Bulletin 7349A
Page 3
Natural Gas Capacities in SCFH (0.6 SG)
SELECTION
Capacities for 7349A and 7349A- -S models are identical, and both hold
outlet pressures with the same degree of accuracy. Use the 7349A- -S to
maintain downstream gas pressure at a point remote from the regulator
itself. Select 7349A- -V for high ambient temperature applications.
When selecting a regulator for other than natural gas, divide required
fl ow by the appropriate gas gravity factor (Table C) and use the resulting
equivalent fl ow to size the regulator from Figure 3.
TABLE C. Regulator capacity correction factors for diff erent gas
gravities.
Gas (typical) Coke oven Natural Air
Propane Butane
Gas Gravity
0.4
0.6
1.0
1.5
2.0
Factor 1.22
1.00
0.774
0.632
0.547
Sizing Example:
Select a regulator for 39,000 scfh of Coke Oven Gas
with 50 osi inlet pressure and an outlet pressure of 18 osi.
Solution:
Correct 39,000 scfh of coke oven gas to the natural gas
equivalent by dividing 39,000 scfh by the correction factor of 1.22
found in Table C. (39,000 ÷ 1.22 = 31,967 scfh natural gas equivalence).
Using table B, select the desired outlet pressure column, or next highest
available. 18 osi is unavailable, therefore use the 20 osi column. Select
desired inlet pressure, or next lowest available, from the inlet pressure
column. 50 osi is unavailable therefore use the 48 osi row. Follow the 48
osi inlet pressure row until it intersects with the 20 osi outlet column to
determine maximum gas fl ow of each size regulator. Select the small-
est regulator that will fl ow 31,967 scfh natural gas or more. Select the
7349A-6 which will pass 34,049 scfh natural gas with 48 osi inlet pres-
sure and 20 osi outlet pressure. From table A, select the red spring “R” to
provide an outlet pressure of 18 osi. Specify a 7349A-6-R.
Size
(osi)
4
8
10
14
16 20
24
7349A-01
16
698
570 494
285
32
1066
987
945
855
806
698
570
48
1337
1275
1242
1175
1140
1066
987
64
1561
1508
1481
1425
1396
1337
1275
80
1757
1710
1686
1637
1612
1561
1508
7349A-0
16
1323 1080 935
540
32
2020
1871
1791
1620
1527
1323
1080
48
2533
2415
2354
2226
2160
2020
1871
64
2958
2857
2806
2700
2645
2533
2415
80
3329
3240
3195
3102
3055
2958
2857
7349A-1
16
1715 1400 1212 700
32
2619
2425
2322
2100
1980
1715
1400
48
3283
3130
3051
2886
2800
2619
2425
64
3834
3704
3637
3500
3429
3283
3130
80
4315
4200
4141
4021
3960
3834
3704
7349A-2
16
4238 3460 2996 1730
32
6473
5993
5738
5190
4893
4238
3460
48
8114
7737
7541
7133
6920
6473
5993
64
9476
9154
8989
8650
8475
8114
7737
80
10664
10380
10235
9938
9786
9476
9154
7349A-3
16
6859 5600 4850 2800
32
10477
9699
9287
8400
7920
6859
5600
48
13133
12522
12205
11545
11200
10477
9699
64
15336
14816
14549
14000
13717
13133
12522
80
17260
16800
16565
16085
15839
15336
14816
7349A-4
16
11758 9600 8314 4800
32
17960
16628
15920
14400
13576
11758
9600
48
22514
21466
20923
19791
19200
17960
16628
64
26291
25399
24942
24000
23515
22514
21466
80
29589
28800
28397
27574
27153
26291
25399
7349A-5
16
16901 13800 11951 6900
32
25817
23902
22885
20700
19516
16901
13800
48
32364
30858
30076
28449
27600
25817
23902
64
37793
36511
35853
34500
33803
32364
30858
80
42534
41400
40821
39637
39032
37793
36511
7349A-6
16
22290 18200 15762 9100
32
34049
31523
30181
27300
25739
22290
18200
48
42683
40696
39666
37520
36400
34049
31523
64
49843
48153
47285
45500
44581
42683
40696
80
56096
54600
53836
52276
51477
49843
48153
7349A-7
16
43111 35200
30484 17600
32
65853
60968
58373
52800
49780
43111
35200
48
82551
78710
76717
72567
70400
65853
60968
64
96399
93130
91452
88000
86222
82551
78710
80
108494
105600
104123
101104
99561
96399
93130
Inlet
Pressure
Outlet Pressure Setting osi.
Table B. 7349A Capacities
