37
Gas Input of Furnace
Heating Value of Gas BTU
hr
BTU
hr
ft
hr
required =
3
NATURAL GAS PIPE CAPACITY TABLE (CU FT/HR)
Maximum capacity of pipe in thousands of BTU/hr of natural gas
Inlet pressure: less than 2 psi
Pressure Drop: 0.3 in. W.C.
Specific Gravity: 0.60
Nominal
Iron Pipe*
Size, Inches
Length of Pipe, Feet
10
20
30
40
50
60
70
80
90
100
1/2
131
90
72
62
55
50
46
42
40
38
3/4
273
188
151
129
114 104
95
89
83
79
1.0
514
353
284
243
215 195 179 167 157
148
1-1/4
1,060
726
583
499
442 400 368 343 322
304
1-1/2
1,580
1,090
873
747
662 600 552 514 484
455
Aer the length of pipe has been determined, select the pipe size which will provide the minimum
cubic feet per hour reqired for the gas input rang of the furnace. By formula:
Cubic feet per hour required
=
Gas Input of Furnace (BTU/HR)
Heang Value of Gas (BTU/FT
3
)
The gas input of the furnace is marked on the furnace rang plate. Call your local natural gas ulity
for the heang value of the gas (BTU/FT
3
).
*Schedule 40 metallic pipe.
Reference the
Naonal Fuel Gas Code NFPA 54, ANSI Z223.1- Pipe Sizing
for more informaon.
G. GAS
G.1.5. Sealing Threaded Connections – Best Practice
Use a gas rated and approved liquid, paste, or tape thread sealant on all threaded connections. Apply
sealant to the male threads and tighten the fitting using wreches to hold both the fitting and the pipe. DO
NOT OVERTIGHTEN THE PIPE GOING INTO THE GAS VALVE, DAMAGE MAY OCCUR. Test all threaded
connections with leak test fluid or soap and water.
G.1.6. Gas Pipe Sizing and Capacity
Size the gas line to the furnace adequate enough to prevent undue pressure drop and never less than 3/4”
pipe.
See
Table G.1.6. - A
for Gas Pipe Capacity. The capacities of gas pipe of different diameters and lengths in
Cubic Ft/hr with pressure drop of 0.3 in. and specific gravity of 0.60 (natural gas) are shown in
Table G.1.6.
- A.
After determining the pipe length, select the pipe size which will provide the minimum cubic foot/hour
required for the gas input rating of the furnace.
By formula:
The gas input of the furnace is marked on the furnace rating plate. The heating value of the gas (BTU/FT3) may
be determined by consulting the local natural gas utility or the L.P. gas supplier.
Table G.1.1 - A
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