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Title: Columbia Gas - practices and experiences using MFL pigs for corrosion
Category: Pigsource Papers
Downloadable: Yes 
Project No.:
Research Agency:
Catalog No.: pg3250e
Date of Publication: 1996
Price: $25.00 US
Authors: Terry Shamblin
Abstract: A large portion of Columbia Transmission's pipeline system was constructed in the 1940s and 1950s when line coating and cathodic protection (CP) practices were not at current standards. Many of these vintage lines have had CP added. Some have been recoated, replaced, or rehabilitated. But, as with any modern pipeline system, there is continual growth and development on and around the lines, in addition to normal maintenance concerns, which create the need for periodic evaluations of pipeline integrity. With rising construction and replacement costs, and the environmental costs of dealing with the water generated from hydrostatic testing these existing lines, MFL pigging became a viable tool for verifying pipeline integrity. Columbia realized that there were many factors to consider when choosing a pipeline to inspect with an MFL pig.
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