Saudi Aramco has completed maintenance on a 305,000 barrels per day (bpd) refinery in Jubail on the Gulf coast, Reuters has reported, citing traders. The refinery, which is jointly owned by Aramco and Royal Dutch Shell, was back online after maintenance lasted for about one month, the traders said. The state-owned company said it also raised its fully-owned Yanbu refinery capacity to 250,000 barrels per day and upgraded its crude tower trays as part of a total revamp to improve the diesel quality after a 38-day turnaround.