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the most from your RVP analyzer.
The U.S. Environmental Protection Agency and the California Air Resources Board have issued tighter limits on Reid Vapor Pressure (RVP) in Blended Gasoline. The costs to refiners resulting from these new rules are estimated to be over $200 million/year.
An increase in accuracy of each tenth of a pound (0.1 psi) in the RVP measurement can save an average refinery several hundred thousand dollars per year. This has brought about the need not only to reliably measure RVP on-line, but also to prove the repeatability of the analysis.
The Stammen & Associates RVP Validation System connected to an ABB Model 4100 Low Range (0-20psi) RVP analyzer will automatically prove the repeatability of the analyzer online.
The system consists of a constant pressure cylinder containing a pure validation material with a known RVP value, a double-block and bleed valve manifold with leak detection, sample pressure regulator and PLC with touch screen display.
The PLC monitors the analyzer cycle time, alarm status, and output signal. A man-machine interface allows an operator to conveniently enter data as well as monitor and control all aspects of the validation process.
The sample or validation material is selected by the PLC and flows through the double block and bleed valve and pressure regulator to the analyzer. This minimizes sample transport time, yet conserves validation material. The pressure regulator insures all samples to the analyzer are injected at the same pressure.
The PLC can be programmed to start validation by an external contact closure or by time of day and the day of the week.