Control systems Safety valves
4
Capacity Table - AIR - 10% Overpressure - SCFM (60ºF and 14.7 psi)
Orifice Designation / Current Area (in²)
Set pressure (bar g)
J
K
L
M
N
P
Q
R
1.375
1.968
3.054
3.846
4.634
6.830
11.812
17.121
15
703
1007
1562
1967
2371
3494
6043
8758
20
811
1161
1801
2268
2733
4028
6966
10098
25
918
1315
2040
2569
3096
4562
7890
11437
30 35
1026
1469
2279
2870
3458
5097
8814
12776
1144
1638
2542
3201
3857
5684
9831
14249
40
1263
1807
2805
3532
4255
6272
10847
15722
50
1499
2146
3330
4194
5053
7447
12880
18669
60
1736
2485
3856
4855
5850
8623
14912
21615
70
1973
2823
4381
5517
6648
9798
16945
24561
80
2209
3162
4907
6179
7445
10973
18978
27507
90
2446
3501
5432
6841
8243
12149
21010
30454
100
2682
3839
5958
7503
9040
13324
23043
33400
4.7 11
110
2919
4178
6483
8165
9837
14499
25076
36346
120 130 140 150 160
3156
4517
7009
8826
10635
15675
27108
39292
3392
4855
7534
9488
11432
16850
29141
42239
3629
5194
8060
10150
12230
18025
31174
45185
3865
5533
8585
10812
13027
19201
33206
48131
4102
5871
9111
11474
13825
20376
35239
51077
180
4575
6548
10162
12797
15420
22727
39304
56970
190
4812
6887
10688
13459
16217
23902
41337
59916
200
5049
7226
11213
14121
17014
25077
43370
62862
230
5758
8242
12790
16107
19407
28603
49468
71701
260
6468
9258
14366
18092
21799
32129
55566
80540
270
6705
9596
14892
18754
22597
33305
57598
83486
300
7415
10612
16469
20740
24989
36831
63696
92325
For sizing using current areas (ASME), the discharge coefficient K for air, gases and vapours is 0.853
TI-P709-01 CTLS Issue 1
Page 11 of 13
SV47H SG Iron Safety Valve
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