3-5
April 2004
Preparing the Pipe
1. Locate a transducer measurement point with 20 diameters of
upstream straight run pipe and 10 d ia meters of downstream
straight run pipe. In addition, the point should be at least 10
diameters from any butt welds or flanges. Keep appropriate
clearance on either side of the pipe for easy transducer
installation:
•150 mm (6 in.) if you are not using a junction box, or
•225 mm (9 in.) if you are using a junction box.
In general, transducers are installed 180° apart on opposite sides
of the pipe and in a horizontal plane (at 3 and 9 o’clock). Figure
3-3 below illustrates the desired acoustic signal projection path
for general installation; however, additional pipe surveys may
provide data that can lead to modifications for optimal
installation.
Figure 3-3: Desired Projection of Acoustical Signal
Path
Transducer Transducer
Pipe
Signal Path
End View