Description: Language-independent identification of a class that is unique within a classification system; Name: class code
Description: language-independent, unambiguous code of a class within a class system; Name: code of class
Description: Speed that characterizes a pump in terms of its speed, flow rate per impeller eye, i.e. total flow for single-flow impeller, half flow for double-flow impeller, at the best efficiency point and head per stage at maximum impeller diameter ; Name: Specific speed