Under the contract, which is expected to last 12 months, Worley-Parsons will assess potential products and plant capacity, as well as whether the complex will require a new ethylene cracker.

The study will also consider the option of integrating the Ruwais complex with the planned GCC railway network.

Borouge announced its plans to expand in April. The company, a joint venture of Abu Dhabi National Oil Company (Adnoc) and Vienna-based Borealis, already has a $5bn, second-phase expansion under construction that will double its capacity to more than 2 million tonnes a year (t/y).

Under the third phase, which is due to be completed by 2014, Borouge will add a further 2.5 million t/y of capacity (MEED 11:5:08).