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ARID Technologies, Inc
323 S. Hale Street
Wheaton, IL 60187
tel:(630) 681-8500
fax:(630) 681-8505

Membranes, Molecules and the Science of Permeation

Verification of ARID’s evaporative loss model
ARID’s model was tested against measured results from a field evaluation that was conducted last spring. The evaluation was done by TUV, Rheinland (Institute for Environmental Protection and Energy Technology) of Cologne, Germany (Ref: Eignungsprufung eines Gasruckfuhrsystems mit Vaconovent, July 1998, Dieter Hassel, Detlef Plettau, Werner Hasselbach and Jens Hunsinger).

Prototype System Field Test Results:
A. System Measurements Performed by TUV, Rheinland, Cologne, Germany V/L = 1.5 RVP = 10.16 psia (summer grade gasoline) Storage Tank Liquid Temperature = 59 F True Vapor Pressure = 5.18 psia Headspace Equilibrium Concentration = 35 percent

Mass Balances: May 4, 1998: Volume Dispensed = 4,005 L Feed = 3384 L, percent HC = 29.3, g HC = 2699 Retentate = 1515 L, percent HC = 1.24, g HC = 51.3 Permeate = 1869 L, percent HC = 51.4, g HC = 2616

April 27-28, 1998: Volume Dispensed = 3,599 L Feed = 2979 L, percent HC = 28.3, g HC = 2297 Retentate = 1148 L, percent HC = 0.52, g HC = 16.2 Permeate = 1831 L, percent HC = 45.8, g HC = 2281

Measured Vent Emission Values: May 4, 1998: 5.61E-03 lb HC/gallon dispensed April 27-28, 1998: 5.31E-03 lb HC/gallon dispensed

B. Average Value: (5.61E-03 + 5.31E-03)/2 = 5.46E-03 lb HC/gallon dispensed

C. Predicted Value from ARID’s mathematical Evaporative Loss Model (ELM): 5.55E-03 lb HC/gallon dispensed

D. Model Accuracy: 5.46/5.55 = 98.4 percent

E. Actual Emissions: (Assuming No Membrane System Installed) 4.91 Tons/yr-station @ 150,000 gallons per month = 1,890 gallons/yr-station

F. Membrane System Recovery Efficiency:
May 4, 1998: 97 percent (2,616/2,699)
April 28, 1998: 99 percent (2,281/2,297)

The two key points from the data are:
1. ARID’s Evaporative Loss Model predicted quantities of vapor generation to within 1.6 percent of the actual figures; and

2. The membrane system exhibited a vapor recovery efficiency of 97 percent and 99 percent. The system has been approved for safe operation by the German PTB, a group analogous to Underwriters Laboratories Inc. Also, the system is certified for recovery efficiency by TUV Rheinland.
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