Pipeline pig FAQs, use and results
Pipeline pigging
is a method used all around the US and the rest of the world as an effective
method of cleaning, inspecting and maintaining industrial pipes. While pipeline
pigging offers the advantage of not interrupting production processes, it can
be a high-risk procedure, unless it is facilitated by a qualified operator.
Any type of
pipeline pigging requires extensive planning, and professional assistance for
either the pig manufacturers or a qualified pipeline cleaning service company.
The key to safe operation is to eliminate or at least minimize ILI tool sensor
liftoff. Proper application ensures maximum results for companies, whether they
require mechanical dry pigging or liquid pipeline pigging with mechanical pigs.
The process
involves launcher and receiving station, which is generally a vessel that is
connected parallel to the pipeline that will be cleaned or inspected. This
method enables the operator to launch and receive the pipeline pig,
using the normal operating pressure of the pipeline to propel it forward
without stopping production or interrupting the flow of the liquid product.
The launcher
or receiver vessel has a closure door for safe operation, and the process
involves a sequence of valve operations combined with opening and closing of
the door. A mistake during this operation could have dire consequences.
Pipeline Pigging Launcher and Receiver Station Operation
Safe
operation of the pipeline pigging closure door requires that the operator
follows certain safety procedures before opening the closure:
1.
Drain and depressurize the vessel.
2.
Isolate the vessel from the process pipeline.
3.
If drain systems or vent headers are present,
the vessel must first be isolated.
4.
The vessel should not contain any toxic
gasses, such as H2S.
5.
The vessel must be isolated when the door is
open.
6.
The closure must be shut tightly before the
launching or receiving process commences.
Production
may be interrupted if the throttle is not opened fully before the operator
isolates the launcher or receiver station and that's why it is so important to
prevent opening the doors when the system is under pressure.
Pipeline
pigging inspections ensure that your system is operating as it should. The pig
will measure a range of variables from the inside, including the volume,
pressure and wall thickness. Again, this process should be handled by a
professional pipeline
pigging operator who is trained to administer the pig and interpret the
results.
When buying
a pipeline pigging system, be sure to deal with a reputable ILI company who is
able to offer the support needed for best results.
References
Drinkwater Products: Pipeline Pigs, Pikotek
Gaskets, Pipeline
Pigging
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