GB/T 27894.2-2020 English PDFUS$344.00 · In stock
Delivery: <= 3 days. True-PDF full-copy in English will be manually translated and delivered via email. GB/T 27894.2-2020: Natural gas - Determination of composition and associated uncertainty by gas chromatography - Part 2: Uncertainty calculations Status: Valid GB/T 27894.2: Historical versions
Basic dataStandard ID: GB/T 27894.2-2020 (GB/T27894.2-2020)Description (Translated English): Natural gas - Determination of composition and associated uncertainty by gas chromatography - Part 2: Uncertainty calculations Sector / Industry: National Standard (Recommended) Classification of Chinese Standard: E24 Classification of International Standard: 75.060 Word Count Estimation: 18,128 Date of Issue: 2020-09-29 Date of Implementation: 2021-04-01 Older Standard (superseded by this standard): GB/T 27894.2-2011 Regulation (derived from): National Standard Announcement No. 20 of 2020 Issuing agency(ies): State Administration for Market Regulation, China National Standardization Administration GB/T 27894.2-2020: Natural gas - Determination of composition and associated uncertainty by gas chromatography - Part 2: Uncertainty calculations---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order. Natural gas - Determination of composition and associated uncertainty by gas chromatography - Part 2.Uncertainty calculations ICS 75.060 E24 National Standards of People's Republic of China Replace GB/T 27894.2-2011 Determination of composition and calculation of natural gas by gas chromatography Related uncertainty Part 2.Uncertainty calculation (ISO 6974-2.2012, IDT) 2020-09-29 released Implementation on 2021-04-01 State Administration for Market Regulation Issued by the National Standardization Management Committee Table of contentsForeword Ⅰ Introduction Ⅲ 1 Scope 1 2 Normative references 1 3 Terms and definitions 1 4 Symbol 1 5 Uncertainty calculation 2 Appendix A (informative appendix) Uncertainty calculation of the composition of methane treated by subtraction method 10 Appendix B (Normative Appendix) Uncertainty of Relative Response Factor 11 Appendix C (informative appendix) Uncertainty calculation method of unknown quantity 12 Reference 13ForewordGB/T 27894 is divided into the following 6 parts. ---GB/T 27894.1 Gas Chromatography Determination of Composition and Calculation of Related Uncertainties Part 1.General Guidelines and Composition calculation; ---GB/T 27894.2 Gas chromatographic determination of natural gas composition and calculation of related uncertainties. Part 2.Uncertainty Calculation; ---GB/T 27894.3 Determination of the composition of natural gas by gas chromatography under a certain degree of uncertainty Part 3.Filling with two The column measures hydrogen, helium, oxygen, nitrogen, carbon dioxide and hydrocarbons up to C8; ---GB/T 27894.4 Determination of composition of natural gas by gas chromatography under a certain degree of uncertainty Part 4.Laboratory and in Two chromatographic columns are used in the line measurement system to determine nitrogen, carbon dioxide and hydrocarbons from C1 to C5 and C6; ---GB/T 27894.5 Determination of the composition of natural gas by gas chromatography under a certain degree of uncertainty Part 5.Laboratory and in Three chromatographic columns are used in the in-line process system to determine nitrogen, carbon dioxide and C1 to C5 and C6 hydrocarbons; ---GB/T 27894.6 Determination of composition of natural gas by gas chromatography under a certain degree of uncertainty. Part 6.Use three capillaries The column measures hydrogen, helium, oxygen, nitrogen, carbon dioxide and C1 to C8 hydrocarbons. This part is Part 2 of GB/T 27894. This section was drafted in accordance with the rules given in GB/T 1.1-2009. This part replaces GB/T 27894.2-2011 "Determination of composition of natural gas by gas chromatography under certain uncertainty, Part 2 Minutes. Characteristics of Measurement Systems and Mathematical Statistics. Compared with GB/T 27894.2-2011, the main technical changes in this part are as follows. ---Modified the scope and deleted the processing of measurement system analysis data (see Chapter 1, Chapter 1 of the.2011 edition); ---Added terms and definitions (see Chapter 3, Chapter 3 of the.2011 edition); ---Deleted the calculation test program, added the calculation of uncertainty (see Chapter 5, Chapter 5 of the.2011 edition); ---The critical value t is deleted, and the uncertainty calculation of the component after the methane subtraction method is added (see Appendix A,.2011 edition Appendix A); ---The relative response factor data has been deleted, and the uncertainty calculation method of the unknown quantity has been added (see Appendix C, Appendix of the.2011 edition C); ---Modified the informative appendix to the normative appendix, deleted the example, and increased the uncertainty of the relative response factor (see Appendix B, Appendix B of the.2011 edition). The translation method used in this part is equivalent to ISO 6974-2.2012 "Natural Gas Chromatography Determination of Composition and Calculation Related Uncertainties Degree Part 2.Uncertainty Calculation". Chinese documents that have a consistent correspondence with the international documents cited in this section as follows. ---GB/T 27894.1-2020 Gas Chromatography Determination of Composition and Calculation