GroundRules
N.Y.C. Admin. Code § FGC 402: Section FGC 402: Pipe Sizing
Where this section sits in the code
- New York City Administrative Code
- Title 28
- Chapter 9: New York City Fuel Gas Code
402.1 General considerations.
Piping systems shall be of such size and so installed as to provide a supply of gas sufficient to meet the maximum demand and supply gas to each appliance inlet at not less than the minimum supply pressure required by the appliance.
402.2 Maximum gas demand.
The volumetric flow rate of gas to be provided shall be the sum of the maximum input of the appliances served.
The total connected hourly load shall be used as the basis for pipe sizing, assuming that all appliances could be operating at full capacity simultaneously. Where a diversity of load can be established, pipe sizing shall be permitted to be based on such loads.
The volumetric flow rate of gas to be provided shall be adjusted for altitude where the installation is above 2,000 feet (610 m) in elevation.
402.3 Sizing.
Gas piping shall be sized in accordance with one of the following:
1. Pipe sizing tables or sizing equations in accordance with Section 402.4.
2. The sizing tables included in a listed piping system's manufacturer's instructions.
3. Other approved engineering methods.
4. Individual outlets to gas ranges shall not be less than 3/4 inches (19.1 mm) NPS.
402.4 Sizing tables and equations.
Where Tables 402.4(1) through 402.4(7) are used to size piping or tubing, the pipe length shall be determined in accordance with Section 402.4.1, 402.4.2 or 402.4.3. Where Equations 4-1 and 4-2 are used to size piping or tubing, the pipe or tubing shall have smooth inside walls and the pipe length shall be determined in accordance with Section 402.4.1, 402.4.2 or 402.4.3.
1. Low-pressure gas equation (Less than 1 1/2 pounds per square inch (psi) (10.3 kPa)):
(Equation 4-1)
2. High-pressure gas equation (1 1/2 psi (10.3 kPa) and above):
(Equation 4-2)
where:
D
=
Inside diameter of pipe, inches (mm).
Q
=
Input rate appliance(s), cubic feet per hour at 60°F (15.6 °C) and 30-inch mercury column.
P
1
=
Upstream pressure, psia (P
1
+ 14.7).
P
2
=
Downstream pressure, psia (P
2
+ 14.7).
L
=
Equivalent length of pipe, feet.
D
H
=
Pressure drop, inch water column (27.7 inch water column = 1 psi).
Table 402.4 C
r
and Y Values for Natural Gas at Standard Conditions
Gas
Equation Factors
C
r
Y
Natural gas
0.6094
0.9992
For SI: 1 cubic foot = 0.028 m
3
, 1 foot = 305 mm, 1-inch water column = 0.2488 kPa, 1 pound per square inch = 6.895 kPa, 1 British thermal unit per hour = 0.293 W.
Table 402.4(1) Schedule 40 Metallic Pipe
Gas
Natural
Inlet Pressure
Less than 2 psi
Pressure Drop
.3 in. w.c.
Specific Gravity
0.60
Pipe Size (inch)
Nominal
1/2
3/4
1
1 1/4
1 1/2
2
2 1/2
3
4
5
6
8
10
12
Actual ID
0.622
0.824
1.049
1.380
1.610
2.067
2.469
3.068
4.026
5.047
6.065
7.981
10.020
11.938
Length (ft)
Capacity in Cubic Feet of Gas Per Hour
10
131
273
514
1,060
1,580
3,050
4,860
8,580
17,500
31,700
51,300
105,000
191,000
303,000
20
90
188
353
726
1,090
2,090
3,340
5,900
12,000
21,800
35,300
72,400
132,000
208,000
30
72
151
284
583
873
1,680
2,680
4,740
9,660
17,500
28,300
58,200
106,000
167,000
