Method and apparatus for characterizing process control equipment coupling integrity

摘要

In a process plant, a first series of measurements from a coupling interface are received. The first series of measurements are stored. A second series of measurements from a coupling interface are received. The second series of measurements. The first series and second series of measurements are compared. An indication of loss of clamping force is generated if the first series of measurements deviates from the second series of measurements.

主权项

1. A method implemented at a fault detection and isolation (FDI) system for indicating loss of clamping force at a coupling interface of a pair of flanges, the method comprising;
receiving at the FDI system, a first series of measurements made at a coupling interface; storing the first series of measurements; receiving at the FDI system a second series of measurements made at the coupling interface; 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 for the first curve and the second plurality of coefficients for the second curve to determine if the first series of measurements deviates from the second series of measurements; generating an indication if the first series of measurements deviates from the second series of measurements.