1. What is Pump Capacity?

Pump capacity (or flow rate) refers to the volume of fluid a pump can move per unit of time. It's a critical parameter in pump selection and system design, determining how much fluid can be transported through a piping system.

2. How Does the Formula Work?

The calculator uses the pump capacity formula:

Where:

• \( Q \) — Flow rate (m³/s)
• \( D \) — Diameter of the pump impeller (m)
• \( n \) — Rotational speed (rev/s)
• \( H \) — Head or pressure (m)
• \( g \) — Acceleration due to gravity (9.81 m/s²)

Explanation: The formula relates the physical dimensions and operating conditions of a pump to its theoretical maximum flow capacity.

3. Importance of Pump Capacity Calculation

Details: Accurate pump capacity calculation ensures proper system design, prevents overloading, and helps select the right pump for specific applications in water supply, industrial processes, and HVAC systems.

4. Using the Calculator

Tips: Enter diameter in meters, speed in revolutions per second, and head in meters. All values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: What's the difference between theoretical and actual pump capacity?
A: Theoretical capacity is the ideal maximum, while actual capacity accounts for efficiency losses, friction, and other real-world factors.

Q2: How does impeller diameter affect capacity?
A: Capacity increases with the square of the diameter - doubling diameter quadruples capacity (all else being equal).

Q3: What are typical units for pump capacity?
A: Common units include m³/s, liters/second, gallons/minute (GPM), or cubic meters/hour (m³/h).

Q4: Does fluid viscosity affect capacity?
A: Yes, this formula assumes water-like viscosity. Higher viscosity fluids will have lower actual capacity.

Q5: How does speed relate to capacity?
A: Capacity is directly proportional to speed - doubling speed doubles capacity.