Examine the overhead product pressure control loop (#33) in this distillation system (in the upper-right corner of the P&ID). Suppose PR-33 shows a pressure of 48.1 PSI, while PIC-33 shows a pressure of 50.0 PSI (equal to setpoint):
Pressure Control Loop
Identify which faults could account for the pressure indication discrepancy:
Distillation System P&ID
The below list shows some possibilities for the errors.
Identify which faults are possible and which are impossible to occur for this pressure control loop.
- PR-33 calibration error
- PT-33 calibration error
- PIC-33 (input) calibration error
- PY-33a calibration error
- PY-33b calibration error
- PV-33a calibration error
- PV-33b calibration error
Answer:
- PR-33 calibration error – Possible
- PT-33 calibration error – Impossible
- PIC-33 (input) calibration error – Possible
- PY-33a calibration error – Possible
- PY-33b calibration error – Impossible
- PV-33a calibration error – Impossible
- PV-33b calibration error – Impossible
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Credits: Tony R. Kuphaldt
