DUBAI, June 6 (Reuters) - Saudi Arabia's PetroRabigh 2380.SE said on Monday it had awarded a construction contract for its Rabigh II expansion project to Italian oil service group Saipem SPMI.MI .

PetroRabigh, a joint venture between Saudi Aramco IPO-ARM.SE and Japan's Sumitomo Chemical 4005.T , said the total cost of the 30-month contract to expand its petrochemicals complex was 782 million Saudi riyals ($208.5 million).

The contract includes a plant to process and recover vanadium and a unit to dispose of caustic soda.

The contract also includes some other facilities to handle and store chemicals, a statement from the firm said.

The Rabigh II expansion project inlcuded an expansion of an existing ethane cracker and a new aromatics complex to process more than 2.7 million tonnes of naphtha a year to make higher-value petrochemical products.

($1 = 3.7499 riyals)

(Reporting by Maha El Dahan; editing by Adrian Croft) ((Maha.Dahan@thomsonreuters.com; + 9712 4082101; Reuters Messaging: maha.dahan.thomsonreuters.com@reuters.net))