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Sulfuric Acid Material 3
- Thread starter Valving
- Start date
EdStainless
Materials
80% acid is very difficult to handle, alloys like B-2 and B-3 may be the only real options.
You need to know all of the impurities before you select a material, oxidizing species are an issue (Cu, Fe, NO, Cl..)
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P.E. Metallurgy, Plymouth Tube
You need to know all of the impurities before you select a material, oxidizing species are an issue (Cu, Fe, NO, Cl..)
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P.E. Metallurgy, Plymouth Tube
EdStainless
Materials
See if you can find a copy of MTI MS-1 on Concentrated Sulfuric Acid. This a very complete reference on the subject and it was updated a few years ago.
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P.E. Metallurgy, Plymouth Tube
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P.E. Metallurgy, Plymouth Tube
moltenmetal
Chemical
With dilute acid at conditions which are not very hot, stay the hell away from metals and choose plastic materials, as linings if you're worried about mechanical damage or pressures are high. Corrosion immunity is far better than mere corrosion resistance!
EdStainless
Materials
MM, yes us metal guys tend to think that way don't we?
I wouldn't want to use rubber at this temp but there are plenty of resin systems that would work well.
For this they would use a special glass, structural resin, and (maybe) apply a liner of a different resin.
Google "FRP sulfuric acid"
composites-cis.com/materials/en/15.pd
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P.E. Metallurgy, Plymouth Tube
I wouldn't want to use rubber at this temp but there are plenty of resin systems that would work well.
For this they would use a special glass, structural resin, and (maybe) apply a liner of a different resin.
Google "FRP sulfuric acid"
composites-cis.com/materials/en/15.pd
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P.E. Metallurgy, Plymouth Tube
moltenmetal
Chemical
The point here is that an alloy which works at 80% might not work at 70% and might fail rapidly at 60 or 50%- and the plastics will just yawn and laugh off that difference!
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1
- #10
pradipgoswami
Materials
Hasteloys are excellent alloys but may be rank expensive.Compered to that Alloy-20(20Cb-3)are more easily available and may be less expensive alloys.Another proprietary alloy, Zecor-Z is also very popular in the sulfuric acid industry, though being proprietary customers could also be at the receiving ends.
It may be worthwhile to know what're the components involved.
Here're some links which might be useful.
Thanks.
ZeCor -Z alloy: pdfs/PAPER_5D_GRUBB.pdf
Pradip Goswami,P.Eng.IWE
Welding & Metallurgical Specialist
Ontario,Canada.
ca.linkedin.com/pub/pradip-goswami/5/985/299
All provided answer are personal opinions or personal judgements only. It's not connected with any employers by any means.
It may be worthwhile to know what're the components involved.
Here're some links which might be useful.
Thanks.
ZeCor -Z alloy: pdfs/PAPER_5D_GRUBB.pdf
Pradip Goswami,P.Eng.IWE
Welding & Metallurgical Specialist
Ontario,Canada.
ca.linkedin.com/pub/pradip-goswami/5/985/299
All provided answer are personal opinions or personal judgements only. It's not connected with any employers by any means.
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1
- #11
EdStainless
Materials
Zecor and SX (both proprietary) are versions of A610/A611 high silicon austenitic stainless steels. I wouldn't use any of these at 80%, that is way too low for them.
The problem with almost all of these alloys that have been batted about is that their useful concentration range is limited. They will either go to hell at 70%, or at 90%. The exception is B-3, but the cost is steep.
I guess that the question that comes to mind is why do you have 80% acid (sounds odd), and can it ever be more concentrated, or less concentrated?
Look at FRP.
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P.E. Metallurgy, Plymouth Tube
The problem with almost all of these alloys that have been batted about is that their useful concentration range is limited. They will either go to hell at 70%, or at 90%. The exception is B-3, but the cost is steep.
I guess that the question that comes to mind is why do you have 80% acid (sounds odd), and can it ever be more concentrated, or less concentrated?
Look at FRP.
= = = = = = = = = = = = = = = = = = = =
P.E. Metallurgy, Plymouth Tube
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1
- Thread starter
- #12
Thanks to all input. This is regarding valve material selection.
I searched many literature and websites and have a great database.
Mostly it looks like Alloy20 would be fine. Pls. check the best doc I could find
from carpenter.
However I do agree the concern for higher and lower figures of
% and temp.
I have asked to a few foundries and valve producers
having experience in corrosion field.
If we go to plastic materials, do you recommend FRP?
PVC or others?
Thanks for time and discussion.
I searched many literature and websites and have a great database.
Mostly it looks like Alloy20 would be fine. Pls. check the best doc I could find
from carpenter.
However I do agree the concern for higher and lower figures of
% and temp.
I have asked to a few foundries and valve producers
having experience in corrosion field.
If we go to plastic materials, do you recommend FRP?
PVC or others?
Thanks for time and discussion.
EdStainless
Materials
I suggest looking for other iso-corrosion diagrams. That one look a bit too optimistic for my taste.
You need to consider who welds and casting will perform, not just mill annealed and pickled plate.
The FRPs are mad with various epoxy resins. I believe that Ashland chemical has some very good references.
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P.E. Metallurgy, Plymouth Tube
You need to consider who welds and casting will perform, not just mill annealed and pickled plate.
The FRPs are mad with various epoxy resins. I believe that Ashland chemical has some very good references.
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P.E. Metallurgy, Plymouth Tube
moltenmetal
Chemical
Small sizes: solid thermopolymer valves. Larger sizes: butterfly valves with non-metallic internal construction and Hastelloy C stems, or all-lined plug valves from Durco, Xomox etc. I have no experience with FRP valves.
EdStainless
Materials
Often pumps and valves of larger sizes are made from high Si cast iron, but I don't know if it would work in this lower concentration acid.
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P.E. Metallurgy, Plymouth Tube
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P.E. Metallurgy, Plymouth Tube
The reference to ATI's Dr. John Grubb's paper by pradipgoswami provides excellent information on High Si alloy behavior in sulfuric acid. The Zecor-Z looks as though it would work.
EdStainless
Materials
Zecor and SX can only be purchased by the people that own the rights to them.
They are not generally available. I have made Zecor tubing in the past.
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P.E. Metallurgy, Plymouth Tube
They are not generally available. I have made Zecor tubing in the past.
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P.E. Metallurgy, Plymouth Tube
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