Abstract:
An aircraft fuel tank ventilation system, comprising a refrigerative dehumidifying device (17) having a refrigerating element (21) in contact with air flowing between a vent (15) open to the atmosphere and a fuel tank (4, 5). Also, a method of dehumidifying air introduced into an aircraft fuel tank via the ventilation system, the method comprising directing atmospheric air from the vent into contact with the refrigerating element, and cooling the refrigerating element so as to remove water vapour from the air flowing from the vent towards the fuel tank by condensation.
Abstract:
An aircraft fuel tank ventilation system comprising a dehumidifying device (17) disposed in flow communication between a vent (15) open to the atmosphere and a fuel tank (4,5). Also, a method of dehumidifying air introduced into an aircraft fuel tank via a ventilation system, the method comprising directing atmospheric air through a dehumidifying device disposed in flow communication between a vent of the ventilation system and the fuel tank, which removes water vapour from the air flowing from the vent towards the fuel tank. Also, a method of regenerating a desiccant medium (22) used to dehumidify air introduced into an aircraft fuel tank via a ventilation system, the method comprising directing air through the desiccant medium so as to dry the desiccant medium. By effectively removing water from air entering the aircraft fuel tank, the content of water in the fuel tank can be kept low, which improves fuel system component reliability, reduces maintenance activities, and reduces microbiological contamination.
Abstract:
A fuel system comprising a liquid fuel tank, an engine, and a coalescing filter adapted to separate water from fuel, the filter having an inlet fluidically connected to the fuel tank, a first outlet fluidically connected to a fuel feed system for the engine, and a second outlet fluidically connected to the fuel tank, wherein the coalescing filter is adapted to discharge fuel filtrate from the second outlet and filtrand from the first outlet. Also, a method of removing water or ice from a fuel tank, the method comprising directing a flow of fuel from a fuel tank to a coalescing filter adapted to separate water from fuel, discharging filtrand from a first outlet of the coalescing filter to a fuel feed system for consumption by an engine, and discharging fuel filtrate from a second outlet of the coalescing filter and returning the fuel filtrate to the fuel tank.
Abstract:
A fuel system comprising a fuel tank (1), a vent tank (3) having a duct open to the ambient atmosphere, a first vent line (4, 5) fluidically connecting the fuel tank ullage to the vent tank (3), a gas drying system (8) including a pump (9) and a dehumidifying device (20) disposed within the vent tank, and a second vent line (13,14) fluidically connecting a dry gas outlet (12) of the dehumidifying device (20) to the ullage, wherein the pump (9) is operable to maintain a higher pressure within the ullage than in the vent tank (3) so as to drive vapour rich gas from the ullage into the vent tank via the first vent line (4,5). Also, a method of operating the fuel system and a method of retro - fitting the gas drying system in an existing fuel system. The gas drying system may optionally be a gas drying/inerting system.