Underground Diesel Tank Cleaning - London With all the health and safety in place and wearing the right PPE for the job, we carried out the cleaning of two underground diesel storage tanks. Our client had run down the tanks to virtually empty, making ready for us to open the tanks and pump out the residue. Project Linings' operatives safely accessed the tanks and washed down the internal surfaces with specialist detergents. All the dirty diesel and washings were removed from the tanks and safely disposed of, off site. Both tanks were opened, cleaned, closed, refilled and put back on line the same day.