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Title: Multi-diameter, bi-directional pigging for pipeline pre-commissioning
Category: Pigsource Papers
Downloadable: Yes 
Project No.:
Research Agency:
Catalog No.: pg3509
Date of Publication: Feb 1 2010 12:00AM
Price: $25.00 US
Authors: Magne Andreas Vik, Alf Åge Kristiansen, Simon Sykes, Steve Hutcheson, and Dr Aidan O'Donoghue
Abstract: This paper examines the issues associated with multi-diameter, bi-directional pigging specifically for pipeline pre-commissioning. The technique can be used to flood and subsequently dewater a pipeline without the need for temporary subsea traps. An example is the Alve Pipeline in Norway. This 16 km flow-line from the Norne Platform to the Alve Manifold includes 10” and 12” pipe sections. The line was flooded from Norne using the pig with oxygen scavenged seawater and then dewatered using Nitrogen and produced gas from the well. The pigs needed to have a high sealing efficiency since very low velocities were used to flood the line and in order to avoid hydrates on dewatering. Multi-diameter wheel pigs were employed with non-buckling disc type seals. This paper describes the design of the pigs and the seals to achieve the required functionality. The test facility and testing performed to verify the pig performance is also illustrated. Finally, an overview of the offshore pigging operation is provided.
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