40
62
129
243
499
747
1,440
2,290
4,050
8,270
15,000
24,200
49,800
90,400
143,000
50
55
114
215
442
662
1,280
2,030
3,590
7,330
13,300
21,500
44,100
80,100
127,000
60
50
104
195
400
600
1,160
1,840
3,260
6,640
12,000
19,500
40,000
72,600
115,000
70
46
95
179
368
552
1,060
1,690
3,000
6,110
11,100
17,900
36,800
66,800
106,000
80
42
89
167
343
514
989
1,580
2,790
5,680
10,300
16,700
34,200
62,100
98,400
90
40
83
157
322
482
928
1,480
2,610
5,330
9,650
15,600
32,100
58,300
92,300
100
38
79
148
304
455
877
1,400
2,470
5,040
9,110
14,800
30,300
55,100
87,200
125
33
70
131
269
403
777
1,240
2,190
4,460
8,080
13,100
26,900
48,800
77,300
150
30
63
119
244
366
704
1,120
1,980
4,050
7,320
11,900
24,300
44,200
70,000
175
28
58
109
224
336
648
1,030
1,820
3,720
6,730
10,900
22,400
40,700
64,400
200
26
54
102
209
313
602
960
1,700
3,460
6,260
10,100
20,800
37,900
59,900
250
23
48
90
185
277
534
851
1,500
3,070
5,550
8,990
18,500
33,500
53,100
300
21
43
82
168
251
484
771
1,360
2,780
5,030
8,150
16,700
30,400
48,100
350
19
40
75
154
231
445
709
1,250
2,560
4,630
7,490
15,400
28,000
44,300
400
18
37
70
143
215
414
660
1,170
2,380
4,310
6,970
14,300
26,000
41,200
450
17
35
66
135
202
389
619
1,090
2,230
4,040
6,540
13,400
24,400
38,600
500
16
33
62
127
191
367
585
1,030
2,110
3,820
6,180
12,700
23,100
36,500
550
15
31
59
121
181
349
556
982
2,000
3,620
5,870
12,100
21,900
34,700
600
14
30
56
115
173
333
530
937
1,910
3,460
5,600
11,500
20,900
33,100
650
14
29
54
110
165
318
508
897
1,830
3,310
5,360
11,000
20,000
31,700
700
13
27
52
106
159
306
488
862
1,760
3,180
5,150
10,600
19,200
30,400
750
13
26
50
102
153
295
470
830
1,690
3,060
4,960
10,200
18,500
29,300
800
12
26
48
99
148
285
454
802
1,640
2,960
4,790
9,840
17,900
28,300
850
12
25
46
95
143
275
439
776
1,580
2,860
4,640
9,530
17,300
27,400
900
11
24
45
93
139
267
426
752
1,530
2,780
4,500
9,240
16,800
26,600
950
11
23
44
90
135
259
413
731
1,490
2,700
4,370
8,970
16,300
25,800
1,000
11
23
43
87
131
252
402
711
1,450
2,620
4,250
8,720
15,800
25,100
1,100
10
21
40
83
124
240
382
675
1,380
2,490
4,030
8,290
15,100
23,800
1,200
NA
20
39
79
119
229
364
644
1,310
2,380
3,850
7,910
14,400
22,700
1,300
NA
20
37
76
114
219
349
617
1,260
2,280
3,680
7,570
13,700
21,800
1,400
NA
19
35
73
109
210
335
592
1,210
2,190
3,540
7,270
13,200
20,900
1,500
NA
18
34
70
105
203
323
571
1,160
2,110
3,410
7,010
12,700
20,100
1,600
NA
18
33
68
102
196
312
551
1,120
2,030
3,290
6,770
12,300
19,500
1,700
NA
17
32
66
98
189
302
533
1,090
1,970
3,190
6,550
11,900
18,800
1,800
NA
16
31
64
95
184
293
517
1,050
1,910
3,090
6,350
11,500
18,300
1,900
NA
16
30
62
93
178
284
502
1,020
1,850
3,000
6,170
11,200
17,700
2,000
NA
16
29
60
90
173
276
488
1,000
1,800
2,920
6,000
10,900
17,200
For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per square inch = 6.895 kPa, 1-inch water column = 0.2488 kPa, 1 British thermal unit per hour = 0.293 1 W, 1 cubic foot per hour = 0.0283 m
3
/h, 1 degree = 0.0 1745 rad.
Notes:
1. NA means a flow of less than 10 cfh.
2. All table entries have been rounded to three significant digits.
Table 402.4(2) Schedule 40 Metallic Pipe
Gas
Natural
Inlet Pressure
Less than 2 psi
Pressure Drop
0.5 in. w.c.
