Oman-based Oman Oil Refineries and Petroleum Industries (Orpic) has shut-in its Sohar oil refinery following a cooling pipe burst.
Reuters cited Orpic spokesman as saying that the repair work is likely to take another week.
The refinery is capable of processing 116,000 barrels per day of Omani crude.
"There was a breach in an incoming seawater cooling pipe. Obviously if that happens we have to shut down operations," the spokesman said confirming traders’ talk of an outage.
"Operations of the refinery have been shut since Tuesday."
The refinery started full production in March 2007, six months later than scheduled due to start-up snags.
Around 950,000 barrels per day of crude is being pumped by Oman aimed to maintain this level for the next two to three years.