What are good solutions for external leakage at the packing seal of a mixing tank?
Thread Content
The hydraulically driven stirring shaft experiences slight oscillation during rotation, and the shaft seal at the top of the tank is fitted with packing. Dust material inside the tank at the filling area is leaking out. Do any of you guys have any good solutions? Thanks in advance
It depends on the vibration level of the stirring shaft! If the swinging is severe, the only option is to adjust the mixing device to reduce the vibration! If the swing isn’t significant, you can try replacing the asbestos packing strips; will that work? No, it’s necessary to replace it with a mechanical seal.~
1. Adjust the gland bolts. 2. Replace the packing. 3. Apply lubricant. 4. Replace the bearings. 5. Replace the shaft. 6. Build a brand new one
Is the reason for the leakage of dust material inside the tank at the packing area due to excessive swinging of the stirring shaft and high rotation speed, which accelerates the wear of the packing? How long is the lifespan of the filler? What filler do you use? Is there cooling water at the filler?
Simple solution: Try using a PTFE wound packing belt.
Adjust the bearing clearance to reduce vibration. Replace with new packing
It depends on the amplitude of the vibration, the extent of dust leakage, the hazard level of the medium, and the degree to which the process is affected. If it is acceptable, ways can be considered to address the issue with the filler, and the root cause can be investigated and resolved during the regular maintenance ； If production really can’t proceed, then there’s no choice but to shut down the plant for maintenance
Thank you all for your replies. Install compressed air purge to directly blow the dust that is about to leak back into the tank. Let’s give it a try like this for now
The poster needs to provide the following characteristics of the medium inside the reactor and the operating conditions: properties of the material, size of the reaction reactor, diameter of the stirring shaft, pressure, temperature, material used, and type of stirring. 1. The packing seal has slight leakage, but there is no dust escaping, which indicates that the leakage is not small ； 2. What material is the filler that the poster uses frequently? Is it graphite, asbestos, or polytetrafluoroethylene? Is polytetrafluoroethylene dry-type or oil-type? It is recommended to use the oil-type version, as it yields better results ； 3. The packing seal structure should be modified further; it would be ideal to add a nitrogen supply valve to blow a small amount of nitrogen into the reactor, but this needs to be discussed with the process team. 4. If the medium inside the tank is hazardous, it is recommended to replace it with a mechanical seal ；