Re: [PSUBS-MAILIST] Questions, questions and more questions

[Gregc02@ibm.net]

Well if the weather got so extreme as to lose ALL of the worlds atmosphere to outer space and 
you were now in a vacuum, you'd show about a 33 ft depth change. The little 1 inch pressure 
changes (out of a 29.92 inch atmosphere) the weather does wouldn't amount to more that a foot 
or two of variation. A regular pressure gauge will work just fine (about .44 lbs of pressure per foot 
of sea water) but most gauges will show relative pressure, so that if you equalize your boat to 
sea pressure, your gauge will now read zero. The ones on my old diesel boat were just plain old 
guages, calibrated in ft instead of psi. We had the BIG shallow guages for precision at periscope 
depth and down to about 150 ft and when we went deeper we just shut the stops for the shallow 
guages and ran on the one small deep guage that was set up for 600 ft. (we never went any 
deeper than about 400 ft.) 
Here's my old boat:

http://www.usstorsk.org/torsk.htm

I don't know if this system supports pictures but I'll try. If it soesn't, look at the control room 
pictures in the photo album (last set there, of decommisssioning; ones I shot those many years 
ago. That's me, now, in the last picture.
Also, I any of you want to work on a full size boat, we could use the help in Baltimore on the 
next work weekend in OCT...the dates are 20-22 Oct. We're trying to get it back in some sort of 
condition; unfortunately not possible to get it in seaworthy shape. We do have berthing space on 
the boat or on the USS Taney.

Greg



   
> That system will measure the pressure, but pressure will change depending on 
> what is going on. (although there is the question of how much does the 
> pressure change with the weather?)
> 
> Anthony


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