What is “PRESSURE DEW POINT”?
A. Pressure Dew Point – For a given pressure, the temperature at which water VAPOR will begin to condense INTO liquid water. Q. What pressure dew point do I need? A. First – here’s some information to help you understand pressure dew point: The lowest pressure dew point class for a refrigerated dryer is Class 4. Class 4 delivers a pressure dew point of +38°F. Refrigerated dryers should not operate below the Class 4 range because the water vapor will freeze in the dryer. The highest pressure dew point for a refrigerated dryer is Class 6. Class 6 delivers a pressure dew point of +50°F. The highest practical pressure dew point because higher pressure dew point causes condensation in downstream piping. WAYS TO DETERMINE PRESSURE DEW POINT: 1. Ask the Manufacturer what the pressure dew point (PDP) requirements are for your equipment. 2. You can CALCULATE PRESSURE DEW POINT TEMPERATURE you need. Here’s how: 1. Determine the lowest ambient temperature your compressed air piping system will be
