ASTM D5304 Standard Test Method for Assessing Middle Distillate Fuel Storage Stability by Oxygen Overpressure
1. Scope
1.1 This test method covers a procedure for assessing the potential storage stability of middle distillate fuels such as Grade No. 1D and Grade No. 2D diesel fuels, in accordance with Specification D975.
1.2 This test method is applicable to either freshly refined fuels or fuels already in storage.
1.3 This test method is suitable for fuels containing stabilizer additives as well as fuels containing no such additives. However, fuels additized with dispersant additives, including dispersant-containing stability additives, may be ranked inaccurately using this test method compared to fuels that are not additized with dispersant additives.
1.4 Appendix X1 provides information on other suggested test times and temperatures for which this test method may be used.
1.5 The values stated in SI units are to be regarded as standard. The values given in parentheses are for information only.
1.6 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 warning statements, see 4.1, 6.2, 6.3, and 7.4.
2. Referenced Documents
2.1 ASTM Standards:
D525 Test Method for Oxidation Stability of Gasoline (Induction Period Method)
D975 Specification for Diesel Fuel Oils
D4057 Practice for Manual Sampling of Petroleum and Petroleum Products
D4177 Practice for Automatic Sampling of Petroleum and Petroleum Products
D4306 Practice for Aviation Fuel Sample Containers for Tests Affected by Trace Contamination
E1 Specification for ASTM Liquid-in-Glass Thermometers
3. Terminology
3.1 Definitions:
3.1.1 membrane filter, n - a porous article of closely controlled pore size through which a liquid is passed to separate matter in suspension.
3.2 Definitions ofTerms Specific to This Standard:
3.2.1 oxygen overpressure, n - partial pressures of oxygen higher than that of air at atmospheric pressure.
3.2.2 potential storage stability, n - the tendency of a fuel to form insolubles under the conditions of this test method.
3.2.3 reactor, n - any vessel capable of sustaining pressures and temperatures above ambient, sometimes designated pressure vessel.
3.2.4 weighing assembly, n - a set of two filters and two aluminum weighing dishes used to determine total insolubles for each sample or blank.