Specific Gravity
0.60
Pipe Size (inch)
Nominal
1/2
3/4
1
1 1/4
1 1/2
2
2 1/2
3
4
5
6
8
10
12
Actual ID
0.622
0.824
1.049
1.380
1.610
2.067
2.469
3.068
4.026
5.047
6.065
7.981
10.020
11.938
Length (ft)
Capacity in Cubic Feet of Gas Per Hour
10
172
360
678
1,390
2,090
4,020
6,400
11,300
23,100
41,800
67,600
139,000
252,000
399,000
20
118
247
466
957
1,430
2,760
4,400
7,780
15,900
28,700
46,500
95,500
173,000
275,000
30
95
199
374
768
1,150
2,220
3,530
6,250
12,700
23,000
37,300
76,700
139,000
220,000
40
81
170
320
657
985
1,900
3,020
5,350
10,900
19,700
31,900
65,600
119,000
189,000
50
72
151
284
583
873
1,680
2,680
4,740
9,660
17,500
28,300
58,200
106,000
167,000
60
65
137
257
528
791
1,520
2,430
4,290
8,760
15,800
25,600
52,700
95,700
152,000
70
60
126
237
486
728
1,400
2,230
3,950
8,050
14,600
23,600
48,500
88,100
139,000
80
56
117
220
452
677
1,300
2,080
3,670
7,490
13,600
22,000
45,100
81,900
130,000
90
52
110
207
424
635
1,220
1,950
3,450
7,030
12,700
20,600
42,300
76,900
122,000
100
50
104
195
400
600
1,160
1,840
3,260
6,640
12,000
19,500
40,000
72,600
115,000
125
44
92
173
355
532
1,020
1,630
2,890
5,890
10,600
17,200
35,400
64,300
102,000
150
40
83
157
322
482
928
1,480
2,610
5,330
9,650
15,600
32,100
58,300
92,300
175
37
77
144
296
443
854
1,360
2,410
4,910
8,880
14,400
29,500
53,600
84,900
200
34
71
134
275
412
794
1,270
2,240
4,560
8,260
13,400
27,500
49,900
79,000
250
30
63
119
244
366
704
1,120
1,980
4,050
7,320
11,900
24,300
44,200
70,000
300
27
57
108
221
331
638
1,020
1,800
3,670
6,630
10,700
22,100
40,100
63,400
350
25
53
99
203
305
587
935
1,650
3,370
6,100
9,880
20,300
36,900
58,400
400
23
49
92
189
283
546
870
1,540
3,140
5,680
9,190
18,900
34,300
54,300
450
22
46
86
177
266
512
816
1,440
2,940
5,330
8,620
17,700
32,200
50,900
500
21
43
82
168
251
484
771
1,360
2,780
5,030
8,150
16,700
30,400
48,100
550
20
41
78
159
239
459
732
1,290
2,640
4,780
7,740
15,900
28,900
45,700
600
19
39
74
152
228
438
699
1,240
2,520
4,560
7,380
15,200
27,500
43,600
650
18
38
71
145
218
420
669
1,180
2,410
4,360
7,070
14,500
26,400
41,800
700
17
36
68
140
209
403
643
1,140
2,320
4,190
6,790
14,000
25,300
40,100
750
17
35
66
135
202
389
619
1,090
2,230
4,040
6,540
13,400
24,400
38,600
800
16
34
63
130
195
375
598
1,060
2,160
3,900
6,320
13,000
23,600
37,300
850
16
33
61
126
189
363
579
1,020
2,090
3,780
6,110
12,600
22,800
36,100
900
15
32
59
122
183
352
561
992
2,020
3,660
5,930
12,200
22,100
35,000
950
15
31
58
118
178
342
545
963
1,960
3,550
5,760
11,800
21,500
34,000
1,000
14
30
56
115
173
333
530
937
1,910
3,460
5,600
11,500
20,900
33,100
1,100
14
28
53
109
164
316
503
890
1,810
3,280
5,320
10,900
19,800
31,400
1,200
13
27
51
104
156
301
480
849
1,730
3,130
5,070
10,400
18,900
30,000
1,300
12
26
49
100
150
289
460
813
1,660
3,000
4,860
9,980
18,100
28,700
1,400
12
25
47
96
144
277
442
781
1,590
2,880
4,670
9,590
17,400
27,600
1,500
11
24
45
93
139
267
426
752
1,530
2,780
4,500
9,240
16,800
26,600
1,600
11
23
44
89
134
258
411
727
1,480
2,680
4,340
8,920
16,200
25,600
1,700
11
22
42
86
130
250
398
703
1,430
2,590
4,200
8,630
15,700
24,800
1,800
10
22
41
84
126
242
386
682
1,390
2,520
4,070
8,370
15,200
24,100
1,900
10
21
40
81
122
235
375
662
1,350
2,440
3,960
8,130
14,800
23,400
2,000
NA
20
39
79
119
229
364
644
1,310
2,380
3,850
7,910
14,400
22,700
For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per square inch = 6.895 kPa, 1-inch water column = 0.2488 kPa, 1 British thermal unit per hour = 0.293 1 W, 1 cubic foot per hour = 0.0283 m
3
/h, 1 degree = 0.01745 rad.
