Tank ullage pressure control

Details Tank ullage pressure control Tank ullage pressure control

1997-03-04

1998-05-26

Spitzer, Robert

Gas separation: processes

With control responsive to sensed condition

Concentration sensed

95 19, 95 21, 95 98, 95105, 95146, 95111, 95113, 95122, 95130, 95144, B01D 53047

Patent

active

057558540

ABSTRACT:
The invention relates to an apparatus and method for controlling the pressure in a fuel tank ullage. The apparatus includes a vapor pump which withdraws vapors from the tank ullage responsive to a signal generated by a pressure sensor in communication with the ullage. The vapors are directed to a canister containing a VOC-adsorbent material where the VOC content of the vapor is removed. Non-polluting VOC-free air is vented from the canister to the atmosphere. The invention also contemplates the provision of a second canister which would accept the tank ullage vapors after the material in a first canister becomes saturated. A portion of the VOC-free air exiting the first canister is used a purge gas to regenerate the saturated material in the first canister. The operation of the multiple canisters would alternate between adsorption and regeneration until the tank ullage pressure is reduced to below a threshold level.

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