Published: Jan 2008
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ANOTHER PROPERTY CHARACTERISTIC OF PETRO leum products that is closely associated with distillation parameters is vapor pressure. More often than not, the performance of various petroleum products, especially those used in transportation fuel applications, are very much dependent on synergistic parameters involving distillation and vapor pressure data. As mentioned in Chapter 1, the measurement of vapor pressure characteristics of petroleum products began with ASTM D323-30T “Standard Test Method for Vapor Pressure of Natural Gasoline (Reid Method)” . This test method has withstood the test of time and exists today essentially as the same test method originally published as a tentative method 75 years ago. Various test methods for measuring vapor pressure have come into use within the petroleum industry since that time. In 1991, a number of automatic test methods for vapor pressure measurement have gained approval in the industry, and technological advances in automatic vapor pressure measurements have dominated the market place, especially with the stringent requirements of regulations to protect the environment. This chapter will discuss the relevant details of the latest versions of the various vapor pressure measurement test methods currently available and in use in the petroleum industry. Details that would serve to provide a better understanding or clarification of the test methods will be discussed.
Montemayor, Rey G.
Chief Chemist, Imperial Oil Ltd., Sarnia, Ontario