A WHRS feedwater pump trip is one of the few events that can take a boiler from steady operation to safety-significant condition in seconds. Cavitation from low NPSH, feedwater chemistry that has degraded the impeller, control valve faults, or simply a power supply transient can each take the pump offline. The boiler responds immediately: drum level falls, steam pressure drops, and turbine load has to be cut back fast. The recovery sequence is well-defined, but the margin for error is small.
Why this matters in the whrs
Feedwater is the boiler's lifeblood. A pump trip that is not handled cleanly can leave the boiler in a low-water condition that risks tube damage, drum stress, or worse. Standby pump changeover, drum level protection, and turbine load reduction sequences exist precisely because the consequences of a slow response are unacceptable.
Upstream causes matter for prevention. Cavitation traces to NPSH conditions that have shifted from design — usually condensate temperature, valve restriction, or system loading. Water chemistry issues trace to feedwater treatment performance over the campaign. Each trip is a chance to investigate which of those has drifted, not just to log the event and reset.