Transmission Loss as an Indicator of Multiple Leaks in a Pipeline

Because leaks tend to form at joints or welds at the intersection of modular pipes, the occurrence of multiple leaks in a long pipeline is possible. In this study, a multiple-leak detection methodology using an acoustic method was adopted. A mathematical model based on using the transfer matrix method for calculating the sound transmission loss in a pipeline with multiple leaks is presented. It was found that one can clearly differentiate the transmission loss spectrum of multiple leaks from that of a single leak. It was also established that one can distinguish the transmission loss spectra of pipes having two or three concurrent leaks. The transmission loss curves further appear to provide useful indications on the level of leaking severity.