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GB/T 6683.1-2021: Petroleum and related products - Precision of measurement methods and results - Part 1: Determination of precision data in relation to methods of test
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Petroleum and related products - Precision of measurement methods and results - Part 1: Determination of precision data in relation to methods of test
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GB/T 6683.1-2021
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| GB/T 6683-1997 | English | RFQ |
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Petroleum products-Determination of precision data in relation to methods of test
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Petroleum products--Determination and application of precision data in relation to methods of test
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Basic data | Standard ID | GB/T 6683.1-2021 (GB/T6683.1-2021) | | Description (Translated English) | Petroleum and related products - Precision of measurement methods and results - Part 1: Determination of precision data in relation to methods of test | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | E30 | | Word Count Estimation | 70,751 | | Issuing agency(ies) | State Administration for Market Regulation, China National Standardization Administration | GB/T 6683.1-2021: Petroleum and related products - Precision of measurement methods and results - Part 1: Determination of precision data in relation to methods of test
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Petroleum and related products - Precision of measurement methods and results - Part 1.Determination of precision data in relation to methods of test
ICS 75.080
CCSE30
National Standards of People's Republic of China
Replace GB/T 6683-1997
Petroleum and related products measurement methods and precision of results
Part 1.Determination of the precision data of the test method
(ISO 4259-1.2017, MOD)
Released on 2021-10-11
2022-05-01 implementation
State Administration for Market Regulation
Issued by the National Standardization Management Committee
Table of contents
Foreword Ⅰ
Introduction Ⅲ
1 Scope 1
2 Normative references 1
3 Terms and definitions 1
4 Inter-laboratory research planning stage to determine the precision of the test method 4
4.1 General 4
4.2 Preparation of draft test method 4
4.3 Design preliminary trials involving at least two laboratories 4
4.4 Inter-Design Lab Research 4
4.5 Performing inter-laboratory research 5
5 Statistical processing of research results between laboratories 6
5.1 General Recommendation 6
5.2 Pre-screening using generalized extreme mean deviation (GESD) technology 6
5.3 Data transformation and outlier test 7
5.4 Discard all data from a sample (from all laboratories) 13
5.5 Estimate missing or discarded values 14
5.6 Abandonment of Outlier Laboratory Test 14
5.7 Confirmation of the selected transformation 15
6 Calculation and expression of variance analysis and precision estimation 16
6.1 General 16
6.2 Analysis of variance 17
6.3 Mean Square Expectation and Precision Estimate Calculation 19
6.4 Expression of test method precision 21
Appendix A (informative) Formula derivation for estimating the number of laboratories and samples required to reach at least 30 degrees of freedom 23
Appendix B (Normative) Determination of the number of samples required 25
Appendix C (Normative) Data and tables required for statistical processing and inspection 26
Appendix D (Normative) GESD technology for simultaneous determination of multiple outliers in data 30
Appendix E (Normative) Examples and statistical tables of results of inter-laboratory studies on bromine number 37
Appendix F (Normative) Association Type and Corresponding Transformation 45
Appendix G (Normative) Weighted Linear Regression Analysis 51
Appendix H (Normative) Repeatability standard deviation and laboratory standard deviation are transformed in different ways 54
Appendix I (Informative) Summary of Symbols and Explanations 62
Reference 65
Foreword
This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for Standardization Work Part 1.Structure and Drafting Rules of Standardization Documents"
Drafting.
This document is the first part of GB/T 6683 "Measurement Methods and Precision of Results for Petroleum and Related Products". GB/T 6683 has
The following sections were released.
---Part 1.Determination of the precision data of the test method.
