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Barrel Design


Mark Chapman

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Talking to a wood worker last night, the question came up why are barrels still curved.

They are no longer rolled anywhere.

The certainly could be banded other ways (rather than driving bands on).

A lot of wood is consumed (wasted) making traditional barrels.

The curved design demands a high skill level in manufacture to not leak.

Is this simply another tradition?

Mark Chapman

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They're also much stronger.

The joints between the tapered staves work the same as the keystone in an arch, except that with the barrels, every stave is a keystone. With the constant tension exerted by each of the bent staves, which are forced into place with a winch, every stave is essentially clamped into place by its two neighbors.

A barrel with straight sides only has the tension of the hoops to hold the staves in place.

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They're also much stronger.

The joints between the tapered staves work the same as the keystone in an arch, except that with the barrels, every stave is a keystone. With the constant tension exerted by each of the bent staves, which are forced into place with a winch, every stave is essentially clamped into place by its two neighbors.

A barrel with straight sides only has the tension of the hoops to hold the staves in place.

Think of taking a straight barrel and putting downward force on it. Slightest side motion will cause it to collapse. That's why eggs aren't straight sided, and PETA would probably have a problem with how bad it would hurt a chicken to lay one.

The sides being curved also add to the strength when on it's side. Just as the keystone you mentioned. Barrells laying flat will collapse if not filled with product, once you reach a certain height.

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Think of taking a straight barrel and putting downward force on it. Slightest side motion will cause it to collapse. That's why eggs aren't straight sided, and PETA would probably have a problem with how bad it would hurt a chicken to lay one.

The sides being curved also add to the strength when on it's side. Just as the keystone you mentioned. Barrells laying flat will collapse if not filled with product, once you reach a certain height.

True!

Love the egg analogy

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