1、ASTM D519 71=0759510 0500864.5 9(Th Designation:D 5189-91 AMERICAN SOCIETY M R TESTING AND MATERIALS 1916 RaceSt.Philadelphia,Pa 19103 Reprinted from the Annual Book of ASTh4 Standards.Copyright ASTM If not listed in the current combined Index,will appear in the next edition.Standard Test Method for
2、 Temperature Corresponding to Vapor-Liquid Ratio of 20 for Gasoline and Gasoline-Oxygenate Blends(Bomb Method)This standard is issued under the fixed designation D 5 189;the number immediately following the designation indicates the year of original adoption or,in the case of revision,the year of la
3、st revision.A number in parentheses indicates the year of last reapproval.A superscript epsilon(e)indicates an editorial change since the last revision or reapproval.1.Scope 1.1 This test method(see Note 1)covers a procedure to determine the temperature at which the vapor formed from a gasoline or a
4、 gasoline-oxygenate blend,saturated with air at O to 1C(32 to 34”F),produces a calculated partial pressure equal to IO 1.3 kPa(1 atm).This test method is performed with a metal fuel chamber,originally filled with the chilled liquid fuel,connected to a vapor chamber 20.0 times the volume of the liqui
5、d chamber.This temperature is consid-ered to be comparable to the temperature at which the vapor-liquid ratio of the fuel(see Note 2)is equal to 20 as determined by Test Method D 2533.This test method is not applicable to samples having a vapor pressure above 180 kPa(26 psi)as determined by Test Met
6、hod D 323 or by Test Method D 4953.NOTE I-This test method is also known as the“Bomb V/L Test Method.”KOTE 2-Test Method D 2533 is applicable to gasoline-oxygenate blends only when mercury is used as the confining medium.Subcom-mittee D02.08 is currently evaluating the suitability of D2533 using gly
7、cerol as the confining medium for certain gasoline-oxygenate blends.I.2 The actual vapor-liquid ratio under these conditions is not exactly 20.0 since no corrections are made for the expansion of the liquid sample with increasing temperature,the decrease in liquid sample volume because of partial va
8、porization,the dissolved air in the liquid sample,and the effect of the air originally present in the vapor chamber.1.3 In this test method the partial pressure of the fuel is observed as a gage pressure in the presence of air.In Test Method D 2533 the vapor pressure of the fuel is measured as an ab
9、solute pressure.Strict correspondence between the temperature at which the vapor-liquid ratio is 20,as deter-mined by these two test methods,is hence only valid for ideal mixtures.For practical purposes results by these two test methods can be expected to be comparable.1.4 The values stated in SI un
10、its are to be regarded as the standard.The values given in parentheses are provided for information purposes only.1.5 This standard does not purport to address all of the safety problems,i f any,associated with its use.It is the responsibility o f the user o f this standard to establish appro-priate
11、 safety and health practices and determine the applica-bility o f regulatory limitations prior to use.Specific precau-tionary statements are given in Section 7,Hazards,and Notes 9,10,and 14.2.Referenced Documents 2.1 ASTM Standards:D323 Test Method for Vapor Pressure of Petroleum D 2533 Test Method
12、for Vapor-Liquid Ratio of Spark-D4057 Practice for Manual Sampling of Petroleum and D4953 Test Method for Vapor Pressure of Gasoline and Products(Reid Method)2 Ignition Engine Fuels3 Petroleum Products4 Gasoline-Oxygenate Blends(Dry Methd)3.Terminology 3.1 Description o f Terms Specific to This Stan
13、dard:3.1.1 Tcv,L=20),n-the equilibrium temperature at which the partial pressure of a fuel,under the test conditions,is equal to 101.3 kPa(1 atm).At these conditions the volume of the vapor is equal to 20 times the volume of the liquid sample charged at O to 1C(32 to 34F).3.1.2 uncorrected vapor pre
14、ssure,n-the observed experi-mental pressure at that particular temperature.3.1.3 vapor-liquid(V/L)ratio,n-the value calculated by Eq.1 or 2 in Section 11 of this test method,4.Summary of Test Method 4.1 The liquid chamber of the VIL apparatus,having a volume of approximately 25 mL,is filled with the
15、 chilled fuel at O to 1C(32 to 34F)and connected to the vapor chamber,having a volume 20 times the volume of the liquid chamber.The apparatus is immersed in a constant tempera-ture bath set in the approximate temperature range of interest.A portion of the liquid will vaporize and a positive pressure
16、 will be observed.The assembly is shaken periodi-cally until a constant pressure is observed on the pressure readout device attached to the apparatus,After recording this pressure and the corresponding temperature,the apparatus is moved to another constant temperature bath set at a temperature 5 to 15C(9 to 27F)higher than the previous bath.The apparatus is shaken periodically until a constant pressure is observed.This pressure and the corresponding temperature are again recorded.4.2 Using the e
