By Val S. Lobanoff, Robert R. Ross
Centrifugal Pumps: layout and alertness accommodates topics similar to nonmetallic pump functions, mechanical seals, vibration and noise in centrifugal pumps, rotor dynamics, and the information essential to expand pump existence in the course of install and operation.
This quantity includes 21 chapters, with an introductory bankruptcy discussing approach research for pump choice. the following chapters then cross directly to talk about particular pace and modeling legislation; impeller layout; common pump layout; volute layout; layout of multi-stage casing; double-suction pumps and side-suction layout; NPSH; vertical pumps; pipeline pumps; high-speed pumps; double-case pumps; slurry pumps; hydraulic strength restoration generators; chemical pumps; shaft layout and axial thrust; mechanical seals; vibration and noise in pumps; alignment; rolling point bearings and lubrication; and mechanical seal reliability.
This ebook might be of curiosity to practitioners within the fields of mechanical engineering and equipment administration.
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Additional info for Centrifugal Pumps: Design and Application, Second Edition
There are cases, however, where the model pump running speed is different than required by pump in question. Figyre 2-7, New pump from model pump-—same speed. 24 Centrifugal Pumps: Design and Application If a new pump has the same specific speed (Ns) as the model but is to run at a different rotating speed, head, and flow, the new pump performance will be related to the model by: Example A new pump is required for 750 GPM, 600-ft head, operating at 5,000 RPM. The calculated specific speed is 1,100.
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. However, successful model testing has been conducted with model head as low as 80% prototype head.
Also, for pumps of high specific speed (2,500-4,000), impeller trim should be limited to 90% of original diameter. 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.
Centrifugal Pumps: Design and Application, Second Edition by Val S. Lobanoff, Robert R. Ross