Notes:
1. NA means a flow of less than 10 cfh.
2. All table entries have been rounded to three significant digits.
Table 402.4(3) Schedule 40 Metallic Pipe
Gas
Natural
Inlet Pressure
Less than 2 psi
Pressure Drop
3.0 in. w.c.
Specific Gravity
0.60
Intended Use: Initial supply pressure of 8.0 inches w.c. or greater
Pipe Size (inch)
Nominal
1/2
3/4
1
1 1/4
1 1/2
2
2 1/2
3
4
Actual ID
0.622
0.824
1.049
1.380
1.610
2.067
2.469
3.068
4.026
Length (ft)
Capacity in Cubic Feet of Gas Per Hour
10
454
949
1,790
3,670
5,500
10,600
16,900
29,800
60,800
20
312
652
1,230
2,520
3,780
7,280
11,600
20,500
41,800
30
250
524
986
2,030
3,030
5,840
9,310
16,500
33,600
40
214
448
844
1,730
2,600
5,000
7,970
14,100
28,700
50
190
397
748
1,540
2,300
4,430
7,070
12,500
25,500
60
172
360
678
1,390
2,090
4,020
6,400
11,300
23,100
70
158
331
624
1,280
1,920
3,700
5,890
10,400
21,200
80
147
308
580
1,190
1,790
3,440
5,480
9,690
19,800
90
138
289
544
1,120
1,680
3,230
5,140
9,090
18,500
100
131
273
514
1,060
1,580
3,050
4,860
8,580
17,500
125
116
242
456
936
1,400
2,700
4,300
7,610
15,500
150
105
219
413
848
1,270
2,450
3,900
6,890
14,100
175
96
202
380
780
1,170
2,250
3,590
6,340
12,900
200
90
188
353
726
1,090
2,090
3,340
5,900
12,000
250
80
166
313
643
964
1,860
2,960
5,230
10,700
300
72
151
284
583
873
1,680
2,680
4,740
9,700
350
66
139
261
536
803
1,550
2,470
4,360
8,900
400
62
129
243
499
747
1,440
2,290
4,060
8,300
450
58
121
228
468
701
1,350
2,150
3,800
7,800
500
55
114
215
442
662
1,280
2,030
3,590
7,300
550
52
109
204
420
629
1,210
1,930
3,410
7,000
600
50
104
195
400
600
1,160
1,840
3,260
6,640
650
47
99
187
384
575
1,110
1,760
3,120
6,360
700
46
95
179
368
552
1,060
1,700
3,000
6,110
750
44
92
173
355
532
1,020
1,630
2,890
5,890
800
42
89
167
343
514
989
1,580
2,790
5,680
850
41
86
162
332
497
957
1,530
2,700
5,500
900
40
83
157
322
482
928
1,480
2,620
5,330
950
39
81
152
312
468
901
1,440
2,540
5,180
1,000
38
79
148
304
455
877
1,400
2,470
5,040
1,100
36
75
141
289
432
833
1,330
2,350
4,780
1,200
34
71
134
275
412
794
1,270
2,240
4,560
1,300
33
68
128
264
395
761
1,210
2,140
4,370
1,400
31
65
123
253
379
731
1,170
2,060
4,200
1,500
30
63
119
244
366
704
1,120
1,980
4,050
1,600
29
61
115
236
353
680
1,080
1,920
3,910
1,700
28
59
111
228
342
658
1,050
1,850
3,780
1,800
27
57
108
221
331
638
1,020
1,800
3,670
1,900
27
56
105
215
322
619
987
1,750
3,560
2,000
26
54
102
209
313
602
960
1,700
3,460
For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per square inch = 6.895 kPa, 1-inch water column = 0.2488 kPa, 1 British thermal unit per hour = 0.293 1 W, 1 cubic foot per hour = 0.0283 m
3
/h, 1 degree = 0.0 1745 rad.
Note: All table entries have been rounded to three significant digits.
Table 402.4(4) Schedule 40 Metallic Pipe
Gas
Natural
Inlet Pressure
Less than 2 psi
Pressure Drop
6.0 in. w.c.
