Is the pump shaft corroded?
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Is the pump shaft corroded? The pump conveying medium is water (80%), dimethyl ether (20%), the medium temperature is about 40°C, and the inlet pressure: 1.5MPa, outlet pressure: 2.9MPa, pump shaft material 3Cr13.
Dimethyl ether is not corrosive to 3Cr13, and water is not corrosive to 3Cr13. Check to see if there are other components in the medium, or if it reacts with something after leakage, the products will corrode it.
It seems to be corroded. The medium is water (80%) and dimethyl ether (20%). It should not be corrosive. There may be corrosion caused by other ingredients.
It feels like cavitation. Could it be that the medium at your location is throttling?
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Is there a problem with the seal? The pump shaft cannot contact the medium. If possible, please send me a picture of the seal.
Do you have a photo of the impeller? Does it vibrate a lot? Is the inlet pressure normal? like cavitation