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Title: Predicting the performance of conventional pigs
Category: Pigsource Papers
Downloadable: Yes 
Project No.:
Research Agency:
Catalog No.: pg3089e
Date of Publication: 1992
Price: $25.00 US
Authors: J Gerry McNulty, Gordon C Short and David A Russell
Abstract: Predicting the performance of pigs for critical operations is a major challenge for manufacturers, suppliers and users alike. New and risky processes require greater assurance that the optimum pig design is available to function effectively, whether it be, for example, dewatering or cleaning, coating, or inhibitor laydown. At the same time, legislation is being brought into place both in the United States and Europe that will require more formal assessment of pigging operations and their effectiveness from operators.

CALtec Ltd, the oil and gas division of the BHR Group, recognized the changing and more-demanding needs of both pig users and regulatory authorities, especially those involved in offshore oil and gas operations. To meet these needs, it launched a three-year research programme to investigate industry practices in the field of conventional pipeline pigging operations. The first phase of this programme, which has recently been completed, was to identify the current state-of-the-art in the design, selection, performance and utilization of conventional pigs (including foam pigs, gel pigs and spheres) used for separating, swabbing, de-watering, filling, cleaning, batching, gauging and other functions.

The work has resulted in a clearer understanding of what the current industry practices are, their benefits and limitations. The first phase of the project made clear recommendations on issues that must be tackled to improve pipeline pigging technology. This paper explores these, and describes the way forward for the pigging industry.

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