[permaculture] Ferrocement water tank pix

David david at h4c.org
Wed Dec 19 16:42:14 EST 2007


Charles,

Charles de Matas wrote:
> David wrote:<<<<<<<<<<<<<<<<<<<<<<<<<<<<
> Diameter is not a consideration with regard to hydrostatic pressure,  only depth.>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> 
>  
> I know that.  But I wasn't referring to hydrostatic pressure, I was refering to the hoop stress produced in the walls of the tank by the hydrostatic pressure. It's the product of the hydrostatic pressure and the tank diameter.
> I hope nobody thinks that he or she can build a 30 m. dia tank with the same wall thickness as a 3 m. dia tank.
>   
Sorry if my reply was not clear. We're both right, just talking about 
slightly different things.

Your point rendered mathematically? See 
http://www.oasisdesign.net/water/storage/extras/TankCalculator.xls

d.

-- 
David William House
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	503-206-1001 (cell)

	"The Complete Biogas Handbook" www.completebiogas.com

	"Make no search for water.   But find thirst,
	And water from the very ground will burst."
	   (Rumi, a Persian mystic poet, quoted in Delight of Hearts, p. 77)




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