How To Calculate Discharge Pressure Of Pump

Discharge Pressure Equation:

\[ PDP = SP + (H \times SG \times 0.433) \]

Discharge Pressure (PDP):

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1. What Is Discharge Pressure Of Pump?

Discharge Pressure (PDP) is the total pressure at the outlet of a pump, calculated as the sum of suction pressure and the pressure generated by the pump head. It represents the total energy imparted to the fluid by the pumping system.

2. How Does The Calculator Work?

The calculator uses the discharge pressure equation:

\[ PDP = SP + (H \times SG \times 0.433) \]

Where:

\( PDP \) — Discharge Pressure (psi)
\( SP \) — Suction Pressure (psi)
\( H \) — Head (ft)
\( SG \) — Specific Gravity (unitless)
\( 0.433 \) — Conversion factor (psi/ft)

Explanation: The equation calculates total discharge pressure by adding suction pressure to the pressure generated by the pump head, accounting for fluid density through specific gravity.

3. Importance Of Discharge Pressure Calculation

Details: Accurate discharge pressure calculation is essential for proper pump selection, system design, ensuring adequate flow rates, and preventing cavitation or system overpressure.

4. Using The Calculator

Tips: Enter suction pressure in psi, head in feet, and specific gravity (typically 1 for water). All values must be valid (suction pressure ≥ 0, head ≥ 0, SG > 0).

5. Frequently Asked Questions (FAQ)

Q1: What Is The Significance Of Specific Gravity In This Calculation?
A: Specific gravity accounts for fluid density differences compared to water. Higher SG fluids require more pressure to achieve the same head.

Q2: What Are Typical Discharge Pressure Ranges?
A: Discharge pressure varies widely by application, from 20-50 psi for residential water systems to thousands of psi for industrial processes.

Q3: How Does Suction Pressure Affect Discharge Pressure?
A: Higher suction pressure directly increases discharge pressure, reducing the pump's workload and energy consumption.

Q4: What Is The 0.433 Conversion Factor?
A: This factor converts feet of head to psi for water at standard conditions (1 ft water column = 0.433 psi).

Q5: When Should This Calculation Be Used?
A: Use for centrifugal pump sizing, system pressure analysis, troubleshooting pump performance, and ensuring system components can handle expected pressures.