Control systems Safety valves
4
Capacity Table - Steam - 3% Overpressure – lb/h
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
1915
2741
4253
5356
6453
9511
16449
23842
20
2217
3173
4924
6201
7471
11011
19043
27603
25
2519
3605
5595
7045
8489
12512
21638
31363
30 35 40 50
2821
4037
6265
7890
9507
14012
24232
35124
3123
4470
6936
8735
10525
15512
26827
38884
3425
4902
7607
9580
11542
17012
29421
42645
4029
5766
8949
11269
13578
20013
34610
50166
60
4633
6631
10290
12959
15614
23013
39799
57687
70
5243
7504
11645
14665
17670
26043
45040
65284
80
5865
8395
13027
16405
19767
29134
50385
73031
90
6487
9285
14409
18146
21863
32224
55729
80777
100
7109
10176
15791
19886
23960
35315
61074
88524
4.7 7
110
7732
11066
17173
21626
26057
38405
66419
96271
120 130 140 150 160
8354
11956
18554
23366
28154
41495
71763
104018
8976
12847
19936
25106
30250
44586
77108
111765
9598
13737
21318
26847
32347
47676
82452
119511
10220
14628
22700
28587
34444
50767
87797
127258
10842
15518
24082
30327
36541
53857
93142
135005
180
12087
17299
26846
33807
40734
60038
103831
150499
190
12709
18190
28227
35548
42831
63128
109176
158245
200
13331
19080
29609
37288
44928
66218
114520
165992
230
15197
21752
33755
42509
51218
75490
130554
189233
260
17064
24423
37900
47729
57508
84761
146588
212473
270
17686
25314
39282
49469
59605
87851
151933
220220
300
19552
27985
43428
54690
65895
97122
167966
243460
For sizing using current areas (ASME), the discharge coefficient K for steam is 0.853.
TI-P709-01 CTLS Issue 1
Page 7 of 13
SV47H SG Iron Safety Valve
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