1 Apr ASTM D(). Standard Practice for Calculating Heat Value, Compressibility Factor, and Relative Density of Gaseous Fuels. standard. 4, Mole Fractions from ASTM D @ 60°F & 1 atm, ASTM D 5, Natural Gas, Chemical, Mole, Specific, Net Heat Val, ASTM D 6, Constituents. 1 Apr Purchase your copy of ASTM D – 98() as a PDF download or hard copy directly from the official BSI Shop. All BSI British Standards.

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Therefore, the heating value is used as a parameter for determining the price of gas in custody transfer. Table 1, ideal gas values.

For use as heating agents, the relative astm d3588 of gases from different sources and having different compositions can aztm compared readily on the basis of their heating values.

It is applicable to all common types of utility gaseous fuels for example, dry natural gas, reformed gases, oil gas both high- and low-Btupropane-air, carbureted water astm d3588, and coke oven and retort coal gas for which suitable methods of analysis as described astm d3588 Section 6 are available.

This standard is subject to revision at any time by the responsible technical committee and must be reviewed every five years and if not revised, either reapproved or withdfawn.

Tables are provided for gaseous and liquid propane at temperatures between 85 and K at Any digits carried beyond 1 part in astm d3588 not significant but only allieviate roundoff error.

The values for the pure gases astm d3588 in GPA Standardwhich is revised annually. Eq16 is’adequate for custody transfer applications as ‘a matter ofdefini.

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The rate of energy released upon combustion’is the product of the astm d3588 value of the gas and the flow rate of the gas. Calculation procedures for other base conditions are given. E3588 practice is intended for use in ast, the sample size required to estimate, with specified precision, a measure of quality of a lot or process. Astm d3588, combining Eq 19 and Eq 20 gives: If the net heating value has a volumetric astm d3588 than a mass or molar basis, base pressure must also be specified.


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The heating value is, therefore,’ astm d3588 ideal gas property that can astm d3588 calculated unambiguously from tables of pure component values and it has no pressure dependence. Some routine astm d3588 do not detelmine compounds such as I-Ie and H astm d3588 S, but these compounds are important to the calculations. That critical value depends upon the gas composition, the humidity of the gas, and the amount of excess air.

Users of this standard are expressly advised that determination of the validity of any such patent rights, and the risk of infringement of such rights, are entirely their own responsibility.

The ideal gross heating value results when all the water fonned by the reaction condenses to liquid: For saturated gas kg is tmity. Ma is the molar mass of air. Eq 9 can be used astm d3588 Eq 10 for calculation of the compressibility factor for the various pressure bases, but it is not accurate at pressures greater than two atmospheres. Any digits carried beyond 1 part in’ lOQO are not significant but only allieviateroundoff error.

Hs ,CS H1O Significance and Use 5. The heating values of a gas depend not only upon the temperature and pressure, but also upon the degree of saturation with water vapor. It is customary in the gas industry to use gross heating value for most astm d3588, So for the remainder of this appendix, the term “heating value;’ refers to the gross value.


SITE To ensure the functioning of the site, we use cookies. If only the water that is fanned during the combustion condenses; then the heat astm d3588 upon combustion of a wetgaswith’dry air becomes: If we astm d3588 that the water formed in the reaction remains in the ideal gas state, the heating value is termed “net.

The uncertainty’ twice the standard deviation of the ideal gas heating values for components should be 0. The SI units given in parentheses are for information only.

All three custody transfer properties heating value, compressibility factor, and relative density can be calculated from the composition given pure component property tables. It is obvious that all of the reaction water actually cannot condense because in a situation in which both gas and air are dry some astm d3588 the reaction water saturates the product gases and the astm d3588 condenses.

We share information about your activities on the site with our partners and Google partners: The mole fraction of water in the gas results from the definition of relative humidity: However, astm d3588 calorimetric methods for measuring astm d3588 values are based upon the gas being saturated with water at the specified conditions. Calculation procedures for other base conditions are given.

Forwater7satnratedgas, Xw at 60 o P