Cathodic Pretection Criteria for burried pipelines
Cathodic Pretection Criteria for burried pipelines
(OP)
The criteria for the protection of a buried ferrous structure is to maintain a potential on all parts of the structure equal to, or more negative than, -850 mV with respect to a saturated copper/copper sulfate reference electrode.Further we limit the off potentials to -1150 mV to avoid the hydrogen evolution which will have direct impact on the coating of pipelines. As our pipeline is over 40 years old and with tape coating we are having few issues relates to maintaining the right potentials. Some areas of the pipeline we have to go as high as -1450mV On potentials to get the adequate off potentials to protect the pipeline. As the On potential is not considered a valid indicator of hydrogen evolution, is there a limit to ON potential? Any stress on the coating due to the On potential as well? Your feed back is higly appreciated.





RE: Cathodic Pretection Criteria for burried pipelines
Here are my two cents, suggesting to you to read these documents:
http://www.bushman.cc/pdf/corrosion_theory.pdf and http://www.usbr.gov/power/data/fist/fist2_8/vol2-8...
For the second one, the Chapter 8.
El que no puede andar, se sienta.
RE: Cathodic Pretection Criteria for burried pipelines
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 Pretection Criteria for burried pipelines
Happy new year to all.
The articles which I read so far are not directly addressing my point relates to the "ON" potentials. Can someone forward me the details directly adressing my point?
Many thanks in advance.
RE: Cathodic Pretection Criteria for burried pipelines
RE: Cathodic Pretection Criteria for burried pipelines
RE: Cathodic Pretection Criteria for burried pipelines