Sulfuric Acid
Sulfuric Acid
(OP)
I am facing a big problem in our Alloy 20 piping in the sulfuric acid system ( 98%).
This is a new system commissioned few months ago , I am experiencing many leaks due to erosion . The max velocity as per design is 0.2 mt/sec. so what do you think is the problem
This is a new system commissioned few months ago , I am experiencing many leaks due to erosion . The max velocity as per design is 0.2 mt/sec. so what do you think is the problem
RE: Sulfuric Acid
RE: Sulfuric Acid
TTFN (ta ta for now)
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RE: Sulfuric Acid
What is the flowrate and diameter at the point of erosion ?
Please post Pictures of the point of erosion ? is erosion occuring just after a control valve ?
Was the piping hydrotested ?...... Was your piping positively identified ?
Substitutions of defective or inferior materials is a way of life in the third world ... especially for Alloy 20
Expensive, Alloy 20 is pretty good stuff .... if indeed that is what you have... Convince us
Alloy 20 (UNS N08020)is a chromium-iron-nickel-based, austenitic alloy that comes with excellent corrosion resistance in chemical environments. It contains sulfuric acid and many aggressive media well. The alloy is stabilized with niobium that helps it to resist intergranular corrosion. Alloy 20 can help provide potential cost savings compared to the higher nickel-based alloys as it outperforms standard stainless steel.
https://en.wikipedia.org/wiki/Alloy_20
You are not using that cheap-ass Schedule 5S piping from China, are you ?
Tell us more
MJCronin
Sr. Process Engineer
RE: Sulfuric Acid
Start by picking up a free copy of the Nickel Development Institute's publication on Sulphuric Acid.
Then follow mfgenggear's advice.
"Everyone is entitled to their own opinions, but they are not entitled to their own facts."
RE: Sulfuric Acid
Was everything clean and pickled to start with?
Had it been hydro tested with clean water and then quickly dried out?
There are a lot of ways to screw this up.
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P.E. Metallurgy, consulting work welcomed
RE: Sulfuric Acid
RE: Sulfuric Acid
RE: Sulfuric Acid
... or was "Alloy 20" hand written with Sharpe on the side of the piece ?
... No pictures, no more details, no more information ... just another Third World Scam ... Why do we bother ?
It has been two weeks, MKA4281 has given up on this thread and has gone on to harass others on eng-tips ....
MJCronin
Sr. Process Engineer