Gas Piping - Weil-McLain GOLD CGt Manual

GOLD CGt Gas-Fired Water Boiler — Boiler Manual
5

Gas piping

Connecting gas supply piping to boiler
1. Remove jacket front panel and refer to
a. at inlet of gas connection to boiler. Where local
Install drip leg
utility requires drip leg to be extended to the floor, use appropriate
length of pipe between cap and tee.
b.
Install ground joint union
c.
Install manual shutoff valve
jacket when required by local codes or utility requirements.
d. — When using manual main shutoff valve, it
In Canada
by the installer.
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,
.
for leaks
a.
Close manual main shutoff valve
less than 13" w.c.
b.
Disconnect boiler and gas valve from gas supply piping
any pressure testing greater than 13" w.c.
Do not check for gas leaks with an open flame
bubble test. Failure to use bubble test or check for gas
leaks can cause severe personal injury, death or
substantial property damage.
5.
Use pipe dope compatible with propane gases.
to male threads of pipe joints so that pipe dope does not block gas
flow.
Failure to apply pipe dope
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"
10 132
20 92
30 73
40 63
50 56
75 45
100 38
150 31
28
to pipe gas to boiler.
Figure 24
for servicing, when required.
in gas supply piping outside boiler
check boiler and its gas connection
during any pressure testing at
Apply sparingly only
as detailed above can result
¾" 1" 1¼"
278 520 1050
190 350 730
152 285 590
130 245 500
115 215 440
93 175 360
79 150 305
64 120 250
Figure 24 Gas supply piping
Manual main shutoff
gas valve (when required)
Ground joint union
(when required)
Tee
must be
Nipple
Cap
during
071028
— use
Sizing gas supply piping
1. Refer to
Table 7
on rated boiler input (divide by 1,000 to obtain
cubic feet per hour).
specific gravity 0.60, with a pressure drop
through the gas piping of 0.30" w.c.
gas pipe sizing information, refer to ANSI Z223.1
(or B149.1 or B149.2 for Canadian installations).
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
Adjust for 13" w.c. maximum.
1½"
1600
1100
860
760
670
545
460
380
Top entrance
option
Side entrance
option
for pipe length and diameter. Base
is only for gas with
Table 7
For additional
if inlet pressure exceeds 13" w.c.
Part Number 550-110-290/0501