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🎯Introduction
Problem: Dry running destroys seals and bushings in seconds, warps sleeves, and heat-soaks casings—most “mystery seal failures” trace back to poor priming, blocked suction, or missing interlocks.
What “good” looks like (hold these)
Prime verified: Casing flooded and vented—solid, bubble-free stream at the top vent.
Suction ready: Suction valve open, strainer clean, suction pressure available.
NPSH margin: NPSHA ≥ NPSHR + 1 m (≈3 ft) or ≥10% above NPSHR (use the stricter). Bias upward for hot/volatile fluids.
Minimum Flow protected: ≥ MCSF (OEM); if unknown during warm-up, hold ≥30% of BEP.
Start permissives active: Level OK + Suction PSLL OK + Flow proven ≤10 s after start—else auto-trip.
If OEM limits differ, defer to OEM/site standards.