Continue to Site

Eng-Tips is the largest engineering community on the Internet

Intelligent Work Forums for Engineering Professionals

Register Log in
  • Congratulations waross on being selected by the Eng-Tips community for having the most helpful posts in the forums last week. Way to Go!

SS Steel Corrosion 5

Status
Not open for further replies.
Merc-

Merc-

Mechanical
Sep 21, 2021
12
Hi all,

Is there any solution for corrosion in SDS pipes and SDS pump casings other than pickling and passivation?
 
Replies continue below

Recommended for you

Sort by date Sort by votes
We need more information than that.
What is the service, materials, type of corrosion.
Help us out here.

= = = = = = = = = = = = = = = = = = = =
P.E. Metallurgy, consulting work welcomed
 
Upvote 0 Downvote
SDS - Safety Data Sheet, of course! (Answer may be influenced by one of my current work assignments...)
 
Upvote 0 Downvote

Pardon me. I was referring to Super Duplex Steel.
 
Upvote 0 Downvote
Service: Filtered sea water
Material: Super Duplex Stainless Steel
Affected Equipment: 1. Pump casings(material EN 1.4469 (similar to ASTM A890 Grade 5A))
2. Interconnecting Piping( Super Duplex and SS 316)
Type: Seams like localized pitting corrosion in case of pumps. In pipes pitting is observed especially in HAZ.
Attached file contains photos for reference.
 
 https://files.engineering.com/getfile.aspx?folder=d0726edd-9793-4435-84ed-dfac4995510f&file=Process_Piping.pdf
Upvote 0 Downvote

We do that one better... MSDS; now, I know what you're talking about.[ponder]

Rather than think climate change and the corona virus as science, think of it as the wrath of God. Feel any better?

-Dik
 
Upvote 0 Downvote
Were the pump casting tested per ASTM A923?
It may be something, or it may be nothing.
Those are all external, where they see deposits of salt on the surface.
If they were ever handled or touched with steel tools then I would expect to see rust spots everywhere.
And the 316 is hopeless, it will not tolerate seawater, period.
Do you have leaks?
Have you opened anything up to see if this is more than cosmetic?

= = = = = = = = = = = = = = = = = = = =
P.E. Metallurgy, consulting work welcomed
 
Upvote 0 Downvote
You guys are way ahead of me; I'm still trying to work out what SS Steel' refers to [hourglass]

"Everyone is entitled to their own opinions, but they are not entitled to their own facts."
 
Upvote 0 Downvote
Would be ideal if one of the corroded sections from either the pipe or casing could be removed and evaluated in a metals laboratory to determine corrosion mode and likely cause. I sometimes have been given samples that appeared to have scattered pitting corrosion that turned out to instead have occurred from a different mechanism (these have included stress corrosion cracking and MIC, but I really don't want to put speculative ideas out there as this could be something else altogether).
 
Upvote 0 Downvote
Appears to me as if the pipe sections were laid on and dragged across a steel bed of sorts as well as cross contamination from buffing/grinding/cutting discs. Weld spatter as well would easily cause some of those marks. Some sections appear to be more corroded than others so it's likely old material that's been sitting around or was just mishandled was used.
 
Upvote 0 Downvote
Thanks, David...

Rather than think climate change and the corona virus as science, think of it as the wrath of God. Feel any better?

-Dik
 
Upvote 0 Downvote
Status
Not open for further replies.

Similar threads

Josef M.
  • Locked
  • Question
Corrosion on Stainless steel instalation 1
Replies
15
Views
2K
EdStainless
EdStainless
Zahib
  • Locked
  • Question
SS cladding with Galvanic corrosion issues 2
Replies
2
Views
596
EdStainless
EdStainless
M. BR
  • Question
Corrosion inside a tube
Replies
1
Views
2K
Magcargo
M
nyfi
  • Question
Senior corrosion technologist. 2
Replies
4
Views
3K
nyfi
nyfi
nabeel3
  • Question
What type of Corrosion 1
2
Replies
25
Views
13K
mfgenggear
mfgenggear

Part and Inventory Search

Sponsor

Back
Top Bottom