(This should be in the Naval Architecture and Ship Design forum, but a forum glitch prevents me from looking at that page while signed in, so I'll put my question here instead. Sorry for any inconvenience.)

I am doing a research project where I need to know the maximum capacity of all ballast tanks on a cargo ship, proportional to the ship size, for a number of different ship types (bulk carriers, tankers, general cargo, container ships, etc). Is this different depending on ship type? Is there somewhere I can look up the information? I assume it must be broadly basic information that a ship design engineer would have on hand...