1. What is a Water Tank Pressure Calculator?

Definition: This calculator determines the pressure at the bottom of a water tank based on water density, gravity, and water height.

Purpose: It helps engineers, plumbers, and tank designers ensure proper structural support and system design for water storage.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( P \) — Pressure at bottom (psi)
• \( \rho \) — Water density (lb/ft³, default 62.4)
• \( g \) — Gravity (32.174 ft/s²)
• \( H_t \) — Height of water column (ft)

Explanation: The formula calculates hydrostatic pressure by multiplying density, gravity, and height, then converts to psi by dividing by 144.

3. Importance of Water Pressure Calculation

Details: Accurate pressure calculations ensure tank structural integrity, proper pump selection, and safe system operation.

4. Using the Calculator

Tips: Enter water density (default 62.4 lb/ft³), gravity (default 32.174 ft/s²), and water height in feet. All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: Why is the result divided by 144?
A: The division converts lb/ft² to psi (pounds per square inch) since there are 144 square inches in one square foot.

Q2: Does temperature affect the calculation?
A: Yes, water density changes slightly with temperature, but 62.4 lb/ft³ is standard for room temperature.

Q3: What if my tank has multiple liquids?
A: Calculate each liquid layer separately and sum the pressures at each depth.

Q4: How does tank shape affect the pressure?
A: Pressure depends only on depth, not tank shape, but shape affects total force on the bottom.

Q5: Should I include atmospheric pressure?
A: This calculator gives gauge pressure. For absolute pressure, add 14.7 psi (atmospheric pressure).