Gas separation: apparatus – Apparatus for selective diffusion of gases
Patent
1995-05-12
1998-12-01
Bushey, C. Scott
Gas separation: apparatus
Apparatus for selective diffusion of gases
55217, 55218, 55271, 55310, 95 12, 95 15, 95 22, 95 50, 96 6, 96173, 96174, B01D 6100
Patent
active
058432124
ABSTRACT:
An apparatus reduces the pressure in a fuel tank ullage including a first conduit for connection to the fuel tank ullage, a vapor extractor, a pressure sensor to detect the pressure in the fuel tank ullage, a separation module having an inlet connected to the first conduit, a separation membrane, a permeate outlet separated from the inlet by the separation membrane, and a retentate outlet, a second conduit connected to the permeate outlet for connection to the fuel tank, a vapor pump associated with the second conduit for creating a low pressure in the separation module near the permeate outlet as to induce selected vapors to pass through the separation membrane, a vent associated with the retentate outlet to vent retentate to atmosphere, a hydrocarbon detector to detect hydrocarbon concentrations in the vent, and a controller to receive inputs from the pressure sensor and the hydrocarbon detector and output control signals to the vapor extractor and the vapor pump to pull vapor from the ullage when the pressure exceeds a pressure threshold and return permeate to the tank and permit relatively hydrocarbon-free air to be released through the vent, thereby reducing the pressure in the ullage.
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Bushey C. Scott
Gilbarco Inc.
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