Specific Gravity
0.60
Intended Use: Initial supply pressure of 11.0 inches w.c. or greater
Pipe Size (inch)
Nominal
1/2
3/4
1
1 1/4
1 1/2
2
2 1/2
3
4
Actual ID
0.622
0.824
1.049
1.380
1.610
2.067
2.469
3.068
4.026
Length (ft)
Capacity in Cubic Feet of Gas Per Hour
10
660
1,380
2,600
5,340
8,000
15,400
24,600
43,400
88,500
20
454
949
1,790
3,670
5,500
10,600
16,900
29,900
60,800
30
364
762
1,440
2,950
4,420
8,500
13,600
24,000
48,900
40
312
652
1,230
2,520
3,780
7,280
11,600
20,500
41,800
50
276
578
1,090
2,240
3,350
6,450
10,300
18,200
37,100
60
250
524
986
2,030
3,030
5,840
9,310
16,500
33,600
70
230
482
907
1,860
2,790
5,380
8,570
15,100
30,900
80
214
448
844
1,730
2,600
5,000
7,970
14,100
28,700
90
201
420
792
1,630
2,440
4,690
7,480
13,200
27,000
100
190
397
748
1,540
2,300
4,430
7,070
12,500
25,500
125
168
352
663
1,360
2,040
3,930
6,260
11,100
22,600
150
153
319
601
1,230
1,850
3,560
5,670
10,000
20,500
175
140
293
553
1,140
1,700
3,280
5,220
9,230
18,800
200
131
273
514
1,060
1,580
3,050
4,860
8,580
17,500
250
116
242
456
936
1,400
2,700
4,300
7,610
15,500
300
105
219
413
848
1,270
2,450
3,900
6,890
14,100
350
96
202
380
780
1,170
2,250
3,590
6,340
12,900
400
90
188
353
726
1,090
2,090
3,340
5,900
12,000
450
84
176
332
681
1,020
1,970
3,130
5,540
11,300
500
80
166
313
643
964
1,860
2,960
5,230
10,700
550
76
158
297
611
915
1,760
2,810
4,970
10,100
600
72
151
284
583
873
1,680
2,680
4,740
9,660
650
69
144
272
558
836
1,610
2,570
4,540
9,250
700
66
139
261
536
803
1,550
2,470
4,360
8,890
750
64
134
252
516
774
1,490
2,380
4,200
8,560
800
62
129
243
499
747
1,440
2,290
4,060
8,270
850
60
125
235
483
723
1,390
2,220
3,920
8,000
900
58
121
228
468
701
1,350
2,150
3,800
7,760
950
56
118
221
454
681
1,310
2,090
3,700
7,540
1,000
55
114
215
442
662
1,280
2,030
3,590
7,330
1,100
52
109
204
420
629
1,210
1,930
3,410
6,960
1,200
50
104
195
400
600
1,160
1,840
3,260
6,640
1,300
47
99
187
384
575
1,100
1,760
3,120
6,360
1,400
46
95
179
368
552
1,060
1,700
3,000
6,110
1,500
44
92
173
355
532
1,020
1,630
2,890
5,890
1,600
42
89
167
343
514
989
1,580
2,790
5,680
1,700
41
86
162
332
497
957
1,530
2,700
5,500
1,800
40
83
157
322
482
928
1,480
2,620
5,330
1,900
39
81
152
312
468
901
1,440
2,540
5,180
2,000
38
79
148
304
455
877
1,400
2,470
5,040
For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per square inch = 6.895 kPa, 1-inch water column = 0.2488 kPa, 1 British thermal unit per hour = 0.293 1 W, 1 cubic foot per hour = 0.0283 m
3
/h, 1 degree = 0.0 1745 rad.
Note: All table entries have been rounded to three significant digits.
