Closed recirculating systems are used for both heating and cooling in a number of industrial and commercial applications. Because these systems are considered “closed” to the outside air, there is very little make-up required. Typically less than 10% make-up per year is considered a tight system. The main concern for closed loops is corrosion.
Corrosion inhibitors are designed to form a magnetite protective layer on the mild steel system piping protecting it from corrosion. Yellow metal corrosion inhibitors are also essential to protect valves, fittings and monitoring equipment found in closed loops.
Objectives of THE closed system water treatment programs are:
To keep heat transfer equipment as clean as possible in order to maximize water flow and heat transfer efficiency, and to protect the equipment and associated piping from corrosion deposition and microbiological contamination.
To conserve water and heat, reduce fuel and power consumption, and to meet or surpass all applicable environment and water quality regulations.
_