oa Civil Engineering = Siviele Ingenieurswese - Control of water hammer in an 8-incr diameter pumping main



The paper draws attention to the considerable reduction of surge pressures and the consequent saving of material in pipelines resulting from the use of air-vessels on pumping mains. Comparisons are drawn between the theoretically predicted pressure fluctuations and those actually measured at several points in an existing installation, both with the air-vessel connected and with the air-vessel isolated. For the sake of clarity in discussing discrepancies between theoretical and actual pressures the water hammer phenomenon is outlined and the graphical analysis is explained in some detail using the actual values. With the air-vessel isolated, separation of the water column hampers the comparison but illustrates the result of this phenomenon and the efficacy of the air-vessel in preventing it.


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