Table 402.4(5) Schedule 40 Metallic Pipe
Gas
Natural
Inlet Pressure
2.0 psi
Pressure Drop
1.0 psi
Specific Gravity
0.60
Pipe Size (inch)
Nominal
1/2
3/4
1
1 1/4
1 1/2
2
2 1/2
3
4
Actual ID
0.622
0.824
1.049
1.380
1.610
2.067
2.469
3.068
4.026
Length (ft)
Capacity in Cubic Feet of Gas Per Hour
10
1,510
3,040
5,560
11,400
17,100
32,900
52,500
92,800
189,000
20
1,070
2,150
3,930
8,070
12,100
23,300
37,100
65,600
134,000
30
869
1,760
3,210
6,590
9,880
19,000
30,300
53,600
109,000
40
753
1,520
2,780
5,710
8,550
16,500
26,300
46,400
94,700
50
673
1,360
2,490
5,110
7,650
14,700
23,500
41,500
84,700
60
615
1,240
2,270
4,660
6,980
13,500
21,400
37,900
77,300
70
569
1,150
2,100
4,320
6,470
12,500
19,900
35,100
71,600
80
532
1,080
1,970
4,040
6,050
11,700
18,600
32,800
67,000
90
502
1,010
1,850
3,810
5,700
11,000
17,500
30,900
63,100
100
462
934
1,710
3,510
5,260
10,100
16,100
28,500
58,200
125
414
836
1,530
3,140
4,700
9,060
14,400
25,500
52,100
150
372
751
1,370
2,820
4,220
8,130
13,000
22,900
46,700
175
344
695
1,270
2,601
3,910
7,530
12,000
21,200
43,300
200
318
642
1,170
2,410
3,610
6,960
11,100
19,600
40,000
250
279
583
1,040
2,140
3,210
6,180
9,850
17,400
35,500
300
253
528
945
1,940
2,910
5,600
8,920
15,800
32,200
350
232
486
869
1,790
2,670
5,150
8,210
14,500
29,600
400
216
452
809
1,660
2,490
4,790
7,640
13,500
27,500
450
203
424
759
1,560
2,330
4,500
7,170
12,700
25,800
500
192
401
717
1,470
2,210
4,250
6,770
12,000
24,400
550
182
381
681
1,400
2,090
4,030
6,430
11,400
23,200
600
174
363
650
1,330
2,000
3,850
6,130
10,800
22,100
650
166
348
622
1,280
1,910
3,680
5,870
10,400
21,200
700
160
334
598
1,230
1,840
3,540
5,640
9,970
20,300
750
154
322
576
1,180
1,770
3,410
5,440
9,610
19,600
800
149
311
556
1,140
1,710
3,290
5,250
9,280
18,900
850
144
301
538
1,100
1,650
3,190
5,080
8,980
18,300
900
139
292
522
1,070
1,600
3,090
4,930
8,710
17,800
950
135
283
507
1,040
1,560
3,000
4,780
8,460
17,200
1,000
132
275
493
1,010
1,520
2,920
4,650
8,220
16,800
1,100
125
262
468
960
1,440
2,770
4,420
7,810
15,900
1,200
119
250
446
917
1,370
2,640
4,220
7,450
15,200
1,300
114
239
427
878
1,320
2,530
4,040
7,140
14,600
1,400
110
230
411
843
1,260
2,430
3,880
6,860
14,000
1,500
106
221
396
812
1,220
2,340
3,740
6,600
13,500
1,600
102
214
382
784
1,180
2,260
3,610
6,380
13,000
1,700
99
207
370
759
1,140
2,190
3,490
6,170
12,600
1,800
96
200
358
736
1,100
2,120
3,390
5,980
12,200
1,900
93
195
348
715
1,070
2,060
3,290
5,810
11,900
2,000
91
189
339
695
1,040
2,010
3,200
5,650
11,500
For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per square inch = 6.895 kPa, 1-inch water column = 0.2488 kPa, 1 British thermal unit per hour = 0.293 1 W, 1 cubic foot per hour = 0.0283 m
3
/h, 1 degree = 0.0 1745 rad.
Note: All table entries have been rounded to three significant digits.
Table 402.4(6) Schedule 40 Metallic Pipe
Gas
Natural
Inlet Pressure
3.0 psi
Pressure Drop
2.0 psi
Specific Gravity
0.60
Pipe Size (inch)
Nominal
1/2
3/4
1
1 1/4
1 1/2
2
2 1/2
3
4
Actual ID
0.622
0.824
1.049
1.380
1.610
2.067
2.469
3.068
4.026
Length (ft)
Capacity in Cubic Feet of Gas Per Hour
10
2,350
4,920
9,270
19,000
28,500
54,900
87,500
155,000
316,000
20
1,620
3,380
6,370
13,100
19,600
37,700
60,100
106,000
217,000
30
1,300
2,720
5,110
10,500
15,700
30,300
48,300
85,400
174,000
40
1,110
2,320
4,380
8,990
13,500
25,900
41,300
73,100
149,000
50
985
2,060
3,880
7,970
11,900
23,000
36,600
64,800
132,000
60
892
1,870
3,520
7,220
10,800
20,800
33,200
58,700
120,000
70
821
1,720
3,230
6,640
9,950
19,200
30,500
54,000
110,000
80
764
1,600
3,010
6,180
9,260
17,800
28,400
50,200
102,000
90
717
1,500
2,820
5,800
8,680
16,700
26,700
47,100
96,100
100
677
1,420
2,670
5,470
8,200
15,800
25,200
44,500
90,800
125
600
1,250
2,360
4,850
7,270
14,000
22,300
39,500
80,500
150
544
1,140
2,140
4,400
6,590
12,700
20,200
35,700
72,900
175
500
1,050
1,970
4,040
6,060
11,700
18,600
32,900
67,100
200
465
973
1,830
3,760
5,640
10,900
17,300
30,600
62,400
250
412
862
1,620
3,330
5,000
9,620
15,300
27,100
55,300
300
374
781
1,470
3,020
4,530
8,720
13,900
24,600
50,100
350
344
719
1,350
2,780
4,170
8,020
12,800
22,600
46,100
400
320
669
1,260
2,590
3,870
7,460
11,900
21,000
42,900
450
300
627
1,180
2,430
3,640
7,000
11,200
19,700
40,200
500
283
593
1,120
2,290
3,430
6,610
10,500
18,600
38,000
550
269
563
1,060
2,180
3,260
6,280
10,000
17,700
36,100
600
257
537
1,010
2,080
3,110
5,990
9,550
16,900
34,400
650
246
514
969
1,990
2,980
5,740
9,150
16,200
33,000
700
236
494
931
1,910
2,860
5,510
8,790
15,500
31,700
750
228
476
897
1,840
2,760
5,310
8,470
15,000
30,500
800
220
460
866
1,780
2,660
5,130
8,180
14,500
29,500
850
213
445
838
1,720
2,580
4,960
7,910
14,000
28,500
900
206
431
812
1,670
2,500
4,810
7,670
13,600
27,700
950
200
419
789
1,620
2,430
4,670
7,450
13,200
26,900
1,000
195
407
767
1,580
2,360
4,550
7,240
12,800
26,100
1,100
185
387
729
1,500
2,240
4,320
6,890
12,200
24,800
1,200
177
369
695
1,430
2,140
4,120
6,570
11,600
23,700
1,300
169
353
666
1,370
2,050
3,940
6,290
11,100
22,700
1,400
162
340
640
1,310
1,970
3,790
6,040
10,700
21,800
1,500
156
327
616
1,270
1,900
3,650
5,820
10,300
21,000
1,600
151
316
595
1,220
1,830
3,530
5,620
10,000
20,300
1,700
146
306
576
1,180
1,770
3,410
5,440
9,610
19,600
1,800
142
296
558
1,150
1,720
3,310
5,270
9,320
19,000
1,900
138
288
542
1,110
1,670
3,210
5,120
9,050
18,400
2,000
134
280
527
1,080
1,620
3,120
4,980
8,800
18,000
For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per square inch = 6.895 kPa, 1-inch water column = 0.2488 kPa, 1 British thermal unit per hour = 0.293 1 W, 1 cubic foot per hour = 0.0283 m
3
/h, 1 degree = 0.01745 rad.
Note: All table entries have been rounded to three significant digits.
Table 402.4(7) Schedule 40 Metallic Pipe
Gas
Natural
Inlet Pressure
5.0 psi
Pressure Drop
3.5 psi
Specific Gravity
0.60
Pipe Size (inch)
Nominal
1/2
3/4
1
1 1/4
1 1/2
2
2 1/2
3
4
Actual ID
0.622
0.824
1.049
1.380
1.610
2.067
2.469
3.068
4.026
Length (ft)
Capacity in Cubic Feet of Gas Per Hour
10
3,190
6,430
11,800
24,200
36,200
69,700
111,000
196,000
401,000
20
2,250
4,550
8,320
17,100
25,600
49,300
78,600
139,000
283,000
30
1,840
3,720
6,790
14,000
20,900
40,300
64,200
113,000
231,000
40
1,590
3,220
5,880
12,100
18,100
34,900
55,600
98,200
200,000
50
1,430
2,880
5,260
10,800
16,200
31,200
49,700
87,900
179,000
60
1,300
2,630
4,800
9,860
14,800
28,500
45,400
80,200
164,000
70
1,200
2,430
4,450
9,130
13,700
26,400
42,000
74,300
151,000
80
1,150
2,330
4,260
8,540
12,800
24,700
39,300
69,500
142,000
90
1,060
2,150
3,920
8,050
12,100
23,200
37,000
65,500
134,000
100
979
1,980
3,620
7,430
11,100
21,400
34,200
60,400
123,000
125
876
1,770
3,240
6,640
9,950
19,200
30,600
54,000
110,000
150
786
1,590
2,910
5,960
8,940
17,200
27,400
48,500
98,900
175
728
1,470
2,690
5,520
8,270
15,900
25,400
44,900
91,600
200
673
1,360
2,490
5,100
7,650
14,700
23,500
41,500
84,700
250
558
1,170
2,200
4,510
6,760
13,000
20,800
36,700
74,900
300
506
1,060
1,990
4,090
6,130
11,800
18,800
33,300
67,800
350
465
973
1,830
3,760
5,640
10,900
17,300
30,600
62,400
400
433
905
1,710
3,500
5,250
10,100
16,100
28,500
58,100
450
406
849
1,600
3,290
4,920
9,480
15,100
26,700
54,500
500
384
802
1,510
3,100
4,650
8,950
14,300
25,200
51,500
