Centrifugal pumps generally use 32 or 46 grade engine oil to lubricate the bearings
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Centrifugal pumps generally use 32 or 46 grade engine oil to lubricate their bearings, but on the bearing housings of some manufacturers’ pumps, it is specified that \"oil should not be added\" – adding oil in such cases can cause leakage. Are these pumps lubricated with grease, requiring no maintenance or oiling? For comparison, what are the differences between pumps that require refueling and those that don’t, and which one is better?
The ones that don’t require refueling are lubricated with maintenance-free grease
Benefits of using lubricant: 1. With the same bearing configuration, it allows for a higher maximum rotational speed and better load-bearing capacity； 2. In environments with acid mist or under conditions of severe corrosion, the balls will not corrode, as the oil film provides protection for the bearings ； 3. Bearings that are lubricated have a longer lifespan than those that are not lubricated. Disadvantages of the fuel injector: It has two skeleton oil seals at the front and back, which can lead to oil leakage. Although the probability is low, it does happen from time to time. Although oil leakage isn’t a major issue, it doesn’t look good at the scene.
This post was last edited by 3983596_FPPZ on 2020-8-18 at 15:20. Bearing housings come in two types: those using lubricating oil and those using grease. The design of those using lubricating oil is relatively more complex, but they provide better lubrication and cooling effects; however, they require more frequent maintenance on the part of the user. Generally, engine oil with viscosity grades of 32, 46, or 68 is used, depending on the local temperature. There is no such thing as a maintenance-free bearing housing that uses lubricating oil； Grease has a simple structure, but its lubricating effect is somewhat poor; it requires little maintenance. It is generally used in low-speed pumps. Only bearing housings filled with grease can be considered maintenance-free. Such rolling bearings contain a predetermined amount of grease inside them, which is used once, and the bearings need to be replaced when their useful life is exhausted. The poster doesn’t need to worry about which one is better; those that can be used with pumps have been proven to be reliable, so they can be used with confidence. Just follow the instructions, and if there are any problems, contact the manufacturer for help.
Under strict adherence to the equipment operating procedures, understand its working principle and lubrication principles. Not all the lubricants used are the same either. For reference.
Check the pump’s manual for the requirements regarding lubricant; for ordinary centrifugal pumps, grade 46 lubricant is sufficient
We have used maintenance-free bearings, and the advantage is their high machining precision; there are no other benefits. It has a longer lubrication life compared to ordinary bearings