• ARID’s PERMEATOR System Earns CARB Certification...
• PERMEATOR Systems to be Installed at ALL H-E-B Houston area sites...
• ARID Receives Certification from Maryland...
• Independent 3rd Party Field Testing Confirms...
• Texas ORVR Certification Approval...
• ARID Announces Completion of Study...
• ARID announces appointment...
• Vapor Recovery Around the World
• Retooling the Vapor Recovery System
• Membranes, Molecules and the Science of Permeation

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The hydrocarbon removal efficiency is calculated from the inlet and outlet mass. Efficiency can be calculated on an hourly basis using the total mass in and out for the hour or overall for the entire test period using the overall mass in and out.

The outlet volume during any one minute test interval is corrected to standard conditions using the formula:

The gallonage weighted average emission is calculated from the total amount of hydrocarbons emitted divided by the total amount of gasoline dispensed.

Where:
Ld = Gasoline loaded in gallons.

For recovery efficiency of the PERMEATOR®, the feed volume is calculated from the outlet volume, outlet hydrocarbon concentration, permeate hydrocarbon concentration and inlet hydrocarbon concentration.

Where:
HC_(in) = Hydrocarbon concentration at the inlet in %C₃ HC_(P) = Hydrocarbon concentration at the permeate in %C₃

The inlet mass during any one minute test interval is: