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Title: Progressive pipeline pigging for deposit removal
Category: Pigsource Papers
Downloadable: Yes 
Project No.:
Research Agency:
Catalog No.: pg3158e
Date of Publication: 1993
Price: $25.00 US
Authors: Edgar J Dewar
Abstract: Removal of large amounts of solids, such as wax, sand and corrosion products, accumulated in a pipeline must be done carefully to avoid completely plugging the pipeline. Similarly, starting a pigging program in any old unpigged pipeline should be done cautiously to avoid surprises. Atlantic Richfield Indonesia Inc (ARII) has successfully used progressive pigging procedures in cleaning such pipelines. These consists of an initial very-soft foam pig (pillow) followed by a series of progressively more rigid and/or larger pigs until the pipeline is clean and a standard maintenance pig can be used. Gel pigs are also a part of the series. This paper describes the basics of the progressive pigging procedures used at ARII and several examples from our Java Sea oilfield. This paper also discusses ARII's experience in cleaning old sub-sea crude oil pipelines with progressive pigging techniques. The principles apply to any pipeline with similar problems.
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