×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

316 SS - CORROSION in Stagnant Ground Water

316 SS - CORROSION in Stagnant Ground Water

316 SS - CORROSION in Stagnant Ground Water

(OP)
Is 316 SS, susceptible to pitting/crevice corrosion in stagnant groundwater at less than 30 deg C. with chloride in the range of 2000 ppm.  Also possibility of  MIC (SRB) corrosion in swampy.

RE: 316 SS - CORROSION in Stagnant Ground Water

I think MIC will be your worst enemy based on my experience.

You will eventually get pitting at the ground air interface. From what I've seen pitting isn't really a big problem as the pits are very shallow. The only thing you will notice is the pipe will be a little rusty.  

RE: 316 SS - CORROSION in Stagnant Ground Water

a "safe" limit of chloride concentration for SS 316 in water is set to approx 1000-2000 ppm. This limit is a function of several factors like:
-possibility of crevice conditions
-possibility of evaporation and concentration of chlorides
-condition of the exposure, fluid velocity; stagnant water will cause the steel to become active if no oxygen will reach the steel surface
-composition of the weater and possibility of MIC
-temperature..

In my opinion in your conditions you'll have the possibility of either pitting and crevice.
The acceptable limit of chloride is also a function of the criticality of your service.

Stainless Steel Corrosion

GUIDELINES FOR SELECTION OF NICKEL STAINLESS STEELS FOR MARINE ENVIRONMENTS, NATURAL WATERS AND BRINES (1987) (pub. 1987)
http://www.enia.org/index.cfm/ci_id/15786/la_id/1/ci_doc_id/3277/search_keyword/metal/method/.html


S.

Metal Corrosion
 

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources