Maximum Capacity of Pipe in Cubic Feet of Natural Gas per Hour for Gas Pressures of
0.5 Psig or Less and a Pressure Drop of 0.3 Inch Water Column
(Based on a 0.60 Specific Gravity Gas)
Nominal
Iron Pipe
Size,
Inches
Internal
Diameter,
Inches
Length of Pipe, Feet
10
32
72
132
278
520
1,050
1,600
3,050
4,800
8,500
17,500
20
22
49
92
190
350
730
1,100
2,100
3,300
5,900
12,000
30
18
40
73
152
285
590
890
1,650
2,700
4,700
9,700
40
15
34
63
130
245
500
760
1,450
2,300
4,100
8,300
50
14
30
56
115
215
440
670
1,270
2,000
3,600
7,400
60
12
27
50
105
195
400
600
1,150
1,850
3,250
6,800
70
11
25
46
96
180
370
560
1,500
1,700
3,000
6,200
80
11
23
43
90
170
350
530
990
1,600
2,800
5,800
90
10
22
40
84
160
320
490
930
1,500
2,600
5,400
100
9
21
38
79
150
305
460
870
1,400
2,500
5,100
125
8
18
34
72
130
275
410
780
1,250
2,200
4,500
150
8
17
31
64
120
250
380
710
1,130
2,000
4,100
175
7
15
28
59
110
225
350
650
1,050
1,850
3,800
200
6
14
26
55
100
210
320
610
980
1,700
3,500
1/4"
3/8"
1/2"
3/4"
1"
1-1/4"
1-1/2"
2"
2-1/2"
3"
4"
.326
.493
.622
.824
1.049
1.380
1.610
2.067
2.469
3.026
4.026
Maximum Capacity of Pipe in Thousands of Btu per Hour of Undiluted Liquified
Petroleum Gases (at 11 Inches Water Column Inlet Pressure)
(Based on a Pressure Drop of 0.5 Inch Water Column)
Nominal
Iron Pipe
Size,
Inches
Length of Pipe, Feet
10
275
567
1071
2205
3307
6221
20
189
393
732
1496
2299
4331
30
152
315
590
1212
1858
3465
40
129
267
504
1039
1559
2992
50
114
237
448
937
1417
2646
60
103
217
409
834
1275
2394
70
96
196
378
771
1180
2205
80
89
185
346
724
1086
2047
90
83
173
322
677
1023
1921
100
78
162
307
630
967
1811
125
69
146
275
567
866
1606
150
63
132
252
511
787
1498
1/2"
3/4"
1"
1-1/4"
1-1/2"
2"
2. Determine total equivalent length of gas main. Re-
member, if exact number/type of fittings are not known,
for initial determination only, add 20% for fittings to the
straight length of piping to get a total equivalent length.
3. In Figure B3, find appropriate pipe length in upper por-
tion of table under "Length of Pipe, Feet" heading.
4. Move down the column; match the cubic feet per hour
(from Step 1). Higher capacity selection is acceptable.
5. Move across to the left-hand column "Nominal Iron
Pipe Size, Inches" and read required pipe size.
6. Once a diameter has been selected, verify the total
equivalent length.
Gas Headers (Propane)
1. Determine Btuh input for each bank of modules.
2. Determine the length of the header, which is typically
dependent on the length of the bank of modules which it
serves (see Figure B2). In most cases, the header is
straight pipe only.
3. In Figure B4, find appropriate pipe length in upper por-
tion of table under "Length of Pipe, Feet" heading.
4. Move down the column; match the Btuh input (from
Step 1). Higher capacity selection is acceptable.
5. Move across to the left-hand column "Nominal Iron
Pipe Size, Inches" and read required pipe size.
Gas Main (Propane)
1. Determine Btuh input for the total heating plant.
2. Determine total equivalent length of gas main. Re-
member, if exact number/type of fittings are not known,
for initial determination only, add 20% for fittings to the
straight length of piping to get a total equivalent length.
3. In Figure B4, find appropriate pipe length in upper por-
tion of table under "Length of Pipe, Feet" heading.
4. Move down the column; match the Btuh input (from
Step 1). Higher capacity selection is acceptable.
5. Move across to the left-hand column "Nominal Iron
Pipe Size, Inches" and read required pipe size.
6. Once a diameter has been selected, verify the total
equivalent length.
FIGURE B3
FIGURE B4
25
Содержание MultiTemp MR Series
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