Lack of control of the environment is often pinpointed as a cause of frustration and stress in confined animals. When the animal cannot control things, such as the feeding time or the lighting program, and when it cannot escape from things it finds unpleasant, it often behaves in a manner that indicates frustration.
Cavitation can also cause excessive pump vibration, which could damage pump bearings, wearing rings, and seals. A small number of centrifugal pumps are designed to operate under conditions where cavitation is unavoidable.
The main factors that affect the flow rate of a centrifugal pump are: - friction, which depends on the length of pipe and the diameter. - static head, which depends on the difference of the pipe end discharge height vs. the suction tank fluid surface height. - fluid viscosity, if the fluid is different than water.