ASTM D4529 - 17

    Standard Test Method for Estimation of Net Heat of Combustion of Aviation Fuels

    Active Standard ASTM D4529 | Developed by Subcommittee: D02.05

    Book of Standards Volume: 05.02

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    Significance and Use

    4.1 This test method is intended for use as a guide in cases where an experimental determination of heat of combustion is not available and cannot be made conveniently, and where an estimate is considered satisfactory. It is not intended as a substitute for experimental measurements of heat of combustion (Note 2).

    Note 2: The procedures for the experimental determination of the gross and net heats of combustion are described in Test Methods D240 and D4809.

    4.2 The net heat of combustion is a factor in the performance of all aviation fuels. Because the exhaust of aircraft engines contains uncondensed water vapors, the energy released by fuel in vaporizing water cannot be recovered and must be subtracted from gross heat of combustion determinations to calculate net heat of combustion. For high performance weight-limited aircraft, the net heat of combustion per unit mass and the mass of fuel loaded determine the total safe range. The proper operation of the aircraft engine also requires a certain minimum net energy of combustion per unit volume of fuel delivered.

    4.3 Because the heat of combustion of hydrocarbon fuel-mixtures are slowly varying functions of the physical properties of the mixtures, the heat of combustion of the mixtures can often be estimated with adequate accuracy from simple field tests of density and aniline point temperature, without the elaborate apparatus needed for calorimetry.

    4.4 The empirical quadratic equation for the net heat of combustion of a sulfur-free fuel was derived by the method of least squares from accurate measurements on fuels, most of which conformed to specifications for fuels found in Note 1 and were chosen to cover a range of values of properties. Those fuels not meeting specifications were chosen to extend the range of densities and aniline-point temperatures above and below the specification limits to avoid end effects. The sulfur correction was found by a simultaneous least-squares regression analysis of sulfur-containing fuels among those tested.

    1. Scope

    1.1 This test method covers the estimation of the net heat of combustion at constant pressure in metric (SI) units, megajoules per kilogram.

    1.2 This test method is purely empirical, and it is applicable only to liquid hydrocarbon fuels derived by normal refining processes from conventional crude oil which conform to the requirements of specifications for aviation gasolines or aircraft turbine and jet engine fuels of limited boiling ranges and compositions as described in Note 1.

    Note 1: The estimation of the net heat of combustion of a hydrocarbon fuel from its aniline point temperature and density is justifiable only when the fuel belongs to a well-defined class for which a relationship between these quantities has been derived from accurate experimental measurements on representative samples of that class. Even in this class, the possibility that the estimates can be in error by large amounts for individual fuels should be recognized. The JP-8 fuel, although not experimentally tested, has properties similar to JP-5 and Jet A fuels and can be considered in the same class. The classes of fuels used to establish the correlation presented in this test method are represented by the following applications:





    Aviation gasoline fuels:

    Specification D910

    Grades 80, UL82, UL87, 90, 91, UL91, 94, UL94, 100/100LL/100VLL

    Specification D6227
    Specification D7547
    Specification D7592

    Aviation turbine fuels:

    Specification D6615

    Jet B, JP-4








    Jet A, Jet A-1

    Specification D1655
    Specification D7223
    Specification D7566

    1.3 The net heat of combustion can also be estimated by Test Methods D1405 or D3338. Test Method D1405 requires calculation of one of four equations dependent on the fuel type with the precision equivalent to that of this test method, whereas Test Method D3338 requires calculation of a single equation for aviation fuel with a precision equivalent to that test method.

    1.4 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.

    1.5 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.

    2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.

    ASTM Standards

    D129 Test Method for Sulfur in Petroleum Products (General High Pressure Decomposition Device Method)

    D240 Test Method for Heat of Combustion of Liquid Hydrocarbon Fuels by Bomb Calorimeter

    D611 Test Methods for Aniline Point and Mixed Aniline Point of Petroleum Products and Hydrocarbon Solvents

    D910 Specification for Aviation Gasolines

    D941 Test Method for Density and Relative Density (Specific Gravity) of Liquids by Lipkin Bicapillary Pycnometer

    D1217 Test Method for Density and Relative Density (Specific Gravity) of Liquids by Bingham Pycnometer

    D1250 Guide for Use of the Petroleum Measurement Tables

    D1266 Test Method for Sulfur in Petroleum Products (Lamp Method)

    D1298 Test Method for Density, Relative Density (Specific Gravity), or API Gravity of Crude Petroleum and Liquid Petroleum Products by Hydrometer Method

    D1405 Test Method for Estimation of Net Heat of Combustion of Aviation Fuels

    D1655 Specification for Aviation Turbine Fuels

    D2622 Test Method for Sulfur in Petroleum Products by Wavelength Dispersive X-ray Fluorescence Spectrometry

    D3120 Test Method for Trace Quantities of Sulfur in Light Liquid Petroleum Hydrocarbons by Oxidative Microcoulometry

    D4052 Test Method for Density, Relative Density, and API Gravity of Liquids by Digital Density Meter

    D4294 Test Method for Sulfur in Petroleum and Petroleum Products by Energy Dispersive X-ray Fluorescence Spectrometry

    D4809 Test Method for Heat of Combustion of Liquid Hydrocarbon Fuels by Bomb Calorimeter (Precision Method)

    D5453 Test Method for Determination of Total Sulfur in Light Hydrocarbons, Spark Ignition Engine Fuel, Diesel Engine Fuel, and Engine Oil by Ultraviolet Fluorescence

    D6227 Specification for Unleaded Aviation Gasoline Containing a Non-hydrocarbon Component

    ICS Code

    ICS Number Code 75.160.20 (Liquid fuels)

    Referencing This Standard
    Link Here
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    DOI: 10.1520/D4529-17

    Citation Format

    ASTM D4529-17, Standard Test Method for Estimation of Net Heat of Combustion of Aviation Fuels, ASTM International, West Conshohocken, PA, 2017,

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