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In a container ship the hatch openings are quite big with only a marginal distance on main deck of about 1.5 ft between the hatch opening and the shide shell. This is done so as to maximise the space for stowing containers as they cant be stowed correctly once inside the hold which is not the case with bulk carriers.
Now, the ship is always in motion which leads to a racking effect as well as a diagonal movement which produces a torsion on the main deck. Since the breadth of the main deck plating in way of the hatch openings is less, there is seriuos concentration of stresses there which cause cracking of the deck plating.
In order to prevent the material failure, torsion boxes are fitted with welded joints on the side shell as well as on the deck plating which prevent the torsion produced by twisting.
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What is the function of Torsion box in container ship?
It is the twistiing of something
What is airlock in container ship?
There is under deck passage on container ships named torsion box. Air lock is provided in that place only. As one of the entry to this torsion box is from Engine room and for dangerous goods there are some designated cargo holds on container ships (Usually located from extreme forward hold to hold no 3 or 4 - depends upon total number of holds on that ships) . Now these air locks are provided to prevent any flow of the dangerous gas from designated cargo holds to the Engine room via torsion box. there is a forced draft system in air lock space so that no gas should enter in that space.
What is torsion box?
"Torsion Box" is a neologism which occurs most frequently in amateur woodworking circles and is gradually replacing the older terms: "box beam" and "stressed skin construction".
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