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Leak Rate Calculator

Calculate Leakage Rate Parameters
Select Answer Mode
Pressure Loss (ΔP) [?]
Test Volume (V) [?]
Test Duration (t) [?]
Leak Rate (QL) [?]

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Change the answer mode for this tool by selecting pressure loss (ΔP), test volume (V), test duration (t) or leak rate (QL) as the parameter to calculate instead



Featured leak testing products

  • Intrinsically safe version of LEO Record Hydraulic Testing Intrinsic Safety Approved Pressure Data Loggers - Intrinsically safe pressure data loggers are essential tools for testing and validating the performance of hydraulic systems in hazardous environments where explosive atmospheres may be present.
  • Pressure Gauges with Integral Data Logger - Digital pressure gauges combined with a programmable data logger for recording pneumatic or hydraulic pressures at set time periods.

Related Tools

  • Leak rate units conversion
  • Pressure units conversion
  • Volume units conversion
  • Time period units conversion

Contents

Toggle
  • User Guide
    • Formulas
      • Symbols
    • Pressure Loss (ΔP)
    • Test Volume (V)
    • Test Duration Time (t)
    • Leak Rate (QL )

User Guide

This tool will calculate any parameter from the formula for leakage rate for a pressurised enclosed space Q=ΔPV/t, which includes the difference in pressure from the start to the finish of the leak test, the total volume of the space being tested, the elapsed time of the leak test, and the average leakage rate.

Formulas

The formulas used by this leakage rate calculator to determine each individual parameter are:

ΔP = QL · t / V

V = QL · t / ΔP

t = ΔP · V / QL

QL  = ΔP · V / t

Symbols

  • ΔP = Pressure loss
  • V = Test volume
  • t = Test duration time
  • QL = Leak rate

Pressure Loss (ΔP)

This is how much the pressure changes during a leak test.

Test Volume (V)

This is the total internal volume of the vessel being tested.

Test Duration Time (t)

This is the time taken for the pressure to drop during a leak test.

Leak Rate (QL )

This is a measure of the rate of gas loss from a test volume over the duration of the leak test. It is intended to provide a measure of the proportion of the total gas that has escaped, so that the same pressure loss for a larger sized volume would result in a larger leak rate value.

The following leak rate units can be used with this calculator:

  • millibar litres per second (mbar·L/s)
  • pascal cubic metres per second (Pa·m³/s)
  • pascal litres per second (Pa·L/s)
  • standard litres per minute (atm·L/min, slm, slpm)
  • standard cubic millimetres per second (atm·mm³/s)
  • standard cubic centimetres per second (atm·cm³/s, sccs)
  • standard cubic centimetres per minute (atm·cm³/min, sccm)
  • standard cubic centimetres per hour (atm·cm³/h)
  • standard cubic metres per minute (atm·m³/min)
  • standard cubic feet per minute (atm·ft³/min)
  • standard cubic feet per year (atm·ft³/yr)
  • micron of mercury litres per second (µHg·L/s, lusec)
  • micron of mercury cubic feet per minute (µHg·ft³/min, µHg·cfm)
  • micron of mercury cubic feet per hour (µHg·ft³/h)
  • torr litres per second (Torr·L/s)

Featured leak testing products

  • DM01 Multi-Range High Accuracy Pressure Gauge - High precision digital pressure gauge with 0.05% full scale accuracy, exchangeable pressure range modules from 100 mbar (1.5 psi) up to 400 bar (6000 psi).
  • UPS-HSR USB Pressure Sensor with High Sample Rate Logging - USB ready digital pressure sensor for recording pressures with a high speed sample rate of up to 1 kHz to a computer.

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Wirelessly Measure & Log Pressure

Use this battery powered wireless pressure sensor to transmit readings to a receiver connected to USB, RS485, RS232, cellular network or analog output

Use this battery powered wireless pressure sensor to transmit readings to a receiver connected to USB, RS485, RS232, cellular network or analog output
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