1Litostroj Power d.o.o., Litrostrojska 50, 1000 Ljubljana, Slovenia
2School of Computer Science and Technology, Tianjin University. China
3Jundi Shapur University of Technology, Dezful
4Department of Mathematics and Computer Science, Eindhoven Universityof Technology, The Netherlands
An experiment featuring waterhammer in viscoelastic pipes is presented in which the effects of pipe-wall viscoelasticity on waterhammer pressures are investigated. A large-scale pipeline apparatus made of polyvinyl chloride (PVC) at Deltares, Delft, The Netherlands, has been used to carry out waterhammer experiments. Tests have been conducted in a reservoir-pipeline-valve system consisting of a main viscoelastic pipeline and two short steel pipes placed upstream and downstream of the main pipe. Rapid closure of a manually operated valve at the downstream end generates waterhammer. Repeated measurements at several positions along the pipeline have been recorded; these are plotted in figures and appropriately interpreted.