550
364
762
1,440
2,950
4,420
8,500
13,600
24,000
48,900
600
348
727
1,370
2,810
4,210
8,110
12,900
22,900
46,600
650
333
696
1,310
2,690
4,030
7,770
12,400
21,900
44,600
700
320
669
1,260
2,590
3,880
7,460
11,900
21,000
42,900
750
308
644
1,210
2,490
3,730
7,190
11,500
20,300
41,300
800
298
622
1,170
2,410
3,610
6,940
11,100
19,600
39,900
850
288
602
1,130
2,330
3,490
6,720
10,700
18,900
38,600
900
279
584
1,100
2,260
3,380
6,520
10,400
18,400
37,400
950
271
567
1,070
2,190
3,290
6,330
10,100
17,800
36,400
1,000
264
551
1,040
2,130
3,200
6,150
9,810
17,300
35,400
1,100
250
524
987
2,030
3,030
5,840
9,320
16,500
33,600
1,200
239
500
941
1,930
2,900
5,580
8,890
15,700
32,000
1,300
229
478
901
1,850
2,770
5,340
8,510
15,000
30,700
1,400
220
460
866
1,780
2,660
5,130
8,180
14,500
29,500
1,500
212
443
834
1,710
2,570
4,940
7,880
13,900
28,400
1,600
205
428
806
1,650
2,480
4,770
7,610
13,400
27,400
1,700
198
414
780
1,600
2,400
4,620
7,360
13,000
26,500
1,800
192
401
756
1,550
2,330
4,480
7,140
12,600
25,700
1,900
186
390
734
1,510
2,260
4,350
6,930
12,300
25,000
2,000
181
379
714
1,470
2,200
4,230
6,740
11,900
24,300
For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per square inch = 6.895 kPa, 1-inch water column = 0.2488 kPa, 1 British thermal unit per hour = 0.293 1 W, 1 cubic foot per hour = 0.0283 m
3
/h, 1 degree = 0.0 1745 rad.
Note: All table entries have been rounded to three significant digits.
The pipe size of each section of gas piping shall be determined using the longest length of piping from the point of delivery to the most remote outlet and the load of the section.
402.4.2 Branch length method.
Pipe shall be sized as follows:
1. Pipe size of each section of the longest pipe run from the point of delivery to the most remote outlet shall be determined using the longest run of piping and the load of the section.
2. The pipe size of each section of branch piping not previously sized shall be determined using the length of piping from the point of delivery to the most remote outlet in each branch and the load of the section.
402.4.3 Hybrid pressure.
The pipe size for each section of higher pressure gas piping shall be determined using the longest length of piping from the point of delivery to the most remote line pressure regulator. The pipe size from the line pressure regulator to each outlet shall be determined using the length of piping from the regulator to the most remote outlet served by the regulator.
402.5 Allowable pressure drop.
The design pressure loss in any piping system under maximum probable flow conditions, from the point of delivery to the inlet connection of the appliance, shall be such that the supply pressure at the appliance is greater than or equal to the minimum pressure required by the appliance.
402.6 Gas distribution pressures.
The maximum design operating pressure for piping systems located inside buildings shall not exceed 1/2 pounds per square inch gauge (psig) (3.5 kPa gauge).
Exceptions:
1. Pressure not exceeding 5 psig (34.5 kPa gauge) is permitted where a system supplies one or more appliances that require gas pressure in excess of 1/2 psig (3.5 kPa gauge).
2. Gas pressure not exceeding 15 psig (103.4 kPa gauge) is permitted for appliances in excess of 100,000 cubic feet per hour (2830 m
3
/h) provided the gas distribution piping is installed as provided for in Section 404.
3. The use of pressure in excess of 15 psig (103.4 kPa gauge) shall be permitted for distribution piping provided all of the requirements of Section 406 and Appendix G are met.
Collected 2026-09-06T02:48:57Z. Source file · JSON