Needing to know the pressure in a water tank

[Mguidry43]

At work, we have a cylindrical tank that holds water. The tank is 5 feet round and about 6 feet long putting the highest part of the tank at about 6 feet off the ground. The tank holds 1000 gallons of water. There is a valve on the bottom that I am needing to test and I can’t seem to find a formula to give me the psi to test it on that would simulate it being filled with 1000 gallons of water. Any help is greatly appreciated

 

[gleem]

The max pressure at the bottom of the tank is equal to the pressure of the max depth of water above the valve.

 

[sophiecentaur]

The formula you need is:
P = ρ h g
I haven't put the numbers in but you can insert the values.
The density (ρ)
of water is about 62 pounds per cubic foot.
and g is about 32 ft/s²
That answer would be in pounds per square ft so you would need to divide by 12² for the pressure in pounds per square inch.
The area of the tank is not a factor so you just need to use the 6 feet depth.
Alternatively you can work on the fact that 1Atmosphere will support around 30 ft of water. Your 6ft tank will be about 1/5 of an Atmosphere and, in old money, 1Atmosphere is 14 lbs / inch²