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GWA – High Differential Pressure Plug Assessment

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GWA – High Differential Pressure Plug Assessment

Benefits

Atteris performed an engineering assessment for determining the allowable differential pressure across a high differential pressure plug (HDPP), based on the pipe wall utilisation acceptance criteria specified in DNVGL-RP-F113. This assessment determined that, due to interaction effects with the adjacent test plug, the previously assumed maximum isolation pressure was not achievable. Early detection of this pressure constraint issue allowed Woodside to plan accordingly and thus avoid late changes to the project which would have incurred additional cost and schedule impacts.

Background

The Riser Emergency Shutdown Valve (RESDV) of the Goodwyn Alpha (GWA) Export Riser on the GWA platform required replacement. Woodside Energy Ltd (WEL) planned to utilise a High Differential Pressure Plug (HDPP) to isolate the GWA Export Riser for the RESDV replacement.

Work Performed by Atteris

Atteris initially performed global analyses of the HDPP set location to determine the global behaviour of the pipe and the associated global loads to be applied to the detailed local model. Once these global loads were defined Atteris performed local analyses of the pipe, subjecting it to local loads from the isolation plug(s) and global loads from the global analyses, to determine the allowable differential pressure for the isolation and leak test conditions.

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