The Chinese government has made it mandatory for all Chinese oil refiners to use the automated cleaning technology to protect the safety of workers.

This Japanese technology is able to recover 2900 cubic meters of this sludge (more than 95%), which is a substantial improvement over recovery using manual labor, according to the company.

Oil sludge is caused by oil solidifying or gelling in a storage tank and it is often caused by an excess of water in the oil, and can cause major problems in oil storage tanks if not cleaned regularly.

Currently, most Chinese oil refiners still use a manual cleaning process which greatly endangers the safety of workers.