I would interpret tIbuy'choHmoH fill them as meaning to load torpedoes into the tubes.
If the intent is to flood them with water, why not use the word SoD flood instead?


As for the actual question, I think you could conjoin the labeling numbers that way, but I would probably be more clear with DuS wa' DuS cha' je. Or, if the situation called for clipped speech, I might just say wa' cha' je SoD!
If you really want to phrase it the way you put it, I suggest making the plural torpedo tubes explicit: DuSmey wa' cha' je...

-- ghunchu'wI'