2 replies to this topic

[robotan]

hello

 

i want to know what effect of Non-standard Reid vapor pressure (very low or very high value of TVR) of gasoline in engines.

 

thanks

[Pilesar]

You can think of Reid Vapor Pressure (RVP) as a measurement of C4. Mixing butanes into gasoline can help improve many of the parameters that gasoline is measured by. However, the butanes tend to vaporize, with the fuel remaining in the liquid state changing character and perhaps no longer meeting specifications. The RVP spec is designed so that the fuel buyers are not tricked by the fuel sellers into purchasing what is essentially off-spec gasoline mixed with butanes. You can estimate the amount of butanes in the gasoline directly from the RVP reading. For example, if the fuel has an RVP of 4 psi, you can estimate there is about 4% C4 in the fuel. I think there is usually not a minimum RVP spec for fuel -- only a maximum RVP allowed. The fuel behavior in the engine is better characterized by Research Octane Number (RON) and Motor Octane Number (MON). If the RON and MON are the same for two fuels, the engine will not be affected if the fuels have a different RVP.

[robotan]

You can think of Reid Vapor Pressure (RVP) as a measurement of C4. Mixing butanes into gasoline can help improve many of the parameters that gasoline is measured by. However, the butanes tend to vaporize, with the fuel remaining in the liquid state changing character and perhaps no longer meeting specifications. The RVP spec is designed so that the fuel buyers are not tricked by the fuel sellers into purchasing what is essentially off-spec gasoline mixed with butanes. You can estimate the amount of butanes in the gasoline directly from the RVP reading. For example, if the fuel has an RVP of 4 psi, you can estimate there is about 4% C4 in the fuel. I think there is usually not a minimum RVP spec for fuel -- only a maximum RVP allowed. The fuel behavior in the engine is better characterized by Research Octane Number (RON) and Motor Octane Number (MON). If the RON and MON are the same for two fuels, the engine will not be affected if the fuels have a different RVP.

thank you 

in our refinery when making gasoline and verifying compliance, several analyzes must be performed such as

 

density, RVP, octane number, distillation curve, etc. It is true that the octane number is an important parameter for the behavior of the engine but the other analyzes are no less important than the Octane Number and I think they directly affect the behaviour of the engine.