Turbine nozzle
Thread Content
For the first time in two years of operation of the new turbine, it was opened and several nozzle blades were found to be broken; at the same time, 15 holes of varying sizes were discovered around the shroud of the control stage blades. A preliminary analysis suggests that the hole was likely caused by a blade on the nozzle breaking and hitting the shroud of the moving blade. Is this a quality issue with the device? Is the analysis correct? I’m seeking help from the experts here.
What is the cause of the nozzle breaking? I would like to consider these aspects first: 1. Steam quality – whether the steam is clean and free of impurities ； 2. Cleanliness of the inlet pipeline: Was it properly purged and cleaned before startup? ； 3. Nozzle defects, material issues, and machining defects.
1. With so many nozzles broken, metallographic and fracture analysis, hardness testing, and chemical composition analysis should be conducted. 2. Check whether there are any obvious damages on the turbine inlet filter. 3. Whether the steam testing before startup was successful. Only after analyzing the reasons can further measures be taken to ensure that such situations do not occur.
Thank you all. It works fine after being hit, and the filter screen isn’t damaged either. A comprehensive analysis indicates that it is a problem with the material of the equipment.
Is the steam carrying water? With such severe damage, the blades in our factory have remained intact after four years of operation
This situation is very dangerous; once the nozzle breaks and damages the blades, the consequences can be severe
Whenever a user encounters equipment damage, they surely assume it is due to manufacturing defects; however, to claim that someone else’s product has quality issues, there must be evidence. At the same time, since there are no issues with the process or operation, it is also necessary to keep records of the data