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Title: Dynamics Of Pig Motion In Gas Pipelines
Author: K.K. Botros, H. Golshan
Source: American Gas Association 2009
Year Published: 2009
Abstract: Movements of pigs in gas pipelines are subject to more stringent parameters than that in liquid pipelines, predominantly due to the compressibility of gas. This is accentuated when the pig has to negotiate an upward inclination in the section of the pipeline, where the gravity force due to its weight can compromise the driving pressure drop across it. This could lead to the pig getting stuck in the line at certain condition, and cause interruption to the operation of the system. On a downward slope, a pig can accelerate to a velocity higher than the maximum required for the proper operation the instrumentation (which is typically around 5 m/s). The ability to accurately predict the functional performance of pigs is vital in the design and operation of pipelines and their associated pigging programs. Models and tools have been developed over the past several years based on a combination of mechanistic, correlation and phenomenological approaches.

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