NaOH and carbon steel
NaOH and carbon steel
(OP)
I have an application where I have a pump moving NaOH from a storage tank into one of our systems. The pump is designed for this type of application and comes with a plastic pipe.
However, we have to move the liquid about 20' and cannot use the plastic tube. We would like to use plain old carbon steel, is this going to be a problem? This system might be a bit above room temperature at it's maximum.
I'm told the NaOH will be about 0.5mol/L. Is there a point where the concentration will be too high or is that not a concern?
I checked one of my texts from school and that says carbon steel should be fine.
However, we have to move the liquid about 20' and cannot use the plastic tube. We would like to use plain old carbon steel, is this going to be a problem? This system might be a bit above room temperature at it's maximum.
I'm told the NaOH will be about 0.5mol/L. Is there a point where the concentration will be too high or is that not a concern?
I checked one of my texts from school and that says carbon steel should be fine.
RE: NaOH and carbon steel
<<A good friend will bail you out of jail, but a true friend
will be sitting beside you saying ” Damn that was fun!” - Unknown>>
RE: NaOH and carbon steel
RE: NaOH and carbon steel
Unfortunately my applications have not run long enough for us to be able to determine if any damage has been done to the piping. I know we made a trick out of pump impellers, but it might have been unrelated to the pH. I am still investigating.
<<A good friend will bail you out of jail, but a true friend
will be sitting beside you saying ” Damn that was fun!” - Unknown>>
RE: NaOH and carbon steel
RE: NaOH and carbon steel
" Corrosion in Caustic Solutions
Corrosion by caustic (sodium or potassium hydroxide) at all concentrations is easily handled at room temperature with a variety of metals and alloys, including carbon steels. It becomes increasingly more corrosive with increasing temperature and concentration. The useful safe limit of carbon steel is approximately 150oF/65oC, both with regard to caustic stress corrosion cracking (CSCC) and corrosion. Stainless steels are more resistant to general corrosion compared with carbon steel; however, they can suffer CSCC at approximately 250oF/121oC. "
http://www.hghouston.com/naoh.html
hope this help
S
Corrosion Protection & Corrosion Control
RE: NaOH and carbon steel
Avoiding Caustic Stress Corrosion Cracking of Carbon Steel Refinery Equipment and Piping
http://www
S
Corrosion Protection & Corrosion Control
RE: NaOH and carbon steel