Seeking help: My company’s electric desalination feed water pump has a short service life for the seal rings at both ends; I hope experts can assist me
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Our company has an electric desalination injection pump; the model of this pump is DG25-50*4, and it was manufactured by Guangzhou Baiyun Pump Industry. The bearings at both ends are of the UN series, and there are no thrust bearings – the axial force is balanced entirely by the balance disc. The medium used is water, and the temperature reaches 130 degrees. The service life of the seal is extremely short: initially, the seal can last around 2 months, but after that, within another month, and then within just over 10 days, each time the seal is removed, it is found that its sealing surfaces have been severely worn – the stationary ring has deep grooves of about 1 mm deep, while the rotating ring has been worn by approximately 2 mm. The balance disc is worn by 1 mm, so there should be no problem. All of the mechanical seals that were replaced were worn to such an extent that leakage occurred due to the lack of sufficient compression capacity. The compression amount will never exceed 3 mm. After running for 2 minutes after this seal replacement, the static ring of the non-drive end seal had already worn out; grooves could be felt by hand. It’s really hard to understand pumps of this type – the service life of the same seals keeps getting shorter with each use.
Is there anyone who is familiar with the pumps produced by Guangzhou Baiyun Pump Industry? Please help
Does water at 130 degrees not vaporize? That sealed dry grinding is also unbearable. I suggest you lower the water temperature.
For high-temperature operating conditions, Plan23 is recommended. It would be best to provide information on the medium pressure, whether there are particles or impurities present, and to share a diagram of the sealing structure for review.
For high-temperature liquid conditions, a different flushing scheme should be considered. Additionally, factors such as the purity of the medium, the shape of the powder, and its particle size must also be taken into consideration.
Personal suggestion: The issue of high pump flow rate still needs to be addressed; thrust bearings should be added to the bearings
Is it an installation issue? Is the original seal made of graphite against an alloy?
Yes, it’s a large spring; at that time, a small spring was used temporarily due to limited time