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Pressure Tank

Question asked by rseverini on Mar 31, 2020
Latest reply on Apr 1, 2020 by cdafd

We are designing a sprinkler system for which we are using a pressure tank as per NFPA 13 and NFPA 22 for a water supply.  Both of these standards have a formula which calculates the tank air pressure which is required based the proportion of air.  The code requires an approved means to automatically maintain the required air pressure.


Question:   Does the air pressure have to be maintained during the flow of sprinkler water in order for the last water to leave the tank at the required residual demand pressure which was calculated at tank discharge flange?