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You could also use a barometer, like Alec uses in Snoopy. Another option could be the low range pressure gages used in some hyperbaric chambers. But you would have to make sure they can handle being is side the hull. They might have water or oil filled ones that will work. Also I was thinking that a good manual or digital SCUBA depth gage might do the trick, and they can obviously handle the external pressure. Your resident possibility thinker ;)' Regards, Szybowski From: ShellyDalg@aol.com Date: Fri, 29 Aug 2008 13:21:02 -0400 Subject: Re: [PSUBS-MAILIST] Dome Calculations To: personal_submersibles@psubs.org On Cabin Pressure.......a simple manometer attached to the inside will tell
you exactly what the internal pressure is. It's basically just a clear plastic
tube in a "U" shape, with one end plugged, and some red oil in the bottom. If
the internal cabin pressure changes, it shows up as a difference in the oil
level from one side to the other. I've used these for years in air conditioning
work, and they are simple and trouble free.
If you get a pressure build up in the cabin, I'm
guessing that a small automotive compressor on 12 volts would be able to remove
enough extra air and pump it into a small tank, until you get back to the
surface, where you open the hatch and just dump the air. The small compressors
can pump up to 250 pounds, although they are pretty slow as the pressure builds
past 40 pounds or so. Still, if you have a big pressure build-up, something's
wrong! and you need to get to the top quickly anyway. Just remember to keep the
hatch dogs locked down. Frank D. It's only a deal if it's where you want to go. Find your travel deal here. |