Download Centrifugal Pump Handbook, Third Edition by Sulzer Pumps PDF

By Sulzer Pumps

This long-awaited new version is the entire reference for engineers and architects engaged on pump layout and improvement or utilizing centrifugal pumps within the box. This authoritative advisor has been built with entry to the technical services of the major centrifugal pump developer, Sulzer Pumps. as well as delivering the main entire centrifugal pump idea and layout reference with exact fabric on cavitation, erosion, number of fabrics, rotor vibration habit and forces performing on pumps, the instruction manual additionally covers key pumping functions subject matters and operational concerns, together with working functionality in a number of different types of circuitry, drives and popularity testing.

  • Enables readers to appreciate, specify and utilise centrifugal pumps extra successfully, drawing at the industry-leading event of Sulzer Pumps, one of the world's major centrifugal pump developers.
  • Covers conception, layout and operation, with an emphasis on providing first class quality and potency ideas for top capital outlay pump plant users.
  • Updated to hide the newest layout and expertise advancements, together with purposes, try and reliability tactics, cavitation, erosion, number of fabrics, rotor vibration behaviour and operating functionality in a variety of forms of circuitry.
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Additional resources for Centrifugal Pump Handbook, Third Edition

Example text

At least 2 mm must be left (Fig. 19). In this way efficiency can be improved slightly (Fig. 20). Where stage pressures are high, underfiling must be carried out with great care on account of the high static and dynamic stresses involved. 1 Starting torque of centrifugal pumps Normally, the centrifugal pump starting torque is so low that it does not require special consideration. Drivers like steam, gas and water turbines have very high driving torques. The difference between driver and pump torque is sufficient to accelerate a centrifugal pump to its operating speed in a very short time.

As soon as operating speed is reached, the discharge valve is opened. This method is possible only on pumps with low specific speed, where the power input and torque with closed valve are less than at the duty point. 2 STARTUP AGAINST CLOSED NON-RETURN VALVE WITH THE DISCHARGE VALVE OPEN (FIG. 23) When starting, the non-return valve opens at point A, when the back pressure acting on it is reached. As the speed increases, flow rate and head follow the system curve. 3 STARTUP WITH DISCHARGE VALVE OPEN BUT NO STATIC HEAD (FIG.

Annular seals, balance pistons: seal clearance length diameter clearance surface geometry pressure differential Reynolds number, axial Reynolds number, tangential inlet and outlet geometry of the gap balance piston/sleeve misalignment pre-rotation 26 . Physical Principles Hydraulic excitation forces due to hydraulic unbalance interaction: Forces due to hydraulic unbalance interaction (unequal blade loading) and vane passing restoring and lateral forces caused by impeller/diffuser interaction dynamic axial thrusts flow separation phenomena (hydraulic instabilities).

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