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GB/T 34638-2017: Non-destructive testing -- Test methods for ultrasonic leak detection
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| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Standard Title (Description) | Status | PDF |
| GB/T 34638-2017 | English | 199 |
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Non-destructive testing -- Test methods for ultrasonic leak detection
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GB/T 34638-2017
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Basic data | Standard ID | GB/T 34638-2017 (GB/T34638-2017) | | Description (Translated English) | Non-destructive testing -- Test methods for ultrasonic leak detection | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | J04 | | Classification of International Standard | 19.100 | | Word Count Estimation | 10,199 | | Date of Issue | 2017-09-29 | | Date of Implementation | 2018-04-01 | | Issuing agency(ies) | General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China | GB/T 34638-2017: Non-destructive testing -- Test methods for ultrasonic leak detection---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 - Test methods for ultrasonic leak detection
ICS 19.100
J04
National Standards of People's Republic of China
Nondestructive testing ultrasonic leak detection method
2017-09-29 Posted
2018-04-01 implementation
General Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China
China National Standardization Administration released
Foreword
This standard was drafted in accordance with the rules given in GB/T 1.1-2009.
Please note that some of the contents of this document may involve patents. The release of this document
Organizations should not assume responsibility for identifying these patents.
This standard by the National Standardization Technical Committee nondestructive testing (SAC/TC56) and focal point.
This standard drafting unit. China Special Equipment Inspection and Research Institute, the State Nuclear Power Station Service Technology Co., Ltd., Shanghai Thai Division Detection Technology
Co., Ltd., Hebei Province, Boiler and Pressure Vessel Supervision and Inspection Institute.
The main drafters of this standard. Zhang Jun Jiao, Shen Gongtian, Qin Xiangyong King for Section, Court, Lin, Qian Zhengyu, Zhang Jian, Zhang Yiming, Wu accounted for stability,
Wang Weihua, Fu Jianping.
Nondestructive testing ultrasonic leak detection method
1 Scope
This standard specifies the ultrasonic leak detection method and the results of evaluation.
This standard applies to the working medium for the gas or liquid in the use of airtight equipment or components during the operation of the leak detection.
2 Normative references
The following documents for the application of this document is essential. For dated references, only the dated version applies to this article
Pieces. For undated references, the latest edition (including all amendments) applies to this document.
GB/T 9445 non-destructive testing personnel qualification and certification
GB/T 12604.7 Non-destructive testing term leak detection
GB/T 20737 non-destructive testing common terms and definitions
3 Terms and definitions
GB/T 12604.7 and GB/T 20737 defined terms and definitions apply to this document.
4 Method summary
Ultrasonic leak detection technology is the use of ultrasonic technology to detect leaks, with easy to operate, fast, environmentally friendly and low cost special
point. For fluid-filled containment devices, when the internal pressure is greater than the external pressure, once a leak occurs, the fluid medium due to internal and external pressure
The existence of the hole will be punched out. When the size of the leak hole is small, the flushing fluid forms a turbulent flow, and the turbulent flow will generate a certain frequency near the leak hole
Sound waves and can spread in the air. The main frequency of acoustic vibration and leaky hole size, when the frequency of 20Hz ~ 20kHz, the human ear can hear
To leak sound, when the frequency is greater than 20kHz, the ultrasonic signal. Ultrasound has good directivity, its intensity with the propagation distance
Increase and rapidly decay, through the use of specialized instruments to detect the energy of these ultrasonic signals can determine the location of the leak and measure the leak
small. Figure 1 shows the schematic diagram of ultrasonic leak detection. The ultrasonic signal generated by the leak can be received by the ultrasonic leak detector through the probe. versus
Compared to most leak detection methods, the sensitivity of the ultrasonic leak detection method is low, and the pressure conditions of the device under test, the size of the leak hole, the leak
Hole location and probe spacing and other factors, the maximum sensitivity of the existing equipment 1 × 10-3Pa · m3/s, does not apply to have a fatal or dangerous
Acceptance testing of airtight equipment for hazardous substances.
Ultrasonic leak detection principle shown in Figure 1.
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