What are those anodes for?
Well, I have a gut feeling from looking at them that they are to protect something BIG.
A rough calculation goes like this
100' steel hull boat will call for about 100# to 150# per year figuring about 2000 sq ft wetted area of painted steel. The duration of exposure is figured in the preferred thickness of the anode. The current required for protection is determined by the sq ft of wetted area (and other vaiables but we'll figure painted steel in saltwater) and figures into the total surface area preferred in the anode design.
In the anode assemblies in the fab shop we see what appears to be around 500# of zinc on each side for a total of 1000# (might be quite a bit more). The total surface area of the zinc anode is large compared to the "thickness" so the duration is on the short side (2 or 3 years) but the area (in sq ft of painted steel) to be protected is large.
My guess - I don't think they are related to the SAMs (besides the SAMs already have anodes visible). I think they might be anodes for oil rigs, either exterior or in ballast tanks.
Compared to some of the exotic custom hardware we have been seeing in the fab shop and assembly bay they would not be exciting or high dollar items if I am on the correct track. They would be another example of other oilfield items that add to the "one-stop shopping" ststus of DDI.
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