Over-temperature issue in screw compressors
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Our company’s 2 Atlas G250-8.5 compressors have been running at elevated temperatures since the end of last year; the temperature during afternoons now exceeds 100 degrees. However, this device is set to trigger an alarm at 100 degrees and shut down at 110 degrees. The manufacturer’s after-sales staff were also unable to determine a specific cause; they simply said it was related to the external temperature, with the machine’s temperature being equal to the external temperature plus 60 degrees. The maximum temperature in the server room is just over 30 degrees, so it shouldn’t exceed 100 degrees either. We regularly clean the radiators, so they’re not very dirty. Later, the manufacturer’s staff said that the temperature difference between the inlet and outlet of the oil cooler was not large, around 10 degrees; it should normally be around 18 degrees, which indicates that the cooling effect is poor. Another detail is that the exhaust opening of the machine is about 1 square meter, while the finished air duct has a cross-sectional area of over 3 square meters; the speed at which hot air is expelled is not high. Is this related to it? :(Please, fellow sailors, feel free to share your advice.) :handshake
Is it the bearing temperature or the outlet medium temperature?
We have also encountered similar problems with the instrument air compressor here; you can check whether the temperature control valve is faulty. If the temperature control valve is fine, open the cover around the compressor to allow ventilation.
Judging from the description, it seems to be closely related to the oil cooler; poor oil cooling can also lead to high exhaust temperatures. There is a possibility of short-circuiting in the air flow for intake and exhaust within the oil cooling system, which means that the oil cooler ends up drawing in the hot exhaust air again, resulting in poor cooling efficiency
The poster is referring to the exhaust temperature, right? The exhaust temperature is directly related to the intake temperature and the compression ratio.
We also use Atlas air compressors, radiators, and oil systems, which need to be cleaned regularly on an annual basis~!
It’s probably the oil cooler that’s problematic; give it a clean to see if that helps
If the oil-cooling system is equipped with a temperature control valve, it is recommended to check whether too much hot oil is flowing through it. If there are no issues, then examine the oil and water circuits to see if there are any blockages~~
It’s not the exhaust temperature, it’s the temperature of the compressor head