Cathodic Protection seashore
Cathodic Protection seashore
(OP)
Here is my issued:
I would like to know what is the right measurement value with reference electrode for a pipeline (pipe, api 5l grade b), please see attached image in order to watch the location. the value that has been taking the techinician is -200 mv, but I think that is not the right value for carbon steel (-850mv) in orden to protect the pipe that have a Zinck epoxy primer and polyurethane finish.
what are the recomensations. what other factor you recommended to me, there is a standard that tells me something about it. It is possible that reference electrode shows a wrong measurement due to sand o salinity.
please help.
I would like to know what is the right measurement value with reference electrode for a pipeline (pipe, api 5l grade b), please see attached image in order to watch the location. the value that has been taking the techinician is -200 mv, but I think that is not the right value for carbon steel (-850mv) in orden to protect the pipe that have a Zinck epoxy primer and polyurethane finish.
what are the recomensations. what other factor you recommended to me, there is a standard that tells me something about it. It is possible that reference electrode shows a wrong measurement due to sand o salinity.
please help.





RE: Cathodic Protection seashore
Steve Jones
Corrosion Management Consultant
http://www.linkedin.com/pub/8/83b/b04
All answers are personal opinions only and are in no way connected with any employer.
RE: Cathodic Protection seashore
Are there isolation joints?
Have you tried a different portable reference electrode?
You are correct in -200mv is not sufficient to have have effective CP.
There are many types of coatings so "polyurethane finish" is very vague. Thickness, application?
If you're asking for a code reference for a CP system tells me you're not a CP engineer. first find the design calculations and design documentation on the CP system and then see if it was all installed...
Remember - More details = better answers
Also: If you get a response it's polite to respond to it.