ASTM D5190 Vapor Pressure of Petroleum Products (Automatic Method)
ASTM D5190 Standard Test Method for Vapor Pressure of Petroleum Products (Automatic Method)
6. Apparatus
6.1 Automatic Vapor Pressure Instrument, the essential features describing the sample flow and operation of the automatic vapor pressure instrument is provided in Annex A1. Critical elements of the apparatus are included as follows:
6.1.1 Pressure Transducer, capable of operating in the range from 0 to 172 kPa (0 to 25 psi) with the resolution of 0.1 kPa (0.01 psi) and a minimum accuracy of +/-0.7 kPa (+/-0.10 psi).
6.1.2 Thermostatically Controlled Heater, capable of maintaining an oil bath surrounding the test chambers at 37.8 +/- 0.1°C (100 +/- 0.2°F) for the duration of the test.
6.1.3 Sample Cup, capable of holding up to 125 mL.
6.2 Iced-Water Bath or Air Bath, for chilling the test samples and sample cup to temperatures between 0 to 1°C (32 to 34°F).
7. Reagents and Materials
7.1 Purity of Reagents - Chemicals of at least 98 % purity shall be used in the calibration procedure (see Section 10). Unless otherwise indicated, it is intended that all reagents conform to the specifications of the Committee on Analytical Reagents of the American Chemical Society where such specifications are available. Lower purities may be used, provided it is first ascertained that the reagent is of sufficient purity to permit its use without lessening the accuracy of the determination.
NOTE 1 - Although higher purity chemicals in the 99 + % range are preferred for use in calibrations, the precision and bias statements (see Section 15) were derived with the minimum purity level stated in 7.1.
7.2 2,2-Dimethylbutane.
7.3 n-Hexane, (Warning - 2,2-Dimethylbutane, n-hexane is extremely flammable, harmful if inhaled. Skin irritant on repeated contact. Aspiration hazard).
7.4 n-Pentane, (Warning - 2,2-Dimethylbutane, n-pentane is extremely flammable, harmful if inhaled. Skin irritant on repeated contact. Aspiration hazard).
7.5 Toluene, (Warning - 2,2-Dimethylbutane, toluene are is extremely flammable, harmful if inhaled. Skin irritant on repeated contact. Aspiration hazard).
