Growing environmental legislation is changing needs and causing operators to choose different kinds of pumps for particular applications. When a hydroelectric power plant needed to upgrade, progressing cavity pumps were chosen to help avoid the risk of oil contamination in a river. The low-pulsation and low-turbulence pumps now offer a state-of-the art solution for a historic operation. The operating principles and overall design of progressing cavity pumps make them suitable for universal use. One of their fields of application is the pumping of abrasive liquids that may contain solids, but also fibres. Sludges in sewage plants are one example.
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