A new technique is developed utilizing the system pressure frequency response to locate and quantify leaks and blockages. The pressure frequency response is calculated at the downstream valve by the transfer matrix method. It is found that the presence of leaks and blockages alters the shape of the system pressure frequency response, the amplitude of pressure oscillations at even harmonics is increased and the amplitude at the odd harmonics is decreased. The increase in amplitude at the even harmonics is used to detect the location of leaks or blockages based on the leak and blockage...