1. What is the Orifice Size Calculation?

The orifice size calculation determines the optimal nozzle opening size for a pressure washer based on water flow rate (GPM) and pressure (PSI). This ensures proper water flow and pressure for efficient cleaning.

2. How Does the Calculator Work?

The calculator uses the orifice size formula:

Where:

• \( GPM \) — Water flow rate in gallons per minute
• \( PSI \) — Water pressure in pounds per square inch
• \( 0.0167 \) — Conversion factor

Explanation: The equation calculates the diameter of the orifice needed to maintain the specified flow rate at the given pressure.

3. Importance of Orifice Size

Details: Proper orifice sizing is crucial for pressure washer performance. Too small and pressure increases while flow decreases; too large and pressure drops while flow increases.

4. Using the Calculator

Tips: Enter flow rate in GPM and pressure in PSI. Both values must be positive numbers. Typical residential pressure washers operate at 1.5-2.5 GPM and 1500-3000 PSI.

5. Frequently Asked Questions (FAQ)

Q1: Why is orifice size important?
A: Correct orifice size ensures optimal balance between pressure and flow rate for effective cleaning without damaging surfaces.

Q2: What are typical orifice sizes?
A: Common sizes range from 0.0025 to 0.025 inches depending on GPM and PSI requirements.

Q3: How does orifice size affect pressure?
A: Smaller orifices increase pressure but reduce flow rate, while larger orifices decrease pressure but increase flow.

Q4: Can I use this for other fluids?
A: This calculation is specifically for water. Other fluids would require different formulas accounting for viscosity and density.

Q5: What if my pressure washer has multiple nozzles?
A: The calculation applies to each individual nozzle. Total flow is the sum of all nozzles' flow rates.