ASTM D5191-18

This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation: D5191 − 15 D5191 − 18
Standard Test Method for
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Vapor Pressure of Petroleum Products (Mini Method)
This standard is issued under the fixed designation D5191; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
This standard has been approved for use by agencies of the U.S. Department of Defense.
1. Scope*
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 Note 1). 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 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. 10 mL.
No account is made for dissolved water in the sample.
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NOTE 1—An The precision (see Section 16interlaboratory study was) using 1 L containers was determined in a 2003 interlaboratory study (ILS);
conducted in 2008 involving 11 different laboratories submitting 15 data sets and 15 different samples of ethanol-fuel blends containing 25 volume %,
50 volume %, and 75 volume % ethanol. The results indicated that the repeatability limits of these samples are with in the published repeatability of this
test method. on this basis, it can be concluded that the precision using 250 mL containers was determined in a 2016 ILS.D5191 is applicable to
ethanol-fuel blends such as Ed75 and Ed85 (Specification D5798) and other ethanol-fuel blends with greater than 10 v% ethanol. See ASTM RR:
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D02–1694 filed with ASTM for supporting data.
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.
NOTE 3—The interlaboratory studies ILS conducted in 1988, 1991, 2003, and 20032016 to determine the precision statements in Test Method D5191
did not include any crude oil in the sample sets. Test Method D6377, 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 8.5, it shall be
indicated in the reporting of results. The precision and bias statements for hazy samples have not been determined (see Note 15).
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 Eq 1 in 14.2). The calculated DVPE very closely approximates the dry vapor
pressure that would be obtained on the same material when tested by Test Method D4953.
1.3 The values stated in SI units are to be regarded as standard. The inch-pound units values given in parentheses after SI units
are provided for information only.only and are not considered standard.
1.4 WARNING—Mercury has been designated by many regulatory agencies as a hazardous materialsubstance that can cause
central nervous system, kidney and liver damage. serious medical issues. Mercury, or its vapor, may has been demonstrated to be
hazardous to health and corrosive to materials. Caution should be taken Use Caution when handling mercury and mercury
containing mercury-containing products. See the applicable product Material Safety Data Sheet (MSDS) for details and EPA’s
website – http://www.epa.gov/mercury/faq.htm - for additional information. Users should be aware (SDS) for additional
information. The potential exists that selling mercury and/or mercury containing products into your state or country may be
prohibited by law. or mercury-containing products, or both, is prohibited by local or national law. Users must determine legality
of sales in their location.
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 safety, health, and healthenvironmental practices and determine the
applicability of regulatory limitations prior to use. For specific safety warning statements, see 7.2 through 7.8.
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