By Sulzer Pumps
This long-awaited new version is the total reference for engineers and architects engaged on pump layout and improvement or utilizing centrifugal pumps within the box. This authoritative consultant has been built with entry to the technical services of the best centrifugal pump developer, Sulzer Pumps. as well as delivering the main complete centrifugal pump idea and layout reference with targeted fabric on cavitation, erosion, number of fabrics, rotor vibration habit and forces performing on pumps, the guide additionally covers key pumping purposes issues and operational matters, together with working functionality in quite a few different types of circuitry, drives and attractiveness 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 options for top capital outlay pump plant users.
- Updated to hide the newest layout and expertise advancements, together with functions, attempt and reliability systems, cavitation, erosion, number of fabrics, rotor vibration behaviour and operating functionality in a number of forms of circuitry.
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Extra resources for Centrifugal Pump Handbook, Third Edition
A higher NPSHav must be provided. Moreover, increasing speed increases power input approximately by the third power of the speed. Consequently the strength of the shaft must always be verified before increasing the speed. With small speed changes (up to 10%) efficiency remains virtually unchanged. With larger speed changes the velocity in the channels alters and with it the Reynolds number. 4: Conversion of test results). 5 IMPELLER BLADE ADJUSTMENT For axial pumps (and even semi-axial pumps of high specific speed) impellers with adjustable blades can provide a most economical control for duties involving a widely varying flow rate.
Excitation frequencies: – Grid frequency – Twice grid frequency . Normal operation of variable speed electric motors . Excitation frequencies depend on motor control. Examples: – Harmonics of rotational frequency – Slip-dependent frequencies . Normal operation of reciprocating engines (diesel) . Excitation frequencies. Harmonics of rotational frequency. Some torsional excitation originates in speed increasing/reducing gears due to pitch circle runout. The magnitude of excitation depends on the quality of the gear.
When the pipeline is partly blocked by solids which have settled upon shutdown, the pump must generate sufficient flow to get the solids moving. The higher resistances encountered at startup must be overcome, so that adequate flow velocity may be achieved to resume transportation process. 8. When pumping long fibers, open impellers should be used on account of the clogging risk. The inlet edges should be profiled and thickened so that fibers can slide off them more easily. 9. Slurry pumps are subject to heavy wear.