
Pressure Calculator - Once we know the Average Allowable ROC, we apply it to a test by sampling a short duration of pressure x time data and multiply it out to display it as psi/min, then compare that to the specified Average Allowable ROC. Pressure Test Result Prediction with Average Allowable Rate of change- The DARTT Recorder samples data over a few seconds, removing motion induced pressure noise (vessel or rig heave causing water hammer) and displaying psi/min.


To aid in testing, Test Pressure and Hold Period can be combined into a rate of change (ROC).
For example, where the Hold Period = 10min and the Allowable Pressure Loss = 30psi, the Average Allowable ROC = 3psi/min.
That is, if the average rate of Pressure Calculator change during the 10min Hold Period =< 3psi/min, then the hold and allowable loss component of the test specification will have been achieved.




