GB/T 40336-2021 English PDF

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GB/T 40336-2021: Non-destructive testing - Leak testing - Calibration of reference leaks for gases
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Basic data

Standard ID: GB/T 40336-2021 (GB/T40336-2021)
Description (Translated English): Non-destructive testing - Leak testing - Calibration of reference leaks for gases
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: J04
Word Count Estimation: 30,374
Issuing agency(ies): State Administration for Market Regulation, China National Standardization Administration

GB/T 40336-2021: Non-destructive testing - Leak testing - Calibration of reference leaks for gases

---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.
Non-destructive testing-Leak testing-Calibration of reference leaks for gases ICS 19.100 CCSJ04 National Standards of People's Republic of China Non-destructive testing leak detection Calibration of the gas reference leak (ISO 20486.2017, MOD) Released on 2021-05-21 2021-12-01 implementation State Administration of Market Supervision and Administration Issued by the National Standardization Management Committee

Table of contents

Foreword Ⅲ 1 Scope 1 2 Normative references 1 3 Terms and definitions 2 4 Nominal leak rate 2 5 Classification of leaks 2 6 Comparison calibration 3 7 Volume calibration 7 8 Overall impact 21 9 Report 21 10 Reference leak label 22 11 Reference leak operation 22 Appendix A (informative) Calculation of the loss of tracer gas in the gas chamber resulting in a decrease in the leakage rate 23 References 25

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 uses the redrafting method to modify and adopt ISO 20486.2017 "Non-destructive testing of leak detection gas reference leak calibration". Compared with ISO 20486.2017, this document has the following structural adjustments. ---The chapter number of this document is 3.2, which corresponds to the ISO 20486.2017 chapter number 3.3; ---The chapter number 3.3 of this document corresponds to the ISO 20486.2017 chapter number 3.4; ---The chapter number of this document is 7.4.2.2, which corresponds to the ISO 20486.2017 chapter number 7.4.2.1; ---The chapter number 7.4.2.3 of this document corresponds to the chapter number 7.4.2.2 of ISO 20486.2017. Compared with ISO 20486.2017, there are technical differences between this document, and the clauses involved in these technical differences have been passed on the outer margins. The vertical single line (|) of the position is marked, and the corresponding technical differences and their reasons are as follows. a) Modified the description of the scope of application of this document in Chapter 1 to make the description of the scope of application more concise and comprehensive; b) Regarding normative reference documents, ISO 20486 is replaced by GB/T 12604.7, which is modified and adopted by the international standard, to adapt to my country Technical conditions; c) Deleted the ISO 20486.2017 term and definition "3.2 Reference Leak", this term has been defined in GB/T 12604.7, no Repeat the list again; d) The notes in Chapter 4 have been added to adapt to my country's technical conditions and usage habits. This document has also made the following editorial changes. ---Added 7.2.4 and 7.3.4 introductory words; ---Modified the number of formulas in international standards. 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 Non-destructive Testing Standardization Committee (SAC/TC56). Drafting organizations of this document. China Guangdong Nuclear Testing Technology Co., Ltd., Shanghai Materials Research Institute, Beijing Satellite Environmental Engineering Research Institute, Shanghai Aerospace General Equipment Manufacturing Co., Ltd., Aerospace Intelligent Manufacturing (Shanghai) Technology Co., Ltd., Shanghai Aerospace Precision Machinery Research Institute. The main drafters of this document. Liu Zhonghua, Wang Bin, Liu Buliang, Gao Jianmin, Zhang Wei, Jiang Jiansheng, Han Lina, Huang Yin, Meng Donghui, Ren Guohua, Zhou Xueqian, Pan Ying, Xu Wei, Xu Guozhen, Zhou Pengfei. Non-destructive testing leak detection Calibration of the gas reference leak

1 Scope

This document specifies two types of calibration methods for leaks used when adjusting the leak detector to determine the leak rate. One is to compare with the reference leak. Calibration, the other is to calibrate directly by measuring or calculating the gas pressure with a known volume. This document applies to the calibration of leaks with leak rates within the range shown in Figure 1. a) Comparison calibration b) Volume calibration Normal range; possible range. Indexing serial number description. X --- Leak rate, in Pascal cubic meters per second (Pa·m3/s); A ---Method A; B ---Method B; AS---Method AS; BS---Method BS; C ---Method C; D ---Method D; E --- Method E; F ---Method F; G ---Method G. Figure 1 Calibration range

2 Normative references

The contents of the following documents constitute the indispensable clauses of this document through normative references in the text. Among them, dated quotations Only the version corresponding to that date is applicable to this document. For undated reference documents, the latest version (including all amendments) applies to This document. GB/T 12604.7 Non-destructive testing terminology leak detection (GB/T 12604.7-2021, ISO 20484.2017, MOD) ......

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