The urine pump suddenly stopped working
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Oh, that’s so frustrating. Yesterday we were in a meeting when the urine pump in the workshop suddenly stopped working. Later I checked the trends, and all the indicators were normal. Could it be caused by the imported filter screens? It turns out that when I arrived, the inlet filter of the urine pump was removed. The day before yesterday, the manager probably installed it in order to protect the granulator nozzles. I don’t quite agree. Generally, no filter is installed at the inlet of urine pumps. If it is to be installed, it should be at the exit. This was the case at all three factories I worked at.
Check if there’s a leak. Haha, guy, you must really want to be a leader at this moment! It doesn’t count just because someone says so ;P ;P ;P
Haha, guy, you must really want to be a leader at this moment! Words don’t count :)
Temporarily stop evaporation and check whether the inlet filter contains a lot of mechanical impurities. If there are many, it indicates that your judgment is correct; you can present the facts to your supervisor in detail, and I believe they will respect the facts. If it’s not much, then we need to look for other reasons.
It should be installed at the outlet; low inlet pressure can lead to clogging. :)
Is it a urine pump or a melting pump? If it is a urine pump, a filter should be installed. If the filter gets clogged and the pump stops working, clearing the filter will restore normal operation. If impurities reach the nozzle, it will result in poor-quality urea particles and excessive dust. When cleaning the nozzle, evaporation necessitates circulation or shutdown. Moreover, if the tiny holes in the nozzle get damaged, the nozzle is essentially unusable. A good nozzle isn’t cheap at all.
After parking, check that the filter is clean
It’s a urine pump; our melt pump is equipped with filters on both the inlet and outlet manifolds, which are more than sufficient to protect the nozzle
Unfortunately, adding water for import at that time was ineffective, and turning on the backup pump also didn’t work. But after running the loop and restarting, it’s fine now
Based on the above situation, it is likely that air has entered the pump body, or there is a leak causing this issue.
1. Pump cavitation 2. Clogged pump filter – these can be resolved one by one, with the approach to be determined based on your process
Is there any debris blocking inside the impeller? Is the impeller back cover loose?
It’s impossible; otherwise it wouldn’t be the case. “But after running in a loop, start it again, and that’s it.””
The low liquid level, combined with the additional filter at the inlet, increases the inlet resistance, resulting in pump cavitation.
May I ask the moderators: What is the mesh size of the filters installed on the urine pump inlet and the melt pump outlet main pipes?
Based on what you’ve described, it’s not a mechanical failure; it’s likely vaporization. The possible reasons are: 1. Low liquid level, 2. High level of free ammonia in the urine and high temperature
It might be that the filter at the inlet of the urine pump is clogged, or the inlet pipeline is deformed. In our factory, the urine pump stopped working; upon further inspection, it was found that the inlet pipeline had been flattened, and after replacing the pipeline, everything worked normally again.
It shouldn’t, as the previous production stage ensures stable operation under high load
How can the inlet pipe of the urine pump get flattened? ? ? ? ? The urine tank is connected to the drain tube, and it has a manhole on top; it is a device that operates at atmospheric pressure
I don’t know what kind of urea production process it is? Could it be that the steam pressure used for insulating the inlet pipeline of the urine pump is too high, resulting in air blockages in the pipeline or a high ammonia content in the urine?