Comparison of two pumps
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One is running normally under the same conditions and working conditions, but the other is steel-lined with PTFE and has great noise and vibration during operation. I don’t know why. Please give me some advice. Thank you\ud83d\ude4f13780003913
The flow rates and rotation speeds of the two pumps are different, and the NPSH is different. How much traffic do you actually use?
There is no problem with the metal pump, but the fluorine-lined pump makes a lot of noise and vibrates a lot.
There is no flow meter, it is just a material circulation pump installed at the bottom of the heater.
Isn’t that what I’m talking about? A pump with a high speed has a large cavitation margin.
There is a big difference in the rated flow and power of the two pumps. I suspect that the actual flow rate is closer to the 240 of the metal pump, and the PTFE pump with a flow rate of 150 should be running at a large flow, so the vibration is large. Furthermore, the cavitation margin of the PTFE pump is 6 meters, and it is easy to cavitate at large flow rates.
I feel that the pump size is too small, the speed is high, and cavitation is serious.
The head is marked the same, but after the production process is completed, the test run may not be the same, which is a recipe for disaster!
How is the installation condition, such as whether it is well aligned with the motor, whether the anchor bolts are loose, etc.
The cavitation allowance of the second pump must be too large, causing the medium to cavitate in the pump! Either lower the height of the pump, or add an inducer to the inlet!