P-K Storm
TM
Gas Fired Boiler
Technical Service 1.877.728.5351
Revised: June 26, 2020
Released: June 26, 2020
©
Patterson-Kelley 2020
All Rights Reserved.
2691000273 P-K Storm ST2500-ST4000
Installation and Owners Manual Rev A.docx
Page 38
Pipe Capacity for Natural Gas
Nominal
Iron Pipe
Size
(Inches)
Internal
Diameter
(Inches)
Equivalent Pipe
Length
Maximum Capacity in Cubic Feet of Natural Gas Per Hour
Pressure Drop of 0.5” W.C.
Equivalent Length of Pipe (in feet)
90° Elb
(Feet)
Tee
(Feet)
20
40
60
80
100
150
200
2
2.067
5.17
10.3
2750
-
-
-
-
-
-
2- 1/2
2.469
6.16
12.3
4350
3000
2400
2050
1850
1500
-
3
3.068
7.67
15.3
7700
5300
4300
3700
3250
2650
2280
4
4.026
10.1
20.2
15800
10900
8800
7500
6700
5500
4600
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.
