Velocity Limitations - ABB Kent-Taylor AquaProbe Installation Manual

3.2.2 Velocity Limitations – Figs. 3.4 to 3.6
All insertion probe devices are susceptible to the vortex shedding effect which can cause severe vibration of the probe, resulting
in damage and/or measurement instability. Electromagnetic devices with no moving parts, such as AquaProbe, are less
susceptible to this effect than mechanical devices.
The graphs below show the maximum permissible velocities, depending the probe's location.
8 16
6.0
5.0
4.0
3.0
2.0
1.0
0
0 200
400
40 80
6.0
5.0
4.0
3.0
2.0
1.0
0
0 1000 2000
4
8
6.0
5.0
4.0
3.0
2.0
1.0
0
0 100 200
Fig. 3.6 Maximum Permissible Velocity for different Insertion Lengths
Pipe Size in inches
24 32 40 48 56
1000 1200 1400
600 800
Pipe Size in mm
Fig. 3.4 Maximum Permissible Velocity for different Pipe Sizes
Pipe Size in inches
120 160 200
3000 4000 5000 6000
Pipe Size in mm
Fig. 3.5 Maximum Permissible Velocity for different Pipe Sizes
Insertion Length in inches
16
12 20 24 28
300 400 500 600 700
Insertion Length in mm
3 MECHANICAL INSTALLATION
64 72 80
20.0
17.0
13.0
10.0
7.0
3.0
0
1600 1800 2000
240 280 320
20.0
17.0
13.0
10.0
7.0
3.0
0
7000 8000
32 36 40
20.0
17.0
13.0
10.0
7.0
3.0
0
800 900 1000
Centre Line Method
Mean Axial Velocity Method
( 1 ⁄ Diameter)
8
Traversing
5