Natural Gas Piping; Propane Gas Piping; Pressure Testing The Gas Piping - Patterson-Kelley P-K MACH CM300 Installation & Owner's Manual

3.7.2 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
Length
Iron Pipe
Diameter
Size
(Inches)
(Inches)
90 o Ell
(Feet)
1- 1/4 1.380
1- 1/2 1.610
2 2.067
2- 1/2 2.469
3 3.068
4 4.026

3.7.3 Propane Gas Piping

The table below should be used to size the propane gas piping to the appliance. The approximate
energy content of propane gas is 2,500 BTU / cu. Ft:
Nominal Equivalent Pipe
Internal
Iron Pipe Length
Diameter
Size
(Inches)
(Inches)
90 o Ell
(Feet)
1- 1/4 1.380
1- 1/2 1.610
2 2.067
2- 1/2 2.469

3.7.4 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: January 3, 2020
Released: January 3, 2020
Pipe Capacity for Natural Gas
Maximum Capacity in Cubic Feet of Natural Gas Per Hour
Pressure Drop of 0.5 inch Water Column/Equivalent Length
of Pipe (in feet)
Tee
20
(Feet)
3.45 6.9 950
4.02 8.04 1460
5.17 10.3 2750
6.16 12.3 4350
7.67 15.3 7700
10.1 20.2 15800
Pipe Capacity for Propane Gas
Maximum Capacity in MBH Propane Gas
Pressure Drop of 0.5" W.C.
Equivalent Length of Pipe (in feet)
Tee
10
(Feet)
3.45 6.90 1900
4.02 8.04 2850
5.17 10.3 5490
6.16 12.3 8740
 Patterson-Kelley 2020
All Rights Reserved.
P-K MACH
Technical Service 1.877.728.5351
40 60 80
660 530 460
990 810 690
1900 1520 1300
3000 2400 2050
5300 4300 3700
10900 8800 7500
20 40 80
1305 900
1960 1345 925
3770 2590 1780
6010 4130 2840
1004905980 P-K MACH CM300-CM500&C750-C1050
Installation and Owners Manual (Rev F Jan-2020).docx
®
Gas Fired Boiler
100 150 200
400
620 500 430
1150 950 800
1850 1500 1280
3250 2650 2280
6700 5500 4600
150 300
1270 870
2020 1390
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