Case Study

Pipeline Replacement Study

Project description

ConocoPhillips (CoP) import crude oil through a 36” pipeline that runs from a Single Buoy Mooring (SBM) located in the Humber Estuary to a crude oil transfer terminal at Tetney. The pipeline was originally installed and commissioned in 1971. The pipeline runs from the terminal through flat agricultural land, over the seawall, through an environmentally sensitive salt marsh, under the Tetney High sands and the seabed to a pipeline end manifold (PLEM) located below the SBM.

CoP have identified a requirement to replace a section of the pipeline following pipeline integrity surveys and on this basis engaged PDi to undertake a feasibility study to investigate the replacement and decommissioning of the existing pipeline

Our Scope

The purpose of the feasibility study was to review the environmental, planning and consents required to progress the project, identify the construction options and to develop schedule and cost estimates for each scenario to replace and decommission a section of the Crude Import Pipeline.

The three scenarios investigated during the feasibility study were as follows;

  • Scenario 1 – Replace approximately 1km of the subsea pipeline from the PLEM
  • Scenario 2 – Replace approximately 4km of the subsea section up to the high-water mark
  • Scenario 3 – Replace approximately 6km of the subsea section and the onshore section up and behind the seawall
Client

ConocoPhillips

Location

Tetney Oil Terminal, Humberside, UK

Date

November 2011 (3 Months)

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