What Is Rvp In Fuel

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.

What is rvp in fuel.

Rvp reid vapor pressure vapour pressure. 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 a common measure of the volatility of gasoline.

For gasoline vapor pressure is important for both performance and environmental reasons. Reid vapor pressure is measured in gauge pressure and is stated in psi units. Specifically vapor pressure is a measure of the volatility of a fuel or the degree to which it vaporizes at a given temperature. Reid vapor pressure rvp is a common measure of the volatility of gasoline and other petroleum products.

Reid vapor pressure or rvp refers to a standardized laboratory test that measures vapor pressure at 100f. Alabama rvp of 7 0 psi. 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. The more volatile a gasoline higher rvp the easier it evaporates.

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 the pressure exerted by a liquid to calculate the volatile nature of gasoline. Rvp is a measure of how easily the fuel evaporates at a given temperature. Reid vapor pressure rvp.

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. Because the fuel rule was retained as a contingency measure it remains on the boutique fuel list. 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.

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.