Control systems Safety valves
4
Capacity Table - Steam - 10% 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
1975
2827
4387
5525
6657
9811
16968
24594
20
2277
3259
5058
6370
7675
11311
19562
28355
25
2579
3692
5729
7214
8692
12812
22157
32115
30 35
2881
4124
6399
8059
9710
14312
24751
35876
3213
4599
7137
8988
10830
15962
27605
40013
40
3546
5075
7875
9918
11950
17612
30459
44149
50
4210
6026
9351
11776
14189
20913
36167
52423
60
4875
6977
10827
13634
16428
24213
41875
60696
70
5539
7928
12303
15493
18667
27514
47583
68969
80
6203
8879
13778
17351
20907
30814
53291
77242
90
6868
9830
15254
19210
23146
34114
58998
85516
100
7532
10781
16730
21068
25385
37415
64706
93789
4.7 9
110
8197
11732
18206
22927
27624
40715
70414
102062
120 130 140 150 160
8861
12683
19681
24785
29864
44016
76122
110336
9526
13634
21157
26644
32103
47316
81830
118609
10190
14585
22633
28502
34342
50616
87538
126882
10854
15536
24109
30361
36581
53917
93245
135155
11519
16487
25584
32219
38821
57217
98953
143429
180
12848
18389
28536
35936
43299
63818
110369
159975
190
13512
19340
30012
37795
45538
67119
116077
168249
200
14177
20291
31488
39653
47778
70419
121785
176522
230
16170
23144
35915
45229
54496
80320
138908
201342
260
18163
25996
40342
50804
61213
90222
156032
226162
270
18828
26947
41818
52663
63453
93522
161740
234435
300
20821
29800
46245
58238
70170
103423
178863
259255
For sizing using current areas (ASME), the discharge coefficient K for steam is 0.853.
TI-P709-01 CTLS Issue 1
Page 9 of 13
SV47H SG Iron Safety Valve
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