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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Historical Version s – view previous versions of standard. To do so, it is necessary to X3.
It is the responsibility of the user of this standard to establish appropriate safety v3588 health practices and determine the applicability of regulatory limitations prior to use.
The method based upon Eq lLhas been adopted for this practice. DSased upon ideal reaction;] the entry for water represents the iotal enthalpy of vaporization. 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 their heating vall. The corrected mole fractions are:: Aastm is the molar mass of therpixture,i:: The heating values of a gas depend not only upon the temperature and pressure, but also upon the degree of saturation with water vapor.
Any digits carried beyond 1 part in’ lOQO are not significant but only allieviateroundoff error. Significance and Use 5. Calculation procedures for other base conditions are given. Link to Active This link will always route to the current Active version of the standard. It is possible to account for these effects in a general manner.
The SI units given in parentheses are for information only. That critical value depends upon the gas composition, the humidity of the gas, and the amount of excess air. Xj is asgm mole fraction qstm Componentj;Mj is the iliohir mass of Component j from Table 1, and n is the total asym of components.
The,following tyst methods are applicable to this’ pr. For saturated gas kg is tmity.
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Therefore, the complete correction for the effect of water on heating value is: Appendix Xl contains a rigorous examination of,the effect of water. The precision of the method is related to the repeatability and reproducibility of the analysis.
The products and reactants again correspond to Eq X1. A humidity of air exists for each gas above which HV id is greater than that calculated by Eq X2. Precision aastm does not accurately’describe the effect of water upon the heating value.
All three custody transfer properties heating value, compressibility factor, and relative density can be calculated from the composition given pure component property tables. Thus, if the definition is of a hypothetical state, using a hypothetical real gas rather than an ideal gas state adds nothing but complexity.
Originally published as D – Condensation of any “spectator” water does not contribute to the net heating value. Available from Gas Processors Association, E. Any digits carried beyond 1 part in are not significant but only allieviate roundoff error.
It is also an essential factor in calculating the efficiencies of energy cone’ version devices such as gas-fired turbines. It is not possible, at The American Society for Testing and Materials takes no position respecting the validity of any patent rights asserted in connection with any item mentioned in this standard.
Current edition approved May 10,