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Selecting a Positive Displacement Pump

By Petersen and Jacoby, Viking Pump Inc. |

The need to reduce production costs and optimize energy consumption makes proper pump selection more important than ever. Understanding basic pumping principles and the fluid characteristics for a given application is the starting point for selection  It has been said that pumps are the second most common piece of industrial equipment next to electric motors. There are literally millions of pumps in use around the world handling thousands of different liquids. With the many types of pumps available, selecting the proper pump for any given application can be complex. The pump selection process is, in large part, matching a particular pump’s capability with system requirements and properties of the liquid to be pumped. In this article, we will start with a discussion of liquid and system properties and then move on to discussing specific pump capabilities.   The basics The first consideration in any application is understanding the expectations for the pump. Inlet conditions, required flowrate, differential pressure, temperature, and liquid characteristics — such as viscosity, abrasiveness, shear sensitivity and corrosiveness — must all be determined before a pump can be selected. A pump needs proper suction conditions to…
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