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The selection of a special metal for a specific tank solution is obviously important. However, with so many proprietary solutions on the market, it might be advisable to consult with the supplier of these chemicals and follow their recommendations. Corrosion caused by stray currents is a common problem encountered on in-tank heat exchanger. This problem can often be eliminated by preventing metal-to-metal contact inside a tank and installing di-electric couplings on coil inlet and outlet connectors. Unintended changes in the concentration of the chemical solution inside the tank can, under certain circumstances, result in severe corrosion. Overcoming this problem requires close monitoring of the solution. Ensure that the solution inside the tank is in constant movement with the use of agitators or through the [word?] of parts being treated. In-tank heat exchangers manufactured using solid metal sheets can easily separate one part of the tank from the other small and restricted areas. This separation can cause concentration level of corrosive chemicals to rise. Grid coils prevent this problem. Through their design, they enhance heat transfer, and also promote free circulation of liquid inside tanks. Therefore, they are subject to less corrosion than other in-tank heat exchangers. Often corrosion occurs on the inlet and outlet tubes where they break through the surface of a liquid. Liquid boiling cause chemicals to concentrate at these points. Prevent this problem by installing insulating sleeves at critical points. These sleeves are larger diameter tubes placed over the inlet and outlet tubes, at the surface of the liquid, and hermetically sealed on both ends. The air insulation prevents the solution from boiling at the point where the tube breaks through the surface of the liquid.
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