GB/T 36176-2018 in English
VALIDVacuum technology--Vacuum leak testing method by helium mass spectrometer
- Issued on:2018-05-14
- Implemented on:2018-12-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
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《GB/T 36176-2018真空技术 氦质谱真空检漏方法》由TC18（全国真空技术标准化技术委员会）归口，主管部门为中国机械工业联合会。
Introduction
National Standard of the People's Republic of China GB/T 36176—2018
Vacuum Technology Nitrogen Mass Spectrometry Vacuum Leak Detection Method
Standard Background and Significance
GB/T 36176—2018 "Vacuum Technology Nitrogen Mass Spectrometry Vacuum Leak Detection Method" is an important standard in the field of vacuum technology, which mainly regulates the method of vacuum leak detection using nitrogen mass spectrometer. This standard is managed by the National Technical Committee for Vacuum Technology Standardization, covering the general requirements for leak detection, three main leak detection methods (spray method, ammonia hood method, pressure-vacuum leak detection method) and requirements for leak detection documents.
Explanation of core terms
| Terms | Definition | Actual application scenarios |
|---|---|---|
| Leak detection sensitivity | The minimum leak rate that a leak detection system can detect under specific working conditions. | Used to evaluate the performance indicators of a mass spectrometer leak detector to ensure that it meets the requirements of the test piece. |
| Spray method | A method of using a spray gun to spray a known concentration of ammonia gas beam to scan the surface of the test piece for leak detection. | It is suitable for leak location and quantitative analysis, and is often used for the detection of complex components. |
Standard Framework Comparison
Compared with other vacuum leak detection standards, GB/T 36176—2018 has the following characteristics:
| Dimensions | GB/T 36176—2018 | Other standards |
|---|---|---|
| Leak detection methods | Includes the spray method, the ammonia hood method and the pressure-vacuum leak detection method. | Mostly single methods or simplified processes. |
| Sensitivity requirements | Explicitly require the sensitivity to be better than one tenth of the allowable leakage rate of the test piece. | Not specifically quantified, only stipulated in principle. |
Implementation suggestions
Case analysis: practical application of the spray method
Background:A certain aerospace component needs to be vacuum leak tested, and the spray method is used to locate the leak point.
Implementation steps:
- Preparation stage: Calibrate the sensitivity of the leak detector to ensure that it meets the detection requirements.
- Pre-treat the surface of the test piece to remove oil and excess.
- Spray gun scanning: distance ≤6mm, speed <8mm/s, test time ≥3 times the reaction time.
- Record the leak point location and reaction value, and calculate the leak rate.
Result: Successfully locate and quantify multiple leak points, meeting the product's allowable leak rate requirements.
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