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Engineering Calculator · 124

Pressure Decay & Reference Leak Rate Calculator

Convert stabilized pressure decay in a rigid test volume into pressure-volume throughput and a leak rate at stated reference conditions.

Pressure & environment
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Live calculation

Enter the known values.

Units remain visible beside every field and result. Change any input to recalculate immediately in your browser.

01

Inputs

02

Results

Gas volume loss at entered reference conditions0.01L/min
Pressure-volume throughput at test temperature0.016667Pa·m³/s
Average pressure-decay rate1kPa/min

Formula
Qref=V ΔpprefTref,KTgas,K60ΔtsQ_{\mathrm{ref}}=\frac{V\,\Delta p}{p_{\mathrm{ref}}}\frac{T_{\mathrm{ref},K}}{T_{\mathrm{gas},K}}\frac{60}{\Delta t_s}qpV=V ΔpΔtsq_{pV}=\frac{V\,\Delta p}{\Delta t_s}

The calculation runs locally in this browser. Values are not submitted or stored by this tool.

Direct answer

What this result means

At stable gas temperature and fixed volume, a pressure loss represents a decrease in gas quantity. A 1 L volume losing 1 kPa in 60 seconds gives 0.01 L/min at 100 kPa reference pressure when test and reference temperatures match. Temperature drift or volume change can imitate a leak.

Pressure Decay & Reference Leak Rate Calculator engineering relationship diagramThe reference volumetric rate uses litres, kilopascals, kelvin and seconds before conversion to L/min. Pressure-volume throughput is reported at the test temperature in Pa·m³/s; one kPa·L equals one Pa·m³. Include connected tubing in the effective volume and establish stabilization and calibration before interpreting decay. This dedicated schematic represents pressure decay rigid volume time trace and is not to scale.Volume VInterval ΔtΔpStable gas temperatureISOTHERMAL GAS-LOSS ESTIMATE · TOOL 124Effective test volumeGas volume loss at entered…
Calculator-specific engineering relationship diagram — schematic, not a product drawing, and not to scale.

Formula & theory

Make the assumptions visible.

The reference volumetric rate uses litres, kilopascals, kelvin and seconds before conversion to L/min. Pressure-volume throughput is reported at the test temperature in Pa·m³/s; one kPa·L equals one Pa·m³. Include connected tubing in the effective volume and establish stabilization and calibration before interpreting decay.

Calculation relationship
Qref=V ΔpprefTref,KTgas,K60ΔtsQ_{\mathrm{ref}}=\frac{V\,\Delta p}{p_{\mathrm{ref}}}\frac{T_{\mathrm{ref},K}}{T_{\mathrm{gas},K}}\frac{60}{\Delta t_s}qpV=V ΔpΔtsq_{pV}=\frac{V\,\Delta p}{\Delta t_s}

The reference volumetric rate uses litres, kilopascals, kelvin and seconds before conversion to L/min. Pressure-volume throughput is reported at the test temperature in Pa·m³/s; one kPa·L equals one Pa·m³. Include connected tubing in the effective volume and establish stabilization and calibration before interpreting decay.

Formula terms

Variables

ΔpStart minus end absolute pressure at stable test temperaturekPa
Tref,K, Tgas,KReference and stabilized test gas temperaturesK
ΔtsElapsed pressure-decay detection intervals

Use sequence

From measurement to review

  1. Stabilize the gas temperature and establish effective test volume, fixture leakage and calibration.
  2. Enter start/end absolute pressures, detection time and explicit test/reference conditions.
  3. Report those conditions with the estimate and compare only against a compatible approved test limit.

Limits

What this calculation does not confirm

  • Gas behaves ideally; the effective volume and test gas temperature remain constant during detection.
  • The model treats measured pressure loss as gas loss. Cooling, compliance, sorption and fixture leakage require separate control.
  • The result is an average conversion, not a complete calibrated leak test, gas-species correction, IP rating or product acceptance decision.

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Calculator FAQ

Use the number without losing the engineering context.

These answers clarify what the tool calculates and where a product-specific review still begins.

01Calculator guidanceWhat reference conditions apply to this pressure-decay leak rate?

The L/min result uses the entered reference absolute pressure and temperature. Always include both with the value; the calculator does not apply an unstated definition of standard or normal litres.

02Calculator guidanceCan a falling pressure reading prove that a gland is leaking?

No. Gas cooling, fixture leakage, volume compliance and absorption can also change pressure. A suitable stabilized, calibrated procedure is required before attributing pressure decay to the product.

03Calculator guidanceWhy must the pressure-decay test volume include connected tubing?

Pressure decay reflects gas quantity change in the entire connected volume. Omitting fixture or tubing volume changes the conversion, so use the effective or calibrated equivalent volume required by the method.

Product selection support

Connect the calculation with cable-entry product options.

Bepto Cable Glands can help relate a preliminary result to the product family and current model information for your application. You can start with the details you have; a complete drawing package is not needed to ask a question.

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