1944-01-01

Studies of Fuels and Fuel System Phenomena Contributing to AVIATION VAPOR LOCK 440198

IT takes only a small amount of vapor to cause vapor lock in aviation fuel systems, and this trouble may even occur far below the boiling point of the fuel, especially when dissolved air is present in the fuel.
Although the solubility of air in aviation fuel is not great, the vapor formation accompanying its evolution may be out of all proportion to the amount present.
The equilibrium amount of vapor that a gasoline will form for given initial and final conditions of temperature and pressure may be predicted by means of an equation presented herein by the authors.
With a knowledge of the temperature and pressure characteristics of a given fuel system, the vapor-liquid conditions existing throughout the system can be estimated in those cases where the initial condition of the fuel with respect to air saturation is known.

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