Study into the feasibility of using dual-diameter pigs to pre-commission the planned Kvitebjørn pipeline. The pigs are also required to operationally pig the line, and to act as batching pigs for the inspection pigging of the line.
A base case dual-module pig was proposed for the job. Several challenges were addressed such as the compressible effect at the expansion between the two line sizes, design criteria for the connector between the two modules and wear/permanent set of the seals after negotiating the small-diameter pipeline.
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