Although this stuff deals only marginally with blackpowder I thought some of you smoke and fire fans would be interested, so...
Our loading dock is currently cluttered with 3 skids of powder tanks which once held 3 powder bags each for the 16-inch guns on the IOWA class battleships. The tanks are aluminum, date from ca. WWII, are about 5' long and 2' in diameter. The lid has rotary bayonet lugs and can be removed with the tool shown in the brief slideshow, which tool I DO NOT HAVE, unfortunately (if you just happen to have a case of those wrenches, please consider sharing!) Yes the lids can be pounded off with a sledgehammer and wood drifts, but using the wrench is a heckofa lot easier. Guess I'll just have to find the proper cog, if MSC has one that will fit, and build wrench around it. The wrench is about 14 in. long and 6 in. tall, referencing the photo in the slideshow.
Blackpowder: The "ignition pad" on the end of the inert powder bag shown once held 350 grams of black powder. The primer, somewhat like a .45-70 blank cartridge, would have been inserted in the firing lock on the rear of the huge breechplug. It was fired electrically, at which point flame and hot metal blew through a hole in the breechplug and obturating mushroom, onto the ignition pad, which by design should have been no more than 4 inches from the mushroom when loading was complete.
http://s17.photobucket.com/user/cannonmn/slideshow/miscforumsetc/forums64/Battleship%20Ammo%2016%20inch%20items