Connecting Gas Service - UTICA BOILERS UH15B Series Installation, Operation & Maintenance Manual

!
CAUTION
WHAT TO DO IF YOU SMELL GAS
• Do not try to light any appliance.
• Do not touch any electrical switch; do not use
any phone in your building.
• Immediately call your gas supplier from a
neighbor's phone. Follow gas supplier's
instructions.
• If you cannot reach your gas supplier, call the fire
department.
Figure 11 - Drip Leg
Maximum Capacity Of Pipe In Cubic Feet Of Gas/Hour
(Gas Pressure = 0.5 psig or less, Pressure Drop = 5 in.
w/c)
Table 4 - Gas Piping
Nominal Iron Pipe Size
Length of
Pipe (Feet)
½"
10 175
20 120
30 97
40 82
60 66
80 57
100 50
For additional information refer to the National Fuel Gas
Code Handbook.

9 - CONNECTING GAS SERVICE

¾" 1" 1¼"
360 680 1400
250 465 950
200 375 770
170 320 660
138 260 530
118 220 460
103 195 400
General
• Use piping materials and joining methods acceptable
to authority having jurisdiction. In absence of such
requirements:
• USA - National Fuel gas Code, ANSI Z223.1/NFPA 54
• Canada - Natural Gas and Propane Installation Code,
CAN/CSA B149.1
• Size and install gas piping system to provide sufficient
gas supply to meet maximum input at not less than
minimum supply pressure. See Table 3.
• Support piping with hooks straps, bands, brackets,
hangers, or building structure components to prevent or
dampen excessive vibrations and prevent strain on gas
connection. Boiler will not support piping weight.
• Use thread (joint) compound (pipe dope) suitable for
liquefied petroleum gas.
• Install field sourced manual main shutoff valve, ground
joint union, and sediment trap upstream of gas valve.
See Figure 11.
Table 5 - Gas Pressure
Min. Supply Pressure
Max. Supply Pressure
Manifold Pressure
!
Fire Hazard. Do not use matches, candles, open
flames, or other methods providing ignition source.
Failure to comply will result in death or serious
injury.
Leak Check Gas Piping
Pressure test boiler and gas connection before placing
boiler in operation.
• Pressure test over 1/2 psig (3.5 kPa). Disconnect
boiler and its individual gas shutoff valve from gas
supply system.
• Pressure test at 1/2 psig (3.5 kPa) or less. Isolate
boiler from gas supply system by closing manual gas
shutoff valve.
• Locate leakage using gas detector, noncorrosive
detection fluid, or other leak detection method
acceptable to authority having jurisdiction. Do not
use matches, candles, open flames, or other methods
providing ignition source.
• Correct leaks immediately and retest.
16
Natural Gas
5" w.c.
13.5" w.c. 13.5" w.c.
3.5" w.c. 10.5" w.c.
DANGER
PN 240011107, Rev. E [06/15/2018]
Propane
11" w.c.