Pump Impeller

[Giray Veli]

Hi everyone, we are using this pump to transfer sulphuric acid. Our concentration is %85 and this impeller MOC is PVDF. This impeller got some damage but we don’t know the reason. There is no particule on fluid it is clean and closed system. I have faced this problem 3 times and I want to know reason to solve problem. I have calculated the NPSHa and it is almost 6m, NPSHr is 3m hence there is no cavitation. What can be the reason could u help me?

 

[Giray Veli]

20Cb3 and CW12MW should be available.
Just make sure that the castings have been annealed and come with corrosion test certification.
I would be surprised if you cannot find Furan also.

I can provide 20Cb3 but Teflon coated impeller is easy to provide for me. Thank you for your kindly reply.

 

[TenPenny]

As a former Goulds rep, I'd go with the 3298, which has a Tefzel impeller, I don't recall any customers having issues with sulfuric acid with these pumps, pretty sure we sold 25 to 50 of them. So Teflon / Tefzel would be my go-to, whatever brand you use.