
Length
Diameter
Size
(Inches)
(Inches)
90 ° Elb
(Feet)
2
2.067
2- 1/2
2.469
3
3.068
4
4.026
Pressure Testing the Gas Piping
The appliance and all gas piping connections should be pressure-tested and must be checked for leaks
before being placed into service. The appliance must be disconnected at the manual shut-off valve
(located at the end of the supplied gas train) from the gas supply piping during any pressure testing of
the system at pressures in excess of 0.0723 psig (2" W.C.). Perform the pressure test with compressed
air or inert gas if possible.
Some leak test methods, including the use of soap and water, may cause corrosion of the carbon steel
gas pipe fittings. If using soap and water or a similar leak test method, make sure to clean off all
moisture from the gas pipe fittings prior to placing the appliance into service.
Revised: December 8, 2021
Released: December 8, 2021
Pipe Capacity for Natural Gas
Maximum Capacity in Cubic Feet of Natural Gas Per Hour
Pressure Drop of 0.5" W.C.
Equivalent Length of Pipe (in feet)
Tee
(Feet)
5.17
10.3
2750
6.16
12.3
4350
7.67
15.3
7700
10.1
20.2
15800
Patterson-Kelley 2021
All Rights Reserved.
20
40
60
-
-
3000
2400
5300
4300
10900
8800
TM
P-K Storm
Gas Fired Boiler
Technical Service 1.877.728.5351
80
100
150
-
-
-
2050
1850
1500
3700
3250
2650
7500
6700
5500
2691000273 P-K Storm ST2500-ST6000
Installation and Owners Manual Rev C.docx
200
-
-
2280
4600
Page 45
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