20 PCM
+
Operation Manual
At a distance of about 3km (2 miles) from the transmitter,
two readings were obtained, 300mA on the new pipeline
and 100mA on the old pipeline. The PCM current arrows
pointed towards the PCM Tx indicating that somewhere
within the 3km/2 miles the new pipeline had been bonded
to the old pipeline.
The Tx was then connected to the other end of the new
pipeline and measurements taken at exactly the same
positions. A reading of 800mA was detected on the new
pipe, but there was no reading on the old pipeline.
As a series of readings were taken on both pipelines
closer to the point of bonding, current appeared on both
pipelines and with the arrows in opposite direction. This
indicated that the bonding point was further ahead.
The point of bonding was located, and a measurement of
500mA, concluded that the other faults existed closer to
the rectier.
Figure 6.8: Parallel Pipes Example 4
Figure 6.9: Parallel Pipes Example 5
To Next Page
Loading...
Need help?
General
