Each failure was repaired like-for-like and closed. The sister pump P-111, with the same seal, lasts three times longer. Valqor compared the operating history before each failure.
The pump spends long periods well below its minimum continuous flow of 20 m³/h. Seal flush temperature jumps by 20 °C during those periods, and the hours spent there rose before each failure.
Three long runs below minimum flow, each with a jump in flush temperature.
Historian readings, alarms, operator notes and work orders, lined up on one timeline.
Each candidate cause is checked against the records, with the evidence for and against it shown side by side.
Evidence forLow-flow hours rose before every failure as seal life fell. The min-flow bypass was found closed in manual on three of the five work orders.
Evidence againstNone found in the available records.
Evidence forFlush temperature spikes during low-flow periods.
Evidence againstThe spikes only happen at low flow, so they look like a consequence, not a separate cause.
Evidence forNone beyond the repeat failures.
Evidence againstThe sister pump P-111 uses the same seal and lasts about three times as long.
An engineer reviews the finding and the linked records before any action is taken.
The seals are failing because P-110 spends more and more time below its minimum flow, mostly when the downstream unit runs at reduced rate and the min-flow bypass has been left in manual.
Six trips in ten weeks, each reset as “no fault found”. The pattern was in the tank level.
See the investigation 02 · Recurring alarmsNine alarms in three weeks, all between noon and 5 pm. The probes were fine; the lube oil wasn’t.
See the investigation 03 · Post-maintenance faultsVibration more than doubled the day the pump was restarted. The work order had no alignment readings.
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