variable speed pump Archives - Chemical Engineering Site https://chemicalengineeringsite.in/tag/variable-speed-pump/ For Chemical Engineers Tue, 16 Sep 2025 14:19:26 +0000 en-US hourly 1 https://wordpress.org/?v=6.9.4 Centrifugal Pump Affinity Law Calculator https://chemicalengineeringsite.in/centrifugal-pump-affinity-law-calculator/ Tue, 16 Sep 2025 14:08:55 +0000 https://chemicalengineeringsite.in/?p=4065 Pump Affinity Law Calculator — chemicalengineeringsite.in Pump Affinity Law Calculator Select Input Mode (Speed or Diameter change). Enter baseline point. Calculates new Q₂, H₂, P₂. Export to Excel with live formulas. Input Mode Speed Change Diameter Change Baseline Speed n₁ rpm Baseline Impeller Dia D₁ mmcmminch Baseline Flow Q₁ m³/sm³/hL/sgpm Baseline Head H₁ mft Baseline […]

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Pump Affinity Law Calculator

Select Input Mode (Speed or Diameter change). Enter baseline point. Calculates new Q₂, H₂, P₂. Export to Excel with live formulas.

Input Mode
Mode
Speed Change
Ratio used (r)
–
New Flow Q₂
– m³/h
New Head H₂
– m
New Power P₂
– kW
Formulas, units & assumptions
  • Speed Change (D constant): Q₂ = Q₁·(n₂/n₁), H₂ = H₁·(n₂/n₁)², P₂ = P₁·(n₂/n₁)³
  • Diameter Change (n constant): Q₂ = Q₁·(D₂/D₁), H₂ = H₁·(D₂/D₁)², P₂ = P₁·(D₂/D₁)³
  • Results shown in the same units as inputs (Flow: m³/s, m³/h, L/s, gpm; Head: m, ft; Power: kW, HP; Diameter: mm, cm, m, inch).
  • Assumes constant efficiency. For large changes, verify with pump curves.

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