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
> -- Randall
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