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Old 12th October 2011, 10:40 PM   #1
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Default Stackability of shipping containers...?

There is a container-ship in trouble off the NZ coast and it has at least seven layers of containers stacked vertically on its deck. I have occasionally wondered just how many of these boxes can be safely stacked? I understand that these are filled i.e. heavier than empty ones. Totally trivial I know. Just curious. Anyone got any idea?

Jonathan
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Old 12th October 2011, 11:31 PM   #2
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specified on the container. Depends on the weight (full or empty). Google "Intermodal Container"
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Old 12th October 2011, 11:41 PM   #3
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Used to be 7 full, 9 empty for a TEU.
(not sure how many empties are allowed to be stacked in the latest generation containerships)
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Old 12th October 2011, 11:52 PM   #4
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Thanks Guys: appreciated.
Jonathan
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Old 13th October 2011, 12:03 AM   #5
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No problem.

The number depends on the weight, (wind) gale force and rolling of the vessel, it's basically the twist locks that determine the max stack number.
Later generation container vessels have cell guide rails sticking out above the deck, translates to a higher location twist lock which encounters the highest load. (the 9 empty is for restricted areas/conditions)

Sea containers can be stacked higher on land (no movement, you know), up to 12 high.
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Old 13th October 2011, 11:21 AM   #6
DF96 is offline DF96  England
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Quote:
Sea containers can be stacked higher on land (no movement, you know)
Some people in Japan and Christchurch might beg to differ!

The thing about container ships which looks strange to me is that they seem very top-heavy. I assume there is a lot of concrete (or depleted uranium?) in the keel.
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Old 13th October 2011, 11:32 AM   #7
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Fuel (HFO) or ballast water.
Stability of container vessels is not such an issue (due to weight), a loaded TEU still is relatively light at <30lbs/ft3
Stacking them in an optimal sequence/spread, and keep in line with stability criteria, is trickier. (couple of my class mates graduated on development of container loading/unloading software)
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Old 13th October 2011, 01:05 PM   #8
DF96 is offline DF96  England
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Yes, of course, I forgot about ballast water. That is what propagates alien marine species around the world into new ecosystems where they have no predators. After all, water is just water, isn't it?
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Old 14th October 2011, 01:33 AM   #9
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now that's what I call stackablility....
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Old 18th October 2011, 04:48 PM   #10
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Quote:
Originally Posted by PeteMcK View Post
now that's what I call stackablility....
I like your sig, one of my favourite quotes is also water/fish related:

"I don't drink water, fishes F$%K in it" Oscar Wilde, when asked if he wanted water in his whisky
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