Is there any calculation that can be performed to estimate the amount of water a well water pressure tank should output between pump cycles? E.g.- I have a 40 gallon pressure tank (non bladder) with a pump switch set to 40psi on, 60psi off. I suspected the tank was water logged, as when taking a shower, the pump would kick in every 15-20 seconds, which seemed short. I ended up draining it, pressurizing the empty tank to 35 psi, then having the pump refill it, and now I am getting 2-3 minutes between pump cycles, so obviously recharging the tank was helpful.
This worked out great, but was more of a gut feeling. Is there any calculation to see if a pressure tank has too little air? (i.e.- something like my system should output XX gallons between pump cycles).