Overview A large bitumen producer asked Harpers Environmental Ltd to provide a safe solution to a tough cleaning problem in one of their large storage tanks. They asked Harpers to dene and implement a compliant method for removing an accumulated overhead layer of carbonised bitumen. These deposits were posing a hazard for their personnel and were preventing the routine cleaning of the tank. There were 20 bitumen tanks of similar size on this site, each holding dierent grades of bitumen. The tanks represented an on-going issue for the company. The tanks were all approximately 38’ by 25’ holding between 150-250 tons of bitumen each, all the tanks were heated to between 190 – 220 Deg. C. Solution Harpers technicians believed and ultimately demonstrated that the problem could be resolved usi

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