MACH® Series
Gas-Fired Boiler
Installation
Page 14
Pipe Capacity for Natural Gas
Equivalent Pipe Length
Maximum Capacity in Cubic Feet of Natural Gas per Hour
Pressure Drop of 0.5 inch Water Column/Equivalent Length of Pipe
(in feet)
Nominal
Iron Pipe
Size
(Inches)
Internal
Diameter
(Inches)
90º Ell
(Feet)
Tee
(Feet)
20
40
60
80
100
150
200
1/2
0.622
1.55
3.1
120
82
66
57
50
40
35
3/4
0.824
2.06
4.12
250
170
138
118
103
84
72
1
1.049
2.62
5.24
465
320
260
220
195
160
135
1- 1/4
1.380
3.45
6.9
950
660
530
460
400
325
280
1- 1/2
1.610
4.02
8.04
1460
990
810
690
620
500
430
2
2.067
5.17
10.3
2750
1900
1520
1300
1150
950
800
2- 1/2
2.469
6.16
12.3
4350
3000
2400
2050
1850
1500
1280
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
3.7.1 Gas Supply Piping by Installer
The boiler and all gas piping connections should be
pressure-tested and must be checked for leaks before
being placed into service. Test with compressed air or
inert gas if possible.
The boiler must be
disconnected at the boiler manual
shut-off valve (located at the end of the supplied gas
train) from the gas supply piping system during any
pressure testing of the system at pressures in excess of
1/2 psig (14" W.C.).
During any pressure testing of the gas supply piping
system at pressures equal to or less than 1/2 psig (14"
W.C.), the boiler should be isolated from the gas
supply piping system by closing the manual shut-off.
Some leak test solutions, including soap and water,
may cause corrosion. These solutions should be
rinsed-off with water after testing.
3.8
B
OILER
W
ATER
P
IPING
3.8.1 Piping Design
Water Flow in System
For proper water flow requirements see below.
Incorrect flow may result in eventual damage or
premature failure of the equipment.
MACH® Series 450
•
Max. Flow: 45 gpm
•
Min. Flow: 22 gpm (at max. firing rate)
MACH® Series 300
•
Max. Flow: 30 gpm
•
Min. Flow: 15 gpm (at max. firing rate)
Contact factory for minimum flow at other than
maximum firing rate.
