Connecting Gas Service - UTICA BOILERS MGB50 Installation, Operation & Maintenance Manual

WHAT TO DO IF YOU SMELL GAS
• Do not try to light any appliance.
• Do not touch any electrical switch; do not
use any phones 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 14 - 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)
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.

connectIng gas serVIce

CAUTION
Table 4
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:
• 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 5.
• 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 14.
Table 5
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.
1¼"
1400
• Locate leakage using gas detector, noncorrosive
detection fluid, or other leak detection method
950
acceptable to authority having jurisdiction. Do not
770
use matches, candles, open flames, or other methods
660
providing ignition source.
530
• Correct leaks immediately and retest.
460
400
13
Natural Gas Propane
5" w.c. 11" w.c.
13.5" w.c. 13.5" w.c.
3.5" w.c. 10.5" w.c.
DANGER