Issues with starting the negative pressure pump?
Thread Content
The falling film system operates under negative pressure, and the discharge pump is a magnetic pump. Every time it is started, the pump fails to deliver fluid due to improper filling, and this has also caused damage to the silicon carbide shaft sleeves of the pump on several occasions. Does anyone have any good methods for starting this pump? We usually keep the inlet open and the outlet closed; after starting the pump, we open the outlet, but still, the flow rate doesn’t increase many times
If the medium does not crystallize, close the pump inlet and outlet before stopping the pump; open the inlet valve before starting the pump. After starting the pump, check the pressure gauge – if the outlet pressure rises immediately, gradually open the outlet. If the outlet pressure does not rise or fluctuates significantly, it indicates that the pump has not been filled properly, and the pump should be stopped immediately! If that doesn’t work, add a self-priming tank; after starting the pump, slightly open the outlet valve, and then increase it to the rated pressure once pressure builds up! I hope my personal opinions can help you! Communicate more if there are any issues – let’s improve together!
This method works, but the material tends to crystallize easily
The opening is blocked, so nothing can get in anymore; negative pressure pump
The reason for this problem is that the height of the tower is not sufficient to counteract the negative pressure. Since it’s not possible to increase the height of the tower, could the pump be used at a lower height instead? Can magnetic pumps use graphite bearings? Can the vacuum level in the front tower be reduced before starting the pump? Let me get a little creative! This problem is really hard to solve! If it’s resolved, could you post a reply so we can learn from it too?
Example: 1. Application of M120D antimony-doped graphite in propane pumps. The 150YZC magnetically driven propane booster pump, developed by Lanzhou Refining and Chemical Industry Complex, has a completely sealed rotor section, meaning its bearings cannot be lubricated with lubricant. The use of M120D antimony-doped graphite as bearings enables operation without lubricant and provides good wear resistance, meeting the special requirements of magnetic drive pumps. I searched on Baidu, and it turned out to be useful! There’s another method, suggested in a WeChat group – it’s also great; see the image above
If you don’t understand, add me on WeChat to communicate further. I will share everything I know without reservation! Hope this helps!
Thank you; this return line should be fine. You can give it a try during the next maintenance session