Mechanical seal leakage detection method and characteristics - Database & Sql Blog Articles

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Kaixin micro test

Test probe P100-M3

The characteristics of the mechanical seal leak detection method are mainly as follows.

1. Principle of leak detection

Regardless of which leak detection method is used, the basic principles must be understood. The leak detection method covers a wide range of content and reflects various measurement and testing techniques. It is not easy to understand in detail the principles of many detection methods.

2. Sensitivity

The sensitivity of the leak detection method can be expressed by the minimum leak rate detectable by this method. The sensitivity of the various methods should be considered when choosing the leak method, ie which method can be used to detect which level of leakage rate. For example, to detect a leak rate of 10-5 cm3/s, the method of using a sensitivity of 10-2 cm3/s is unreasonable. Conversely, when detecting a leak rate of 102 cm 3 /s, a method with a sensitivity of 10-5 cm 3 /s may be feasible in principle, but may actually be uneconomical.

3. Response time

Regardless of the method used, it takes a certain amount of time to detect the leak rate. The length of response time may affect the accuracy and sensitivity of the leak detection. Generally, prolonging the detection time increases the sensitivity, but the detection time is too long, and the detection accuracy may be lowered due to changes in environmental conditions. The response time includes the response time of the test instrument itself, the lag time of the gas flow, and the time required for various preparations. This must be taken into account when choosing a leak detection method.

4. Judgment of the leak point

Some leak detection methods can only determine whether the system has a leak, but it is impossible to determine where the leak is. Some leak detection methods can not only determine the leak point, but also determine the leak rate. If the method is just to find out whether the device is qualified, the former method can be used; when repairing or finding the cause of the leak, the latter method must be used, and sometimes the latter method may be missed. .

5. Consistency

For some leak detection methods, the test results obtained are basically the same regardless of whether the testers are skilled or not; some methods are used by both laymen and laymen, and the results are completely different. Where possible, methods that do not require skilled expertise can be used for proper detection. Each method has different technical key points, and different leak detectors may not be able to produce consistent leak detection results.

6. Stability

Leak detection is a comprehensive technique for metering and testing. If the data obtained from the test is unstable, it makes no sense. Proper leak detection requires not only the stability of the test instrument, but also the stability of the test method itself.

7. Reliability

Failure to detect a leak does not mean that there is no leak, which should be judged. When using a method to detect leaks, you should know if the method is reliable. The reliability of the leak detection results is related to various factors such as the consistency and stability of the method described above.

8. Economics

Economics is one of the keys to choosing a leak detection method. It is easier to consider the economics of the leak detection method itself, but it is more difficult to comprehensively evaluate the economics of the leak detection method from the aspects of the required leak detection equipment, personnel technical literacy, and leak detection results.

For example, soapy liquid leak detection is a very economical method, but small leaks cannot be detected using this method and, therefore, cannot be used in applications where leakage is high. When using an expensive helium mass spectrometer leak detector, multiple smaller leaks can be detected very quickly. Therefore, it is difficult to say in general terms, which of the above two methods is uneconomical?

It can be seen that when selecting the leak detection method, in addition to considering its economics, it is necessary to comprehensively evaluate the sensitivity, response time, and detection requirements, so that the selected leak detection method not only meets the leak detection requirements, but also is economically reasonable.