If you're trying to write a defensible site rule for pump minimum flow, ignore the "always run at 25% of BEP" myth. There is no universal percentage that protects every pump. Low-flow damage can start quickly, but the failures show up later—seal life shortens, bearings heat up, vibration creeps, and you get blamed for "bad seals."
Two open loops we'll close:
- There are two minimum-flow limits, not one—and the governing limit is the one that matters.
- You'll get a laminatable diagnostic checklist...
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