Case study no. 17:
Phosphating
Initial situation
If base materials are to be phosphatized, the tanks must be tempered. During this reaction, a strong crystallization reaction takes place on the heat exchangers. For this reason, external stainless steel exchangers for heating or cooling the bath are not required. However, every type of internal exchanger has similar caking during operation. Depending on the degree of soiling, these can only be removed by knocking off the deposits.
Task definition
An internal exchanger made of stainless steel has turned into a large lump of stone after prolonged operation in a phosphating tank. The exchanger cannot be used again even if the phosphate is cleaned by mining, i.e. by knocking it off with a great deal of force. A solution is sought that keeps crystallization to a minimum and at the same time simplifies cleaning.
Solution
Due to the chemical and thermal properties of phosphating, caking of the phosphate cannot be avoided. However, Calorplast offers stainless steel exchangers that slow down caking and make cleaning easier by cleverly switching the pipes and using special pipes.
Result
Classic curved exchangers, which are very favorably designed and constructed, have already been replaced several times by Calorplast stainless steel exchangers have been replaced. The customer saves on additional maintenance intervals and at the same time has a product with a long life expectancy.
