ASTM-D5191:2007 Edition

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D5191-07 Standard Test Method for Vapor Pressure of Petroleum Products (Mini Method)

Published By	Publication Date	Number of Pages
ASTM	2007	9

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Category: ASTM

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Description

ASTM D5191-07

Historical Standard: Standard Test Method for Vapor Pressure of Petroleum Products (Mini Method)

ASTM D5191

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. This test method is suitable for testing samples with boiling points above 0°C (32°F) that exert a vapor pressure between 7 and 130 kPa (1.0 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 to 10 mL. No account is made for dissolved water in the sample.

Note 1 – Samples can also be tested at other vapor-to-liquid ratios, temperatures, and pressures, but the precision and bias statements need not apply.

Note 2 – The interlaboratory studies conducted in 1988, 1991, and 2003 to determine the precision statements in Test Method D 5191 did not include any crude oil in the sample sets. Test Method D 6377, 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 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 14).

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 Eqn. 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 D 4953.

1.3 The values stated in SI units are regarded as standard. The inch-pound units given in parentheses are provided for information only.

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 and health practices and determine the applicability of regulatory limitations prior to use. For specific safety warning statements, see 7.2 through 7.8.

Keywords

dry vapor pressure; gasoline; hydrocarbon-oxygenate blends; mini method; petroleum products; vapor pressure

ICS Code

ICS Number Code 75.080 (Petroleum products in general)

DOI: 10.1520/D5191-07

PDF Catalog

PDF Pages	PDF Title
1	Scope Referenced Documents Terminology
2	Summary of Test Method Significance and Use Apparatus Reagents and Materials
3	Sampling TABLE 1
4	FIG. 1
5	Preparation of Apparatus Calibration FIG. 2
6	Verification of Instrument Performance Quality Control Checks Procedure Calculation
7	Report Precision and Bias Keywords TABLE 2 TABLE 3
8	X1.1 Samples X1.2 Reference Fuels X1.3 D5191 Instrument Types and Data Sets Evaluated TABLE 4
9	X2. GUIDELINES AND SUGGESTIONS FOR PREPARING, STORING, AND ISOLATING QC SAMPLES FOR USE IN THIS TEST X2.1 X2.2