The pump seal is damaged frequently

It’s really troublesome when machine seals get damaged frequently; not only does it require frequent replacements, but it also disrupts production. I have encountered similar situations before; you can start by checking these aspects: First, verify the operating parameters to see if the pump’s pressure and temperature exceed the design limits of the seal, and also check whether there are any particulate impurities in the fluid, as such impurities can easily damage the sealing surfaces ； Then check the alignment of the pump shaft; if the radial runout is excessive, it will also accelerate the wear of the mechanical seal ； If a single-face mechanical seal is currently in use, considering switching to a double-face mechanical seal with flushing could improve the sealing environment. If you’re not sure about the exact reason, it’s best to invite a professional pump repair technician or a manufacturer of seal components to come and take a look; after all, both the selection of the pump and the details of its installation have a significant impact on its service life~

If the original service life is very long, but it becomes shorter after the seal is damaged and replaced. This phenomenon is mostly caused by damage to the contact surface between the shaft and the mechanical seal. The proper solution is to use fine sandpaper to polish the damaged shaft surface, thereby ensuring a smooth finish, especially when the damage is relatively minor. If the damage is severe, it should be rewelded, turned and polished, before the mechanical seal can be installed. The precision of the contact surface between the shaft and the mechanical seal must be restored to its original state; otherwise, the service life will be extremely short. This is the most common installation-related quality issue, for reference only.

Thank you to the original poster for their generous sharing. I personally think it’s a installation issue; I’ve never seen leakage on such a scale. Is it a single-machine ban? It is recommended to replace high-temperature heavy oil with a double mechanical seal

It is best to provide clear information on the existing basic parameters, such as the equipment, medium, viscosity, temperature, pressure, rotation speed, as well as operational conditions and flushing procedures. It is also important to know how long it has taken for the current seal to start leaking, so that a thorough analysis can be conducted. Otherwise, even if a different type of seal is used, it may not resolve the underlying problem.

It would be best to provide clearer basic information, such as the device type, medium (including its properties), viscosity, temperature, pressure, flushing procedures, rotation speed, and operating conditions, as well as how long it has taken for the existing seal to start leaking. This information is necessary for a targeted analysis; otherwise, even if a different type of seal is used, the underlying problem may not be resolved.

Looking at the picture, there is a plug, but are no pipes connected? Or isn’t any flushing scheme connected at all?

1. Are the perpendicularity between the sealing installation surface of the pump casing and the shaft, as well as the radial runout and axial movement of the shaft, within acceptable limits? 2. Are the selection and material inappropriate? Is the seal ring aged, deformed, or corroded?； There is coking on the sealing surface ； The lubricant lacks sufficient antioxidant properties. If possible, could you provide more details such as the type of pump, the medium being transported, and the specific condition of the sealing surfaces at the time of failure? This will allow me to help analyze the causes more accurately.