Showing papers on "Ullage published in 1997"

Fire safety system

Abstract: A system for preventing and suppressing fires and explosions is provided that fills the ullage spaces in fuel tanks with an inert gas that is generated by the operating system or facility. This insert gas is a combustion gas that is depleted of readily combustible oxygen and that is supplied at a pressure exceeding the ambient and displaces any oxygen in the ullage to a level that inhibits combustion in the fuel tank.

Method to prevent explosions in fuel tanks

Abstract: A method for preventing explosions in closed tanks which hold flammable liquids and flammable vapors and air above these liquid fuels comprising filling the ullage with a pressurized gas which not only excludes oxygen from the ullage but also prevents transmission of fire initiating sparks. The method further comprises filling the ullage with an electronegative gas alone or in combination with an inert gas or gases. More specifically, the preferred electronegative gas is sulfur hexafluoride (SF 6 ) which may also be used in combination with CO 2 and/or N 2 . More particularly, the method is directed to the prevention of explosions in aircraft fuel tanks.

Overpressure valve for storage tanks

Abstract: The invention provides an overpressure valve for controlling supply of liquid to a tank, said valve comprising a diaphragm 23 one side of which is adapted to be connected to the ullage of the tank, said diaphragm being linked to a first sleeve 27 which is movable in relation to a second sleeve 28 under the influence of pressure applied to the diaphragm, the first and second sleeves each having at least one port 29, 30, 30a which allows liquid to pass through the valve when the ports are aligned.