There are indications that contaminated washing water may cause incendive static electricity sparks. Washing should only be carried out because the tank atmosphere is well below LEL (lower explosive limit).Ĭheck during washing! Washing should be carried out under the inert gas atmosphere if cargo vapor concentration isĪbove LEL. Another cargo pump or stripping pumpĭrains the water back to the containment tank where the cargo residues can be removed by carefully drawing out the A cargo pump may serve as a washing pump withĭelivery to the washing line on deck, and then to the washing machines. The water may be further heated using heating coils. Gives a better utilization of the cleaning chemical a mixture of 5 - 50 tons of hot water with the recommendedĪmount of cleaning chemical is made in a cargo tank, a slop tank, a cofferdam, or a special tank for the purpose. Rinsing being sea or freshwater, depending on the product to be loaded. 1-2 hours of washing is usually to be recommended. High, and its full cleaning effect is not always utilized. The direct addition of cleaning chemicals to the washing water is quite common, but chemical consumption tends to be Method is more cumbersome in the latter case. But the dosage becomes less accurate, and the Sometimes, the cleaning chemical is added to the washing water pump's suction side, thus eliminating the need for a dosage pump. The cleaning chemical is injected into the washing water utilizing a dosage pump, usually air-driven, through aįitting attached to the deck's washing pipe. It is summarized below practical tank cleaning methods for various chemical cargo.Ĭleaning agent added directly to the washing water
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