of Uncertainty Related to Natural Gas Part 1.Total Guidelines and composition calculation (ISO 6974-1.2012, IDT); ---GB/T 27418-2017 Measurement Uncertainty Evaluation and Expression (ISO /IEC Guide 98-3.2008, MOD). This section has made the following editorial changes. --- Amend "ISO 6974-3" in the reference to "ISO 6974-3.2000"; --- Amend the "ISO 6974-5" in the reference to "ISO 6974-5.2000". This part was proposed and managed by the National Natural Gas Standardization Technical Committee (SAC/TC244). Drafting organizations of this section. China National Petroleum Corporation Southwest Oil and Gas Field Branch Natural Gas Research Institute, Daqing Oilfield Co., Ltd. Ren company, China Petroleum & Chemical Corporation Natural Gas Branch Metrology Research Center, China National Petroleum Corporation Natural Gas Sales branch, China Institute of Metrology, China National Petroleum Corporation, natural gas quality control and energy metering key practices Laboratory. The main drafters of this section. Han Hui, Luo Qin, Zeng Wenping, Li Ke, Zhang Ping, Yang Xuejun, Piao Jianshu, Sun Qi, Wu Hai, Sun Limin, Li Wei. The previous versions of the standards replaced by this part are as follows. ---GB/T 27894.2-2011.IntroductionISO 6974 provides natural gas analysis methods and methods for calculating component mole fractions and uncertainties. ISO 6974 (all parts) It is used to determine H2, He, O2, N2, CO2 and hydrocarbon compounds as a single component or a group of components, such as C5 or more (without C5) All hydrocarbon compounds are defined as C6.This method is suitable for calibrating gas mixture, calorific value of gas and calculation of other physical parameters Provide gas composition data and uncertain data, etc. ISO 6974-3.2000 and subsequent parts detail specific application methods. ISO 6974-1 specifies the use of gas chromatography as described in ISO 6974-3.2000 and subsequent sections to determine the composition of natural gas and calculate the friction. General guidelines for the score. ISO 6974-1 also gives all the basic steps to establish an analysis method, including an overview of the analysis structure and determining the work Scope and establish analysis procedures. This part of GB/T 27894 gives the uncertainty of using gas chromatography to determine the composition of natural gas and calculate the component mole fraction. step. ISO 6974-3.2000 and subsequent parts give different gas chromatography analysis methods, including daily laboratory analysis and online process application. Appendix A of ISO 6974-1.2012 gives a comparison of the analysis methods of ISO 6974-3.2000 and subsequent parts. This part of GB/T 27894 should be used in conjunction with the subsequent parts of ISO 6974-1 and ISO 6974 (such as ISO 6974-3..2000 Wait). 5.5 in ISO 6974-1.2012 gives a conventional normalization method for obtaining the processed mole fraction from the original mole fraction. for For the multiple operation method without bridging component, the uncertainty result calculated by conventional normalization is conservative. If you need to do more accurate For certainty assessment, generalized least squares (GLS) can be used instead of the normalization method, which is given in Appendix B of ISO 6974-1.2012 Out. In addition, there are other methods to calculate the processed mole fraction, such as the methane subtraction method (refer to ISO 6974-1.2012 Appendix C) and the number According to the coordination method [1]. Determination of composition and calculation of natural gas by gas chromatography Related uncertainty Part 2.Uncertainty calculation1 ScopeThis part of GB/T 27894 gives the uncertainty evaluation process for the mole fraction of each component in natural gas analysis. This part and GB/T 27894.1 is used in combination.2 Normative referencesThe following documents are indispensable for the application of this document. For dated reference documents, only the dated version applies to this article Pieces. For undated reference documents, the latest version (including the amendments used) applies to this document. ISO 6974-1.2012 Gas Chromatographic Determination of Natural Gas and Calculation of Related Uncertainties Part 1.General Guidelines and Groups Into calculation (Naturalgas-Determinationofcompositionandassociateduncertaintybygaschromatogra- phy-Part 1.Generalguidelinesandcalculationofcomposition) ISO /IEC Guide 98-3 Measurement Uncertainty Part 3.The Expression Method of Measurement Uncertainty (GUM.1995) [Uncer- taintyofmeasurement-Part 3.Guidetotheexpressionofuncertaintyin measurement(GUM. 1995)].3 Terms and definitionsThe terms and definitions defined in ISO 6974-1 apply to this document.4 symbols4.1 Symbols bz regression function parameters (z=0, 1, 2, or 3) bz regression function parameter average (applicable to the mean normalization method) Ci sensitivity coefficient k containment factor K Relative response factor relative to the reference component The total number of ni components (direct and indirect, but not including "other components") nj Total number of gas reference materials or mixtures nl Total number of injections (i.e. total number of responses) s standard deviation T The sum of the original mole fractions of all components u(..) (quantity in brackets) standard uncertainty U(..) (quantity in parentheses) expanded uncertainty ...... |
