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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. This is done without stopping the flow of the product in the pipeline.
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.
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 pigs when they passed through the lines to clean them using methods such as scraping, scrubbing and "squeegeeing" the internal surface.
Robotic non-destructive testing (NDT) is a method of inspection used to assess the structural integrity of petroleum, natural gas, and water installations. Crawler-based robotic tools are commonly used for in-line inspection (ILI) applications in pipelines that cannot be inspected using traditional intelligent pigging tools (or unpiggable pipelines).
Portions of the San Bruno pipeline had been built in 1956. In ideal situations, pipeline inspection gauges or a “PIG” (see Pigging) is used to inspect and ensure the safe operation of natural gas pipelines. About 63 percent of all natural gas pipelines in the US cannot be properly inspected using a PIG, or automatic robot in the pipes ...
The city's water line inspection process and results so far Amarillo is inspecting all 79,000 water service lines in the city. So far, 20,000 physical inspections have been conducted, with no lead ...
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