Download Centrifugal Pumps: Design and Application, Second Edition by Val S. Lobanoff, Robert R. Ross PDF

By Val S. Lobanoff, Robert R. Ross

Centrifugal Pumps: layout and alertness accommodates topics reminiscent of 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 set up and operation.
This quantity includes 21 chapters, with an introductory bankruptcy discussing procedure research for pump choice. the subsequent chapters then cross directly to talk about particular pace and modeling legislation; impeller layout; normal 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 publication might be of curiosity to practitioners within the fields of mechanical engineering and equipment administration.

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Extra info for Centrifugal Pumps: Design and Application, Second Edition

Example text

Impeller Design Figure 3-16. Influence of b2 on pump performance. Figure 3-17. Predicting efficiency on both sides of BER 43 44 Centrifugal Pumps: Design and Application » To predict efficiency on both sides of BEP, use Figure 3-17. • When designing a new pump, always have a performance curve and general sectional drawing. • Keep neat and accurate design records. « Try to use a symmetrical impeller to avoid excessive axial thrust. • Consider mechanical requirements applicable to the new design.

The larger the impeller cut, the larger the discrepancy as shown in Figure 2-6. Example What impeller trim is required on a 7-in. impeller to reduce head from 135 ft to 90 ft? 72 in. 82 Step 2, Establish correction factor: From Figure 2-6 calculated diameter . 82 = Actual required diameter ,84. 88 in. Impeller trims less than 80% of original diameter should be avoided since they result in a considerable drop in efficiency and might create unstable pump performance. Also, for pumps of high specific speed (2,500-4,000), impeller trim should be limited to 90% of original diameter.

The larger the impeller cut, the larger the discrepancy as shown in Figure 2-6. Example What impeller trim is required on a 7-in. impeller to reduce head from 135 ft to 90 ft? 72 in. 82 Step 2, Establish correction factor: From Figure 2-6 calculated diameter . 82 = Actual required diameter ,84. 88 in. Impeller trims less than 80% of original diameter should be avoided since they result in a considerable drop in efficiency and might create unstable pump performance. Also, for pumps of high specific speed (2,500-4,000), impeller trim should be limited to 90% of original diameter.

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