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3.7 Piping
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. 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 the table below or the
appliance's label for the minimum inlet gas pressure.
Natural Gas
Note: When using a vented lock-up gas pressure regulator, the vent piping should be increased by
one pipe size for every 10 equivalent feet of length. Never connect vent piping that is smaller in size
than the gas regulator's vent port connection.
Install a sediment trap (drip leg) and a union connection ahead of the primary manual shutoff valve on
the boiler. Patterson-Kelley recommends installing this drip leg a minimum of 12" from the back of 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."
Revised: October 2, 2019
Released: October 2, 2019
ST-1250
3.5" W.C
Appliance Size (BTU/Hr)
1,250,000
1,500,000
1,750,000
2,000,000
Patterson-Kelley 2019
All Rights Reserved.
Technical Service 1.877.728.5351
Simplified Gas Piping
ST-1500
ST-1750
3.5" W.C.
3.5" W.C.
Natural Gas Requirement
(CFH)
1250
1500
1750
2000
2691000099 P-K Storm Installation and Owners
P-K Storm
TM
Gas Fired Boiler
ST-2000
3.5" W.C.
Manual.docx
Page 37
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