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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.
In some cases, the pig is removed from the pipeline via the receiver at the end of each run. [9] All systems must allow for the receipt of pigs at the launcher, as blockages in the pipeline may require the pigs to be pushed back to the launcher. Many systems are designed to pig the pipeline in either direction.
Ice pigging is a technique used for cleaning pipes, distinguished from traditional pigging by the use of a semi-solid 'pig' made of ice, rather than a solid object. This ice pig is capable of flowing through pipes, navigating obstructions such as valves and variations in pipe diameter, due to its fluid-like properties.
Background and origin of the term "pig": In the field, a device that travels inside a pipeline to clean or inspect it is typically known as a pig. PIG is a bacronym for "Pipeline Inspection Gauge". The acronym PIG came later as the nickname for "pig" originated from cleaning pigs (first designed pigs) that sounded like squealing or screeching ...
Pipeline Filling (Flooding) – which can be carried out by propelling pigs through the pipeline with water or free flooding with water (normally for smaller or unpiggable pipelines). Hydrotesting – this is a process by which the pipeline in question is pressure tested to a predefined pressure above the operating design pressure of the pipeline.
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The spill originated from a 0.25-inch (0.64 cm) hole in a 34-inch (86 cm) diameter pipeline. The pipeline was decommissioned and later replaced with a 20-inch (51 cm) diameter pipeline with its own pipeline inspection gauge (pig) launch and recovery sites for easier inspection. [2]
Image credits: LittlestSlipper55 When you look around, you might be surprised how many things have names that can really mislead you. Take guinea pigs, for example.