Page 240 - Pipeline Pigging Technology

Foam pigs

SUMMARY

Each pig design has unique characteristics that make it the pig of cnuice
for a particular pipeline problem, but no pig design is suitable for every
application. When a pipeline operator prepares for a pigging project, he must
consider the design restrictions of his system, define the type of results he
expects the pig to accomplish, and calculate the risks he will be facing. It is
to his advantage to have a "tool box" full of different pig designs so that he may
have several options in the choice for the proper pig to accomplish the job
efficiently and safely.
The polly pig offers the pipeline operator the widest choice of designs to
deal with the majority of pipeline pigging problems he will encounter.
Flexibility, the pig's built-in safety factor, allows it to negotiate short-radius
bends, pipe diameter reductions, and other pigging hazards that might cause
other designs of conventional pigs to become plugged in a line. In short, the
polly pig, with its wide range of possible configurations, is the most versatile
pig available to the pipeline operator today.

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