Speed change: Q₂/Q₁ = N₂/N₁, H₂/H₁ = (N₂/N₁)², P₂/P₁ = (N₂/N₁)³
Impeller trim: Q₂/Q₁ = D₂/D₁, H₂/H₁ = (D₂/D₁)², P₂/P₁ = (D₂/D₁)³
Valid for same pump, same efficiency point, and changes less than ~20%.
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