FMEA for Screw Conveyors

FMEA for screw conveyors starts by listing all functions, then identifying how each function can fail, what causes each failure mode, and what the effects would be on safety, operations, and maintenance. Each mode receives severity, occurrence, and detection ratings that multiply into a risk priority number. Modes exceeding the RPN threshold receive specific mitigation actions with assigned owners.

The FMEA for screw conveyors should be reviewed after any failure that reveals a previously unidentified failure mode, after design modifications to the screw flight, trough, hanger bearings, end bearings, and drive unit, and at minimum annually as part of the reliability program review. Operating experience and new condition monitoring data may reveal that occurrence or detection ratings need adjustment, changing the prioritization of mitigation actions.

Preventive (pre-failure), depending on which failure mode is developing. Early-stage signatures on Screw Conveyors appear well before functional failure: bearing noise, flight thinning, product carryover. Catching the fault early means scheduling the repair into a planned outage — usually 6 to 16 hours of planned downtime instead of 24 to 72 hours of unplanned downtime when the asset fails on shift.

Critically. A pre-commissioning baseline captured under controlled conditions becomes the reference for every subsequent FMEA reading. Without that baseline you're measuring against generic ISO thresholds, which can be wrong by 50 percent for a specific asset. Cost of capturing baseline at commissioning is minimal — a single route visit before the asset goes into production service. The data pays back across the next 15 to 25 years of operation.