7 Magnet Cryogenic Venting Pressure Drop Reference Tables
Use the following tables to calculate the cryogenic vent pressure drop through the pipe used.
Table 7-3: 1.5T Magnet Cryogenic Vent System Pressure Drop Matrix
Inside
dia. of
vent
pipe (D)
Distance of vent system
component from magnet
Pressure drop for
straight pipe with
smooth inside sur‐
face
Pressure Drop Per Elbow Used Anywhere Within A 20 Ft (6.1 M) Vent Segment
Standard Sweep Long Sweep
Std sweep 45° el‐
bow (K = 15 F
t
)
Std sweep 90° el‐
bow (K = 30F
t
)
Long sweep 45° el‐
bow (K = 7.5F
t
)
Long sweep 90°
elbow (K = 15 F
t
)
ft m psi/ft kPa/m psi kPa psi kPa psi kPa psi kPa
8 in.
(203.2
mm)
00- 20
0 -6.1 0.10 2.26 1.10 7.58 2.06 14.20 0.55 3.79 1.03 7.10
20- 40 6.1 -12.2 021 4.75 2.10 14.48 3.70 25.51 1.03 7.10 1.85 12.76
40- 60 12.2 -18.3 0.30 6.79 2.88 19.86 5.21 35.92 1.44 9.93 2.60 17.92
60-80 18.3-24.4 0.38 8.60 3.70 25.51 6.71 46.27 1.85 12.76 3.36 23.17
80-100 24.430.5 0.47 10.63 4.52 31.17 8.22 56.68 2.26 15.58 4.11 28.34
10 in.
(250
mm)
0- 20
0 - 6.1 0.03 0.68 0.55 3.79 0.82 5.65 0.27 1.86 0.41 2.83
20- 40 6.1 -12.2 0.07 1.58 0.82 5.65 1.51 10.41 0.41 2.83 0.75 5.17
40- 60 12.2 -18.3 0.10 2.26 1.23 8.48 2.19 15.10 0.62 4.27 1.10 7.58
60- 80 18.3 -24.4 0.12 2.71 1.51 10.41 2.74 18.89 0.75 5.17 1.37 9.45
80- 100 24.4 -30.5 0.16 3.62 1.92 13.24 3.43 23.65 0.96 6.62 1.71 11.79
12 in.
(300
mm)
0- 20
0 - 6.1 0.013 0.29 0.27 1.86 0.41 2.83 0.14 0.97 0.21 1.45
20- 40 6.1 -12.2 0.027 0.61 0.41 2.83 0.82 5.65 0.21 1.45 0.41 2.83
40- 60 12.2 -18.3 0.041 0.93 0.55 3.79 1.10 7.58 0.27 1.86 0.55 3.79
60- 80 18.3 -24.4 0.054 1.22 0.69 4.76 1.37 9.45 0.34 2.34 0.69 4.76
80- 100 24.4 -30.5 0.069 1.56 0.96 6.62 1.51 10.41 0.48 3.31 0.75 5.17
100-120 30.5-36.6 0.08 1.81 1.09 7.52 1.77 12.20 0.55 3.79 0.88 6.07
120-140 36.6-42.7 0.10 2.26 1.27 8.76 2.07 14.30 0.63 4.34 1.04 7.17
140-160 42.7-48.8 0.11 2.49 1.43 9.86 2.36 16.30 0.72 4.96 1.19 8.21
160-180 48.8-54.9 0.12 2.71 1.60 11.00 2.53 17.40 0.80 5.52 1.27 8.76
180-200 54.9-61.0 0.17 3.85 1.75 12.10 2.93 20.20 0.88 6.07 1.47 10.14
14 in.
(350
mm)
0- 20
0 - 6.1 0.008 0.055 0.20 1.38 0.301 2.08 0.102 0.70 0.15 1.03
20- 40 6.1 -12.2 0.017 0.12 0.30 2.07 0.602 4.15 0.154 1.06 0.30 2.07
40- 60 12.2 -18.3 0.026 0.18 0.40 2.76 0.808 5.57 0.198 1.37 0.40 2.76
60- 80 18.3 -24.4 0.034 0.23 0.51 3.52 1.01 6.96 0.250 1.72 0.51 3.52
80- 100 24.4 -30.5 0.043 0.30 0.71 4.90 1.11 7.65 0.353 2.43 0.55 3.79
100-120 30.5-36.6 0.050 0.34 0.80 5.52 1.30 8.96 0.40 2.76 0.64 4.41
120-140 36.6-42.7 0.063 0.43 0.933 6.43 1.52 10.48 0.46 3.17 0.76 5.24
140-160 42.7-48.8 0.069 0.48 1.05 7.24 1.73 11.93 0.52 3.59 0.87 6.00
160-180 48.8-54.9 0.076 0.52 1.18 8.14 1.85 12.76 0.59 4.07 0.93 6.41
180-200 54.9-61.0 0.11 0.76 1.29 8.89 2.15 14.82 0.64 4.41 1.08 7.45
SIGNA Voyager Pre-Installation
Direction 5680008–1EN, Revision 2
Chapter 7 Appendix 175
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