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<emphasis role="italic"><emphasis role="bold">OPERATION</emphasis></emphasis>
<emphasis role="italic"><emphasis role="bold">OPERATION</emphasis></emphasis>Pumps are generally selected for a given capacity and total head when operating at rated speed. These characteristics are referred to as “rated conditions of service” and, with few exceptions, represent those conditions at or near which the pump will operate the greatest part of the time. Positive displacement pumps cannot operate at any greater flows than rated except by increasing their speed, nor can they operate at lower flows except by reducing their operating speed or bypassing some of the flow back to the source of supply. (See
Igor J. Karassik; Joseph P. Messina; Paul Cooper; Charles C. Heald: Pump Handbook, Fourth Edition. OPERATION, Chapter (McGraw-Hill Professional, 2008 2001 1986 1976), AccessEngineering Export