Abstract
In an attempt to reduce the release of gasoline vapors into the atmosphere, the U.S. Environmental Protection Agency (EPA) has placed restrictions on the volatility of commercial gasoline. In particular, they have set an upper specification limit on the gasoline's volatility as measured by the Reid vapor pressure (RVP). Exceeding the EPA's upper specification limit may result in a fine to the refiner. While there is no lower specification limit imposed by the EPA, lower RVP values require greater production costs. This article describes the efforts of one refiner to meet the EPA requirements with minimum economic disbenefit. Various statistical tools were used during this effort. The paper demonstrates a variety of successful SPC applications in the continuous process industry.
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