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Maximum delivery Capacity in Cubic Feet of Gas per Hour (based on IPS Pipe carrying Natural Gas with 0.60 Specific
Gravity with a Pressure Drop of 0.5" W.C.).
Based on Energy Content of 1,000 BTU/Cubic ft: The water heater requires 120 Cubic ft/hr for the 140 model.
The following tables are from NFPA 54.
Pipe Size
10'
20'
Diameter
(3 .0 m)
(6.1 m)
(9.1 m)
1/2"
172
118
(13 mm)
3/4"
360
247
(19 mm)
1"
678
466
(25mm)
1
1/4"
1,390
957
(32mm)
1
1/2"
2,090
1,430
1,150
(38mm)
2"
4,020
2,760
2,220
(51mm)
Maximum Capacity of Propane (LP) Based on 11" W.C. supply pressure at a 0.5" W.C. pressure drop
Pipe Size
10'
20'
Diameter
(3 .0 m)
(6.1 m)
(9.1 m)
1/2"
268
184
(13 mm)
3/4"
567
393
(19 mm)
1"
1,071
732
(25mm)
1
1/4"
2,205
1,496
1,212
(32mm)
1
1/2"
3,307
2,299
1,858
(38mm)
2"
6,221
4,331
3,465
(51mm)
Gas sizing example
(Natural Gas)
Gas meter
Based on Energy Content of 1,000 BTU/Cubic ft:
Divide each appliance's BTU/h requirement by 1,000 BTU/ft
Take into account the distance the appliance is from the gas meter, look in the above gas chart to properly size the line.
For sections of the gas line supplying gas to more than one appliance (Ex: Point A to Point B), add up the cubic ft per hour
requirements of the appliances that are being supplied by that section, and size to the farthest appliance.
For Example: The section from A to B supplies gas to the furnace, range and dryer. Adding up the BTU/h requirements and
dividing by 1,000 yields a cubic ft per hour requirement of 220 cubic ft of gas per hour. The farthest appliance is the range, which
is 50 ft away from the meter. Looking at the above chart, and under the column of 50 ft, Section A to B needs to be 1" in order
to supply 220 cubic ft.
-Natural gas supply piping-
30'
40'
50'
60'
(12.2 m)
(15.2 m)
(18.3 m)
95
81
72
65
199
170
151
137
374
320
284
257
768
657
583
528
985
873
791
1,900
1,680
1,520
-Propane (LP) supply piping-
30'
40'
50'
60'
(12.2 m)
(15.2 m)
(18.3 m)
148
126
112
101
315
267
237
217
590
504
448
409
1,039
913
834
1,559
1,417
1,275
2,992
2,646
2,394
Water
heater
120,000 BTU/h
10' Length
1/2" Pipe size
10' Length
1-1/4" Pipe size
A
10' Length
1" Pipe size
to get the appliance's ft
3
29
Length
70'
80'
90'
100'
(21.3 m)
(24.4 m)
(27.4 m)
(30.5 m)
60
56
52
50
126
117
110
104
237
220
207
195
486
452
424
400
728
677
635
600
1,400
1,300
1,220
1,160
Length
70'
80'
90'
100'
(21.3 m)
(24.4 m)
(27.4 m)
(30.5 m)
93
87
82
77
196
185
173
162
378
346
322
307
771
724
677
630
1,181
1,086
1,023
976
2,205
2,047
1,921
1,811
35,000 BTU/h
15' Length
B
1" Pipe size
10' Length
3/4" Pipe size
Furnace
65,000 BTU/h
120,000 BTU/h
/h requirement.
3
Page
Installation Manual
Installation
Unit: Cubic feet per hour
125'
150'
200'
(38.1 m)
(45.7 m)
(61.0 m)
44
40
34
92
83
71
173
157
134
355
322
275
532
482
412
1,020
928
794
Unit: kBTU per hour
125'
150'
200'
(38.1 m)
(45.7 m)
(61.0 m)
68
62
53
146
132
112
275
252
213
567
511
440
866
787
675
1,606
1,496
1,260
Dryer
10' Length
1/2" Pipe size
15' Length
1/2" Pipe size
C
Range
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