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Choose a pressure washer that is best for the job. Different housing materials can withstand various water pressures. The size, or spray power, ranges from 1,200 to 3,000 pounds per square inch (psi).
PSI is determined by orifice size of the nozzle tip and the flow rate (gallons per minute). For labeling purposes, the standard nozzle size for measurement is a #4 orifice. This size delivers 0.4/gpm at 40psi and 4.0/gpm at 4,000psi.As nozzle sizes increase or decrease, PSI fluctuates accordingly.hemicals. Water Pressure-PSI. Water pressure from the pressure washer is measured in pounds per square inch or PSI. This pressure is the amount of force delivered to the surface being cleaned, and is the critical factor in breaking debris from the surface being cleaned.