Temperature Flammable Limits of Methanol Unleaded Gasoline Mixtures

The wider flammable limits of methanol compared to unleaded gasoline impose additional safety concerns when storing nearly neat methanol fuels. The upper flammable limit temperatures (UFLT) of various methano1/gasoline fuels were determined. An excellent correlation between the UFLT of methanol/gasoline mixtures and their dry Reid vapor pressures (RVP) was obtained. It is now possible to predict the upper temperature limit of the flammability range of methano1/unleaded gasoline fuels from a knowledge of their dry RVPs.

The lower flammable limit temperatures were also determined. A good correlation was obtained between the lower flammable limit temperature and the dry RVP.