Centrifugal pumps : design & application by Val S. Lobanoff

By Val S. Lobanoff

Centrifugal Pumps: layout and alertness, moment variation makes a speciality of the layout of chemical pumps, composite fabrics, production recommendations hired in nonmetallic pump functions, mechanical seals, and hydraulic design.

The e-book first bargains details at the components of pump layout, particular velocity and modeling legislation, and impeller layout. Discussions concentrate on form of head ability curve, pump velocity, viscosity, particular gravity, correction for impeller trim, version legislations, and layout feedback. The publication then takes a glance at basic pump layout, volute layout, and layout of multi-stage casing.

The manuscript examines double-suction pumps and side-suction layout, web confident suction head, and vertical pumps. issues contain configurations, layout gains, pump vibration, impact of viscosity, suction piping, excessive pace pumps, and part suction and suction nozzle structure. The e-book additionally ponders on excessive pace pumps, double-case pumps, hydraulic strength restoration generators, and shaft layout and axial thrust.

The booklet is a worthy resource of information for pump designers, scholars, and rotating gear engineers.

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Extra info for Centrifugal pumps : design & application

Sample text

To minimize axial and radial thrust, make the impeller as symmetrical as possible about its vertical centerline. Development of Impeller End View Draw a circle to the full impeller diameter. Divide the circle into several even-degree segments. In this case 15° segments have been chosen (Points 1-10). The smaller the segments, the more accurate the vane layout will be, Impeller Inlet Angles Inlet angles are established from a layout of the velocity triangle, which shows the various component velocities of flow, entering the impeller (Figure 3-10).

Figure 3-14 shows the effect of the number of impeller vanes in the same casing, on H-Q performance. Please note that with less vanes, the lower is the BEP head and efficiency and steeper is the shape of H-Q curve. » It is possible to maintain same BEP, Q, and efficiency by increasing b2 where number of vanes and angularity are reduced (Figure 3-15). For best efficiency, the velocity ratio between volute and impeller peripheral must be maintained. Similarly for the same impeller diameter, vane number and discharge angle BEP will change with change in b2 (Figure 3-16).

Model speed should be such that the specific speed remains the same as that of the prototype. 4. For meaningful evaluation prototype pump and model pump must be geometrically similar and flow through both kinematically similar. 5. Suction requirements of model and prototype should give the same value of sigma (see Chapter 9). 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.

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