Decommissioning and abandonment

Decommissioning and abandonment

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BRUSH PIGS

ƒ Removal of scale, rust, dust (gas) and wax

Brush pigs are used for removing scale, rust, dust and wax from the pipe wall. By-pass ports are used to produce flow in front of the pig. This flow helps prevent the build-up of debris or wax in-front of the pig. By-pass ports are typically threaded holes with plugs. The operator can therefore adjust how much by-pass occurs.

SCRAPERPIGS

SCRAPER PIGS

ƒ Polyurethane or steel blades or ploughs ƒ Wax removal ƒ Disposal of wax-loosening chemicals

Scraper pigs are used for the removal of heavy wax deposits from the pipe wall. If chemicals are used to loosen the wax first, then there must be tanks to separate and recover them for safe disposal.