And what country can preserve its liberties if their rulers are not warned from time to time that their people preserve the spirit of resistance? Let them take arms. The remedy is to set them right as to facts, pardon and pacify them. What signify a few lives lost in a century or two? The tree of liberty must be refreshed from time to time with the blood of patriots and tyrants.
Someone in the coast guard explained this to me once. Let's see if I remember it correctly. Sea water acts as an electrolyte and the steel of the ship and the metal of the screw (bronze or aluminium alloy) are dis-similiar metals. The 'zincs' are sacrificial, they will corrode first instead of the expensive screw. Every x many months or years you send a diver down to inspect and replace the zincs as needed. Al_in_Ottawa
All flagged vessels come out of the water completely every 5 years to keep their ABS certification. A full shipyard lasts at least a couple of weeks, usually more like a month. These are usually pretty big work scopes. The sacrificial anodes are usually replaced on these intervals, and there may be statutory inspections involved that are in between the 5-year shipyards.
No screwing around there…
ReplyDeleteCommercial? 6 blades? Deep draft... Ok, what is this from?
ReplyDeleteCheck out all of the zinc anodes.
ReplyDeleteWhat do the horizontal pieces do? [assuming those are the "zinc anodes" . . . ]
ReplyDeleteSomeone in the coast guard explained this to me once. Let's see if I remember it correctly. Sea water acts as an electrolyte and the steel of the ship and the metal of the screw (bronze or aluminium alloy) are dis-similiar metals. The 'zincs' are sacrificial, they will corrode first instead of the expensive screw. Every x many months or years you send a diver down to inspect and replace the zincs as needed.
DeleteAl_in_Ottawa
All flagged vessels come out of the water completely every 5 years to keep their ABS certification. A full shipyard lasts at least a couple of weeks, usually more like a month. These are usually pretty big work scopes. The sacrificial anodes are usually replaced on these intervals, and there may be statutory inspections involved that are in between the 5-year shipyards.
DeleteSo this is “where the rubber meets the road?”
ReplyDeleteThe Captain is compensating for a small pee pee.
ReplyDeleteThe ship was in drydock a few months ago to have the blades panted in rainbow colors for gay pride month.....Hi there Sailor!
ReplyDelete