Process modelling services at a refinery Oil and Gas Case Study ABB Consulting was approached by the operator of an oil refinery to provide options for a major plant upgrade and product spec change for a hydro- desulphurisation plant. The upgrade project needed to be completed in time for the scheduled major shutdown in 10 months time. An existing Hysys model of the HDS plant existed but the originator had moved on, leaving a complex b

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