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3.6 Piping
3.6.1 Gas Piping Overview
Before making the gas hook-up, make sure the boiler is being supplied with the type of fuel shown on the
boiler nameplate.
The boiler shall be installed such that the gas ignition
system components are protected from water
(dripping, spraying, rain, etc.) during appliance
operation and service (circulator replacement, control
adjustment, etc.).
The boiler is factory fire-tested and adjusted for proper
combustion. The gas train components are certified to
handle a maximum inlet pressure of 14"
psig). Typical gas pressure supply for natural gas is 7"
(11"
for propane). If the available gas
W.C.
W.C.
pressure exceeds 14"
intermediate gas pressure regulator of the "lock up"
type must be provided to reduce the pressure to less
than 14"
Refer to boiler label for minimum inlet
W.C.
gas pressure.
Install a sediment trap (drip leg) and a union connection ahead of the primary manual shutoff valve on the
boiler. A gas piping schematic is shown above. Gas piping should be installed in accordance with National
Fuel Gas Code,
ANSI Z223.1
, latest edition. In the Commonwealth of Massachusetts, the gas cock must be a "T-handle
CAN/CSA-B.149.1
type."
Nominal
Internal
Iron Pipe
Diameter
Size
(Inches)
(Inches)
2
2.067
2.5
2.469
3
3.068
4
4.026
3.6.2 Gas Supply Piping for Installer
The boiler and all gas piping connections should be pressure-tested and must be checked for leaks before
being placed into service. The boiler must be disconnected at the boiler's 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 0.0723 psig (2"
During any pressure testing of the gas supply piping system at pressures equal to or less than 0.0723 psig
(2"
), the boiler must be isolated from the gas supply piping system by closing the manual shut-off.
W.C.
Some leak test solutions, including soap and water, may cause corrosion of the carbon steel gas pipe fittings.
These leak test solutions should be cleaned off after testing is complete.
W.C.
, a suitable additional
W.C.
, latest edition, and any other local codes which may apply; in Canada see
Pipe Capacity for Natural Gas
Equivalent Pipe
Length
90 o Ell
Tee
(Feet)
(Feet)
5.17
10.3
6.16
12.3
7.67
15.3
10.1
20.2
Simplified Gas Piping
(1/2
Maximum Capacity in Cubic Feet of Natural Gas Per Hour
Pressure Drop of 0.5 inch Water Column/Equivalent Length
of Pipe (in feet)
20
40
2750
-
4350
3000
7700
5300
15800
10900
). Test with compressed air or inert gas if possible.
W.C.
TM
P-K SONIC
Gas Fired Boiler
T T T T echnical Service 1.877.728.5351
echnical Service 1.877.728.5351
echnical Service 1.877.728.5351
echnical Service 1.877.728.5351
60
80
100
-
-
-
2400
-
-
4300
3700
-
8800
7500
6700
150
200
-
-
-
-
-
-
5500
4600
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