The estimated $200 million-300 million project covers the construction of a diesel hydrocracker, hydrogen processing unit, sulphur recovery and sour water treatment units.

A source close to the project tells MEED that ABB has started work on the EPCM part of the project in the past six weeks, although it has not been tendered separately.

Sasref, a 50:50 joint venture of Saudi Aramco and the Royal Dutch/Shell Group, operates the 305,000-barrel-a-day refinery, which receives Arabian light crude from Aramco.