TDH = H_geo + H_friction + (P_discharge - P_suction) * 10.2
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| Output Parameter | Value | Unit | Status | | :--- | :--- | :--- | :--- | | Total Dynamic Head | 52.3 | m | ✅ OK | | Flow Rate | 50 | m³/h | ✅ OK | | NPSHa | 4.2 | m | ✅ > NPSHr (3.7 m) | | Required Motor Power | 11 | kW | Select 11 kW / 15 HP | | Velocity | 2.1 | m/s | ⚠️ High (limit 2.0 m/s) | booster pump calculation excel
The most reliable way to avoid these pitfalls? A well-structured . While dedicated software exists, Excel remains the industry workhorse because it is transparent, customizable, and universally accessible.
| Parameter | Unit | Description | Typical Value | | :--- | :--- | :--- | :--- | | Flow Rate (Q) | m³/h or GPM | Peak demand (fixture units, sprinkler heads, etc.) | Variable | | Suction Pressure (P_suction) | bar or psi | Pressure available at pump inlet (from city main or tank) | 2.5 bar | | Required Discharge Pressure (P_discharge) | bar or psi | Pressure needed at the highest/farthest fixture | 4.0 bar | | Elevation Difference (H_geo) | m or ft | Vertical distance from pump to highest point | 25 m | | Pipe Length (L) | m | Total length of the longest run | 150 m | | Pipe Diameter (D) | mm or in | Nominal bore | 80 mm | | Friction Factor (f) | dimensionless | Darcy-Weisbach or Hazen-Williams C-factor | 0.02 (or C=130) | TDH = H_geo + H_friction + (P_discharge - P_suction) * 10
Q_m3h = 50 [m³/h] Q_m3s = Q_m3h / 3600 D_m = 0.08 [80 mm] Area = PI() * (D_m/2)^2 v = Q_m3s / Area f = 0.02 (assume clean steel pipe) L = 150 g = 9.81 H_friction = f * (L / D_m) * (v^2 / (2*g)) Create a lookup table for f based on pipe material and Reynolds number using the Moody chart. Use XLOOKUP or INDEX-MATCH . 2.3 NPSH Available (Net Positive Suction Head) – The Cavitation Check Cavitation destroys pumps. Always calculate NPSHa:
Use data validation dropdowns for units (e.g., m vs. ft) and apply CONVERT functions to standardize all inputs to SI or US customary internally. Part 2: Key Calculations (The Engine of Your Spreadsheet) In a hidden or dedicated column, perform these critical steps. 2.1 Total Dynamic Head (TDH) – The Master Formula The pump must overcome three things: elevation, friction, and velocity head (usually negligible). The core Excel formula for TDH (in meters of water column) is: | Parameter | Unit | Description | Typical
In this post, I’ll break down the key calculations every booster pump sizing spreadsheet must include, complete with formulas and logic. Your Excel sheet should start with a clear Input tab. Without accurate data, the best formulas are useless.