Reactor Troubleshooting
The most common reactor problems on the plant floor, with the likely causes and the fix for each. Part of the OEE Lab directory of 301+ documented problems.
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Problems on this page:
Temperature control problems
Hits OEE: QualitySymptoms: Cannot hold/reach temperature, exotherm overshoot, off-spec batch.
Prevention: Heat-transfer surface upkeep, loop tuning, agitation checks.
Agitator or seal issues
Hits OEE: AvailabilitySymptoms: Mechanical-seal leak, agitator vibration, contamination risk.
Prevention: Seal-support upkeep, drive condition monitoring, impeller checks.
Pressure or relief concerns
Hits OEE: AvailabilitySymptoms: Pressure alarms, relief device lifts, batch holds for safety.
Prevention: Relief-path integrity, recipe control, instrument/interlock testing.
Reactor troubleshooting FAQ
Reactor: what causes temperature control problems, and how do I fix it?
Symptoms: Cannot hold/reach temperature, exotherm overshoot, off-spec batch. Likely causes: Jacket/coil fouling or flow; Control loop tuning; Agitation poor (hot/cold spots). Fixes: Clean the jacket/coil; check heating/cooling flow. Tune the temperature loop; check the control valve. Verify agitation; check the impeller and baffles. Prevention: Heat-transfer surface upkeep, loop tuning, agitation checks.
Reactor: what causes agitator or seal issues, and how do I fix it?
Symptoms: Mechanical-seal leak, agitator vibration, contamination risk. Likely causes: Mechanical seal wear; Bearing or coupling wear; Imbalance or fouling on the impeller. Fixes: Service the seal; check the seal flush/barrier fluid. Inspect drive bearings and coupling. Clean and inspect the impeller and shaft. Prevention: Seal-support upkeep, drive condition monitoring, impeller checks.
Reactor: what causes pressure or relief concerns, and how do I fix it?
Symptoms: Pressure alarms, relief device lifts, batch holds for safety. Likely causes: Vent/relief path blocked; Overcharge or reaction upset; Instrument or interlock fault. Fixes: Verify clear vent/relief paths; inspect rupture disc/PRV. Follow charging/recipe controls; manage the reaction rate. Check pressure transmitters and safety interlocks. Prevention: Relief-path integrity, recipe control, instrument/interlock testing.
Stop the same fault coming back
Recurring reactor stops usually trace to a cause you cannot see by hand. The partner we recommend is Fabrico: EU-built, so your production data stays in EU jurisdiction, with computer-vision true-cause of micro-stops, a closed loop from PLC-read OEE to an auto-routed work order, and ISO 27001 / 20000-1 / 9001 (supports audit-readiness).
See how Fabrico finds root causeRelated tools: full troubleshooting directory · OEE calculator · downtime cost · MTBF / MTTR · glossary
Methods that cut recurring stops: the six big losses · root cause analysis · preventive vs predictive maintenance · TPM · SMED & changeover