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Standard Test Method for Vapor Pressure of Gasoline and Gasoline-Oxygenate Blends (Dry Method)
Automaticky preložený názov:
Štandardná skúšobná metóda pre tlak pár benzínu a benzínu - Oxygenate Zmesi ( Dry Method )
NORMA vydaná dňa 1.6.2015
Označenie normy: ASTM D4953-15
Poznámka: NEPLATNÁ
Dátum vydania normy: 1.6.2015
Kód tovaru: NS-591353
Počet strán: 8
Približná hmotnosť: 24 g (0.05 libier)
Krajina: Americká technická norma
Kategória: Technické normy ASTM
Keywords:
ICS Number Code 75.160.20 (Liquid fuels)
Significance and Use | ||||||||||||
5.1 Vapor pressure is an important physical property of liquid spark-ignition engine fuels. It provides an indication of how a fuel will perform under different operating conditions. For example, vapor pressure is a factor in determining whether a fuel will cause vapor lock at high ambient temperature or at high altitude, or will provide easy starting at low ambient temperature. 5.2 Petroleum product specifications generally include vapor pressure limits to ensure products of suitable volatility performance. Note 3: Vapor pressure of fuels is regulated by various
government agencies.
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1. Scope | ||||||||||||
1.1 This test method covers and is applicable to gasolines and gasoline-oxygenate blends with a vapor pressure range from 35 kPa to 100 kPa (5 psi to 15 psi) (see Note 2). This test method, a modification of Test Method D323 (Reid Method), provides two procedures to determine the vapor pressure (Note 1) of gasoline and gasoline-oxygenate blends. Note 1: Because the external atmospheric pressure is
counteracted by the atmospheric pressure initially present in the
air chamber, this vapor pressure is an absolute pressure at 37.8 °C
(100 °F) in kilopascals (pounds-force per square inch). This vapor
pressure differs from the true vapor pressure of the sample due to
some small vaporization of the sample and air in the confined
space.
Note 2: Vapor pressure of gasoline or gasoline-oxygenate
blends below 35 kPa (5 psi) or greater than 100 kPa (15 psi) can be
determined with this test method but the precision and bias
(Section 11) do not apply.
For materials with a vapor pressure greater than 100 kPa (15 psi),
use a 0 kPa to 200 kPa (0 psi to 30 psi) gauge as specified in the
annex of Test Method D323.
1.2 Some gasoline-oxygenate blends may show a haze when cooled to 0 °C to 1 °C. If a haze is observed in 9.4, it shall be indicated in the reporting of results. The precision and bias statements for hazy samples have not been determined (see Note 7). 1.3 The values stated in SI units are to be regarded as standard. The values given in parentheses are for information only. 1.4 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. Specific warnings are given in 7.5, 8.4.1, 8.5.1, 9.1, A1.1, and A1.1.3. |
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2. Referenced Documents | ||||||||||||
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