Reid Vapor Pressure of Gasoline

[nasir410]

What is the Reid vapor pressure and why it is measured?

[Nasir Hussain]

Reid vapor pressure (RVP) is the measure of the volatility of gasoline or other petroleum products and is defined as the absolute vapor pressure exerted by the vapor of the liquid and any dissolved gases at 37.8 °C (100 °F) and is defined in PSI or Kilopascal.
It is important to measure to avoid high levels of vaporization so that products are not lost to atmosphere or the pumps are vapor locked. Moreover, in winter low vapor pressure may cause difficulty in starting the engine. Therefore, oil refineries control the RVP seasonally to maintain gasoline engine reliability.
ASTM D323, test method is applied to measure the RVP of crude oil and petroleum refined products.

[Muhammad Usman Khalid]

It is defined as the absolute vapor pressure exerted by the vapors of the gasoline at 37.8 °C in a volume of air 4 times the volume of liquid.
It is the measure of volatility and vapor lock tendency of motor gasoline fuel. Sufficient RVP is needed in order to facilitate the starting of an internal combustion engine.
This property measures the vapor-lock tendency of motor gasoline in which excessive vapors are produced in the fuel line causing interruption of the supply of liquid fuel to the engine.
It also indicates the explosion and evaporation hazards of the fuel. ASTM D-323 is a standard method to measure the RVP in the laboratory.

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