Author(s): Nikola Nikolov; Mariana Maradjieva; Peter Konovski
Linked Author(s):
Keywords: Transient process; Membrane valve; Start-giving valve; Feeder tank; Back-pressure valve; Cavitation; Water supply; Object-Oriented Tools; Air vessel; Start-giving head
Abstract: The long pipelines have usually a length over 1000 m to several thousand meters. In that case a big direct water hammer arises during the transient process in pumping supply systems. Besides a dangerous interruptions of the water column could be observed. This circumstance compels the specialists to escape the long pipelines and to resort to a costly decision by pumping cascades with multiple pumping units. A new protection is proposed by set of membrane valve, start-giving valve and feeder tanks. This protection is more effective, because firstly it leads to construction of pipelines with small thickness and secondly it allows only one pumping station without appearance of cavitation along the pipeline. A practical implementation of this solution brings to an optimal economical decision and to low water hammer head provided the pipeline is tracing closed to the ground. A set of feeder tanks and air vessels are mounted lengthwise of the pipeline on the peak bends. The result of operation shows that the feeder tanks supply the system by water and don’t permit the creation of cavitation zones. The realization was made by authors’ software product by means of Object- Oriented Tools (OOT) for transient flow analysis. The set was tested in laboratory and was investigated by field study during the operation of a real water supply pumping station. The numerical results were compared with “Kistler” transducer system.
Year: 2005