API TR 2575-2014 pdf download

API TR 2575-2014 pdf download

API TR 2575-2014 pdf download.Measurement of Thermally Cracked Gas.
1 Scope This technical report presents a method to compute the density, compressibility factor, and supercompressibility factor for thermally cracked gas (TCG) for custody transfer using orifice meters. It provides equations, parameters, computation flow diagrams, and example spreadsheet calculations. This technical report applies to TCG mixtures after treatment. See Table 2 for more information on the types of gases covered. It applies for temperature from 90 °F to 120 °F (305 K to 322 K) at pressures up to 300 psig (2 MPa). It is limited to a specific operating region. The method is for the single gas phase only. 2 Normative References The following referenced documents are indispensable for the application of this document or provide additional information pertinent to mass measurement of natural gas liquids. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. API Manual of Petroleum Measurement Standards (MPMS), Chapter 14.2, Compressibility Factors of Natural Gas and Other Related Hydrocarbon Gases (AGA Report No. 8 1 ) (GPA 8185 2 ) 3 Terms, Definitions, Abbreviations, and Symbols 3.1 Terms and Definitions The quantities used in the equations in this document are defined when they are used.
3.3 Units and Conversions The units used in the basic formulation of the equations and in the associated computer subroutines are SI units. The subroutines use the following units for the absolute temperature in kelvins (K), pressure in megapascals (MPa), and molar density in moles per cubic decimeter (mol/dm 3 ). The value of the gas constant is 0.008314472 KJ/mol-K. Conversion factors are required for conversions to and from other units. Consistent conversion factors for use with the TCG method are given in Table 1. When possible, the conversion factors given in Table 1 correspond to international standards (GPA 2172-2009 and ISO 6976). Any differences in values used in this program and later values are within the experimental uncertainty in the validation data. Hence any unit conversion changes are unlikely to affect the uncertainty of the calculations. It is recommended that any subsequent changes be ignored unless the agency promoting the change provides a detailed cost impact of the change on industry. 4 Types of Gases Covered This research document applies to TCG mixtures that may occur in refinery operations. Table 2 provides a simplified list of illustrative TCG mixture example components. A number of components have been excluded either because they were not present in the data or because of low concentration amounts. This shall not be construed to mean those components are not important for TCG calculations. It simply means those components were not available to the research stage data sets. It is recommended that users obtain additional data to validate performance for their fluid mixtures for their operating conditions.
Application and operation conditions should be verified by obtaining experimental data for other conditions. The calculation method should not be used outside of the specified boundaries without supporting experimental data, nor should it be used in the vicinity of the critical point. It cannot be used for two-phase calculations. It is recommended that methods be considered with broader applicability (e.g. API MPMS Ch. 14.2 or GERG 2008 methods) be applied to extended operating conditions until API completes its TCG mixture data work. NOTE API MPMS Ch. 14.2 and GERG 2008 methods were not explicitly developed for TCG mixtures. These methods have unknown uncertainties for TCG mixtures at the time this technical report was produced. In Section 1.3.2 of API MPMS Ch. 14.2/AGA Report No. 8/GPA 8185, no reference is made to the application of the equations to TCG mixtures. This section indicates that the performance for calculations for gas mixtures that do not fall in the normal range of gas mixtures should be verified by other means (i.e. measured data representing commercial TCG mixtures). Figure 1 provides an overview of the custody transfer measurement and operating pressure and temperature region for TCGs. 6 TCG Calculation Method Overview 6.1 Overview of Requirements The user of this report has to be aware of the custody transfer operating conditions and the applicability of the method over those conditions.

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