Atmos SIM RTTM (Real Time Transient Model) leak detection continuously calculates the volume balance. This volume balance is obtained by calculating the total flow into the system minus the total flow out of the system corrected by the inventory changes calculated by Atmos SIM. The volume balance is statistically analysed by the sequential probability ratio test (SPRT), which calculates the ratio of leak probability over no-leak probability. This ratio is then tested against certain threshold values to provide leak warnings/alarms.
Atmos PIPE - RTSA (Real time statistical analysis)
Atmos Pipe employs Atmos’ unique statistical volume balance method to provide an extremely reliable leak detection system that can detect both onset and existing leaks.
Atmos Pipe can identify operational changes in the pipeline and can detect leaks during transient operations. Data validation algorithms and filtering techniques are employed to improve data quality. Flow measurement errors are also learned to assist in the provision of reliable and sensitive leak detection.
Atmos wave - NPW (Negative pressure wave)
Atmos Wave detects the rarefaction wave caused by a leak in a pipeline. When a leak occurs, a rarefaction wave travels in both directions along a pipeline. Using fast response pressure meters, Atmos Wave filters the pressure signals to find those with the frequency and magnitude of a leak. The time at which the pressure signal reaches each pressure meter is used to determine the location of the leak extremely accurately.