What Is Rvp In Fuel

One method for checking a fuel s vapor forming tendency is by the reid vapor pressure method.

What is rvp in fuel.

Reid vapor pressure is measured in gauge pressure and is stated in psi units. It is defined as the absolute vapor pressure exerted by a liquid at 37 8 c 100 f as determined by the test method astm d 323. Rvp is an abbreviation for reid vapor pressure a common measure of and generic term for gasoline volatility. Reid vapor pressure or rvp refers to a standardized laboratory test that measures vapor pressure at 100f.

Winter blend fuel has a higher rvp because the fuel must be able to evaporate at low temperatures for the engine to operate properly especially when the engine is cold. Reid vapor pressure rvp. Reid vapor pressure is the pressure exerted by a liquid to calculate the volatile nature of gasoline. Specifically vapor pressure is a measure of the volatility of a fuel or the degree to which it vaporizes at a given temperature.

It is determined by a test known as astm d 323. Rvp is a measure of how easily the fuel evaporates at a given temperature. The pressure is exerted at a specific temperature that is 100 degrees fahrenheit. Rvp reid vapor pressure vapour pressure.

See 77 fr 23619 april. Astm international formerly known as the american society for testing and materials has several test procedures which dictate protocol for standardized laboratory testing of fuel vapor pressure including rvp. Reid vapor pressure is a common measure of the volatility of gasoline. The more volatile a gasoline higher rvp the easier it evaporates.

Because the fuel rule was retained as a contingency measure it remains on the boutique fuel list. Reid vapor pressure rvp is a common measure of the volatility of gasoline and other petroleum products. Epa regulates the vapor pressure of gasoline sold at retail stations during the summer ozone season june 1 to september 15 to reduce evaporative emissions from gasoline that contribute to ground level ozone and diminish the effects of ozone related health problems. Vapor pressure is an important quality specification for gasoline.

Fuels can contain components that yield high amounts of vapors which may affect starting warm up and tendency to vapor lock with high operating temperatures or high altitudes. Alabama rvp of 7 0 psi.