How To Calculate Pump Discharge Pressure

Pump Discharge Pressure Formula:

\[ P_{discharge} = P_{suction} + \frac{density \times g \times h}{144} + losses \]

Suction Pressure (P_suction):

psi

Density:

lb/ft³

Gravity (g):

ft/s²

Height (h):

Losses:

psi

Discharge Pressure (P_discharge):

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1. What Is Pump Discharge Pressure Calculation?

Pump discharge pressure calculation determines the pressure at the outlet of a pump by accounting for suction pressure, fluid density, gravitational acceleration, elevation head, and system losses. This is essential for proper pump selection and system design.

2. How Does The Calculator Work?

The calculator uses the pump discharge pressure formula:

\[ P_{discharge} = P_{suction} + \frac{density \times g \times h}{144} + losses \]

Where:

\( P_{suction} \) — Suction pressure at pump inlet (psi)
\( density \) — Fluid density (lb/ft³)
\( g \) — Gravitational acceleration (ft/s²)
\( h \) — Elevation head (ft)
\( losses \) — Pressure losses in the system (psi)

Explanation: The formula calculates the total pressure the pump must generate by adding suction pressure, static head pressure (converted from ft to psi), and system pressure losses.

3. Importance Of Pump Discharge Pressure Calculation

Details: Accurate pump discharge pressure calculation is crucial for ensuring proper pump operation, preventing cavitation, maintaining system efficiency, and selecting appropriate pump specifications for various applications.

4. Using The Calculator

Tips: Enter suction pressure in psi, fluid density in lb/ft³, gravitational acceleration in ft/s² (standard is 32.174 ft/s²), elevation head in ft, and system losses in psi. All values must be valid non-negative numbers.

5. Frequently Asked Questions (FAQ)

Q1: Why is the division by 144 necessary in the formula?
A: The division by 144 converts the pressure from lb/ft² to psi, since 1 psi = 144 lb/ft².

Q2: What are typical values for gravitational acceleration?
A: Standard gravitational acceleration is 32.174 ft/s², but this may vary slightly based on location and altitude.

Q3: How do I determine system losses?
A: System losses include friction losses in pipes, fittings, valves, and other components, typically calculated using engineering methods or manufacturer data.

Q4: Can this calculator be used for all types of pumps?
A: This formula is generally applicable to centrifugal and positive displacement pumps, but specific pump characteristics should be considered for precise calculations.

Q5: What units should I use for density?
A: Density must be entered in pounds per cubic foot (lb/ft³) for proper calculation with the other imperial units in the formula.