Locating - CDI CD42-STS User Manual

CD42-STS Subsea Diver/ROV Pig Location and Tracking System
TRACKING/LOCATING (cont.)
Locating a Stationary Pig
Locating a stuck pig in a pipeline is one of the most useful features of
the CD42-STS. The best way to minimize the amount of searching for a
stuck pig is to properly track the pig in the pipeline so that when and if
it does become stuck, the amount of pipeline in which it could be is at a
minimum.
If the last confirmed tracking location is known, all the operator has to
do to locate a stuck pig is back-track the pipeline until the receiver reads
the signal.
To locate a stationary
pig, the diver or ROV
operator moves along
the pipeline with the
antenna held parallel
to the pipeline.
The peak signal indicator will shift right as the operator approaches the
stuck pig. If the peak signal starts to diminish in strength (peaks start
falling toward the left) the operator has passed the stuck pig.
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