Seeking help with a compressor temperature issue
Thread Content
This post was last edited by zhaoming4865 on 2010-12-14 at 14:45. The compressor is an Ingersoll Rand screw compressor, model probably R110IU-7.5. My questions are: 1. What temperature should be displayed on the machine’s LCD screen under “Compressor Status”? Is it the temperature of the air discharged or the temperature of the lubricating oil? If it’s the temperature of the discharged air, then why isn’t the oil temperature monitored? 2. Besides when the oil usage time has expired, under what other circumstances must the compressor lubricant be replaced? Please, teachers, answer the above questions. Thank you! !
I don’t know much about screw compressors. However, parameters such as medium temperature, shaft temperature, and oil temperature must be monitored, as these are closely related to the operation of the unit; any abnormalities indicate that there may be a fault in the unit ； 2. We determine whether to replace the lubricant based on the monthly lubricant analysis reports. The parameters we analyze in the lubricant include moisture, contaminants, flash point, etc.
Reply to 1# zhaoming4865 regarding question 1: Personally, I think it should be the exhaust air temperature, as this parameter is quite crucial. The oil temperature is monitored; the fact that it isn’t displayed on your LCD screen doesn’t mean that monitoring isn’t taking place. Oil temperature is also an important parameter for the unit, and there is a thermometer on site – its value must be recorded as part of the unit’s operation logs. Answer to Question 2: It is necessary to replace the lubricant when it deteriorates or becomes emulsified.
I think it’s also the exhaust temperature; generally, compressors have a temperature overload protection that triggers an automatic shutdown. A low or high oil temperature only results in an alarm, but such a mechanism should still be in place. It might be displayed on the on-site gauge, and the temperature control is usually related to the bearing shells. Regarding oil replacement, see what the person upstairs says: handshake
We use Atlas screw air compressors, and the display shows the outlet temperature; I assume yours does the same. We replace the compressor oil once a year.
Regardless of the type of engine, the decision to replace the lubricating oil is made by analyzing the test results of various parameters to determine whether they are within the specified ranges
We also use an instrument air compressor, and the temperature that is monitored is the exhaust temperature of the unit, which has not been cooled by oil. It is generally 83°C. For lubricating oil, the amount is also determined based on operating time; the information provided with the unit explains this. However, our control panel frequently triggers an alarm indicating a high pressure difference in the oil filter, and the new lubricant turns black after not long. The new oil filter won’t last long either. I was wondering if anyone has any good suggestions regarding the maintenance of the oil system?
Reply to 7# sean816: High oil filter pressure difference alarm: It is likely caused by impurities in the oil pipeline. The lubricant turned black after a short time: 1 Besides quality issues with the lubricant itself. Two people believe that it is mainly caused by residues resulting from the wear of the cylinder packing seal leaking into the middle section of the cylinder; these residues then, along with the oil scraped by the wiper ring, flow back to the crankcase oil tank and enter the oil supply system.
Generally, the return oil temperature, shaft temperature, and inlet oil temperature all need to be measured! As for oil change, large-scale machinery systems have regulations regarding the management of lubricating oil; it is necessary to regularly analyze the oil for impurities, acidity, viscosity, and flash point. It depends on the specific circumstances.
The oil temperature definitely needs to be measured; it’s not indicated on the control panel, so it might be in another place. Oil should be replaced when it deteriorates or becomes emulsified, and when buying oil one should also be careful as some oil is actually old oil that has been reprocessed!