Patent ID: 6527002
Filing Date: 2003-03-04
Classification: B64D,B65D,B67D,C12H,Y10T

Abstract:
Apparatus for use with a container for storing a substance comprising:bladder means arranged to be located in the container above the substance stored therein, pipe means to deliver inflation medium to said bladder means, pressure control means to supply inflation medium to said bladder means via said pipe means, first pressure relief means to allow escape of inflation medium from said bladder means to relieve pressure from said bladder means, said first pressure relief means is set to a first selected pressure that is higher than the vapor pressure of the substance in the container, and second pressure relief means to allow escape of vapor of the substance from the container to relieve pressure from the container, said second pressure relief means is set to a second selected pressure that is higher than said first selected pressure, wherein said pressure control means is arranged to control supply of inflation medium to said bladder means to maintain the pressure in said bladder means above the vapor pressure of the substance in the container and said bladder means substantially fills the space above the substance in said container, said first pressure relief means is arranged to relieve pressure build-up in said bladder means to maintain the pressure in said bladder means at or below said first selected pressure, and said second pressure relief means is arranged to relieve pressure build-up in the container to maintain the pressure in the container at or below said second selected pressure.