is it always a day, thiel? because looking at the plans of the 1947 destroyers, I cannot believe that propels them a full day (on cruising speed it might be enough, but then it is the definition how that day is spend
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Depends on who is certifying the ship. As I recall the DNV requires that tankers have enough fuel ready on hand, ie centrifuged and heated, for 24 hours at Best Speed. Exactly what Best Speed is depends on the ship, but as I understand it it's the speed that'll give you the most range for the least fuel within 24 hours. But that's only the DNV definition and I'm not sure it's the same anything else except tankers. Other certification houses probably have a different one.
Really, Day Tank is a purely civillian term that has snuck its way over to the military side. Despite what they call them they're really just ready tanks. Anyway, the defining feature of both is that whatever is in them is ready for immediate use. If it needs to be heated then it's kept hot, if it needs filtering then it's been through a filter and so on.
As an interesting aside the Royal Danish Navy used to define a Ready Tank as a tank that held enough conditioned fuel to get the boilers to working pressure from a cold start. Of course that definition became rather obsolete when they started to use diesel engines and gas turbines in ernest.
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