AQUASCAN 610
16/41
Version 1.1
The result below shows the peak has been removed and the distance
from A & B has changed;
Fig. 17 Peak Suppression result
4.5.3. Velocity Check
The correct sound velocity is very important for the precision of the leak
location result. The nearer the leak is to one of the sensors creates a
large time delay, the more important the velocity value as during the
mathematical correlation process a greater error will occur. It is very
important to understand that the sound velocity table, defined by pipe
material and diameter, is only theoretic and that the specific real
velocity might differ from site to site. We recommend that whenever the
measurement shows a leak position which is not in the middle third
section of the total distance between sensors A and B, the real on-site
sound velocity should be verified. This can only be done when the pipe
material to be verified is homogeneous, i.e. is a single material and
diameter.
For this velocity check we can either use the real leak itself, by moving
both sensors to one side of the leak, or we can simulate a leak i.e. by
opening a hydrant or a valve. In this case we simulate the leak outside
of the pipe section we are measuring (that means that both sensors are
on one side of the leak).
First, enter the distance between sensor A & B with
or
. Confirm
with
;
