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Pressure Decay - dP and dP/dT


Pressure Decay Test Diagram

The Pressure Decay test determines pressure loss measured over a fixed time and presented as the amount of absolute pressure change. The basic operation of a pressure decay test is to fill the test part to a specified target test pressure, isolate the test part circuit from the pressure source, stabilized the pressure, and measured the pressure loss over a defined test time. The test results for pressure decay provide a delta pressure loss as the result of a leak and reported as dP or dP/dT.  The dP test reports the ‘pressure drop’ for the full test time. The dP/dT test measures the pressure drop and reports the ‘average pressure drop’ to specify the pressure loss in one second.  

Example:  dP and dP/dT test results

dP Test Test time = 10 sec
  Measured leak = 1.0 psig
  Pressure drop = 1 psig in 10 seconds

dP/dT Test 

Test time

= 10 sec
  Measured leak = 1.0 psig
  Pressure drop = 1.0 psig / 10 sec  =  0.1 psig per second






As standard, the pressure decay leak test methods can be performed with pressure (P) or vacuum (V) and results identified as dP, dV, dP/dT, or dV/dT.

Cincinnati Test Systems utilizes IP67 & IP68 standards in all our pressure decay test solutions.
For more information please see our FAQ page here.

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