1. What is PSI from Head Calculation?

Definition: This calculator determines the pressure in psi (pounds per square inch) based on the height of a fluid column and its specific gravity.

Purpose: It's commonly used in hydraulics, plumbing, and engineering to convert head (height) measurements to pressure units.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( P_{psi} \) — Pressure in pounds per square inch (psi)
• \( h_{ft} \) — Head or height of fluid column in feet (ft)
• \( SG \) — Specific gravity of the fluid (dimensionless)
• 0.433 — Conversion factor (psi per foot of water)

Explanation: The pressure at the bottom of a fluid column is proportional to the height of the column and the fluid's density (represented by specific gravity).

3. Importance of Head to PSI Conversion

Details: Understanding this relationship is crucial for designing piping systems, pumps, and hydraulic equipment where pressure measurements are needed.

4. Using the Calculator

Tips: Enter the head in feet and specific gravity (default 1.0 for water). All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What is specific gravity?
A: Specific gravity is the ratio of a fluid's density to the density of water (1.0). For example, mercury has SG ≈ 13.6.

Q2: Why is the conversion factor 0.433?
A: This comes from the weight of 1 foot of water (0.433 psi/ft) at standard conditions.

Q3: Does this work for any fluid?
A: Yes, as long as you know the fluid's specific gravity relative to water.

Q4: How accurate is this calculation?
A: Very accurate for static conditions. For moving fluids, additional factors like velocity head may need consideration.

Q5: What's the pressure for 100 ft of water?
A: 100 ft × 1.0 × 0.433 = 43.3 psi (this is a good reference point to remember).