How To Calculate Pump Head From Discharge Pressure

Pump Head Formula:

\[ Head = \frac{Pressure \times 2.31}{SG} \]

Pump Head:

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1. What Is Pump Head Calculation?

Pump head calculation converts discharge pressure to equivalent head in feet, accounting for fluid specific gravity. This is essential for pump selection, system design, and performance analysis in fluid handling systems.

2. How Does The Calculator Work?

The calculator uses the pump head formula:

\[ Head = \frac{Pressure \times 2.31}{SG} \]

Where:

\( Head \) — Pump head in feet (ft)
\( Pressure \) — Discharge pressure in pounds per square inch (psi)
\( SG \) — Specific gravity of the fluid (unitless)
\( 2.31 \) — Conversion factor from psi to feet of water

Explanation: The formula converts pressure to equivalent fluid column height, adjusted for the fluid's density relative to water.

3. Importance Of Pump Head Calculation

Details: Accurate pump head calculation is crucial for proper pump selection, system design, energy efficiency optimization, and ensuring adequate flow rates in piping systems.

4. Using The Calculator

Tips: Enter discharge pressure in psi and specific gravity (1.0 for water). Ensure both values are positive numbers for accurate calculation.

5. Frequently Asked Questions (FAQ)

Q1: Why Use 2.31 As The Conversion Factor?
A: 2.31 is the conversion factor from psi to feet of water column (1 psi = 2.31 feet of water at standard conditions).

Q2: What Is Specific Gravity And How Do I Find It?
A: Specific gravity is the ratio of fluid density to water density. For water it's 1.0, for other fluids consult engineering tables or fluid properties databases.

Q3: When Should I Calculate Pump Head?
A: Calculate pump head during system design, pump selection, troubleshooting performance issues, or when analyzing existing pumping systems.

Q4: Are There Limitations To This Calculation?
A: This calculation assumes standard conditions and doesn't account for temperature effects, viscosity changes, or system losses beyond the pressure measurement point.

Q5: How Does This Relate To Total Dynamic Head?
A: This calculates discharge head only. Total dynamic head includes suction head, friction losses, and elevation differences throughout the entire system.