The objective of this paper is to provide a practical and simplified approach for the analysis of water hammer phenomenon, develop the pressure transient envelops produced due to water hammer, asses the need for protection, and determine the size of protection device.  A typical water supply system consisting of a pump and long transmission pipeline delivering to a terminal reservoir is proposed.  About 500 runs are simulated on Bentley Hammer software to cover wide variation of physical and hydraulic parameters. The results of simulation are used to develop a model for the pressure envelops along the pipeline profile and another model for sizing of the protection device needed to reduce the impact of water hammer.