On 1/27/2010 4:38 PM, Randall wrote:
>> Concaved also distributes forces, outward toward the rim.
>>
> Yes, but the rim is the weak spot. Note on the Mythbusters video how the
> end plate is intact, but separated at the corner between it and the walls.
> The best shape for a pressure vessel is a sphere.
>
Agreed, but a water heater isn't supposed to pressurized to failure,
just moderate pressure. Enough pressure that a flat bottom would deform
and pull away from the sidewalls. So making the bottom concaved, like
an aerosol can, means it will hold its general shape and stand, under
designed pressure.
Peter T.
> -- Randall
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