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Butterfly valves-How to Estimate Cavitation Level and Related Damage on Existing Locks and at the Laboratory?

Author(s): C. Savary; M. Minet

Linked Author(s): Céline Savary

Keywords: Cavitation; Butterfly valves; Lock; Monitoring; Hydrophone

Abstract: The butterfly valves (3.5m diameter) of the new lock of Lanaye (Albert canal Belgium) are subject to cavitation during the filling/emptying of the lock. On site measurements were realized to characterize the cavitation and to optimize valves operation in order to decrease the intensity and duration of cavitation. For comparison, measurements were realized in an existing lock with similar valves which also experience cavitation but without associated damage since 1960. The duration of cavitation is more or less the same for both locks, but the cavitation intensity is more important in Lanaye. To check the appearance of eventual damages, annual monitoring of the valves is realized. Small damage was observed but the link with cavitation is not obvious. In parallel, at the laboratory, the efficiency of aeration provided around the valve was tested for different configurations. The sound and vibrations due to cavitation are reduced when aeration is provided. Tests realized on a pipe coated with Aluminum indicated that the damage is mainly located downstream of the valve on the upper part of the pipe. These tests confirm that aeration is appropriate to reduce damage induced by cavitation.


Year: 2018

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