Industry News

At our location, we have 18 large pulverizer gearboxes that hold nearly 175 gallons of oil. The oil temperature is approximately 120 to 150 degrees F. Some of these gearboxes have been in operation for almost 30 years before being rebuilt, with oil changes only when required by oil analysis.

Instruction

1. The gearbox manufacturer recommends a 40-micron filter, but we use a 20-micron filter. We previously tried a 10-micron filter but had problems with higher oil differential across the oil filter and were very close to bypassing.

2. We have an external lube system that oil filter prior to it reaching the bearings and gears. The system is a oil filter inside a canister, which is 12 inches in length. We are considering a larger filtering system to lower the oil differential because with the 20-micron filters.

3. Pulverizer gearboxes are very robust pieces of equipment, but they still benefit from additional filtration and having cleaner oil. From a design standpoint, if you would like to move to finer filtration without increasing the pressure differential across the filter to the point of bypass.

4. There are multiple ways to get more surface area. The most popular would be to add additional oil filter housings to the system parallel to the current housing. Another would be to simply procure a larger filter housing (if it fits the application). 

5. In addition, if it is possible to reduce the flow rate of the pump, finer filtration can be used without an increase in differential pressure.

If you are interested in our products, please feel free to contact WUZHOU KINGDA!