Standard Test Method for Vapor Pressure of Petroleum Products (Mini Method)Přeložit název
NORMA vydána dne 1.6.2018
Označení normy: ASTM D5191-18
Datum vydání normy: 1.6.2018
Kód zboží: NS-897543
Počet stran: 8
Přibližná hmotnost: 24 g (0.05 liber)
Země: Americká technická norma
Kategorie: Technické normy ASTM
dry vapor pressure, gasoline, hydrocarbon-oxygenate blends, mini method, petroleum products, vapor pressure,, ICS Number Code 75.080 (Petroleum products in general)
|Significance and Use|
5.1 Vapor pressure is a very important physical property of volatile liquids.
5.2 The vapor pressure of gasoline and gasoline-oxygenate blends is regulated by various government agencies.
5.3 Specifications for volatile petroleum products generally include vapor pressure limits to ensure products of suitable volatility performance.
5.4 This test method is more precise than Test Method , uses a small sample size (1 mL to 10 mL), and requires about 7 min to complete the test.
1.1 This test method covers the use of automated vapor pressure instruments to determine the total vapor pressure exerted in vacuum by air-containing, volatile, liquid petroleum products, including automotive spark-ignition fuels with or without oxygenates and with ethanol blends up to 85 % (volume fraction) (see ). This test method is suitable for testing samples with boiling points above 0 °C (32 °F) that exert a vapor pressure between 7 kPa and 130 kPa (1.0 psi and 18.6 psi) at 37.8 °C (100 °F) at a vapor-to-liquid ratio of 4:1. Measurements are made on liquid sample sizes in the range from 1 mL to 10 mL. No account is made for dissolved water in the sample.
Note 1: The precision (see Section the precision using 250 mL containers was determined in a 2016 ILS.Note 2: Samples can also be tested at other vapor-to-liquid ratios, temperatures, and pressures, but the precision and bias statements need not apply. ) using 1 L containers was determined in a 2003 interlaboratory study (ILS);
Note 3: The ILS conducted in 1988, 1991, 2003, and 2016 to determine the precision statements in Test Method did not include any crude oil in the sample sets. Test Method , as well as IP 481, have been shown to be suitable for vapor pressure measurements of crude oils.
1.1.1 Some gasoline-oxygenate blends may show a haze when cooled to 0 °C to 1 °C. If a haze is observed in , it shall be indicated in the reporting of results. The precision and bias statements for hazy samples have not been determined (see ).
1.2 This test method is suitable for calculation of the dry vapor pressure equivalent (DVPE) of gasoline and gasoline-oxygenate blends by means of a correlation equation (see in ). The calculated DVPE very closely approximates the dry vapor pressure that would be obtained on the same material when tested by Test Method .
1.3 The values stated in SI units are to be regarded as standard. The values given in parentheses after SI units are provided for information only and are not considered standard.
1.4 1.5 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. 1.6 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
|2. Referenced Documents|
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