Depending on the state and month, gasoline RVP was not to exceed 10.5 pounds per square inch (psi), 9.5 psi, or 9.0 psi. Phase II is applicable to 1992 and later calendar years. Depending on the state and month, gasoline RVP may not exceed 9.0 psi or 7.8 psi.
What does RVP stand for?
Reid vapor pressure. Jump to navigation Jump to search. Reid vapor pressure (RVP) is a common measure of the volatility of gasoline and other petroleum products.
What is Reid vapor pressure of gasoline?
Reid vapor pressure. Reid vapor pressure (RVP) is a common measure of the volatility of 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.
What is the RVP rating of gasoline?
The procedure, named for its originator, produces a numerical value called Reid vapor pressure (RVP). One batch of gasoline might show an RVP rating of 8.37; another might show a rating of 7.49, etc.
What is RVP volatility?
Volatility is the property of a liquid fuel that defines its evaporation characteristics. RVP is an abbreviation for "Reid vapor pressure," a common measure of and generic term for gasoline volatility.
What is the vapor pressure of diesel fuel?
Vapour pressure=1.. 10 kPa at 38 ºC for diesel and JP-4, 0.5.. 5 kPa at 38 ºC for kerosene.
What happens if the RVP is too low?
Vapor pressure - measured in terms of RVP - determines the amount of surface pressure required to keep gasoline from changing from liquid to gas. If the RVP is too low, there won't be enough hydrocarbon vapor available to start a cold engine.
What is Reid vapor pressure used for?
The Reid vapor pressure test is used to determine the front-end volatility of products in the gasoline through heavy reforming naphtha boiling point range. It correlates with the normal butane content of the sample and the RVP of gasoline blends is adjusted by adding or removing normal butane.
What does low RVP mean?
Low RVP gasoline means any gasoline which has a Reid vapor pressure of seven and eight-tenths (7.8) psi or less per gallon as determined in accordance with the appropriate sampling and testing methodologies set forth in 40 CFR 80*.
How can RVP be reduced?
The RVP of crude oil increases with the increasing presence of flammable gases and other volatile flammable liquid components (e.g., hexanes). OTA's VRT-Max is a great solution to lowering RVP.
Is low fuel volatility good?
Low fuel volatility increases fuel rich areas and increases soot formation [17, 18]. However, it is observed that the 7% and 15% oxygen fuels produce lower soot emissions than the 0% oxygen fuel. ...
What is the difference between vapor pressure and Reid vapor pressure?
One measurement is the true vapor pressure, which is the pressure without any air present. A measurement used by the petroleum industry is the Reid vapor pressure, which measures the vapor pressure in a closed container at one temperature, without first removing the air.
How do you calculate Reid vapor pressure?
automatically. programmed correction factor. RVP psi = (0.956 * X)−0.347. 2.39 where: X = total measured vapor pressure in psi or kPa 9.3Record the RVP to the. nearest 0.01 psi (0.07 kPa) as the official test result. 9.4EPA will use the above method as the official vapor pressure test.
What does RVP test measure?
Reid vapor pressure (RVP) is a common measure of the volatility of gasoline and other petroleum products.
Does ethanol increase RVP?
Ethanol's Effect on Fuel Volatility The addition of 10 percent ethanol (E10) to gasoline raises RVP by approximately 1 pound per square inch (psi).
What is the difference between summer fuel and winter fuel?
Under pressure A primary difference between winter- and summer-blend gas is their Reid Vapor Pressure (RVP). RVP is a measure of how easily the fuel evaporates at increased temperatures. The higher the fuel's RVP, the more easily it evaporates. Winter-blend fuel requires increased RVP.
What's the difference between summer and winter-blend fuel?
Winter-blend gas has a higher RVP because the fuel must be able to evaporate at low temperatures for the engine to operate properly. Summer-blend gas has a lower RVP to prevent excessive evaporation when outside temperatures rise.
When did the EPA issue the RVP waiver?
On September 5 , EPA issued an emergency waiver of the federal 7.8 psi Reid Vapor Pressure (RVP) and ethanol requirements in Alabama, Louisiana, Georgia and North Carolina, and of the state RVP requirements in Georgia and Alabama, through September 15. Multi-State Fuel Waiver Concerning Alabama, Georgia, Louisiana, and North Carolina
When did the EPA waive the requirement for highway diesel fuel to be free of dye?
On October 12, 2018 , EPA waived the requirement for highway diesel fuel to be free of dye. This waiver applies to utility, emergency response and other diesel-powered highway vehicles responding to/assisting in recovery efforts in the panhandle area of Florida, through October 26, 2018. Diesel Fuel Waiver Concerning Florida.
When did the EPA waive the gasoline requirements?
In addition, EPA waived the Reformulated Gasoline (RFG) requirements in these same states. This waiver supersedes the August 31 waiver of the gasoline requirements for PADDs 1-3. Multi-State Fuel Waiver
When did the EPA waive the sulfur fuel requirement in Puerto Rico?
On October 27, EPA waived requirements to allow the use of high sulfur heating oil and marine fuel in mobile nonroad generators or pumps used for emergency purposes in Puerto Rico, through November 15. Second Extension Fuel Waiver Concerning Puerto Rico
When will the EPA stop requiring diesel in Texas?
On March 5, EPA issued a waiver of the Texas Low Emission Diesel (TxLED) requirements that apply in certain counties of Texas, through March 25, 2021. This was part of the EPA’s response to continued diesel supply issues in certain counties of Texas from the unusually severe temperatures and frozen precipitation.
When did Florida get the red dyed fuel waiver?
Fuel Waiver Concerning Florida. On August 30, 2019 , EPA issued a new emergency waiver to allow the use of red dyed 15 parts per million sulfur non-road locomotive and marine diesel fuel in diesel-powered highway vehicles in the State of Florida. Fuel Waiver concerning red dyed 15 parts.
What is a fuel waiver?
EPA, working with the Department of Energy, responds quickly to address fuel supply disruptions caused by, for example, refinery or pipeline infrastructure damage as the result of a hurricane or other natural disaster, by issuing emergency waivers of certain fuel standards in affected areas.
What is the RVP rating of gasoline?
One batch of gasoline might show an RVP rating of 8.37; another might show a rating of 7.49, etc. The higher the number, the higher the volatility. Environmental regulations in some states prohibit the sale of gasoline with an RVP in excess of a specified number, particularly during the summer months.
How to determine volatility of a batch of gasoline?
The accepted method for determining the volatility of a batch of gasoline is a laboratory procedure that measures the pressure of the gasoline’s vapors. The procedure, named for its originator, produces a numerical value called Reid vapor pressure (RVP).
Can gasoline cause vapor lock?
This, in turn, can contribute to air pollution and can also cause vapor lock in engines during the summer months. Environmental regulators have adopted rules which limit the degree of volatility present in gasoline in certain regions at certain times of the year.
Does gasoline vaporize in hot weather?
This makes the gasoline vaporize more easily, a characteristic desirable in cold weather. In hot weather, however, gasoline with an excess of volatility tends to emit more vapors during transfer operations. This, in turn, can contribute to air pollution and can also cause vapor lock in engines during the summer months.
