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Wastewater Treatment Cast Iron Pump Problem
3

Wastewater Treatment Cast Iron Pump Problem

Wastewater Treatment Cast Iron Pump Problem

(OP)
Our wastewater treatment center provides treatment to all plant runnoff.  We are a soda bottling plant where the runoff is dilute soda (ph-3.8-5.0), line lube, sugar water, sanitation caustic, facultative anaerobes aka natural flora, small fragments of plastic aluminum wood. They are centrifigual pumps with a SS impelar and cast iron housing.   We have had two pumps go out that are 2 years old.  On both pumps the cast iron housings have been corroded away while the SS impelar is fine.  My question is with such acidic solution (ph-3.8-5.0; temp - 50-70 F) should the pump housing been made out of SS?

RE: Wastewater Treatment Cast Iron Pump Problem

You may have answered your own question, if the St Steel Impeller is fine, ten i would say yes, go for a St Steel casing also !!  You will find that the cost difference in this day and age is not as big as it was a few years ago, and most chemical pump companies use St Steel as a base material now.

Hope this helps

RE: Wastewater Treatment Cast Iron Pump Problem

I can't understand why the cost of a SS impeller was put in an iron case in the first place.

Charlie
www.facsco.com

RE: Wastewater Treatment Cast Iron Pump Problem

FACS (Mechanical)
CI/SS is a fairly normal fitout for small process pumps.

scottyspi (Industrial
As pointed out by pumpking- you have answered your own question - use all SS

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