Connecting Gas Service - UTICA BOILERS MGB-50J 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 fi re
department.
Figure 12 - Gas Piping
MAXIMUM CAPACITY OF PIPE IN CUBIC FEET OF
GAS/HOUR
(Gas Pressure = 0.5 psig or less, Pressure Drop = 5
in. w/c)
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.

8 - CONNECTING GAS SERVICE

Table 4
Nominal Iron Pipe Size
¾" 1"
360 680
250 465
200 375
170 320
138 260
118 220
103 195
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 suffi cient
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
liquefi ed petroleum gas.
• Install fi eld sourced manual main shutoff valve, ground
joint union, and sediment trap upstream of gas valve.
See Figure 12.
Table 5
Min. Supply Pressure
Max. Supply Pressure
Manifold Pressure
Fire Hazard. Do not use matches, candles, open
fl ames, 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 fl uid, or other leak detection method
acceptable to authority having jurisdiction. Do not
use matches, candles, open fl ames, or other methods
1¼"
providing ignition source.
1400
• Correct leaks immediately and retest.
950
770
660
530
460
400
14
Natural Gas
5" w.c.
13.5" w.c.
3.5" w.c.
DANGER
!
Propane
11" w.c.
13.5" w.c.
10.5" w.c.