Research Article
Early FDI Based on Residuals Design According to the Analysis of Models of Faults: Application to DAMADICS
Table 1
Faults to be detected and isolated.
| Fault | Description |
| f1 | Valve clogging | f2 | Valve or valve seat sedimentation | f3 | Valve or valve seat erosion | f4 | Increasing of valve or bushing friction | f5 | External leakage | f6 | Internal leakage (valve tightness) | f7 | Medium evaporation or critical flow | f8 | Twisted servomotor's piston rod | f9 | Servomotor's housing or terminals tightness | f10 | Servomotor's diaphragm perforation | f11 | Servomotor's spring fault | f12 | Electropneumatic transducer fault | f13 | Rod displacement sensor fault | f14 | Pressure sensor fault | f15 | Positioner feedback fault | f16 | Positioner supply pressure drop | f17 | Unexpected pressure change across the valve | f18 | Fully or partly opened bypass valves | f19 | Flow rate sensor fault |
|
|