GOLD CGa Gas-Fired Water Boiler
26 Part Number 550-110-593/1099
Gas piping
Natural Gas:
1. Refer to Table 4 for pipe length and diameter. Base
on rated boiler input (divide by 1,000 to obtain cubic
feet per hour). Table 4 is only for gas with specific
gravity 0.60, with a pressure drop through the
gas piping of 0.30" w.c.For additional 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 if inlet pressure exceeds 13" w.c. Adjust for
13" w.c. maximum.
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 19 Gas supply piping
Table 4 Pipe capacity for 0.60 specific gravity natural gas
Gas pipe
length
(feet)
Capacity of pipe for pipe size of:
(Capacity in cubic feet gas per hour)
½" ¾" 1" 1¼" 1½"
10 132 278 520 1050 1600
20 92 190 350 730 110 0
30 73 152 285 590 860
40 63 130 245 500 760
50 56 115 215 440 670
75 45 93 175 360 545
100 38 79 150 305 460
150 31 64 120 250 380
4
59322
Manual main
shutoff gas valve
(when required)
Ground joint union
(when required)
Nipple
Tee
Cap