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ASTM D 3338 Document Information:
Title
Standard Test Method for Estimation of Net Heat of Combustion of Aviation Fuels
ASTM International
Publication Date:
May 1, 2008
Scope:
This test method covers the estimation of the net heat of
combustion (megajoules per kilogram or Btu per pound) of aviation
gasolines and aircraft turbine and jet engine fuels.
This test method is purely empirical and is applicable to liquid
hydrocarbon fuels that conform to the specifications for aviation
gasolines or aircraft turbine and jet engine fuels of grades Jet A,
Jet A-1, Jet B, JP-4, JP-5, JP-7, and JP-8.
NOTE 1—The experimental data on heat of combustion from which
the Test Method D 3338 correlation was devised was obtained by a
precision method similar to Test Method D 4809.
NOTE 2—The estimation of the net heat of combustion of a
hydrocarbon fuel is justifiable only when the fuel belongs to a
well-defined class for which a relation between heat of combustion
and aromatic and sulfur contents, density, and distillation range
of the fuel has been derived from accurate experimental
measurements on representative samples of that class. Even in this
case, the possibility that the estimates may be in error by large
amounts for individual fuels should be recognized.The fuels used to
establish the correlation presented in this method are defined as
follows:
Fuels:
Aviation gasoline—Grades 100/130 and 115/145 (1,
2)2
Kerosines, alkylates, and special WADC fuels (3)
Pure hydrocarbons—paraffins, naphthenes, and aromatics (4)
Fuels for which data were reported by the Coordinating
Research
Council (5).
The values stated in SI units are to be regarded as standard. No
other units of measurement are included in this standard.
Although the test method permits the calculation of net heat of
combustion in either SI or inch-pound units, SI units are the
preferred units.
The net heat of combustion can also be estimated in inch-pound
units by Test Method D 1405 or in SI units by Test Method D 4529.
Test Method D 1405 requires calculation of one of four equations
dependent on the fuel type with a precision equivalent to that of
this test method. Test Method D 4529 requires calculation of a
single equation for all aviation fuels with a precision equivalent
to that of this test method. Unlike Test Method D 1405 and D 4529,
Test Method D 3338 does not require the use of aniline point.
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.
*A Summary of Changes section appears at the end of this
standard.
2 The boldface numbers in parentheses refer to a list
of references at the end of this standard.
Keywords:
- aviation fuel
- gross heat of combustion
- heat energy
- heat of combustion
- heating tests
- net heat of combustion
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