How do you test Reid Vapor Pressure?

The test procedure for gasolines and naphthas involves combining one part of chilled liquid sample at 36°F (2.6°C) with four parts of laboratory air at 70°F (21.4°C) in a bomb that has a pressure gauge attached to the lid.

How does Reid vapor pressure work?

Reid Vapor Pressure is the pressure exerted by a liquid to calculate the volatile nature of gasoline. The pressure is exerted at a specific temperature, that is, 100 degrees Fahrenheit. 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.

What is the difference between Reid vapor pressure and true vapor pressure?

True Vapor Pressure is the pressure of the vapor in equilibrium with the liquid at 100 F (it is equal to the bubble point pressure at 100 F). Reid Vapor Pressure is the vapor pressure of a chilled sample of gasoline or other fuel as measured in a test bomb at 100 F.

What does high Reid vapor pressure mean?

Higher RVP means the fuel forms more vapor… in other words, more fuel evaporates at 100F. Obviously, a lower RVP indicates less fuel evaporates at 100F.

Does gasoline have a high vapor pressure?

Most gasoline blendstocks have vapor pressures below the maximum specification for finished gasoline, so achieving the vapor pressure specification is not difficult. However, one of the highest vapor pressure blendstocks, butane, also happens to be very high in octane and very cheap relative to other blendstocks.

What does the Reid Vapor Pressure RVP test measure?

Reid Vapor Pressure, ASTM D323, is an ASTM test method which measures the vapor pressure of crude oil and petroleum refined products. Reid Vapor Pressure testing indirectly measures volatile petroleum solvent evaporation rates. The RVP test is not used for liquefied petroleum gases (LPG).

What is the fuel vapor rule?

RVP is an abbreviation for “Reid vapor pressure,” a common measure of and generic term for gasoline volatility. These rules reduce gasoline emissions of volatile organic compounds (VOC) that are a major contributor to ground-level ozone (smog). Phase I was applicable to calendar years 1989 through 1991.

What is the true vapor pressure of gasoline?

Depending on the state and month, gasoline RVP may not exceed 9.0 psi or 7.8 psi. EPA provides a 1.0 psi RVP allowance for gasoline containing with at least 9 volume percent ethanol and no more than 15 volume percent ethanol.

At what temperature does gasoline vapor lock?

When modern injection motors break down after traveling for a long distance, some might not be able to restart right away. This is because those new motors reach temperatures of up to 120–140 °C, and vapor lock is likely to occur at such high temperatures.

What is the Reid vapor pressure of water?

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 and has been revised several times (the latest version is ASTM D323-15a).

What level must the fuel tank be to test the EVAP system?

Generally speaking, the fuel tank must be 1/4 to 3/4 full because a near empty tank or a full tank can affect the accuracy of the EVAP self-test.

What kind of pressure test is Reid vapor pressure?

Reid Vapor Pressure testing (RVP) of crude oil, fuels, petroleum products, and solvents. Reid Vapor Pressure (RVP) testing for crude oil, fuel, other refined petroleum products, and petrochemicals is offered by Intertek labs on a global basis.

What should the vapour pressure be in a Reid vapour stabilizer?

Therefore, the separation in the stabilizer should be designed to yield a mixture with a true vapor pressure at 100 °F (37.8 °C) equal to the RVP requirement. This will yield a bottom product with an RVP slightly below the required RVP.

What kind of vapor pressure test is used?

Measuring the vapor pressure of volatile petroleum liquids, the ASTM D323 test analyzes petroleum products and crude oils. The ASTM D323 RVP test is used in various quality control and R&D applications.

What should the RVP be on a Reid debutanizer?

This will yield a bottom product with an RVP slightly below the required RVP. Typical RVP requirements for crude sales range from 10 to 12 psi (70 to 82 kPa) RVP. As the gasoline Reid vapor pressure (RVP) is reduced, the operation of the debutanizer becomes more critical.