Pig is an acronym for Pipeline Inspection Gauge. Pigging is an in-line inspection (ILI) method in which devices known as “pigs” are inserted into pipelines to clean and/or inspect the pipeline. The main benefits of pigging a pipeline are to clear the line of debris and also to gather information about the pipeline. The user then uses this information to map out defects to aid repair crews in maintenance. Types of pigs a. Utility pigs: used to clean rubbish/debris from the pipeline or to seal the pipeline b. Inspection pigs: used to gather data/ information such as pipeline's diameter, curvature, bends, temperature, anomalies on the pipe internal wall, metal loss, general corrosion, erosion corrosion, pitting, weld anomalies, hydrogen induced cracking, the presence and location of corrosion. Smart pig is an example. Two methods used for inspection are: i. Magnetic flux leakage (MFL) – sends magnetic flux into the pipe walls for leak, corrosion
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