This document replaces GB/T 6683-1997 "Precision Data Determination Method for Petroleum Products Test Methods", and is consistent with GB/T 6683-1997
In addition to structural adjustments and editorial changes, the main technical changes are as follows.
a) Added and changed some terms and definitions (see Chapter 3, Chapter 3 of the.1997 edition);
b) Preliminary test procedures have been added (see 4.3);
c) Increased the parameter leverage ratio of the inspected samples (see 4.4);
d) The method of determining the number of laboratories and the number of samples has been changed (see 4.4, 4.3 in the.1997 edition);
e) The specific requirements for performing inter-laboratory research have been changed (see 4.5, 4.4 and 4.5 of the.1997 edition);
f) Added flow chart 1 (see 5.1) showing the procedure of transformation and outlier detection;
g) The technology "Generalized Extreme Average Deviation (GESD)" (see 5.2), which is used for the results of the pre-screening test, has been added;
h) Added the requirements and examples of whether data transformation is required and whether the transformation is successful or not (see 5.3.1);
i) A description of outliers has been added (see 5.3.2);
j) Added the requirement to check whether the used transformation is valid after discarding the outlier data (see 5.6);
k) Added the requirements, methods and examples of selected transformation confirmation (see 5.7);
l) The expression including the expectation of the mean square of the estimated value has been changed (see 6.3.2, 6.2.2 of the.1997 edition);
m) Added suggestions for optimizing the test method when the degree of freedom of reproducibility is less than 30 (see 6.3.3.2);
n) The precision expression method has been changed (see 6.4, 6.3 of the.1997 edition);
o) The instructions for determining the number of samples have been added as Appendix B;
p) Changed Appendix C on data tables and inspections (see Appendix C, Appendix A of the.1997 edition);
q) Added a description of GESD technology as Appendix D;
r) The calculation of the critical value of the normal distribution has been added (see E.8 in Appendix E);
s) Appendix F of the association type and transformation has been changed (see Appendix F, Appendix C of the.1997 edition);
t) Added the description of weighted linear regression analysis as Appendix G;
u) The method of using different transformations for repeatability and reproducibility has been added as Appendix H.
This document uses the redrafting method to modify and adopt ISO 4259-1.2017 "Petroleum and Related Products Measurement Methods and Results Precision No.
Part 1.Determination of the precision data of the test method".
Compared with ISO 4259-1.2017, this document has made the following structural adjustments.
---Adjusted the number and order of appendices;
---Move the calculation example content in Appendix D into 5.3~6.3;
--- Move the content of F.3 into Appendix G;
--- Move the content of F.4 into 5.3.1.
The main technical differences between this document and ISO 4259-1.2017 and the reasons are as follows.
---Regarding normative reference documents, this document has made adjustments with technical differences to adapt to my country's technical conditions and adjustments.
The situation is collectively reflected in Chapter 2 "Normative Reference Documents", and the specific adjustments are as follows.
● Replace ISO 5725-2.1994 (see 5.3.1) with GB/T 6379.2 which is equivalent to the international standard;
● Added reference to GB/T 8170 (see H.5.1).
--- Increase the repeatability and reproducibility of using different transformation methods to meet the requirements of use.
---The terms 3.6 and 3.10 that are not used in the text in ISO 4259-1.2017 are deleted.
---Deleted ISO 4259-1.2017 6.5 on the scope of the test method to adapt to the situation in my country.
---Deleted ISO 4259-1.2017 6.6 on the test method report limit description, in order to adapt to my country's use.
---Deleted the description of the R/r ratio in Chapter 7 in ISO 4259-1.2017 to adapt to the situation in my country.
---The introduction of symbols in ISO 4259-1.2017 C.1 was deleted to meet the requirements of GB/T 1.1.
--- Deleted the content about amendments in Appendix G of ISO 4259-1.2017.
The following editorial changes have been made to this document.
---Incorporated the amendments of ISO 4259-1.2017/Amd1.2019 and ISO 4259-1.2017/Amd2.2020, which are involved
The terms of has been marked by a vertical double line (‖) on the outer margin of the page;
---Changed Figure 1 in 5.3.1 to reflect the technical differences between this document and ISO 4259-1.2017;
---Changed the expression in 5.3.3 to conform to the Chinese expression habits;
---Changed the expression in 5.3.4 to conform to the Chinese expression habits;
---Changed the expression in 5.4 to conform to the Chinese expression habits;
---Change the symbol K in 6.3.2 (change to J) to avoid duplication with K in 5.3.1 formula (5);
--- Deleted the formulas and chapters in Table I.1 to avoid duplication.
Please note that some of the contents of this document may involve patents. The issuing agency of this document is not responsible for identifying patents.
This document was proposed and managed by the National Petroleum Products and Lubricants Standardization Technical Committee (SAC/TC280).
