100% Oil-free compressed air is used to drive a range of PIG (Pipeline Inspection Gauge) designs through pipelines.

• Cleaning
A PIG can be a simple cylindrical bung with a sponge coating or made from metal and fitted scrapers. This type is most commonly used to clean pipes to remove debris, material sediment and corrosion.

• Dewatering
After hydraulic pressure testing, a PIG is employed to remove all traces of water.

• Coating
A further application is to use one or more PIG units to line or coat the interior of a pipe. This calls for precise speed of operation, with compressed air acting on one side of the PIG to drive it with a counter pressure on its other side to control its progress through the pipe. This task calls for expert compressor operation, something Specialty Rental is able to provide.
Driving a PIG is the most common use of compressed air in the pipeline sector, we offer the largest fleet of 100% Oil-free Air compressors in the industry. Oil-free air is increasingly selected as it ensures no contamination of the pipe following cleaning and other work.