ASTM D240 PDF

Under normal conditions, this test method is directly applicable to such fuels as gasoline, kerosene, Nos. This test method is not repeatable and not as reproducible as Test Method D The values stated in SI units are to be regarded as standard. The values in parenthesis are for information only. This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

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Scope This test method covers the determination of the heat of combustion of liquid hydrocarbon fuels ranging in volatility from that of light distillates to that of residual fuels. Under normal conditions, this test method is directly applicable to such fuels as gasolines, kerosines, Nos.

This test method is not as repeatable and not as reproducible as Test Method D The values stated in SI units are to be regarded as the standard.

Discussion The fuel can be either liquid or solid, and contain only the elements carbon, hydrogen, nitrogen, and sulfur. The products of combustion, in oxygen, are gaseous carbon dioxide, nitrogen oxides, sulfur dioxide, and liquid water. In this procedure, 25 Deg C is the initial temperature of the fuel and the oxygen, and the final temperature of the products of combustion. Discussion The fuel can be either liquid or solid, and contain only the elements carbon, hydrogen, oxygen, nitrogen, and sulfur.

The products of combustion, in oxygen, are carbon dioxide, nitrogen oxides, sulfur dioxide, and water, all in the gaseous state. In this procedure, the combustion takes place at a constant pressure of 0. Summary of Test Method Heat of combustion is determined in this test method by burning a weighed sample in an oxygen bomb calorimeter under controlled conditions.

The heat of combustion is computed from temperature observations before, during, and after combustion, with proper allowance for thermochemical and heat transfer corrections. Either isothermal or adiabatic calorimeter jackets can be used. Temperatures can be measured in degrees Celsius. Temperature can be recorded in either degrees Fahrenheit or ohms or other units when using electric thermometers. Use the same units in calculations, including standardization.

Time is expressed in calculations in minutes and decimal fractions thereof. It may be measured in minutes and seconds. Masses are measured in grams and no buoyancy corrections are applied. Significance and Use The heat of combustion is a measure of the energy available from a fuel. A knowledge of this value is essential when considering the thermal efficiency of equipment for producing either power or heat.

The heat of combustion is determined by this test method is designated as one of the chemical and physical requirements of both commercial and military turbine fuels and aviation gasoline. The range of such aircraft between refueling is a direct function of the heat of combustion and density of the fuel. Reagents Benzoic Acid, Standard Benzoic Acid powder must be compressed into a tablet or pellet before weighing.

Benzoic Acid pellets for which the heat of combustion has been determined by comparison with the National Bureau of Standards are obtainable commercially for those laboratories not equipped to pellet benzoic acid.

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