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

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## 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)

To calculate the expansion tank pressure, multiply the tank head by the density, then divide by 144.

## How to Calculate Expansion Tank Pressure?

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

**Example Problem #1:**

- First, determine the tank head (ft). In this example, the tank head (ft) is given as 3.5.
- Next, determine the density of fluid (lb/ft^3). For this problem, the density of fluid (lb/ft^3) is given as 1225.
- 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)