Pipeline Pigging

Pigs are used for cleaning, dewatering, proving, gauging, isolating etc. and more than 350 different types are available.  The use of the correct pig with the correct procedures can make a very significant contribution to long term asset value.

For example, for optimum performance the bristles on a brush pig must be the correct stiffness for the pipeline.  If they are too stiff they will take on a permanent deformation in bends and will not touch the wall in straight pipe.  If they are not stiff enough they will not displace debris from the pipe wall.  

Another example concerns jetting pigs which rely on the differential pressure across the pig to drive the jet.  The differential pressure across a pig can be as low a 0.1 bar which is totally inadequate.

We review requirements and select the most suitable pig.  We also review existing pigs and advise on how well they are likely to perform.

Dewatering pipelines can be expensive and time consuming.  Inappropriate pigs and procedures can leave water in the line which has to be removed by drying.  Swabbing lines that are already dry can cause pigs to wear out and become lodged.

We review procedures with a view to reducing costs and eliminating difficulties.

Pigs occasionally become damaged or stuck.

We analyse pipelines, process conditions, and pigs to determine why pigs are damaged or stuck and make recommendations for recovery.  

In addition we write pigging procedures for new and existing pipelines.