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6.1.3 Gas line piping to boiler
Ensure pipe sizing capability follows the recommend values based on an overall length of pipe from the meter plus the
equivalent length of all fittings. Approximate sizing may be based on 1 cubic foot of natural gas supply per 1,000 BTU/
hour input. For example, a 1,000,000 BTU input boiler would require 1000 cubic feet of natural gas.
Nominal
Internal
Iron
Pipe
Diameter
Size
(Inches)
(inche)
(feet)
1/2
0.622
1.55
3/4
0.824
2.06
1
1.049
2.62
1-1/4
1.380
3.45
1-1/2
1.610
4.02
2
2.067
5.17
2-1/2
2.469
6.16
3
3.088
7.67
4
4.026
10.1
6.2 Gas pressures
The boiler has been factory test fired and adjusted for proper combustion. The boilers main gas valve are certified and
can accept a maximum inlet pressure up to ½ psi or 14 "w.c. [35 mbar], but MUST provided with a min. of 3.5 "w.c.
[8 mbar] at the gas filter inlet test point when the boiler is operating at max output. Pressures below this level can
result in lockouts (for multi gas appliance installations this minimum pressure must be available at each boiler with all
gas appliances firing on max output).
WARNING
All threaded connections must be made using a pipe compound that is resistant to the action of liquefied petroleum
gases. Use only approved gas line type pipe sealant
Gas system pressure checks:
-
The boiler main gas supply shutoff valve and piping must be isolated from any gas piping pressure testing in excess
of ½ psi or 14 "w.c. [35 mbar]
-
The boiler main gas shutoff valve and piping must be isolated by closing the main gas shutoff valve during gas
piping pressure testing less than ½ psi [3.5 kPa]
-
The boiler main gas piping and gas train must be leak tested prior to placing the boiler in operation
Equivalent
Length
Pressure Drop of 0.5 inch Water Column/Equivalent of Pipe (in feet)
Tee
90°
20
(feet)
3.1
120
4.12
250
5.24
465
6.9
950
8.04
14600
10.3
2750
12.3
4350
15.3
7700
20.2
15000
Absolute Boilers ABS 1500-2000-2500-3000-4000
Maximum Capacity in Cubic Feet of Natural Gas per Hour
40
60
85
66
170
138
320
260
660
530
990
810
1900
1520
3000
2400
5300
4300
10900
8800
51
80
100
150
57
50
40
118
103
84
220
195
160
460
400
325
690
620
500
1300
1150
950
2050
1850
1500
3700
3250
2650
8800
6700
5500
200
35
72
135
280
430
800
1280
2280
4600
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