NPSH Calculator (Net Positive Suction Head)

Calculate NPSH available = P_atm/(ρg) + z_s - h_fs - P_v/(ρg). Must exceed NPSH required from pump curve plus safety margin of 0.5-1.0 m. Critical for preventing pump cavitation.

2D stress state at a point. All stresses in MPa.

σx — Normal Stress X (MPa)
σy — Normal Stress Y (MPa)
τxy — Shear Stress (MPa)
⚙ Mechanical Note: Results are based on standard textbook formulas and ISO/AASHTO references. Always verify critical designs with applicable codes (ISO 898, AASHTO 1993, AISC, Eurocode 3) and a qualified engineer.
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How It Works

Calculate NPSH available = P_atm/(ρg) + z_s - h_fs - P_v/(ρg). Must exceed NPSH required from pump curve plus safety margin of 0.5-1.0 m. Critical for preventing pump cavitation

Each component has a specific meaning:

  • Pump curve plus safety margin of 0 — The pump curve plus safety margin of 0 recorded for the patient or scenario being assessed.

Note: Interpret the npsh result against the clinical thresholds and context described above.

How to Use

Enter the pump curve plus safety margin of 0 for the patient or scenario you are assessing. Calculate NPSH available = P_atm/(ρg) + z_s - h_fs - P_v/(ρg). Must exceed NPSH required from pump curve plus safety margin of 0.5-1.0 m. Critical for preventing pump cavitation. Use the npsh result to inform your clinical assessment.

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Frequently Asked Questions