GPM to PSI Calculator: Convert Flow Rate to Pressure

Convert gallons per minute (GPM) to pounds per square inch (PSI) based on flow rate and pipe characteristics. This calculator helps you determine the pressure required to achieve a specific flow rate in a pipe system.

Gallons per minute (GPM)
Internal diameter of the pipe
Total length of the pipe
Typical value: 0.02 for smooth pipes

Understanding GPM to PSI Conversion

Converting gallons per minute (GPM) to pounds per square inch (PSI) is essential for determining the pressure required to achieve a specific flow rate in a pipe system. This calculation helps in designing efficient fluid systems.

Key Factors in GPM to PSI Calculation

Several factors influence the pressure required to achieve a specific flow rate:

Factor Description Impact on PSI
Flow Rate (GPM) Volume of liquid moved per minute Higher GPM increases PSI
Pipe Diameter Internal diameter of the pipe Smaller diameter increases PSI
Pipe Length Total length of the pipe Longer pipes increase PSI due to friction
Friction Loss Resistance to flow in the pipe Higher friction loss increases PSI

Formula for GPM to PSI Conversion

The formula to calculate PSI from GPM is:

PSI = (GPM × Friction Loss × Pipe Length) / Area

Where:

  • GPM: Flow rate in gallons per minute
  • Friction Loss: Coefficient of friction loss in the pipe
  • Pipe Length: Total length of the pipe in feet
  • Area: Cross-sectional area of the pipe (π × radius²)

Common Applications

Application Typical GPM Range Typical PSI Range
Residential Water Supply 5 - 20 GPM 40 - 60 PSI
Irrigation Systems 10 - 50 GPM 30 - 50 PSI
Industrial Processes 50 - 500 GPM 50 - 100 PSI
Fire Protection 100 - 1000 GPM 100 - 150 PSI

Frequently Asked Questions

What is the relationship between GPM and PSI?

GPM measures flow rate, while PSI measures pressure. The relationship depends on pipe diameter, length, and friction loss.

How does pipe diameter affect PSI?

Smaller pipe diameters require higher pressure (PSI) to achieve the same flow rate (GPM) due to increased resistance.

What is friction loss?

Friction loss is the resistance to flow caused by the pipe's interior surface. It increases the required pressure to maintain flow.

Can I use this calculator for any fluid?

This calculator assumes water as the fluid. For other fluids, adjust for viscosity and density.

What is the typical friction loss coefficient?

For smooth pipes, the friction loss coefficient is typically around 0.02. For rough pipes, it may be higher.