Cathodic Protection(DNV vs NACE)
Cathodic Protection(DNV vs NACE)
(OP)
Hi, Has somebody done the CP calcs per both DNV-RP-B401 and NACE-SP0607?
I am wondering why the results are soooo different per these codes. For the same surface area DNV comes up with waaaay higher number for anodes comparing to NACE. (i.e. per DNV B401 you need 13 of 150lb anodes but per NACE you just need 2).
I digged more into the detail, and figured out this wide gap btwn the results is comming from big differences between these codes on the coating breakdown factors. NACE0607 Coating breakdown factors are way lower than DNV, and the final result is so sensetive to those factors.
Can somebody shed more light on this issue, and help me understand why these two codes are so different (conceptually)? I can't understand the concept behind "coating breakdown factors", and the concept behind this big gap.
I appreciate the time and energy you gonna spend to educate me.
Victor
I am wondering why the results are soooo different per these codes. For the same surface area DNV comes up with waaaay higher number for anodes comparing to NACE. (i.e. per DNV B401 you need 13 of 150lb anodes but per NACE you just need 2).
I digged more into the detail, and figured out this wide gap btwn the results is comming from big differences between these codes on the coating breakdown factors. NACE0607 Coating breakdown factors are way lower than DNV, and the final result is so sensetive to those factors.
Can somebody shed more light on this issue, and help me understand why these two codes are so different (conceptually)? I can't understand the concept behind "coating breakdown factors", and the concept behind this big gap.
I appreciate the time and energy you gonna spend to educate me.
Victor
RE: Cathodic Protection(DNV vs NACE)
Independent events are seldomly independent.
RE: Cathodic Protection(DNV vs NACE)
Coating breakdown is usually a historical based figure and maybe dnv is just using either data from the North Sea where conditions are a bit rougher or just a bit out of date.
My motto: Learn something new every day
Also: There's usually a good reason why everyone does it that way
RE: Cathodic Protection(DNV vs NACE)
http://www.ptil.no/getfile.php/Tilsyn%20p%C3%A5%20...
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(DNV vs NACE)
RE: Cathodic Protection(DNV vs NACE)
RE: Cathodic Protection(DNV vs NACE)
Victor