The reason and treatment method of thermowell rupture

The rupture of the casing will inevitably occur when the thermocouple is used, which will directly affect the reliable and safe operation. Jiutian Instruments investigates the phenomenon of thermowell rupture to find the cause. It is found that the main reasons for the rupture of the thermowell are as follows: 1. The thermowell is impacted by high-speed fluid, the load is too large, and the stress exceeds the limit, resulting in the rupture of the casing; 2. The processing of the thermowell itself 3. Excessive vibration of the pipeline causes fatigue damage to the thermowell; 4. When the fluid flows through the thermowell, the thermowell is induced to vibrate, that is, the thermowell The natural frequency and the fluid vortex shedding frequency resonate. This resonance phenomenon can cause the thermowell to fail faster and break. Combining the above situations that can easily lead to the rupture of thermowells, we have conducted research together with the majors of thermal control and metal, and found that the occurrence of rupture of thermowells can be reduced by the following methods. 1) Strictly control the insertion depth of the thermowell. As the insertion depth increases, the force on the protective sleeve increases quadratically. Therefore, when we measure the temperature, we only need to insert the thermowell into the isothermal area of u200bu200bthe fluid without inserting it into the center point of the pipe, which is beneficial to shorten the length of the cantilever of the thermometer bag and reduce the amplitude of the end point. . 2) Under the condition of ensuring the necessary strength of the thermowell, the diameter of the thermowell is optimally selected. Because when the diameter of the thermowell increases, the force of the watch bag increases linearly, so when selecting the diameter of the watch bag, it is necessary to reasonably ensure the strength of the sleeve, and to stagger the resonance danger area as much as possible. 3) Change the cross-sectional shape, and process the surface into a structural type, so that the fluid does not have vortex shedding. 4) Strictly control the maintenance quality, do a good job in the material inspection of the thermowell, and at the same time do a good job of flaw detection to strictly prevent the occurrence of abnormal accidents such as weld cracks and fractures. 5) When the system is put into operation, avoid the sudden full opening of the valve on the pipeline. At the moment when the valve is just put into operation, the thermowell will bear a large one-way force. Therefore, when the system is just put into operation, the valve should be opened slowly, the system pressure will gradually rise, and the thermowell should be reduced as much as possible. The pressure difference between the front and the back prevents the casing from breaking due to excessive one-way force. The above is the product knowledge provided by Jiutian Instruments. I hope it can help you learn better. When any thermocouple is put into use, there will always be some unexpected situations. We need to combine theory with practice, according to the specific situation. , and propose corresponding solutions.

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