GB/T 40335-2021 English PDFUS$409.00 · In stock
Delivery: <= 4 days. True-PDF full-copy in English will be manually translated and delivered via email. GB/T 40335-2021: Non-destructive testing - Leak testing - Tracer gas method Status: Valid
Basic dataStandard ID: GB/T 40335-2021 (GB/T40335-2021)Description (Translated English): Non-destructive testing - Leak testing - Tracer gas method Sector / Industry: National Standard (Recommended) Classification of Chinese Standard: J04 Word Count Estimation: 22,223 Issuing agency(ies): State Administration for Market Regulation, China National Standardization Administration GB/T 40335-2021: Non-destructive testing - Leak testing - Tracer gas method---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-Tracer gas method ICS 19.100 CCSJ04 National Standards of People's Republic of China Non-destructive detection leak detection tracer gas method (ISO 20485.2017, 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 contentsForeword Ⅲ 1 Scope 1 2 Normative references 1 3 Terms and definitions 1 4 Detection principle 1 5 Tracer gas detection 1 6 Testing equipment 2 7 Test preparation 2 8 Vacuum testing (Group A technology) 2 9 Positive pressure detection (Group B technology) 5 10 Test report 12 Appendix A (informative) Technical differences between this document and ISO 20485.2017 and the reasons 13 Appendix B (informative) Accumulative detection technology calibrated leak and unknown volume seal cover connection 14 Reference 16ForewordThis 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 20485.2017 "Non-destructive testing leak detection tracer gas method". Compared with ISO 20485.2017, this document has technical differences. The set vertical single line (|) is marked, and the corresponding technical differences and reasons are given in Appendix A. 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 Standardization Technical Committee for Nondestructive Testing (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. Sui Xiaoxiang, Zhang Hongxing, Jiang Jiansheng, Han Lina, Huang Yin, Huang Yifeng, Wu Gang, Mu Xiaocheng, Guo Chongwu, Yuan Cuiping, Zhang Haifeng, Qi Lei, Xu Wei, Xu Guozhen, Zhou Pengfei. Non-destructive detection leak detection tracer gas method1 ScopeThis document specifies the technical methods for leak detection using tracer gas and tracer gas leak detectors. This document applies to the use of tracer gas leak detection to detect leaks and determine the location of the leak.2 Normative referencesThe 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)3 Terms and definitionsThe terms and definitions defined in GB/T 12604.7 apply to this document.4 Detection principleA partial pressure difference of tracer gas is established on both sides of the boundary of the test piece. After the tracer gas passes through the leak, it is detected by its chemical or physical properties Measurement. Based on the detection of the chemical properties of the tracer gas, the detection is usually due to a chemical reaction that produces a local color change on the surface of the test piece, so The inspected parts are required to be visually visible. Based on the detection of the physical properties of the tracer gas, the feedback electrical signal is usually used to change the partial pressure of the tracer gas. sensor. Commonly used instruments and equipment containing sensors are as follows. --- Mass spectrometer leak detector. used for specific tracer gas, generally 4He; ---Alkali ion diode. used for halogen gas; ---Electronic capture equipment. used for SF6, etc.; ---Pirani vacuum gauge. used for tracer gases with different thermal conductivity from air; ---Photometer. The emission or absorption frequency of the tracer gas is within the bandpass filter frequency range of the photometer. The detection conditions should be jointly determined and agreed by the leak detection personnel and the customer, and the leak detection personnel should record the detection report in detail (see Chapter 10).5 Tracer gas detection5.1 Vacuum testing (Group A technology) The test piece is evacuated or placed in a pressurized container to generate a pressure difference between the inner and outer walls of the test piece (usually using a vacuum method). Adopt full indication A shield or container of tracer gas wraps the inspected part (whole or partial), or a spray gun is used to apply the tracer gas to the outer wall of the inspected part. By built-in or The sensor connected to the inside of the inspected piece detects the tracer gas leaking to the inspected piece. ...... |
