Control systems Safety valves
4
Table 3 - SV60 flow capacity for water in tonnes/h at 25% overpressure (calculated in accordance with AD-MERKBLATT A2 and TRD 421)
Valve size DN in/out
20/32
25/40 32/50 40/65 50/80 65/100 80/125 100/150 125/200 150/250
Orifice (mm)
17.0
23.8
30.6
38.0
50.1
59.0
73.0
91.0
105
125
Flow area (mm²)
230
445
740
1140
1979
2734
4185
6504
8659
12272
0.5
0.5
0.5
0.5
0.5
0.5
0.5
0.5
0.5
0.5
w
Set pressure (bar g)
Flow capacity for water tonnes/h
30.0
35.8
69.3
115.3
177.6
308.2
425.8
651.8
31.0
36.4
70.4
117.2
180.5
313.3
432.8
662.6
32.0
36.9
71.6
119.1
183.4
318.3
439.7
673.2
33.0
37.5
72.7
120.9
186.2
323.3
34.0
38.1
73.8
122.7
189.0
328.1
35.0
38.6
74.8
124.5
191.8
332.9
36.0
39.2
75.9
126.3
194.5
337.7
37.0
39.7
76.9
128.0
197.2
342.3
4.7 49
38.0
40.3
78.0
129.7
199.8
346.9
39.0
40.8
79.0
131.4
202.4
351.4
40.0
41.3
80.0
133.1
205.0
355.9
Table 4 w/Kdr values for SV60 safety valves
Set pressure (bar g)
Size
0.2 - 0.49 0.5 - 0.99 1.0 - 1.49 1.5 - 1.99 2.0 - 2.49 2.5 - 2.99 3.0 - 3.49 3.5 - 3.99 Above 4.0
DN20 x DN32
0.56
0.62
0.69
0.73
0.75
0.76
0.77
0.78
0.78
DN25 x DN40
0.62
0.67
0.75
0.80
0.82
0.84
0.85
0.85
0.86
DN32 x DN50
0.56
0.60
0.68
0.73
0.75
0.76
0.76
0.76
0.76
DN40 x DN65
0.45
0.51
0.59
0.64
0.66
0.68
0.68
0.68
0.68
DN50 x DN80
0.47
0.49
0.55
0.59
0.61
0.63
0.63
0.63
0.64
DN65 x DN100
0.50
0.55
0.61
0.66
0.68
0.69
0.70
0.71
0.71
DN80 x DN125
0.45
0.50
0.56
0.60
0.63
0.64
0.65
0.66
0.66
DN100 x DN150
0.48
0.52
0.59
0.63
0.66
0.67
0.68
0.69
0.70
DN125 x DN200
0.50
0.55
0.61
0.65
0.68
0.70
0.71
0.72
0.72
DN150 x DN250
0.51
0.56
0.62
0.66
0.69
0.71
0.72
0.73
0.73
TI-S13-27 CMGT Issue 17
Page 11 of 13
SV60 Safety Valve
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