![]() ![]() There are no published studies related to tank rupture / buckling where the cause for such a failure has been attributed to insufficient vent / PVRV sizing based on lower thermal in-breathing / out-breathing rates. One argument against the use of equations in 6th and 7th edition for thermal breathing (in-out) is that the tanks which were built in the earlier period (prior to publishing of these equations) and based on the tabular thermal inbreathing / outbreathing rates of API 2000 -1998 are existing and operating satisfactorily without any incident of overpressure rupture or vacuum buckling. This is an addition from 6th to 7th edition. While the 6th edition does not give details about normal outbreathing related to volatile liquids (vapor pressure >5.0 kPa), the 7th edition provides a separate equation for normal outbreathing (Eqn 3). ![]() ![]() The equations have not changed from 6th to 7th edition. ![]()
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