(EnergyAsia, May 22, Tuesday) — Singapore Refining Company Private Limited (SRC) will invest US$81 million to revamp a hydro-sulphuriser unit at its 285,000 b/d refinery on Jurong Island to produce ultra-low sulphur diesel (ULSD) of Euro-IV specification.   SRC’s equal joint owners, Singapore Petroleum Company and US major Chevron, said last week they had awarded…