In rigid pipeline, the pressure wave will travel in the medium at a velocity C equal to the velocity of sound in an infinite expansion of the medium, and given by

C = √K/ ρ

Where K = Bulk modulus of liuid
           ρ = Mass density of fluid

If the pipe is elastic, the velocity of propagation will be less than that given by Equation and depends upon the diameter D, thickness, t of the pipe and the modulus of elasticity E of the pipe material. The velocity of the pressure wave in an elastic pipe is given by

C = √K/ ρ [1/1 + D/t. K/E ]^1/2

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