Enter the tank head (ft) and the density of fluid (lb/ft^3) into the calculator to determine the Expansion Tank Pressure. 

Expansion Tank Pressure Formula

The following formula is used to calculate the Expansion Tank Pressure. 

Ptank = Ht * D / 144

  • Where Ptank is the Expansion Tank Pressure (psi)
  • Ht is the tank head (ft) 
  • D is the density of fluid (lb/ft^3) 

How to Calculate Expansion Tank Pressure?

The following two example problems outline how to calculate the Expansion Tank Pressure.

Example Problem #1:

  1. First, determine the tank head (ft). In this example, the tank head (ft) is given as 3.5.
  2. Next, determine the density of fluid (lb/ft^3). For this problem, the density of fluid (lb/ft^3) is given as 1225.
  3. Finally, calculate the Expansion Tank Pressure using the equation above: 

Ptank = Ht * D / 144

Inserting the values from above and solving the equation: 

Ptank =3.5 * 1225 / 144 = 29.77 (psi)

Example Problem #2: 

Using the same process as above, first define the variables required by the formula. In this case, these values are:

tank head (ft) = 5

density of fluid (lb/ft^3) = 1055

Entering these values yields:

Ptank = 5 * 1055 / 144 = 36.631 (psi)