AfricaS.Africa's Engen refinery to be converted into a storage terminal Reuters 2 minutes read A security officer patrols the entrance to the Engen refinery in Durban, file. REUTERS/Rogan Ward South Africa's oldest crude oil refinery, the 120,000 barrel per day plant operated by Engen (Enref), will be converted into a new storage facility because the refinery is no longer sustainable in the long term, the company said on Friday. The refinery, situated on the eastern coast in the city of Durban, has been shut down since a fire in December damaged the plant that supplies around 17% of the country's fuel production and is South Africa's second largest crude refinery.