A project that started as a college student’s study later resulted in the supply of four complete Taprogge Tube Cleaning systems for a power station in Stockholm. The systems are retrofitted on a district cooling plant which has been in operation for a long time, which caused a high deamnd on adapting to the present site conditions and space available. The plants which is used for district heating during winter time and as district cooling system during the summer months, has been struggling a long time with fouling inside the tubes of their tube heat exchangers and condenser units (1+1 per