Hi, John,
In absolute pressure terms, yes, but since the inside of the boat is also subject to the 14.7 psi the pressure you'd be measuring is the delta, or around a pound and a half.
Bob
On Sun, Sep 14, 2008 at 9:32 AM, John Stevenson < ([email][/email])> wrote:
Wouldn't the pressure have to include atmospheric pressure on the water surface for a total of around 16 psi at the through-hull?
John
On Sun, Sep 14, 2008 at 9:22 AM, Robert Fine < ([email][/email])> wrote:
Yes. It's easy. Water in a column provides about .49 pounds per square inch. That means for every 2 feet or so, it's a pound (close enough). At three feet, you could say, then, it's 1.5 psi static pressure (dynamic is not taken into account here). It's also the reason that water pressure at 33 feet is twice atmospheric (about 14.7 x 2). This is close enough for government work. If you're building something that will only withstand 2 psi, I'd make it stronger.
You could look up the exact conversion, but half a pound per foot is pretty close.
Bob
On Sun, Sep 14, 2008 at 8:54 AM, Silver Heels < ([email][/email])> wrote:
Does anyone know, or know how to figure out, the mean (psi) pressure of seawater 3' below the surface? In
other words, what is the pressure on a hose connected to a thru-hull 3' below the waterline?Tor
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Bob Fine
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