TABLE 8
NATURAL GAS PIPE CAPACITY TABLE (CU. FT./HR.)
Capacity of gas pipe of different diameters and lengths in cu. ft. per hr. with pressure drop of 0.3 in. and
specific gravity of 0.60 (natural gas).
Nominal
Length of Pipe, Feet
Iron Pipe
Size, Inches
10
20
30
40
50
60
70
80
1/2
132
92
73
63
56
50
46
43
3/4
278
190
152
130
115
105
96
90
1
520
350
285
245
215
195
180
170
1-1/4
1,050
730
590
500
440
400
370
350
1-1/2
1,600
1,100
890
760
670
610
560
530
After the length of pipe has been determined, select the pipe size which will provide the minimum cubic
feet per hour required for the gas input rating of the furnace. By formula:
Gas Input of Furnace (BTU/HR)
Cu. Ft. Per Hr. Required = Heating Value of Gas (BTU/FT
3
)
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 LP gas supplier.
TABLE 9
LP GAS PIPE CAPACITY TABLE (CU. FT./HR.)
Maximum capacity of pipe in thousands of BTU per hour of undiluted liquefied petroleum gases (at 11
inches water column inlet pressure).
(Based on a Pressure Drop of 0.5 Inch Water Column)
Nominal
Length of Pipe, Feet
Iron Pipe
Size, Inches
10
20
30
40
50
60
70
80
90
100
125
150
1/2
275
189
152
129
114
103
96
89
83
78
69
63
3/4
567
393
315
267
237
217
196
182
173
162
146
132
1
1,071
732
590
504
448
409
378
346
322
307
275
252
1-1/4
2,205 1,496 1,212 1,039
913
834
771
724
677
630
567
511
1-1/2
3,307 2,299 1,858 1,559 1,417 1,275 1,181 1,086 1,023
976
866
787
2
6,221 4,331 3,465 2,992 2,646 2,394 2,205 2,047 1,921 1,811 1,606 1,496
Example (LP): Input BTU requirement of unit, 150,000
Equivalent length of pipe, 60 ft. = 3/4" IPS required.
LP COPPER TUBE SIZING TABLE
Sizing between single or second stage (low pressure) regulator and appliance. Maximum capacity of pipe in thousands of BTU
per hour of undiluted propane gases (at 11" w.c. setting).
Outside Diameter
Length of Pipe, Feet
Copper Tubing,
Type L
10
20
30
40
50
60
80
100
125
150
3/8"
49
34
27
23
20
19
16
14
11
10
1/2"
110
76
61
52
46
42
36
32
28
26
5/8"
206
141
114
97
86
78
67
59
52
48
3/4"
348
239
192
164
146
132
113
100
89
80
7/8"
536
368
296
253
224
203
174
154
137
124
41
Summary of Contents for RGFE
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