Acid Resistance of Cast Iron
Acid Resistance of Cast Iron
(OP)
Hi, i'm new to this forum. need help...
We are unable to run our Sewage Treatment Plan Lifting Station at the moment due to high salinity/acidity content of water. (ie. Water TDS (total dissolved solids) = 5000ppm due to groundwater seepage).
We are afraid that pump impeller (cast iron) will not resist too high acid water content. (damaging impellers too quickly)
Any suggestions? (we are trying to lower TDS of water to 2,000ppm)
Thank you.
We are unable to run our Sewage Treatment Plan Lifting Station at the moment due to high salinity/acidity content of water. (ie. Water TDS (total dissolved solids) = 5000ppm due to groundwater seepage).
We are afraid that pump impeller (cast iron) will not resist too high acid water content. (damaging impellers too quickly)
Any suggestions? (we are trying to lower TDS of water to 2,000ppm)
Thank you.





RE: Acid Resistance of Cast Iron
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"The richer we have become materially, the poorer we have become morally and spiritually." Martin Luther King Jr
RE: Acid Resistance of Cast Iron
RE: Acid Resistance of Cast Iron
The only problem with using rubber coating is if there is H2S present (often is in sewage) then it will likely attack the rubber.
This would not preclude the use of a different coating.
There are many epoxy based coating systems. While they are more susceptible to impact damage than rubber is they have much better chemical resistance. If you go this route get references from the coater and call them to ask how it has held up. You are always better off coating the parts prior to any exposure.
Surface preparation is 99% of a coating job.
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RE: Acid Resistance of Cast Iron
RE: Acid Resistance of Cast Iron
@ swall, We have not obtain pH value. We concentrated on the TDS level only.
At the moment, we are trying to locate the source of seepage in the network and apply chemical blasting method to seal it.
Any opinion?
RE: Acid Resistance of Cast Iron
RE: Acid Resistance of Cast Iron
Reducing TDS will not guarantee you of increase in pH.
RE: Acid Resistance of Cast Iron
RE: Acid Resistance of Cast Iron
Supposedly, some jurisdictions like to have the sewage flow to be a bit on the alkaline side
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RE: Acid Resistance of Cast Iron
_____________________________________
"The richer we have become materially, the poorer we have become morally and spiritually." Martin Luther King Jr
RE: Acid Resistance of Cast Iron