Leak locations are determined by the model-based pressure gradient intersection method. The gradient intersection method is primarily based on the fact that the pressure profile along a pipeline will significantly change when a leak occurs. In these cases, the LDS calculates in combination with the RTTM the intersection point of the differential pressure profiles upstream and downstream of the leak.
The system uses a multi-step approach to achieve maximum location accuracy by reducing the impacts of pressure fluctuations. The model-based pressure gradient intersection method utilizes the profiles of the RTTM to compensate transients.