×
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

Corrosion in Underground fire mains

Corrosion in Underground fire mains

Corrosion in Underground fire mains

(OP)
Recently came across high corrosion in an underground fire ring main of MS construction(no coating) that runs on top of a mains electrical cable feeding the site.My understanding is that stray currents caused by a DC field can cause corrosion in pipe lines.Can an AC field cause corrosion in pipe lines?

RE: Corrosion in Underground fire mains

In a word, yes.

http://webcache.googleusercontent.com/search?q=cache:1M8cjcg41r0J:www.clihouston.com/news/ac-induced-corrosion-on-onshore-pipelines-part-2.html+ac+line+pipe+corrosion&cd=2&hl=en&ct=clnk&gl=us

"You see, wire telegraph is like a very long cat. You pull his tail in New York and his head is meowing in Los Angeles. Do you understand this? Radio operates the same way: You send signals here, they receive them there. The only difference is there is no cat." A. Einstein  

RE: Corrosion in Underground fire mains

any stray currents can cause accelerated corrosion.
These should be treated like natural gas lines, OD coatings and cathodic protection.

= = = = = = = = = = = = = = = = = = = =
Plymouth Tube

RE: Corrosion in Underground fire mains

Unless your pipe is way out in the middle of nowhere, you can assume there will be some stray current.   

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