Case Study

Pipeline Replacement Study

Project description

Crude oil is imported through a 36” pipeline that runs from a Single Buoy Mooring to a crude oil transfer terminal. The pipeline was originally installed and commissioned in 1971. The pipeline runs from the terminal through flat agricultural land, through an environmentally sensitive salt marsh, under the sands and seabed to a pipeline end manifold located below the Single Buoy Mooring.

Following pipeline integrity surveys, a requirement to replace a section of the pipeline was identified. PDi were engaged 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
Timing and Duration

Commenced November 2011 (Duration 3 Months)

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