The pump shaft sleeve made of engineering plastic is severely damaged
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The purification unit uses 8 engineering plastic pumps, three of which are out of use due to a lack of spare parts； Of the 4 pumps that are currently in operation, two of their shaft sleeves (made of silicon nitride) have been damaged, and they are still in use despite this issue ； It is preliminarily assumed that the damage is related to a sudden power outage, but the pumps in the secondary washing tower were not damaged; both of them are in good condition (it is likely related to the low temperature of the liquid) ； Please ask the relevant technical personnel for advice and analyze the cause of the damage ； Are there better materials for the shaft seals of engineering plastic pumps? Please recommend.
Our family also uses silicon nitride; it used to break down frequently for a while, but now it breaks down rarely once proper care is taken during installation.
Another reason is that during use, slight acid leakage occurred, and the mechanic tightened the shaft sleeve privately, which led to the malfunction；
1 Non-metallic pumps may offer more reliable performance at low flow rates, while their performance is relatively poorer at high flow rates. 2 is closely related to the medium being transported; highly acidic media require higher standards for shaft seals. 3. There is a lack of experience in usage; everyone should communicate more, as only by exposing problems can they be solved.
After replacing the shaft sleeve, it operates smoothly, returning to the condition of a new device
Our company manufactures pump valves with a steel lining covered in fluoroplastic; the shaft sleeves used in these products are made of 45# steel lined with fluoroplastic. Such pumps offer stable performance and are durable. The flow rate can reach up to 400 cubic meters, with a head of 50 meters
Well, there is innovation; I’m not sure about its lifespan. I’ll get in touch later!
Shaft sleeves with steel lining and fluoroplastic will not be better than those made of silicon nitride! The tendency of silicon nitride bushings to break is indeed related to the temperature of the medium; high temperatures cause the shaft to expand, leading to cracks in the bushings. If the operating conditions permit, you can use a sealed assembly with a cooling water device.