5 | EG, PEG, EGH |
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Gas piping
Connecting gas supply piping
Size gas piping considering:
a.Diameter and length of gas supplying piping.
b.Number of fittings.
c.Maximum gas consumption (including any possible future expansion).
d.Allowable loss in gas pressure from gas meter outlet to boiler. For pressure drops, see ANSI Z223.1. Canadian installations must comply with CAN/CSA B149.1 or .2 Installation Codes.
1.For natural gas:
a)Refer to following tables. To obtain cubic feet per hour, divide the input by 1000.
b)Size for rated boiler input.
c) Inlet gas pressure: | 5" W.C. minimum |
| 13" W.C. maximum |
d)Manifold gas pressure: 3¹⁄₂" W.C.
e)Install 100%
2. For propane gas:
a) Inlet gas pressure: | 11" W.C. minimum |
| 13" W.C. maximum |
b)Manifold gas pressure: 10" WC.
c)Gas pressure regulator provided by gas supplier must be adjusted for maximum pressure of 13" W.C.
d)Contact gas supplier to size pipes, tanks and regulator.
3.Remove
4.Follow good piping practices.
5.Pipe joint compound (pipe dope) must be resistant to corrosive action of liquified petroleum gases. Apply sparingly only to make threads of pipe joints.
6.Install drip leg at inlet of gas connection to boiler. Where local utility requires, extend drip leg to floor.
7.Install ground joint union when required for servicing. See Figure 22.
8.Install manual
9.Support piping by hangers, not by boiler or its accessories.
10.In Canada only, the manual main shut off valve (when used) must be identified by the installer.
11.Purge all air from piping.
12.Before placing boiler in operation, check boiler and its gas connection for leaks.
Do not check for gas leaks with an open flame - use bubble test. Failure to do so can cause severe personal injury, death or substantial property damage.
a)Close manual main
b)Disconnect boiler and gas valve from gas supply piping during any pressure test greater than 13 inches water column.
Figure 22 Gas supply piping
14 | Part Number |
