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Comparative Hydraulic Simulation of Water Hammer in Transition Pipe Line Systems with Different Diameter and Types Original Article, D43 Sharif F, Siosemarde M, Merufinia E, Esmat Saatlo M. J. Civil Eng. Urban. 4(3): 282-286. 2014 ABSTRACT: The transient pressure caused by water hammer events is sufficient to fracture pipes and some equipment, and for this reason alone the study of the phenomenon in transitional pipe line system is of considerable practical importance. In addition, the diameter and pipe type should be considered to attenuate the transient pressure wave. The paper describes the theory about transient analysis and shows technique in numerical simulation of water hammer in transitional pipe line systems by substituting for different pipe types and diameter or both simultaneously and analyzing the velocity and the type of direct or reflected transitional waves which will the intensities in places where these changes occur and also in boundary conditions. The results indicated that pipe selection and substitution could be from low elastic modulus to high elastic modulus. In order to reduce pressure fluctuation it is advisable to choose pipes with most similar elastic modulus and one greater diameter size. Keywords: Elastic modulus, Pipe line, Transient pressure, Water hammer منبع: [Hidden Content] دانلود: [Hidden Content].,%204%20(3)%20282-286,%202014.pdf J. Civil Eng. Urban., 4 (3) 282-286, 2014.pdf