I need help in figuring out a water pressure question. I would like to install a pressure tank to store water in my garage. The tank would have an inlet where the water would flow into the tank from the a city water source and would be around 60psi entering the tank. The tank would be completely full of water and the water would flow out an outlet from the bottom of the tank into my water heater and then into my house. The tank would only be used in an emergency situation and would have shut off valves/ bi pass valves before the storage tank and a spigot at the bottom of the tank to use the water if needed. The tank will hold approximately 250 gallons and will be 30" wide by 72" tall. The inlet pipe and outlet pipe are both 3/4".
I am concerned if the water enters the tank at 60 psi it will not leave the tank at 60psi. I think it would increase but I have heard the pressure will decrease due to the size of the tank.
Will the pressure increase or decrease?
Is there anything that can be done to maintain the pressure through the tank and system with out adding anything mechanical?
This is just not a concept I understand and want to make sure the system will work before spending money on a pressurized storage tank.