How to check the tightness of a tube furnace?
Here are some common methods for checking the tightness of a tube furnace:
1. Pressure test method
- Close the inlet and outlet valves of the tube furnace and fill the furnace with a certain pressure of inert gas (such as nitrogen).
- Use a pressure gauge to monitor the changes in the pressure in the furnace. If the pressure remains stable for a period of time, it means that the tightness is good; if the pressure drops, there may be a leak.
2. Bubble detection method
- Apply soapy water or a special leak detection fluid to the part of the tube furnace where there may be a leak.
- If bubbles are generated, it indicates that there is a leak in that part.
3. Vacuum test method
- Connect the tube furnace to a vacuum pump, and turn off the vacuum pump after evacuating to a certain degree.
- Observe the changes in the vacuum degree. If the vacuum degree can remain stable for a long time, the tightness is good; if the vacuum degree drops, it means there is a leak.
4. Sensory detection method
- When running the tube furnace, listen carefully for the sound of gas leakage.
- Put your hand close to the part where the leak may occur and feel whether there is airflow.
5. Chemical detection method
- For some specific gases, chemical reagents can be used to detect whether there is a leak. For example, palladium test paper can be used to detect hydrogen leaks.
6. Infrared detection method
- Use an infrared thermal imager to detect the temperature distribution on the surface of the tube furnace. If there is a leak, the temperature of the leaking part may be different from that of other parts.
7. Smoke detection method
- A small amount of smoke can be released inside the tube furnace to observe whether the smoke leaks from the gaps in the furnace body.
It should be noted that when performing a sealing inspection, it is necessary to ensure safe operation and select a suitable detection method according to the specific structure and use conditions of the tube furnace.