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Generated February 18, 2018

Volatile organic chemical tank ullage pressure reduction

Patent Number: 5,626,649

Patent Information

Abstract
An apparatus reduces the pressure in a volatile chemical tank ullage including a first conduit for connection to the volatile chemical tank ullage, a vapor extractor, a pressure sensor to detect the pressure in the volatile chemical 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 volatile chemical 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 VOC detector to detect VOC concentrations in the vent, and a controller to receive inputs from the pressure sensor and the VOC 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 VOC-free air to be released through the vent, thereby reducing the pressure in the ullage.
Patent Number: 5,626,649
Issue Date: 1997-05-06

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Citations

Patents that cite this patent

Patent Title
9,108,837 Method and apparatus for monitoring for a restriction in a stage II fuel vapor recovery system
8,893,542 Fueling system vapor recovery and containment performance monitor and method of operation thereof
8,677,805 Method and apparatus for detecting a leak in a fuel delivery system
8,573,262 System and method for automatically adjusting an ORVR compatible stage II vapor recovery system to maintain a desired air-to-liquid (A/L) ratio
8,448,675 Method and apparatus for monitoring for a restriction in a stage II fuel vapor recovery system
8,402,817 Method and apparatus for monitoring for leaks in a stage II fuel vapor recovery system
8,327,689 Fueling system vapor recovery and containment performance monitor and method of operation thereof
8,191,585 Method and apparatus for monitoring for a restriction in a stage II fuel vapor recovery system
8,167,003 ORVR compatible refueling system
8,075,667 Fuel storage tank pressure management system and method employing a carbon canister
7,975,528 Fueling system vapor recovery and containment performance monitor and method of operation thereof
7,909,069 System and method for automatically adjusting an ORVR compatible stage II vapor recovery system to maintain a desired air-to-liquid (A/L) ratio
7,849,728 Fueling system vapor recovery and containment performance monitor and method of operation thereof
7,566,358 Fuel storage tank pressure management system and method employing a carbon canister
7,509,982 Vapor recovery system with improved ORVR compatibility and performance
7,275,417 Fueling system vapor recovery and containment performance monitor and method of operation thereof
7,174,926 Vapor recovery system with improved ORVR compatibility and performance
6,968,868 Fueling system vapor recovery and containment performance monitor and method of operation thereof
6,964,283 Fueling system vapor recovery and containment performance monitor and method of operation thereof
6,953,496 Sub-atmospheric fuel storage system
6,935,356 Underground storage tank metering system in a service station environment
6,929,038 Underground storage tank vapor pressure equalizer
6,929,037 Underground storage tank vapor pressure equalizer
6,929,018 Underground storage tank metering system in a service station environment
6,901,786 Fueling system vapor recovery and containment leak detection system and method
6,887,300 Cyclic membrane separation process
6,880,585 Fueling system vapor recovery and containment performance monitor and method of operation thereof
6,840,292 Apparatus and method to control excess pressure in fuel storage containment system at fuel dispensing facilities
6,810,922 Vapor recovery system with improved ORVR compatibility and performance
6,802,344 Fueling system vapor recovery and containment performance monitor and method of operation thereof
6,761,190 Underground storage tank vapor pressure equalizer
6,719,824 Cyclic membrane separation process
6,712,101 Hydrocarbon sensor diagnostic method
6,644,360 Membrane and sensor for underground tank venting system
6,622,757 Fueling system vapor recovery and containment performance monitor and method of operation thereof
6,532,999 Pressure sensor for a vapor recovery system
6,499,516 Vapor flow and hydrocarbon concentration sensor for improved vapor recovery in fuel dispensers
6,460,579 Vapor flow and hydrocarbon concentration sensor for improved vapor recovery in fuel dispensers
6,418,983 Vapor flow and hydrocarbon concentration sensor for improved vapor recovery in fuel dispensers
6,357,493 Vapor recovery system for a fuel dispenser
6,347,649 Pressure sensor for a vapor recovery system
6,338,369 Hydrocarbon vapor sensing
6,293,996 Fuel storage system with vent filter assembly

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