Gas Piping - Weil-McLain CGi 4 Series Manual

CGi
SERIES 4 — GAS-FIRED WATER BOILER —
5

Gas piping

Connecting gas supply piping to
boiler
1. Remove jacket front panel and refer to
to boiler.
a. at inlet of gas connection to boiler.
Install drip leg
Where local utility requires drip leg to be extended to
the floor, use appropriate length of pipe between cap
and tee.
b.
Install ground joint union
quired.
c.
Install manual shutoff valve
side boiler jacket when required by local codes or utility
requirements.
d. — When using manual main shutoff valve, it
In Canada
by the installer.
must be identified
2. with hangers, not by boiler or its accessories.
Support piping
3. from gas supply piping.
Purge all air
4. Before placing boiler in operation,
.
connection for leaks
a.
Close manual main shutoff valve
testing at less than 13" w.c.
b.
Disconnect boiler and gas valve from gas supply
during any pressure testing greater than 13" w.c.
piping
Do not check for gas leaks with an open
— use bubble test. Failure to use bubble
flame
test or check for gas leaks can cause severe
personal injury, death or substantial property
damage.
5.
Use pipe dope compatible with propane gases.
sparingly only to male threads of pipe joints so that pipe dope
does not block gas flow.
Failure to apply pipe dope
can result in severe personal injury, death or
substantial property damage.
Table 7 Pipe capacity for 0.60 specific gravity natural gas
Capacity of pipe for pipe size of:
Gas pipe
(Capacity in cubic feet gas per hour)
length
(feet)
½" ¾"
10 132 278
20 92 190
30 73 152
40 63 130
50 56 115
75 45 93
100 38 79
150 31 64
30
to pipe gas
Figure 26
for servicing, when re-
in gas supply piping out-
check boiler and its gas
during any pressure
Apply
as detailed above
1" 1¼" 1½"
520 1050 1600
350 730 1100
285 590 860
245 500 760
215 440 670
175 360 545
150 305 460
120 250 380
Boiler Manual
Natural Gas:
1. Refer to for pipe length and diameter. Base on rated
Table 7
boiler input (divide by 1,000 to obtain cubic feet per hour).
is only for gas with
Table 7
pressure drop through the gas piping of 0.30" w.c.
additional gas pipe sizing information, refer to ANSI Z223.1/
NFPA 54 – latest edition (or B149.1 or B149.2 for Canadian
Natural Gas and Propane Installation Code).
2. Inlet pressure required at gas valve inlet:
• Maximum: 13" w.c.
• Minimum: 5" w.c.
• Manifold gas pressure: 3.5" w.c.
3. Install 100% lockup gas pressure regulator in supply line
inlet pressure exceeds 13" w.c.
mum.
Propane Gas:
1. Contact gas supplier to size pipes, tanks and 100% lockup
gas pressure regulator.
2. Adjust propane supply regulator provided by gas supplier for
13" w.c. maximum pressure.
3. Inlet pressure required at gas valve inlet:
• Maximum: 13" w.c.
• Minimum: 11" w.c.
• Manifold gas pressure: 10" w.c.
Figure 26 Gas supply piping
specific gravity 0.60, with a
Adjust for 13" w.c. maxi-
Part Number 550-142-302/0520
For
if