Selection of chilled water (ethylene glycol aqueous solution) circulation pump
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The ethylene glycol aqueous solution has a density of around 1.09, and its operating temperature ranges from -15°C to 10°C. Currently, a direct-connected horizontal centrifugal pump is being used; the motor bearings frequently make abnormal noises and get damaged. Is this a problem related to the pump selection or an issue with the way the pump is operated? Could the experts give some advice?
When selecting a centrifugal pump, was the impact of low temperatures on the pump and seals taken into consideration?
The current during operation should be measured first. Usually, this phenomenon is caused by motor overload.
If there is abnormal noise in the motor bearings, the issue lies with the motor itself. Try using a motor from another brand.
The motor’s rated current is 34.3, and the meter reads between 35 and 37 – isn’t the overage that significant? Is this overload very impactful?
The rated current refers to the current at a voltage of 380V; however, such a voltage doesn’t exist these days. The voltage in our factory is rarely below 400V.
How about trying a different motor? (Engineering plastic pumps, ceramic pumps www.yxcrbf.com)
I plan to just replace it with a larger pump, but I haven’t found the reason for the problem, so I’m a bit unsure. Does anyone have any suggestions regarding pump replacement?