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The wire brush encircles the shaft and scours the interior of the pipeline. A scraper pig shown at the Trans-Alaska Pipeline System Visitors Center. In pipeline transportation, pigging is the practice of using pipeline inspection gauges or gadgets, devices generally referred to as pigs or scrapers, to perform various maintenance operations ...
Hydraulically activated pipeline pigging (HAPP) is a pigging technology applied for pipeline cleaning. The basic principle is that a pressure drop is created over a by-passable pig held back against a pipeline's fluid flow. The pipeline fluid passing through the pig's cleaning head is accelerated by this pressure drop, forming strong cleaning jets.
Pigging slugs are caused by pigging operations in the pipeline. The pig is designed to push all or most of the liquids contents of the pipeline to the outlet. This intentionally creates a liquid slug. Slugs formed by terrain slugging, hydrodynamic slugging or riser-based slugging are periodical in nature.
A pig is a tool that fits closely into the bore of a pipe and is driven along the inside of a pipeline by a pressure differential and used to perform a specific task for which it is specially designed. Pigging is done to inspect the bore, scrape off deposits, sediment or corrosion products, or separate two different product batches.
An intelligent pig, travelling at the prevailing gas velocity, measures the wall thickness of the pipeline and identifies areas of corrosion or defects. As the pipeline leaves the compressor station a pig launcher may be installed to send pigs down the pipeline to the next facility. [6]
Pig launcher. Pipeline pig launchers and receivers are provided with a pig signaller (XA) to indicate that a pig has been launched or has arrived. [4] Packaged items of equipment (compressors, diesel engines, electricity generators, etc) are fitted with local vendor supplied instrumentation. When equipment malfunctions a multivariable signal ...
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