Method and apparatus for characterizing process control equipment integrity

摘要

In a process plant, a first series of impedance measurements from a valve body are received. The first series of impedance measurements are stored. A second series of impedance measurements from the valve body are received. The second series of impedance measurements from the valve body are stored. The first series and second series of impedance measurements are compared. An indication of loss of integrity of the valve body is generated if the first series of impedance measurements deviates from the second series of impedance measurements.

主权项

1. A method implemented at a fault detection and isolation (FDI) system for indicating loss of integrity of a body of a field device, the method comprising:
receiving at the FDI system a first series of measurements from the field device; storing the first series of measurements; receiving at the FDI system a second series of measurements from the field device; storing the second series of measurements; generating a first curve based on the first series of measurements and a second curve based on the second series of measurements; determining a first plurality of coefficients for the first curve and a second plurality of coefficients for the second curve; comparing the first plurality of coefficients and the second plurality of coefficients to determine if the first series of measurements deviates from the second series of measurements; generating an indication if the first plurality of coefficients deviates from the second plurality of coefficients.