Condensate pump
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How long does the mechanical seal of a condensate pump generally last? The mechanical seal of our condensate pump breaks down frequently; the water temperature is around 90 degrees. Sometimes it’s the sealing ring that fails, and other times it’s the sealing surface. I’ve used both silicone and fluorocarbon sealing rings; the material used for the mechanical seal is SiC. Could it be that this material isn’t suitable? Pumps made by Dalian Ernai should work fine. For some reason, this pump has really driven me crazy
The key issue is whether your pump is suitable for the operating conditions at the site; you should check the instructions regarding factors such as the allowable temperature and impurity content. Furthermore, there may be issues with the original service life of this pump; if that is the case, it is necessary to examine the pump selection process from a design perspective. If problems arise the day after, the cause should be sought in the quality of maintenance work – for example, whether the rough surfaces resulting from damage to the original shaft surfaces were not repaired, the condition of the surfaces where the mechanical seal is fixed, and the choice of material for the mechanical seal, among other factors. In particular, the amount of impurities present in the material, along with the unprocessed rough surface resulting from damage to the shaft surface, make leakage the most likely cause of damage.
Control the quality of condensate water! Buy pumps of good quality!
It is highly recommended to consider cavitation as the cause.
It is paired with graphite and silicon carbide to improve the heat exchanger and reduce the temperature of the flushing fluid; water above 80 degrees has very poor lubricity
Oh, the water quality issue… There shouldn’t be any problems with the steam condensate. Large particles can’t get in either thanks to the filter valve, so we’ll check the wear on the pump shaft during the maintenance
I’m using an open-type circulating water seal flusher; the water is drained after flushing, and the flow rate is quite high. So it shouldn’t be that the problem lies in this aspect, right?
Are you using the 54 scheme with double sealing? Why is it okay to discharge directly, when the pressure of the return water needs to be higher than that in the sealing chamber?
The stationary ring is prone to opening under reverse pressure, and it is also easy to be pushed out
Oh, then which flushing regimen is more suitable? There’s a problem with this design
Ensure that the pressure of the return water is higher than the pressure in the sealing chamber; the pressure in the sealing chamber of this pump is generally the inlet pressure plus 0.25 times the pressure difference between the inlet and outlet