Gas Supply Piping By Installer; Boiler Water Piping; Piping Design - Patterson-Kelley MACH-05 Installation Manual

MACH® Series Gas-Fired Boiler
Pipe Capacity for Natural Gas
Nominal
Iron Pipe Internal
Size Diameter
(Inches) (Inches)
1/2 0.622
3/4 0.824
1 1.049
1- 1/4 1.380
1- 1/2 1.610
2 2.067
2- 1/2 2.469
3 3.068
4 4.026

3.7.1 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.
Equivalent Pipe Length
90º Ell Tee
(Feet) (Feet)
1.55 3.1
2.06 4.12
2.62 5.24
3.45 6.9
4.02 8.04
5.17 10.3
6.16 12.3
7.67 15.3
10.1 20.2
Maximum Capacity in Cubic Feet of Natural Gas per Hour
Pressure Drop of 0.5 inch Water Column/Equivalent Length of Pipe
20 40 60
120 82 66
250 170 138
465 320 260
950 660 530
1460 990 810
2750 1900 1520
4350 3000 2400
7700 5300 4300
15800 10900 8800
3.8 B
OILER

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.
Model
1050
900
750
450
300
Contact factory for minimum flow at other than
maximum firing rate.
Page 14
(in feet)
80 100
57 50
118 103
220 195
460 400
690 620
1300 1150
2050 1850
3700 3250
7500 6700
W P
ATER IPING
Max Flow Min Flow
GPM GPM
105 52
90 45
75 37
45 22
30 15
Installation
150 200
40 35
84 72
160 135
325 280
500 430
950 800
1500 1280
2650 2280
5500 4600
DP ft. at
max flow
12
12
12
8.5
8.5