Testing eliminates crude line PPD use

Solution gases and reservoir pressure can allow operation of offshore transmission pipelines carrying high pour point, paraffinic crude without pour point depressant (PPD), even during periods of prolonged shutdown. Eliminating use of PPD leads to operational savings.This article uses the Mumbai High-Uran pipeline offshore India to demonstrate the viability of operating such systems without PPD.BackgroundMumbai High-Uran subsea crude oil trunkline (BUT) is a 30-in. OD, 203 km pipeline carrying Mumbai High crude oil to the Uran onshore terminus (Fig 1). The pipeline is buried and insulated and was commissioned in 1979. Recent data allow a reexamination of the salient aspects of its operati...

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