Don Field Decommissioning Programme (pdf, 7.8MB) null - BP

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Don Field Decommissioning ProgrammeDON-BP-001Don manifold physical data is as follows: Weight – 52 tonnes Height above seabed – 6000mm Footprint – 6400mm x 10,700mm Construction – Carbon steelFigure 4.6 Don ManifoldDescriptions of Items to be DecommissionedMay 2011 4-9
DON-BP-001Don Field Decommissioning Programme3 Pipelines, Flowlines and UmbilicalsFluid from each of the five Don subsea production wells was routed to the Don manifoldthrough 4in flowline jumpers. At the manifold, the fluids were commingled and flowed17.3km south through an 8in production pipeline (PL598) to Thistle, where the fluidswere processed. (Refer to Figure 4.7.)Note: Pipelines and umbilicals are shown untrenched for clarity.Figure 4.7 Don Field Pipeline System LayoutAn 8in water injection pipeline (PL599), which runs parallel to the production pipeline,supplied treated seawater from Thistle to the Don manifold. From the manifold, flowlinejumpers supplied treated seawater to the two water injection wells. A tie-in tee-pieceand protection frame are located 13.1km from Thistle.Both 8in production and water injection pipelines are insulated with a 13mm layer ofEthylene Propylene Diene Monomer (EPDM) and buried to reduce heat loss from thelines. Exposed sections of the pipelines are protected by flexiweight mattresses, groutformwork or rock dumping.A 4in electro-hydraulic control and monitoring umbilical (no DECC pipeline numberallocated), and a 3in chemical injection umbilical (PL600) follow a similar route fromThistle to the Don manifold. From the manifold, umbilical jumpers connected to theindividual wells. The chemical injection umbilical is blocked and was isolated in 1995.Figure 4.8 shows the final approaches of the pipelines and umbilicals at the Donmanifold. Each 8in pipeline connects to the manifold via a double spoolpiece.Descriptions of Items to be Decommissioned4-10 May 2011
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Don Field Decommissioning Programme (pdf, 7.8MB) null - BP

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