NPSH Calculator

Pump Cavitation & Suction

$1.99 · In‑App Purchases · Designed for iPad. Not verified for macOS.

Will your pump cavitate? Compare NPSH available vs. required, see the full NPSH curve and the maximum safe flow. Will your centrifugal pump cavitate? NPSH Calculator answers that question with your real suction data. Enter your suction line (length, flow, diameter, material and fittings) and the site conditions (liquid temperature, altitude, suction static head). The app calculates the NPSH available at the pump suction, compares it with the NPSH required by your pump and gives you a clear verdict. CAVITATION CHECK + NPSH CURVE • Color-coded verdict: OK, Marginal or Cavitation • Full NPSH available vs. flow curve with your pump's NPSHr overlaid • Maximum safe flow: the exact point where NPSH available drops below NPSHr ACCURATE HEAD LOSS AT ANY TEMPERATURE • Darcy-Weisbach friction (Swamee-Jain), not a fixed 20 °C formula • Water density, viscosity and vapor pressure computed from the temperature (0–100 °C) • Reynolds number and flow regime • 14 pipe materials with real roughness, or your own value • Suction fittings with K coefficients: foot valve, check valve, elbows, tees, reducers, valves REPORTS AND PROJECTS • Export a complete PDF report with inputs, results, verdict and curve • Save and reopen projects by name NPSH INDUSTRIAL (in-app purchase) • 20 industrial fluids: seawater, glycols, caustic soda, gasoline, diesel, crude oil, solvents, sulfuric acid, and saturated LPG (propane, butane), ammonia, CO2 and R-134a, plus a custom fluid • Atmospheric, pressurized and saturated tank modes, with the saturated case handled correctly US and SI units with automatic conversion. Available in 9 languages. Works offline. Note: intended for preliminary calculations and education. Always confirm final designs and pump selections with a qualified engineer and the pump manufacturer.

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Performance improvements and minor fixes.

Version 1.2.2

The developer, Transparent Blue Water LLC, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .

  • Data Not Collected

    The developer does not collect any data from this app.

    Privacy practices may vary, for example, based on the features you use or your age. Learn More

    Accessibility

    The developer has not yet indicated which accessibility features this app supports. Learn More

    Information

    Seller
    Transparent Blue Water LLC
    Size
    36.1 MB
    Category
    Utilities
    Compatibility
    Requires iOS 15.1 or later.
    • iPhone
      Requires iOS 15.1 or later.
    • iPad
      Requires iPadOS 15.1 or later.
    • iPod touch
      Requires iOS 15.1 or later.
    • Mac
      Requires macOS 12.0 or later and a Mac with Apple M1 chip or later.
    • Apple Vision
      Requires visionOS 1.0 or later.
    Languages
    English and 8 more
    • English, French, German, Japanese, Korean, Portuguese, Russian, Simplified Chinese, Spanish
    Age Rating
    4+
    In-App Purchases
    Yes
    Copyright
    © 2025 Alejandro Escandon
  • Developer Website
  • Privacy Policy

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