Piping; Gas Piping Overview - Patterson-Kelley P-K STORM ST-8000 Installation And Owner's Manual

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.
ST-2500
Natural Gas 3.5" W.C
Note: It is recommended that for modulating appliance systems, vented regulators designed for the
reflective rapid turndown be utilized
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.
This unit comes with a sediment trap (drip leg) already installed. Patterson-Kelley recommends 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."
Revised: February 2, 2024
Released: February 2, 2024
ST-3000 ST-3500
3.5" W.C. 3.5" W.C.
Appliance Size (BTU/Hr)
2,500,000
3,000,000
3,500,000
4,000,000
4,999,999
6,000,000
8,000,000
 Patterson-Kelley 2024
All Rights Reserved.
P-K Storm
Technical Service 1.877.728.5351
Simplified Gas Piping
ST-4000 ST-5000
3.5" W.C. 3.5" W.C.
Natural Gas Requirement
(CFH)
2500
3000
3500
4000
5000
6000
8000
2691000403 P-K Storm ST2500-ST8000
Installation and Owners Manual Rev G.docx
®
Gas Fired Boiler
ST-6000 ST-8000
3.5" W.C. 3.5" W.C.
Page 48