Absolute ABS-1500 - Gas Line Piping to Boiler; Gas Pressures

Absolute Boilers ABS 1500-2000-2500-3000-4000
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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 ttings. 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
Iron
Pipe
Size
(inche)
Internal
Diameter
(Inches)
Equivalent
Length
Maximum Capacity in Cubic Feet of Natural Gas per Hour
Pressure Drop of 0.5 inch Water Column/Equivalent of Pipe (in feet)
90°
(feet)
Tee
(feet)
20 40 60 80 100 150 200
1/2 0.622 1.55 3.1 120 85 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 14600 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 3.088 7.67 15.3 7700 5300 4300 3700 3250 2650 2280
4 4.026 10.1 20.2 15000 10900 8800 8800 6700 5500 4600
6.2 Gas pressures
The boiler has been factory test red and adjusted for proper combustion. The boilers main gas valve are certied 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 lter 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 ring on max output).
WARNING
All threaded connections must be made using a pipe compound that is resistant to the action of liqueed petroleum
gases. Use only approved gas line type pipe sealant
Gas system pressure checks:
- The boiler main gas supply shuto 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 shuto valve and piping must be isolated by closing the main gas shuto 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