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Displaying records 163 through 163 of 2180
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Title: Air Drying Gas Pipelines
Category: Pigsource Papers
Downloadable: No
Catalog No.: pg1034e
Date of Publication: not available
Price: $25.00 US
Authors: Christian Falck, Beate Kristiansen, and Brynjar Laksa
Abstract: Following hydrostatic testing of a dry gas pipeline, it is necessary to remove all water prior to introduction of gas.This in order to meet the gas quality specifications and to avoid hydrate formation when hydrocarbon gas is introduced. This is normally achieved by performing a bulk dewatering operation, followed by a drying operation. The pipeline is dewatered by propelling a train of mechanical pigs through the line with compressed air or gas. The residual water is removed by continued purging by dry air. Traditionally, a number of swabbing pigs or foam pigs are also propelled through the line during the purging operation to enhance the drying. However, use of swabbing pigs requires back pressure in the line which has a schedule and cost impact for longer pipelines.This paper describes the drying of long pipelines by the dry air purging method, and compares a transient finite volume simulation with actual field data for three major North Sea gas export pipelines.
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