vinhermes
Marine/Ocean
- Aug 29, 2009
- 36
Good day gents,
I have been looking through various threads but can not find an answer to my query.
I am trying to determine the required zinc anodes on a galvanised steel seawater piping inside a ship. It does not need to be a very refined calculation as I am only looking at a ball park estimate. For this, I am using the DNV-RP-B401 methodology that is straightforward. My only concern is the mean current density assumed. It is averaged for the temperature of interest at 0.1 A/m². I am surprised that the flow velocity is not accounted for (in my case from 1.5 to 3 m/s). Only publications I can find for pipelines are for the external protection. I am interested in the internal cathodic protection.
Any feedback on this figure or alternative references would be appreciated. Thanks, Vincent
I have been looking through various threads but can not find an answer to my query.
I am trying to determine the required zinc anodes on a galvanised steel seawater piping inside a ship. It does not need to be a very refined calculation as I am only looking at a ball park estimate. For this, I am using the DNV-RP-B401 methodology that is straightforward. My only concern is the mean current density assumed. It is averaged for the temperature of interest at 0.1 A/m². I am surprised that the flow velocity is not accounted for (in my case from 1.5 to 3 m/s). Only publications I can find for pipelines are for the external protection. I am interested in the internal cathodic protection.
Any feedback on this figure or alternative references would be appreciated. Thanks, Vincent