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Gas piping — sizing gas lines
&IGURE Pipe capacity for 0.60 specific gravity
natural gas; pipe length is in equivalent
feet
Gas
PIPE
total
LENGTH
FEET
#APACITY
Cubic feet per hour, natural gas, 0.60 specific gravity
Gas pressure 13” (330 mm) w.c. or less
Pressure drop 0.3 inches (7.6 mm) w.c.
v Ðv v v v v v
10 132 278 520 1050 1600 3050 4800
20 92 190 350 730 1100 2100 3300
30 73 152 285 590 890 1650 2700
40 NA 130 245 500 760 1450 2300
50 NA 115 215 440 670 1270 2000
75 NA 105 175 360 545 1020 1650
100 NA 96 150 305 460 870 1400
150 NA 90 120 250 380 710 1130
&IGURE Equivalent lengths of straight pipe for
typical gas line fittings
0IPESIZE
inches
%QUIVALENTLENGTHFEET
%LBOW Tee
SHORT
radius
LONG
radius
line
mOW
BRANCH
mOW
½
3.6 2.2 1.7 4.2
¾
4.4 2.3 2.4 5.3
1
5.2 2.7 3.2 6.6
1¼
6.6 3.2 4.6 8.7
1½
7.4 3.4 5.6 9.9
2
8.5 3.6 7.7 12.0
2½
9.3 4.0 9.3 13.0
Boiler gas connection is ½” NPT. Size gas lines large
enough to provide gas to all connected appliances.
Natural Gas:
0IPESIZINGFORNATURALGAS
1. Size gas piping from meter outlet to entrance of boiler in accor-
dance with Figure 16 and Figure 17.
2. Use total input of all connected appliances. Divide total input in
Btuh by 1,000 to obtain cubic feet per hour of natural gas.
a. Pipe lengths in Figure 16 are equivalent length of straight
pipe. Convert pipe fittings to equivalent lengths using data
from Figure 17.
b. Figure 16 is only for natural gas with specific gravity 0.60, with
a pressure drop through the gas piping as listed in the table.
c. For additional gas pipe sizing information, refer to ANSI Z223.1
(or B149.1 or B149.2 for Canadian installations).
.ATURALGASSUPPLYPRESSURE
1. Pressure required at gas valve inlet pressure port:
a. Maximum: 13” (330 mm) w.c. with no flow (lockup).
b. Minimum gas pressure, with gas flowing (verify during
boiler startup, while boiler is at high fire):
ECO 70: 3½” (89 mm) w.c.
ECO 110: 4½” (114 mm) w.c.
ECO 155: 3½” (89 mm) w.c.
c. Nominal gas pressure: 7.0” (178 mm) w.c.
2. Install 100% lockup gas pressure regulator in supply line if inlet
pressure can exceed 13” w.c. at any time. Adjust lockup regulator
for 13” w.c. maximum.
Propane Gas:
You must follow the instructions, beginning on page 13,
to operate the boiler on propane. Failure to comply could
result in severe personal injury, death or substantial
property damage.
0IPESIZINGFORPROPANEGAS
1. Contact gas supplier to size pipes, tanks and 100% lockup gas
pressure regulator.
0ROPANESUPPLYPRESSURE
1. Adjust propane supply regulator provided by gas supplier for 13”
(330 mm) w.c. maximum pressure.
2. Pressure required at gas valve inlet pressure port:
a. Maximum: 13” (330 mm) w.c. with no flow (lockup).
b. Minimum gas pressure, with gas flowing (verify during
boiler startup, while boiler is at high fire):
ECO 70: 3½” (89 mm) w.c.
ECO 110: 4½” (114 mm) w.c.
ECO 155: 3½” (89 mm) w.c.
c. Nominal gas pressure: 11.0” (279 mm) w.c.
Part number 550-142-122/0513
17
TM
GAS-FIRED WATER BOILER — Boiler Manual
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