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#10
November 21st 03, 11:49 PM
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Rich
Said much better than I did. Tells it how it is. Big John On Fri, 21 Nov 2003 15:28:31 -0800, "Rich S." wrote: "Fred the Red Shirt" wrote in message . com... IIUC Scuba tanks are routinely filled while submerged in water for cooling purposes. In the examples I gave the vessels were pressure tested while FILLED with water so that there was no compressed air inside. In the scuba example the water ouside the pressure vessel provides (some I suppose) protection from the explosion should it fail. In the earlier examples, filling the pressure vessel with water prevents an explosion should the vessel fail. Just to be clear. Scuba tanks are filled with air while immersed for cooling and protection. They are also hydrostatically tested every five years, during which they are filled with water to mitigate expansion if they fail. Rich S. 
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