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Gas Piping
NATURAL GAS
Pipe Sizing - Natural Gas
1. Refer to Table 3 for pipe length and diame-
ter requirements. Based on rated PER-
FORMANCE PLUS input (divide by 1,000
to obtain cubic feet per hour).
-
Table 3 is based on Natural Gas with a
specific gravity of 0.60 and a pressure
drop through the gas piping of
0.30"w.c..
-
For additional gas piping sizing infor-
mation, refer to ANSI Z223.1. For
Canadian installations refer to B149.1
or B149.2.
Natural Gas Supply Pressure Requirements
1. Pressure required at the gas valve inlet
supply pressure port:
-
Maximum 13"w.c. at flow or no flow
conditions to the burner.
-
Minimum 5"w.c. during flow condi-
tions to the burner. Must be verified
during start up and with all gas appli-
ances operating.
Length of Pipe
in Feet
SCH 40
10
20
30
40
50
75
100
150
2. Install 100% lockup gas pressure regulator
Table 3: Gas piping sizing - Natural Gas
Capacity of Pipe in Cubic Feet of Gas Per Hour
(based on 0.60 specific gravity, 0.30" w.c. pressure drop)
1/2"
3/4"
132
278
92
190
73
152
63
130
56
115
45
93
38
79
31
64
38
in the gas supply line if inlet pressure can
exceed 13"w.c at any time. Adjust the lock-
up pressure regulator for 13"w.c maximum.
WARNING
DO NOT adjust or attempt to measure
gas valve outlet pressure. The gas valve
is factory-set for the correct outlet pres-
sure. This setting is suitable for natural
gas and propane and requires no field
adjustment. Attempts by the installer to
adjust or measure the gas valve outlet
pressure could result in damage to the
valve, causing potential severe personal
i n j u ry, death or substantial pro p e rt y
damage.
1"
1-1/4"
520
1050
350
730
285
590
245
500
215
440
175
360
150
305
120
250
1-1/2"
1600
1100
860
760
670
545
460
380
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