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Title: Pigging velocities and the variable-speed pig
Category: Pigsource Papers
Downloadable: Yes 
Project No.:
Research Agency:
Catalog No.: pg3093e
Date of Publication: 1992
Price: $25.00 US
Authors: Gary L Smith
Abstract: Technology in the pigging industry has come a long way since burlap bags wrapped with tie wire was considered a 'state-of-the-art' pig. Today we have new-age cleaning pigs which utilize modern wear-part materials, and intelligent pigs which carry on-board computers and guidance systems.

The trend in the industry today is to fine-tune routine pigging procedures and use high technology to inspect and analyze the structural conditions of pipelines. This is aimed at maximizing the operating efficiency of pipelines, and to safely extend their useful life. One aspect of pigging which is sometimes overlooked is the speed at which a pig travels and the effect that speed has over the efficiency of the pig run, especially at high velocities. Reducing the flow of product to reduce pig speed can be inconvenient and expensive. The use of fixed by-pass ports in cups, discs or through pig bodies is common, but the results are inconsistent and not predictable. Efforts are now being made to design pigging equipment which can consistently operate independently of normal pipeline flow.

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