Rotajet Systems Limited has recently designed, manufactured and installed a large tunnel wash system for washing out 60 litre, 120 litre and 240 litre open top barrels which had previously contained used cooking oil. The drums are loaded onto a 4 wide tracked belt and are steamed, caustic washed, water rinsed and final water rinsed both inside and outside. The machine is fully enclosed and the operations are controlled via a PLC fitted with HMI, once processed the barrels exit the washer and are transferred to a powered roller track which feeds a pallet packing area. The internal sumps of the machine is steam heated and the used washing liquors are reused and recycled , the final water rinse is automatically monitored for pH level and adjusted accordingly. The drum washing system washes between 800 and 1200 barrels and drum per shift.