Chemical heat-exchanging equipment cleaning is a processing of its inner surfaces using special sediments destructing chemical agents. This cleaning method is characterised by high efficiency along winth economical profitability.
A lot of different chemicals can be used to perform a chemical cleaning procedure. These are hydrochloric, sulfuric, sulfamic, oxalic, lemon and onther acids, complexons of different compositions, derivatives of phosphonic acids and inhibiting agents preventing corroding effect on the materials of surfaces being cleaned. All these agents have their peculiarities, and, as sediments are compound matters, as a rule it's impossible to be lmited to a single agent. Proper formula choice is the most important aspect that influences the cleaning quality.
In general the technology of chemical cleaning consists of four steps: preprational step, the very cleaning, water washing and the passivation of cleaned surfaces. Prepartional step includes connecting the chemical cleaning equipment to an object being cleaned, pressuring the system with water and checking the circulation within all the cleaning contours. The very cleaning step is a processing the surfaces with chemical agents, dosed under control of pH, temperature, RedOx potential and percentage of agent in a washing solution. On completion of this step the remains of the agents are neutralized and the systhem is being washed with water. The cleaned surfaces are then passivated with special chemical agents to prevent the secondary corrosion.