Reid Vapor Pressure

541 Words3 Pages
TITLE: MEASUREMENT OF REID VAPOUR PRESURE OBJECT: To measure the Reid vapour pressure of given sample. APPARATUS: Water Bath, Pressure Gauge (Calibrated In Bars), Liquid Chamber . SAMPLE: GASOLINE: THEORY: Vapour pressure of a liquid fuel may be defined as the pressure exerted by the vapour above the free surface of the liquid at the given temperature. For gasoline,volatile non-viscous petroleum product, it is determined by Reid method. This is the Pressure exerted by vapour when it is in equilibrium with the liquid under the condition of test. For liquefied petroleum gas, the procedure is different and the determination is done at 65 oc. The standard Reid apparatus consist of a fuel chamber connected to an air chamber of four times volume, and fitted with a pressure gauge. The gasoline chamber of the vapour pressure apparatus is filled with the chilled sample and connected to the air chamber at 100 F or other temperature. The apparatus is immersed in a constant temperature bath and is shaken periodically until equilibrium is reached. The “manometer reading” corresponding to the pressure, read on the gage attached to the apparatus, suitably corrected if the air chamber was initially at a temperature other than 100 F , is the Reid vapour pressure. This method provides for partial air saturation of products with Reid vapour pressure below 26 lb, for no air saturation for products above 26lb. PROCEDURE: • Sample transfer • Assembly of apparatus • Introduction of apparatus into bath • Measurement of vapour pressure • Preparation of apparatus for next test OBSERVATION: TEMPERATURE OF GASOLINE = -9 oc TEMPERATURE OF WATER BATH= 37.5 |TIME |PRESSURE READING
Open Document