Document Name: ASTM D Standard Practice for Calculating Heat CFR Section(s): Standards Body: Value, Compressibility Factor, and Relative Density. 1 Apr ASTM D(). Standard Practice for Calculating Heat Value, Compressibility Factor, and Relative Density of Gaseous Fuels. standard. 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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The ideal net heating value results when all the water remains in the ideal gas state. This standard is subject to revision at any time by the responsible technical committee and must be reviewed every five xstm and if not revised, either reapproved or withdfawn. Your consent to our cookies if you continue to use this website.

If only the water that is s3588 during the combustion condenses; then the heat released upon combustion of a wetgaswith’dry air becomes: A humidity of air exists for each gas above which HV id is greater than that calculated by Eq X2. Precision equation does not accurately’describe the effect of water upon the heating value. It is necessary to correct the sensible heat effects to arrive at a different temperature: For use as heating agents, the relative merits of gases from different sources and having different compositions can be compared readily on the basis of d358 heating values.

Any digits carried beyond 1 part in’ lOQO are not significant but only allieviateroundoff error. Hv is slightly different from HV id because the base pressure is d35888 the likelihood of having all the information required to use Eq X3. The rate of energy released upon combustion’is the product of the heating value of the gas and the flow rate of the gas.

If the net heating value has a volumetric rather than a mass or molar qstm, base pressure must also be specified. It is possible to account for these effects in a general manner. Significance and Use 5. For an ideal gas, the mass flow rate is related to the volumetric flow rate, yidd35588 The SI units given in parentheses are for information only. Appendix Xl contains a rigorous examination of,the effect of water.

Hs ,CS H1O Calculation procedures for other base conditions are given. Special treatmeI “t is not required for H2 and He at mole fractions up to 0.

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Your comments will receive careful consideration at a meeting of the responsible technical committee, which you may attend. Condensation of any “spectator” water does not contribute to the net heating value.

Any digits carried beyond 1 part in are not significant but only allieviate roundoff error.

Xj is the mole fraction of Componentj;Mj is the iliohir mass of Component j from Table 1, and n is the total number of components. The ideal relative density is the molar mass ratio. The ideal gross heating value results when all the water fonned by the reaction condenses to liquid: The values for the pure gases appear in GPA Standardwhich is revised annually.

Your comments are invited either for revision of this standard or for additional standards and should be addressed to ASTM Headquarters. NOTE 3-It is essential to include all components in the gas sample that appear with mole fractions greater than or equal to 0. The products and reactants again correspond to Eq X1. If we assume that the water adtm in the reaction remains in the ideal gas state, the heating value is termed “net.

The precision of the method is related to the repeatability and reproducibility of the analysis. The temperature dependence of b must be defined, but in the custody transfer region it is easy to do so.

The SI units given in parentheses are for information only. d35588

## ASTM D3588 – 98(2017)

The heating value is, therefore,’ an ideal gas property that can be calculated unambiguously from tables of pure component ast and it has no pressure dependence. Asm is the responsibility of the user of this standard to establish appropriate safety and health practices and determine d35588 applicability of regulatory limitations prior to use.

The corrected mole fractions are:: Dd3588, combining Eq 19 and Eq 20 gives: That critical value depends upon the gas composition, the humidity of the gas, and the amount of excess air. D – 98 Standard Practice for Calculating Heat Value, Compressibility Factor, and Relative Density of Gaseous Fuels 1 This standard is issued under the fixed designation D ; the nwnber immediately following the designation indicates the year of original adoption or, in the case of revision, the year of last revision.

For saturated gas kg is tmity. Conversions to other base conditions should be made at the end of the calculation to reduce roundoff errors. Therefore, the complete correction for the effect of water on heating value is: Ma is the molar mass of air. Current edition approved May 10, Ising the real gas flow rate rather than the,ideal gas flow rate. Eq 9 can be used with Eq 10 for calculation of the compressibility factor for the various pressure bases, but it is not accurate at pressures greater than two atmospheres.

It is not possible, at The American Society for Testing and Materials takes no position respecting the validity of any patent rights asserted d388 connection with any item mentioned in this standard.

Table 1, ideal gas values. 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. Available from Gas Processors Association, E. All three custody transfer properties heating value, compressibility factor, and relative density can be calculated from the composition given pure component property tables.

However, some calorimetric methods for measuring heating values are based upon the gas being saturated with water at the specified conditions.

Some routine analyses do not detelmine r3588 such as I-Ie and H 2 S, but these compounds are important to the calculations. An example appears in Table 3. Eq16 is’adequate for custody transfer applications as ‘a matter ofdefini.

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