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Gas Piping
Pipe Sizing Procedure - Example
The gas supply must be capable of handling the entire gas load at the location. Gas line sizing is based on gas
type, the pressure drop in the system, the gas pressure supplied, and gas line type. For gas pipe sizing in the
United States, refer to the National Fuel Gas Code, NFPA 54. For Canadian gas pipe sizing, refer to the Natural
Gas and Propane Installation Code CAN/CSA B149.1. The below information is provided as an example. The
appropriate table from the applicable code must be used.
1.For some tables, you will need to determine the cubic feet per hour of gas required by dividing the gas input by
the heating value of the gas (available from the local gas company). The gas input needs to include all gas
products at the location and the maximum BTU usage at full load when all gas products are in use.
Cubic Feet per Hour (CFH) =
2.Use the table for your gas type and pipe type to find the pipe size required. The pipe size must be able to
provide the required cubic feet per hour of gas or the required BTU/hour.
Example: The gas input of the R94LSe is 199,000 BTU/HR using propane. Additional appliances at the location
require 75,000 BTU/hr. Therefore the maximum BTU usage will be 274,000 BTU/hr.
If using propane gas with Schedule 40 metallic pipe, 100 ft in length, then the 1 inch pipe size will be
capable of supplying 372,000 BTU/hr of propane gas..
Pipe Sizing Table - Natural Gas
Schedule 40 Metallic Pipe
Inlet Pressure:
less than 2 psi (55 inches W.C.)
Pressure Drop: 0.3 inches W.C.
Specific Gravity: 0.60
cubic feet per hour
Length
3/4
10
273
20
188
30
151
40
129
50
114
60
104
70
95
80
89
90
83
100
79
125
70
150
63
175
58
200
54
20
Gas Input of all gas products (BTU / HR)
Pipe Size (inches)
1
1 1/4
514
1060
353
726
284
583
243
499
215
442
195
400
179
368
167
343
157
322
148
304
131
269
119
244
109
224
102
209
VB Series Outdoor LS Manual
Heating Value of Gas (BTU / FT
Pipe Sizing Table - Propane Gas
Inlet Pressure:
Pressure Drop: 0.5 inches W.C.
Specific Gravity: 1.50
Capacity in Thousands of BTU per Hour
Length
1 1/2
1580
10
1090
20
873
30
747
40
662
50
600
60
552
80
514
100
482
125
455
150
403
175
366
200
336
313
3
)
Schedule 40 Metallic Pipe
11.0 inches W.C.
Pipe Size (inches)
1/2
3/4
291
608
1150
200
418
160
336
137
287
122
255
110
231
101
212
94
197
89
185
84
175
74
155
67
140
1
1 1/4
2350
787
1620
632
1300
541
1110
480
985
434
892
400
821
372
763
349
716
330
677
292
600
265
543
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