What Is Rvp In Fuel

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.

What is rvp in fuel.

Reid vapor pressure is the pressure exerted by a liquid to calculate the volatile nature of gasoline. Alabama rvp of 7 0 psi. Reid vapor pressure rvp. Reid vapor pressure rvp is a common measure of the volatility of gasoline and other petroleum products.

It is defined as the absolute vapor pressure exerted by the vapor of the liquid and any dissolved gases moisture at 37 8 c 100 f as determined by the test method astm d 323 which was first developed in 1930 2 and has been revised several times the latest version is astm d323 15a. 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 or rvp refers to a standardized laboratory test that measures vapor pressure at 100f. Reid vapor pressure is a common measure of the volatility of gasoline.

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. One method for checking a fuel s vapor forming tendency is by the reid vapor pressure method. It is determined by a test known as astm d 323. Reid vapor pressure is measured in gauge pressure and is stated in psi units.

Rvp is an abbreviation for reid vapor pressure a common measure of and generic term for gasoline volatility. The pressure is exerted at a specific temperature that is 100 degrees fahrenheit. Vapor pressure is an important quality specification for gasoline. 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.

For gasoline vapor pressure is important for both performance and environmental reasons. Specifically vapor pressure is a measure of the volatility of a fuel or the degree to which it vaporizes at a given temperature. Implementation of alabama s 7 0 psi gasoline rvp rule was suspended when epa approved alabama s request to move the rule to the contingency measure portion of the sip for the birmingham area. The more volatile a gasoline higher rvp the easier it evaporates.

See 77 fr 23619 april. 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.