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STG-17 CV-1 FAILURE TO CLOSE DURING VALVE TEST.pptx

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Ashwin Narayan
Ashwin Narayan

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STG-17 CV-1 NOT CLOSING DURING VALVE TEST GROUP D POINTS
POSSIBLE CAUSES • TEST SOLENOID NOT ACTIVATED OR COMMAND NOT GOING PROPERLY. • SIGNAL TO TEST SOLENOID ISSUE • FRD OR DRAIN PORTS IN ACTUATOR BLOCKED. • STICKY SOLENOIDS • HYDRAULIC FLUID CONTAMINATION (HIGH OXIDATION) • VALVE STEM AND BUSHING CLEARANCE LESS DUE TO OXIDATION DEPOSIT
MAINTEANCE ACTIVITIES DONE SO FAR • VALVE INSPECTION DONE DURING 2021 OUTAGE • IMD CHECKED SOLENOID COMMAND AND POWER SUPPLY AND CHECKED ACTUATION OF SOLENOIDS PLACING PRESSURE GAUGES AT ACTUATOR PORTS. • CONTROL VALVE ACTUATOR REPLACED 2 TIMES • RECIRCULATION OF HYDRAULIC OIL THROUGH OIL WATER SEPERATOR • HYDRAULIC OIL CHANGE.
RECOMMENDATIONS • CONTROL VALVE STEM AND BUSHING INTERNAL INSPECTION AND HYDRAULIC OIL TESTING FOR OXIDATION-ASHWIN • THERMOGRAPHY WHILE VALVE TEST BEING CARRIED OUT AND HYDRAULIC PUMP PRESSURE INCREASE AND CHECK-RAVI JOSHI.
VALVE INSPECTION REASONS
STG-17 CV-1 FAILURE TO CLOSE DURING VALVE TEST.pptx

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STG-17 CV-1 FAILURE TO CLOSE DURING VALVE TEST.pptx

  • 1. STG-17 CV-1 NOT CLOSING DURING VALVE TEST GROUP D POINTS
  • 2. POSSIBLE CAUSES • TEST SOLENOID NOT ACTIVATED OR COMMAND NOT GOING PROPERLY. • SIGNAL TO TEST SOLENOID ISSUE • FRD OR DRAIN PORTS IN ACTUATOR BLOCKED. • STICKY SOLENOIDS • HYDRAULIC FLUID CONTAMINATION (HIGH OXIDATION) • VALVE STEM AND BUSHING CLEARANCE LESS DUE TO OXIDATION DEPOSIT
  • 3. MAINTEANCE ACTIVITIES DONE SO FAR • VALVE INSPECTION DONE DURING 2021 OUTAGE • IMD CHECKED SOLENOID COMMAND AND POWER SUPPLY AND CHECKED ACTUATION OF SOLENOIDS PLACING PRESSURE GAUGES AT ACTUATOR PORTS. • CONTROL VALVE ACTUATOR REPLACED 2 TIMES • RECIRCULATION OF HYDRAULIC OIL THROUGH OIL WATER SEPERATOR • HYDRAULIC OIL CHANGE.
  • 4. RECOMMENDATIONS • CONTROL VALVE STEM AND BUSHING INTERNAL INSPECTION AND HYDRAULIC OIL TESTING FOR OXIDATION-ASHWIN • THERMOGRAPHY WHILE VALVE TEST BEING CARRIED OUT AND HYDRAULIC PUMP PRESSURE INCREASE AND CHECK-RAVI JOSHI.