DNV RPB401

[godel123]

hi
is the DNV RPB401 recommended practice used for offshore only or also for onshore cathodic protection design?
I'm thinking about the Coating breakdown factor. Fc=a+b*t is there any sense to use it in underground structures evenly coated (bottom tank ).

 

[SJones]

This RP is primarily intended for CP of permanently installed offshore structures associated with the
production of oil and gas.

The breakdown factors won't really be applicable to a soil exposure or to welding a tank bottom after coating. Use them if you have to in the absence of anything else, or in case you dislike the factors in ISO 15589-1, and then make sure that the hardware has sufficient leeway in the current capacity to turn the rectifier up if needs be.

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.