shielded pump
Thread Content
In the distillation unit, since the two existing flow pumps for benzene reflux could not meet the requirements, an additional large shielded pump was installed. Once it was turned on, the flow rate was normal, the temperature on the balance line was normal, and the rotation speed of the bearing detector was normal. The only issue was that the temperature at the motor end was abnormally high; the temperature of the medium was around 40 degrees. Will prolonged operation damage the shielding sleeve? Where exactly is the problem? I’m hoping experts can give some advice; I’ll try running it again tomorrow, using toluene as the medium. Thank you!
No jacket? Our medium temperature is 200++; using a jacket with water for cooling has always worked fine
Are your pumps vertical shielded pumps or horizontal ones? Do you mean the pump body of the shielded pump when you talk about the motor side? For a regular vertical pump, check whether the circulation line from the top to the outlet valve is unobstructed; as long as the vibration meter readings of Imperium Pumping are within normal ranges, there should be no problems. The temperature of the pump body can be measured; if it’s hot to the touch, it’s usually around 50 degrees
Without a jacket. The temperature of the medium here isn’t very high; it’s mainly used for benzene processing, and it has good sealing properties
First is the horizontal pump, manufactured in Dalian. The previous two smaller pumps were from Shanghai Hitachi. The temperatures at the impeller, that is, at the pump’s inlet and outlet, are normal; however, the pump body itself is very hot. Since the temperature gun is broken, it’s not possible to obtain accurate readings, but it definitely feels above 50 degrees when touched by hand. The pump was vented several times, and after running for an hour, no abnormal noises were heard. Both the maintenance and electrical staff said that the temperature was too high, so the pump was switched back off. Additionally, this larger pump has a head of only 70 meters, while the two smaller pumps have a head of 78 meters. In order to increase the flow rate, we plan to switch to this new larger pump. What concerns us now is that the high temperature might damage the coils
Is the pump body cooled using a fluid, and are the pipelines unobstructed?
Your description is inaccurate: how high can the temperature at the motor end reach when the pump is in operation? Is the temperature stable? Under normal circumstances, as long as it is below 90 degrees and stable, there is no problem. Focus point: Overloading the pump can easily cause the motor temperature to rise. Try reducing the outlet valve to see if the motor temperature drops; if it doesn’t, it means the pump is not overloaded. Otherwise, it is the pump overload that is causing the problem ； You can also inquire with the manufacturer about the operating temperature of the motor.
I have a canned motor pump installed, and the motor temperature remains stable at over 80 degrees – no problems.
You don’t even consider the requirements of the task – since the flow meter shows that the flow rate is normal, won’t this pump also overheat if it cannot reach its minimum flow rate?
Well, I’ll just wait for the manufacturer. I thought I could rule out some possibilities from certain aspects