FUEL SYSTEM AND METHOD

摘要

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.