Download Optima MR450w Preinstallation Manual

Optima MR450w Preinstallation Manual
Direction 5670001, Revision 3.0
GE Healthcare
Inside
dia. of
vent
pipe (D)
Distance of vent system
component from magnet
ft
16 in.
(406.4
mm)
m
Pressure drop for
straight pipe with
smooth inside sur‐
face
psi/ft
Pressure Drop Per Elbow Used Anywhere Within A 20 Ft (6.1 M) Vent Segment
Standard Sweep
Std sweep 45° el‐
bow (K = 15 Ft)
kPa/m
psi
kPa
Long Sweep
Std sweep 90° el‐ Long sweep 45° el‐ Long sweep 90° el‐
bow (K = 30Ft)
bow (K = 7.5Ft)
bow (K = 15 Ft)
psi
kPa
psi
kPa
psi
kPa
0- 20
0 - 6.1
0.0053
0.037
0.153
1.05
0.230
1.59
0.078
0.54
0.115
0.79
20- 40
6.1 -12.2
0.013
0.09
0.229
1.58
0.460
3.17
0.118
0.81
0.229
1.58
40- 60
12.2- 18.3
0.020
0.14
0.306
2.11
0.618
4.26
0.152
1.05
0.306
2.11
60- 80
18.3 -24.4
0.026
0.18
0.390
2.69
0.773
5.33
0.191
1.32
0.390
2.69
80- 100
24.4 -30.5
0.033
0.23
0.543
3.74
0.850
5.86
0.270
1.86
0.421
2.90
100-120
30.5-36.6
0.038
0.26
0.613
4.23
0.995
6.86
0.310
2.14
0.490
3.38
120-140
36.6-42.7
0.048
0.33
0.714
4.92
1.16
8.00
0.352
2.43
0.581
4.01
140-160
42.7-48.8
0.052
0.36
0.803
5.54
1.32
9.10
0.398
2.74
0.666
4.59
160-180
48.8-54.9
0.058
0.40
0.903
6.23
1.42
9.79
0.451
3.11
0.712
4.91
180-200
54.9-61.0
0.084
0.56
0.987
6.81
1.64
11.31
0.490
3.38
0.826
5.70
Notes
1. Elbows with angles greater than 90° must not be used.
2.
156
The table data is based on the followings:
a.
Initial flow conditions at magnet interface
b.
Gas temperature starting at 4.5 Kelvin (-452° F or -268°C).
c.
Helium gas flow rate of 2,737 cubic feet per minute (77.5 cubic meters per minute)
d.
45° standard sweep elbow K = 15 Ft
e.
90° standard sweep elbow K = 30 Ft
f.
45° long sweep elbow K = 7.5 Ft
g.
90° long sweep elbow K = 15 Ft
8 Magnet Cryogenic Venting Pressure Drop Reference Tables