Centrifugal Pumps: Design And Application by Val S. Lobanoff, Robert R. Ross

By Val S. Lobanoff, Robert R. Ross

Sensible reference stressing hydraulic layout, functionality prediction, research, and evaluate. New up-to-date variation is a useful reference software for engineers, designers, and scholars and a pragmatic, hands-on advisor for pump clients. DLC: Centrifugal pumps.

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This is due to possible hydraulic problems associated with inadequate vane overlap. Model Law Another index related to specific speed is the pump modeling law. The "model law" is not very well known and usually applies to very large pumps used in hydroelectric applications. It states that two geometrically similar pumps working against the same head will have similar flow conditions (same velocities in every pump section) if they run at speeds inversely proportional to their size, and in that case their capacity will vary 20 Centrifugal Pumps: Design and Application with the square of their size.

An example of model selection is described in detail in the Hydraulic Institutes Standards, 14th Edition. Specific Speed and Modeling Laws 21 Factoring Law In addition to the affinity law and model law, there are some other principles of similarity that are very useful to the pump designer. The "factoring law" can be used to design a new pump that has the same specific speed and running speed as the existing model but which is larger or smaller in size. Factoring the new pump can be determined by using capacity or impeller diameter ratio.

E. to the square of the linear dimensions. As a corollary, the linear dimensions of similar pumps working against the same head will change in direct proportion to the ratio of the square root of their capacities, and the RPM in inverse proportion to the same ratio, This permits selection of a model pump for testing as an alternative to building a full-size prototype. 26, depending on relative surface roughness. Other considerations in the selection of a model are: 1. Head of the model pump is normally the same as the prototype head.

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