Drafting organizations of this document. China Petroleum & Chemical Corporation Research Institute of Petrochemical Technology, Nankai University.
The main drafters of this document. Zhao Yue, Yang Tingting, Zhang Yan, Chang Chunyan, Hao Lichun.
The previous releases of this document and the documents it replaced are as follows.
---First released in 1986, first revised in.1997;
---This is the second revision.
Introduction
In order to carry out quality control and check the conformity of products with specifications, it is necessary to use standard test methods to evaluate the properties of petroleum products. By specifying
In the same or different methods, two or more measurements of the same property of a specific sample often fail to obtain completely consistent results. because
Therefore, it is necessary to estimate the precision of the test method based on statistical principles, that is, the expected agreement between two or more results under a specified state.
Objective measurement of degree. This document gives the procedure for determining the precision of the test method and the application of the precision data. GB/T 6683 is proposed to consist of five
Partial composition.
---Part 1.Determination of the precision data of the test method. The purpose is to establish the method of designing inter-laboratory research (ILS), and adopt
Use this study to estimate the calculation method of the precision of the test method.
---Part 2.Interpretation and application of test method precision data. The purpose is to establish. when the nature is determined by a specific test method
The method of setting the property specification limit based on the precision of the test method, and when the supplier and the consignee obtain inconsistent results
Judgment of the conformity status of the case.
---Part 3.Monitoring and confirmation of the precision data of the test method. The purpose is to establish the precision of daily monitoring test methods
The method of comparing the precision with the published precision in the standard test method.
---Part 4.Laboratory verification that the test method standards are in a statistically controlled state. The purpose is to determine the use of statistical control
Figure, a method to confirm whether a single laboratory is under control when implementing test method standards.
---Part 5.Evaluation of the relative deviation between different methods of measuring the same characteristic. The purpose is to establish the
The statistical research method of relative deviation, and the determination of the functional relationship between relative deviations.
Petroleum and related products measurement methods and precision of results
Part 1.Determination of the precision data of the test method
1 Scope
This document describes the method of designing an inter-laboratory study (ILS) and the calculation method used to estimate the precision of the test method using the study.
This document specifies the steps of the ILS plan (Chapter 4) to determine the precision of the test method, as well as the calculation of the precision based on the results of the study.
Density method (Chapter 5 and Chapter 6).
The procedures specified in this document apply to homogeneous petroleum and related products. The procedures specified in this document can be applied to other types of homogeneous production
Care must be taken when applying to products whose uniformity has yet to be verified.
2 Normative references
The content of the following documents constitutes an indispensable clause of this document through normative references in the text. Among them, dated quotations
Only the version corresponding to the date is applicable to this document; for undated reference documents, the latest version (including all amendments) is applicable to
This document.
GB/T 6379.2 Accuracy of measurement methods and results (accuracy and precision) Part 2.Determine the repeatability of standard measurement methods
Basic methods of performance and reproducibility (GB/T 6379.2-2004, ISO 5725-2.1994, IDT)
GB/T 8170 Numerical rounding rules and the expression and determination of limit values
3 Terms and definitions
The following terms and definitions apply to this document.
3.1
Analysis of variance; ANOVA
A technique for decomposing the total variation of the response variable into several meaningful components to determine the source of the variation.
[Source. GB/T 3358.3-2009, 3.4, with modification]
3.2
Accepted reference value acceptedreference value; ARV
The agreed standard values used for comparison include.
a) Theoretical or determined value based on scientific principles;
b) The designated value or certified value based on the experimental work of some countries or international organizations;
c) According to the agreed value or certification value in the cooperative experimental work under the auspices of a scientific or engineering organization;
d) When a), b), and c) cannot be obtained, the measurable expectation is used, that is, the average value of the measurement population is specified.
Note. For example, results obtained by inter-laboratory research.
[Source. GB/T 3358.2-2009, 3.2.7, with modification]
3.3
Betweenlaboratoryvariance
The components of the total variance can be attributed to the differences in the mean values of different laboratories.
Note 1.When comparing the results obtained by multiple laboratories, the dispersion is usually wider than the results obtained by a single laboratory for the same number of tests.
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