A properly designed impeller optimizes flow while minimizing turbulence and maximizing efficiency.They are typically used in small-diameter, inexpensive pumps and pumps handling suspended solids.Because of minimization of recirculation and other losses, it is very important that a small clearance exists between the impeller vanes and the casing.They are used in large pumps with high efficiencies and low required Net Positive Suction Head.
The centrifugal pumps with closed impeller are the most widely used pumps handling clear liquids. They rely on close-clearance wear rings on the impeller and on the pump casing. The closed impeller is a more complicated and expensive design not only because of the impeller, but the additional wear rings are needed. Also the diffuser may be fitted with fixed vanes to help guide the flow toward the exit. The energy transferred to the liquid corresponds to the velocity at the edge of the impeller. The faster the impeller revolves or the bigger the impeller is, the higher will the velocity head be. It is not classification based on the impeller alone, but it is based on the design of pump casing and the impeller. Nuclear Reactor Engineering: Reactor Systems Engineering, Springer; 4th edition, 1994, ISBN: 978-0412985317. Main purpose of this website is to help the public to learn some interesting and important information about thermal engineering. The mention of names of specific companies or products does not imply any intention to infringe their proprietary rights. Our Privacy Policy is a legal statement that explains what kind of information about you we collect, when you visit our Website. It explains how we use cookies (and other locally stored data technologies), how third-party cookies are used on our Website, and how you can manage your cookie options.
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