Abstract: The theoretical study was made of the effect of shut-in procedure on the water hammer pressure pulse. According to this problem, the solutions for different shut-in procedures are similar except for the initial conditions. This paper described a series of one factor stimulant linear partial differential equations, LW method for solution and develops relevant computer programs was presented. It is proved that the solutions were appropriate for “soft” or “hard” shut-in.

Key words: water hammer pressure, shut in, partial differential equation