Quote:
Originally Posted by Torpex752
US Subs had what was called a clean fuel oil tank, and in fact even modern submarines have a similar setup with diesel on top and seawater on bottom. No high tech gizmo here just a simple seperator tank. So, not blasting you, but there is more than one reference in the books about this fuel/ballast tank. It did exist and was used for fuel & once empty, ballast tank.
Frank "Torpex" Kulick
Subsim Staff 
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Amazing... although it makes sense because the oil would 'float' above the seawater. I guess they pull the fuel off the top of the tank.
Probably have some damn good fuel/water seperators. I can imagine that in rough conditions the two might mix up to some degree.
I can see filling the 'empty' tank with sea water to keep things balanced too makes sense.