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Centrifugal Pumps
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ISBN: 9535155725 9535100513 Year: 2012 Publisher: IntechOpen

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Abstract

The structure of a hydraulic machine, as a centrifugal pump, is evolved principally to satisfy the requirements of the fluid flow. However taking into account the strong interaction between the pump and the pumping installation, the need to control the operation, the requirement to operate at best efficiency in order to save energy, the provision to improve the operation against cavitation and other more specific but very interesting and important topics, the object of a book on centrifugal pumps must cover a large field. The present book examines a number of these more specific topics, beyond the contents of a textbook, treating not only the pump's design and operation but also strategies to increase energy efficiency, the fluid flow control, the fault diagnosis.


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Aquam in altum exprimere : Les machines élévatrices d’eau dans l’Antiquité

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Les machines élévatrices d’eau ont été pendant longtemps méconnues dans l’Antiquité romaine car seule comptait l’eau courante et abondante amenée par les aqueducs. Pourtant de nombreux sites en ont livré plusieurs exemples depuis le xixe s., témoignages de la diversité des techniques. Ces dernières années, les découvertes se sont multipliées et permettent d’appréhender ces éléments fragiles car faisant souvent appel au bois, avec les méthodes d’étude les plus récentes. La Table-ronde organisée à Ausonius en 2003 a permis de faire le point de l’état des connaissances. In the ancient Roman world, where the plentiful supply of running water by the prestigious aqueducts was what mattered most, water-lifting devices remained largely unknown. Since the 19th century, however, a range of such devices, confirming the use of several different techniques, has been found in numerous sites. Moreover, as the number of such discoveries has increased in recent years, this has enabled the most up-to-date methods to be applied to these structures which, as wood elements are often used, are particulary fragile. Aquam in Altum Exprimere, the Round-table Study Day organized by Ausonius in 2003 has contributed to a general stocktaking of our present-day knowledge on this subject.

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