Problems with the labyrinth seal clearance in centrifugal pump bearing housings

This is usually determined based on the bearing clearance; the sealing clearance is typically 2 to 2.5 times the bearing clearance.

Check whether the ventilation holes are unobstructed! Increase the depth and width of the sealing groove appropriately! Increase the number of grooves! It’s also an effective method!

Oil leakage is a relatively common issue. Under normal circumstances, when the pump is installed, the gap of the labyrinth seal is already designed and adjusted properly. In the event of oil leakage, in addition to considering the gap of the labyrinth seal, the assembly condition of the labyrinth seal should also be taken into account. After excluding the impacts of other factors, the amount of lubricant added should also be considered. Oil leakage can also occur when the level of lubricating oil is too high.

At the work site, over 90% of the cases are caused by overfilling. And the operators still refuse to change their behavior despite repeated warnings! Ah!

The fifth floor is definitely the right choice. We keep running into this problem during maintenance – it’s extremely annoying. These people who fill up the tank just do it blindly, without considering the oil level at all; they have no idea what the fuel level indicators mean. If there are no major problems with the pump, generally the comb teeth will not have any issues

I work in the field of manufacturing processes. Sometimes, people don’t intentionally add too much fluid; according to standard procedures, the amount added should be between 1/2 and 2/3 of the capacity, with 2/3 being the typical level. However, many people aren’t aware that adding too much fluid can cause leaks. Why does adding too much fluid lead to leaks? What is the appropriate amount to add?

I work in the field of manufacturing processes. Sometimes, people don’t intentionally add too much fluid; according to standard procedures, the amount added should be between 1/2 and 2/3 of the capacity, with 2/3 being the typical level. However, many people aren’t aware that adding too much fluid can cause leaks. Why does adding too much fluid lead to leaks? What is the appropriate amount to add?

I work in the field of manufacturing processes. Sometimes, people don’t intentionally add too much fluid; according to standard procedures, the amount added should be between 1/2 and 2/3 of the capacity, with 2/3 being the typical level. However, many people aren’t aware that adding too much fluid can cause leaks. Why does adding too much fluid lead to leaks? What is the appropriate amount to add?

Generally, the lubricant level should be at the middle horizontal level of the balls (rollers) at the bottom of the bearing. During operation, it is sufficient to fill the oil level to 1/2 of the oil sight glass; if stopping the machine, the level can be filled to 2/3 of the oil sight glass. If there is an oil filler cap, fill it with 2/3 of lubricant – do not fill it to the top. A little more won’t cause oil leakage; the technicians on site usually keep the oil level (as indicated by the oil gauge) at its maximum during operation, and they also fill the oil refill container to the brim. They believe this is the only way to ensure safety! If the bearing housing uses an oil seal, there will be no oil leakage; whereas if it uses an oil baffle (labyrinth) design, oil leakage will occur. Signs were placed on the spot, but it didn’t help. In a hurry! :L:L

Check whether there is any blockage in the fuel tank vent. Also, do not fill the tank too much, as this can cause siphoning effects and result in lubricant continuously spilling out. Furthermore, some pump manufacturers design the oil level gauge at a somewhat high position, which also makes it difficult to control the amount of fuel added. Observe the situation closely on site