I would like to ask for methods to remove scale from the impeller of multi-stage water pumps!
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What are the methods for removing scale from the middle section, guide vanes, and impeller of multi-stage centrifugal water pumps used in mines?
Use a specialized cleaning agent in a circulation process – mainly acid!
There is another method; sandblasting is also a good option. It’s possible to get a sandblaster, which can also be used to clean other equipment.
Thank you for your advice. What is the optimal concentration for pickling?
For sandblasting and shot blasting, it is necessary to select the appropriate type of sand or shot based on the material of the part being processed.
For our internal coatings, we use sandblasting to remove rust and scale.
We have now tried the oxalic acid soaking method: mixing oxalic acid with water in a 1:2 ratio, sealing the inlet of the multi-stage centrifugal pump, then pouring the mixture in through the outlet. After 5–8 hours, it is rinsed with clean water, followed by disassembling the pump. It works fine; the main thing to pay attention to is the soaking time.
We have tried the oxalic acid soaking method again: we mixed oxalic acid with water in a 1:4 ratio, sealed the inlet of the multi-stage centrifugal pump, then poured the mixture in through the outlet. After 5–8 hours, we rinsed it with clean water, and subsequently disassembled the pump. This method is effective against scale buildup in multi-stage centrifugal pumps used in mines; it’s important to pay attention to the mixing ratio of oxalic acid and water as well as the soaking time. High concentration for a short time, low concentration for a long time.