Abstract With hydrocarbon targets becoming more inaccessible and further away from the marketplace, the need for operative fault monitoring process for continuous pipeline operation is attracting renewed attention. Dependable evacuation process is essential in managing the volatile hydrocarbon products demand-supply drivers. Pipeline remains the most robust method for full and/or partial transportation of fluids from source to the market/processing place and its reliability is integral to achieving this objective. This study examines the phenomena of a new leakage detection technique in subsea pipelines. The numerical modeling of transient pipe flow based on method of characteristics is initiated by closing the pipe downstream valve. The time history of pressure fluctuation measured as a downstream boundary condition showed that when compared with equal magnitude and spaced pressure signals of the leak free pipeline, damaged pipeline will have changing sinusoidal patterned pressure signals due to the presence of leaky nodes.