ASTM-D7739 Standard Practice for Thermal Oxidative Stability Measurement via Quartz Crystal Microbalance

ASTM-D7739 - 2011 R16 EDITION - CURRENT
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Standard Practice for Thermal Oxidative Stability Measurement via Quartz Crystal Microbalance
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Scope

1.1 This laboratory practice covers the quantitative determination of surface deposits produced during the thermal oxidation of gas turbine fuels by monitoring the oscillation frequency of a quartz crystal during thermal exposure. In this practice, “thermal oxidative stability” refers to the tendency of a fuel to resist surface deposit formation during heating.

1.2 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.

1.3 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.

Significance and Use

3.1 The tendency of a jet fuel to resist the formation of deposits at elevated temperature is indicative of its oxidative thermal stability. This practice provides a technique for the simultaneous determination of deposit formation and oxygen consumption during the thermal oxidation of jet fuels and other hydrocarbon liquids. The practice can be used to evaluate the thermal stability of fuels and to determine the efficacy of additives in inhibiting deposition or slowing oxidation, or both. A test temperature of 140 °C and run length up to 16 h has been found to be effective for the relative evaluation of fuels and fuel additives. This practice has also been employed for other hydrocarbon liquids, such as gasoline and diesel fuels, but additional safety issues may need to be addressed by the user.

Keywords

gas turbine fuels; quartz crystal microbalance; thermal oxidative stability;; ICS Number Code 75.160.20 (Liquid fuels)

To find similar documents by ASTM Volume:

05.04 (Petroleum Products and Lubricants (IV): D6973 - latest)

To find similar documents by classification:

75.160.20 (Liquid fuels Including gasoline, diesel, kerosene, etc.)

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Document Number

ASTM-D7739-11(2016)

Revision Level

2011 R16 EDITION

Status

Current

Modification Type

Reapproval

Publication Date

May 15, 2016

Document Type

Practice

Page Count

6 pages

Committee Number

D02.J0.03