WHAT IS SCALE OR SCALING PROCESS?
It has known that these two salts, calcium and magnesium are responsible for much of scale because they precipitate out of water more readily than other minerals such as sodium salts. These precipitates are held in aqueous suspension and when subjected to the normal temperature changes and pressure changes which accelerates the clustering of these suspended molecules. When the cluster achieves a size larger than that which can be maintained in suspension, the scaling process is initiated. In a pipe or tubing, the fluid velocity is greater in the center than close to the wall. The natural tendency for scale deposits to form is where the velocity of the fluid is lower so scale forms on the wall of pipes and lower velocity surfaces of heat exchangers for these reasons.
