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Re: [PSUBS-MAILIST] Rainy day work

 
The number of sacrificial anodes usually gets calculated for the purpose of having enough to last the "in service life" of a structure. For a P-subber on the other hand, changing the anodes should be quite easy if they deteriorate completely. Your concern about blind spots are a bit more complicated. However it can be measured by taking CP readings when you are submerged. Use several smaller anodes than just a few "big" anodes. Spread them out evenly and don't forget inside confined spaces. Also have in mind, during production, the possibility for crevice corrosion. Small spaces with little or no water circulation. Corrosion of this type is associated with crevices in order of 25 to 100 micro meter wide and commonly involves the chloride ions in the electrolyte.
 
There is also ICC Impressed Current Cathodic protection systems out there. Good luck
 
Øystein
 


 
On Jan 27, 2008 6:53 PM, <ShellyDalg@aol.com> wrote:
Thanks for the info on nickel. Because I'll be in salt water mostly, that is a real concern. I'm investigating sacrificial anodes and what locations would work the best. Frank D.



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Best Regards
Øystein Skarholm
www.ubat.no
+47 92 40 53 72