Uprating an In-Service Offshore Pipeline

by David G. Jones, British Gas plc, United Kingdom,
Glenn Nespeca, British Gas plc, United Kingdom,



Document Type: Proceeding Paper

Part of: Pipeline Design and Installation

Abstract:

The Ekofisk to Emden 36-inch pipeline, transmits gas 275 miles from the Ekofisk field to Emden, West Germany, and has been in operation since 1977. The operator Phillips Petroleum Company Norway (PPCoN) in cooperation with the owner Norpipe A/S has recently conducted extensive studies to evaluate the feasibility of increasing the capacity of the pipeline. This paper shows that it would be extremely costly to perform a hydrostatic re-test as the basis for uprating. The results of all the studies have been utilised by PPCoN/Norpipe as the basis for discussions with the Regulatory Authorities to approve uprating of the pipeline without the need to perform a hydrostatic re-test.

Subject Headings: Gas pipelines | Offshore pipelines | Underwater pipelines | Hydrostatics | Offshore structures | Feasibility studies | Cracking | Europe | Germany | Norway

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