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Keywords:

  • high-gain observers;
  • observer-based fault detection;
  • partial differential equations;
  • fluid systems;
  • LPG pipeline;
  • leak location

SUMMARY

This paper describes a scheme based on high-gain observers to detect and locate leaks in subterranean pipelines of liquefied petroleum gas (LPG). In fact, sub-observers connected in cascade are used to generate residuals that allow to detect when a leak occurs and, above all, to isolate the region of the pipeline where the leak is located. Once the region is identified, a dedicated observer is employed to more precisely estimate the leak position as well as its coefficient. The approach is validated with data from a real industrial LPG pipeline. Copyright © 2012 John Wiley & Sons, Ltd.