×
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

CP for Copper Ground Grid

CP for Copper Ground Grid

CP for Copper Ground Grid

(OP)
Gentlemen,

As far as I understand (please correct me if I am wrong),
the protective levels required for the following underground structures protected by an Impressed current system are,
1) Steel  = -0.85 V dc
2) Copper = -0.20 V dc
with respect to a Cu/ CUSO4 half cell.

Now if we bond an underground copper ground grid to an underground steel line already protected by an impressed current system,definitely the electrical loading on the rectifier will increase.

Question: How can we resonably estimate the percentage increase in electrical loading on the existing impressed current system due to such type of bonding?

Kiri

RE: CP for Copper Ground Grid

By looking at Materials Performance, August 2002, pages 22 to 25

Steve Jones
Materials & Corrosion Engineer
http://www.pdo.co.om/pdo/

RE: CP for Copper Ground Grid

(OP)
SJones,

Thanks for the reply.

Since I am an electrical guy I donot subscribe to the the magazine you have mentioned. Could you please post the pages 22-25 in here in pdf to download?

Kiri

RE: CP for Copper Ground Grid

Kiri,

I have the pages but I'm pretty sure that copyright law will prevent me from posting them anywhere.  The essence of this paper is that, if one simply must incorporate copper earthing into a cathodically protected system, then one should really perform accurate earthing calculations to get the amount of copper down to the absolute bare (excuse the pun) minimum.  Even when that has been done, the author found the need to increase transformer/rectifier and groundbed capacity by 167% in that particular case.

Steve Jones
Materials & Corrosion Engineer
http://www.pdo.co.om/pdo/

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