ABSTRACT
Chemical process pumping involves the handling of liquids that are corrosive or toxic or both. Liquid properties influence the type of pump and its mechanical construction. Most liquids pumped are solutions of multiple constituents. To help insure the most appropriate materials are used for the pump, it is necessary to know the liquid’s constituents and their concentration. Pollution, both atmospheric and ground, known carcinogenic effects, and high toxicity dictate that many of the liquids used in the chemical industry be allowed to leak at only very low rates or not at all. In low concentrations, often seemingly innocuous, solids suspended in the pumped liquid can cause corrosion-erosion. Frequently, the damage can be severe enough to result in premature, catastrophic failure of a pump’s casing. If solids are likely to be present, their material, size, and concentration need to be specified.
