Utica Boilers MGB Series II/MGC Series Istruzione Sull'Installazione
14
8 - CONNECTING GAS SERVICE
General
• Use piping materials and joining methods acceptable
to authority having jurisdiction. In absence of such
requirements National Fuel gas Code, ANSI Z223.1/
NFPA 54
• Size and install gas piping system to provide sufficient
gas supply to meet maximum input at not less than
minimum supply pressure. See Table 4.
• 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 12.
Table 5
Natural Gas
Propane
Min. Supply Pressure
5" w.c.
11" w.c.
Max. Supply Pressure
13.5" w.c.
13.5" w.c.
Manifold Pressure
3.5" w.c.
10.5" w.c.
DANGER
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
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.
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
Length of
Pipe (Feet)
Nominal Iron Pipe Size
½”
¾”
1”
1¼”
10
175
360
680
1400
20
120
250
465
950
30
97
200
375
770
40
82
170
320
660
60
66
138
260
530
80
57
118
220
460
100
50
103
195
400
For additional information refer to the National Fuel Gas
Code Handbook.
Figure 12 - Gas Piping
CAUTION
WHAT TO DO IF YOU SMELL GAS
• Do not try to light any appliance.
• Do not touch any electrical switch; do not use
• 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.
!