as per normal practice, during the crude vacuum tower shutdown, Shuaiba Refinery can ont operate the isocracker and isomax due to shortage of feed stock. during the unscheduled shutdown of vacuum tower shuiaba refinery challened and mitigated the effect of this shutdown on the refinery performance and recieved processed the excess / stored MAB cracked vacuum gas oil and raw diesel and operated unit on cracked old feed for the first time