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Single-Pass Reduction Velocity Checker
Across a reducer, flow speed scales with the bore-area ratio: v₂ = v₁ × (D₁/D₂)². Check a single reduction against the pump-suction velocity ceiling.
Velocity by continuity (incompressible). Pump-suction working band ~0.75–2.5 m/s, ceiling ~2.4 m/s per ANSI/HI 9.6.6. A reduction that pushes suction velocity past the ceiling usually needs a larger upstream line or a gentler cone, not a steeper reducer.
