P-K SONIC
TM
Gas Fired Boiler
T
T
T
Technical Service 1.877.728.5351
echnical Service 1.877.728.5351
echnical Service 1.877.728.5351
echnical Service 1.877.728.5351
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"
W.C.
(1/2
psig). Typical gas pressure supply for natural gas is 7"
W.C.
(11"
W.C.
for propane). If the available gas
pressure exceeds 14"
W.C.
, a suitable additional
intermediate gas pressure regulator of the "lock up"
type must be provided to reduce the pressure to less
than 14"
W.C.
Refer to boiler label for minimum inlet
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, and any other local codes which may apply; in Canada see
CAN/CSA-B.149.1
, latest edition. In the Commonwealth of Massachusetts, the gas cock must be a “T-handle
type.”
Pipe Capacity for Natural Gas
Nominal
Iron Pipe
Size
(Inches)
Internal
Diameter
(Inches)
Equivalent Pipe
Length
Maximum Capacity in Cubic Feet of Natural Gas Per Hour
Pressure Drop of 0.5 inch Water Column/Equivalent Length
of Pipe (in feet)
90o Ell
(Feet)
Tee
(Feet)
20
40
60
80
100
150
200
2
2.067
5.17
10.3
2750
-
-
-
-
-
-
2.5
2.469
6.16
12.3
4350
3000
2400
-
-
-
-
3
3.068
7.67
15.3
7700
5300
4300
3700
-
-
-
4
4.026
10.1
20.2
15800
10900
8800
7500
6700
5500
4600
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"
W.C.
). Test with compressed air or inert gas if possible.
During any pressure testing of the gas supply piping system at pressures equal to or less than 0.0723 psig
(2"
W.C.
), the boiler must 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 of the carbon steel gas pipe fittings.
These leak test solutions should be cleaned off after testing is complete.
Simplified Gas Piping
