35
GAS INFORMATION
Table 8. Gas Flow Rates
GAS FLOW RATES (CUBIC FEET PER HOUR)
TIME FOR
ONE REVOLUTION
(SECONDS)
CUBIC FEET PER REVOLUTION
OF GAS METER
TIME FOR
ONE REVOLUTION
(SECONDS)
CUBIC FEET PER REVOLUTION
OF GAS METER
1
5
10
1
5
10
10
360
1,800
3,600
66
55
273
545
12
300
1,500
3,000
68
53
265
529
14
257
12,86
2,571
70
51
257
514
16
225
1,125
2,250
72
50
250
500
18
200
1,000
2,000
74
49
243
486
20
180
900
1,800
76
47
237
474
22
164
818
1,636
78
46
231
462
24
150
750
1,500
80
45
225
450
26
138
692
1,385
82
44
220
439
28
129
643
1,286
84
43
214
429
30
120
600
1,200
86
42
209
419
32
113
563
1,125
88
41
205
409
34
106
529
1,059
90
40
200
400
36
100
500
1,000
92
39
196
391
38
95
474
947
94
38
191
383
40
90
450
900
96
38
188
375
42
86
429
857
98
37
184
367
44
82
409
818
100
36
180
360
46
78
391
783
102
35
176
353
48
75
375
750
104
35
173
346
50
72
360
720
106
34
170
340
52
69
346
692
108
33
167
333
54
67
333
667
110
33
164
327
56
64
321
643
112
32
161
321
58
62
310
621
114
32
158
316
60
60
300
600
116
31
155
310
62
58
290
581
118
31
153
305
64
56
281
563
120
30
150
300
CAPACITY OF BLACK IRON GAS PIPE (CU. FT. PER HOUR)
FOR NATURAL GAS (SPECIFIC GRAVITY - 0.60)
NOMINAL BLACK
IRON PIPE
DIAMETER (IN.)
LENGTH OF PIPE RUN (FT)
10
20
30
40
50
60
70
80
½
130
90
75
65
55
50
45
40
¾
280
190
150
130
115
105
95
90
1
520
350
285
245
215
195
180
170
1
¼
1,050
730
590
500
440
400
370
350
1
½
1,600
1,100
890
760
670
610
NOTES
The cubic feet per hour listed in the table above must be greater than the cubic feet per hour of gas fl ow required by the
furnace. To determine the cubic feet per hour of gas fl ow required by the furnace, divide the input rate of the furnace by the
heating value (from gas supplier) of the gas.
Cubic Feet Per Hour Required =
Input To Furnace (Btu/hr)
Heating Value of Gas (Btu/Cu. Ft.)
Table 9. Black Iron Gas Pipe Capacities
