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MAGNET CRYOGENIC VENT SYSTEM PRESSURE DROP MATRIX
Distance of
Outer
Pressure
vent system
dia.
drop for
component
of
straight
from magnet
pipe
pipe
(D)
psi/ft
kPa/m
ft
m
0- 10
0.00-3.05
0.14
3.22
10-20
3.05-6.10
0.24
5.49
20- 30
6.10-9.15
0.36
8.23
8 in.
30- 40
9.15-12.2
0.47
10.65
(200mm)
40- 50
12.20-15.25
0.57
12.80
50- 60
15.25-18.30
0.65
14.68
60- 80
18.29-24.39
0.77
17.44
0-20
0.00-6.10
0.06
1.280
20-40
6.10-12.22
0.12
2.725
10 in.
40-60
12.22-18.29
0.17
3.904
(250mm)
60-80
18.29-24.39
0.21
4.859
80-100
24.39-30.49
0.25
5.626
0-20
0.00-6.10
0.020
0.441
20-40
6.10-12.22
0.041
0.937
12 in.
40-60
12.22-18.29
0.060
1.353
(300mm)
60-80
18.29-24.39
0.075
1.702
80-100
24.39-30.49
0.088
1.991
0-20
0.00-6.10
0.008
0.180
20-40
6.10-12.22
0.017
0.380
14 in.
40-60
12.22-18.29
0.024
0.552
(350mm)
60-80
18.29-24.39
0.031
0.699
80-100
24.39-30.49
0.036
0.824
0-20
0.00-6.10
0.004
0.083
20-40
6.10-12.22
0.008
0.174
16 in.
40-60
12.22-18.29
0.011
0.253
(400mm)
60-80
18.29-24.39
0.014
0.323
80-100
24.39-30.49
0.017
0.383
Notes
1.
Elbows with angles greater than 90 deg must not be used
2.
Data in Table 2 is based on the following facts and assumptions:
a.
Initial flow conditions at magnet interface
b.
EM energy (13MJ) is dumped to He during quench and rises He temperature to 10 Kelvin
c.
Gas temperature starting at 10 Kelvin and increase with length determined by thermal energy balance
d.
90% He is assumed to be evacuated within 30 sec. None left after quench.
e.
Absolute roughness is assumed to be 0.25 mm.
f.
R/D = 1.0 for standard sweep elbows, R/D = 1.5 for long sweep elbows where D = outer diameter of pipe; R =
radius of bend
3.
The total pressure drop of the entire cryogenic vent system must be less than 20 psi (138 kPa). The calculation
starts at the magnet vent interface and ends at the termination point outside the building.
Typical
Std
Long
Std
Long
sweep 45
sweep
sweep 90
sweep 90
elbow
elbow
elbow
elbow
psi
psi
psi
psi
kPa
kPa
kPa
1.12
7.70
0.74
5.13
2.09
14.43
1.40
1.83
12.63
1.22
8.42
3.43
23.67
2.29
2.49
17.20
1.66
11.45
4.67
32.21
3.11
3.11
21.42
2.07
14.26
5.82
40.11
3.88
3.67
25.32
2.45
16.86
6.88
47.42
4.58
4.20
28.93
2.79
19.26
7.86
54.17
5.24
5.13
35.35
3.41
23.53
9.60
66.16
6.40
0.62
4.29
0.41
2.86
1.17
8.04
0.78
1.05
7.25
0.70
4.83
1.97
13.58
1.31
1.43
9.86
0.95
6.56
2.67
18.44
1.78
1.76
12.14
1.17
8.07
3.29
22.70
2.19
2.05
14.14
1.36
9.40
3.83
26.43
2.56
0.26
1.78
0.17
1.19
0.48
3.34
0.32
0.43
3.00
0.29
1.99
0.81
5.61
0.54
0.59
4.08
0.39
2.72
1.11
7.64
0.74
0.73
5.06
0.49
3.36
1.37
9.45
0.91
0.86
5.20
0.57
3.93
1.60
11.06
1.07
0.123
0.85
0.082
0.57
0.231
1.59
0.154
0.206
1.42
0.137
0.95
0.386
2.66
0.257
0.281
1.94
0.187
1.29
0.525
3.62
0.350
0.349
2.41
0.232
1.60
0.652
4.50
0.435
0.411
2.83
0.272
1.88
0.766
5.28
0.511
0.065
0.45
0.043
0.30
0.122
0.84
0.081
0.108
0.75
0.072
0.50
0.202
1.39
0.135
0.148
1.02
0.098
0.68
0.275
1.90
0.184
0.184
1.27
0.122
0.84
0.342
2.36
0.228
0.022
1.49
0.144
0.99
0.404
2.78
0.269
SIGNA PIONEER
90 miter
bend
psi
kPa
kPa
9.62
4.19
28.86
15.78
6.87
47.34
21.48
9.34
64.43
26.74
11.64
80.23
31.61
13.75
94.84
36.11
15.71
108.33
44.11
19.19
132.33
5.36
2.33
16.07
9.05
3.94
27.16
12.29
5.35
36.88
15.13
6.58
45.40
17.62
7.67
52.86
2.22
0.97
6.67
3.74
1.63
11.22
5.09
2.22
15.27
6.30
2.74
18.89
7.37
3.21
22.12
1.06
0.462
3.18
1.77
0.771
5.32
2.42
1.051
7.25
3.00
1.304
8.99
3.52
1.533
10.57
0.56
0.244
1.68
0.93
0.404
2.79
1.27
0.551
3.80
1.57
0.685
4.72
1.86
0.807
5.57
EN-MRI-TYP-SIGNA_PIONEER-WEB.DWG
Rev
A
Date
23/Jul/2018
M5 - Cryogenics (2)
18
/24
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