The unit has a capacity to distill 200,000 barrels of crude-per-day was closed for maintenance for 40 days and has resumed operations just two weeks ago.
PetroChina has set up a team to undertake the clean-up process so as to avoid other secondary disasters.
The Dalian refinery has three crude distillation units with a combined crude processing capacity of 410,000 bpd, reports Reuters.
The refinery was planning to increase its output in July to 317,900 bpd up 63% from 194,670 bpd in June, after the maintenance of the distillation unit.
