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Re: Question
Well, I don't think I will be able to afford to fabricate a whole hull test chamber. but I was going to build a test fixture to test windows, through hull seals, and relese mechinisims.
I know about the testing with water trick :) And I have a 3000psi source of air. ( I play paintball and deal wiht really high pressures on a regular basis ) Also I have highly accurate regulators to do the testing with. I too was only planning on a 100foot maximum depth. that's MORE than I will ever need, I know I'm not going out into really heavy water, the biggest waves I would have to deal with is 12-15 feet. so that still leaves me at 80 feet withought going beyond operating depth.
You mention home compressors only going to 160psi, heck that's still 350feet :) Truthfully I think the one in the garage is set to turn off at 80-100psi. But the works for me.
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On 8/9/99, at 3:57 PM, Paul Suds wrote:
>Thousand's of pound per square inch or thousands of pounds... Ahhh, that is
>the question. Yes at 400 ft, you're looking at ~ 170 psig. However, I don't
>have my trusty slide rule, but I'd estimate around 25,000 lbs per square
>foot!! Big difference, no?? Yes, I've built test chambers. I used a very
>large pressure cooker one time, and it was great for vacumm degasifying
>resin, but when I put pressure to it, it deformed on me very well; Yes, very
>well indeed. I still can't get the top off of it, ha. Aluminum is funny that
>way. If it's not the right alloy, it can pose a serious problem. I've since
>limited my maximum depths to around 50 psi. This allows me to use various
>pressure tanks rated for that range. I've been working on a hydraulic test
>chamber for a while now, it is a lot safer than air, if a leak occurs, since
>the expansion of the liquid is minimal during a leak. The damage to your
>equipment, test rig, and anything that surrounds it (you) is minimal. It's
>kind of on aback burner however, since I'm limiting depth to 100 ft.
>How big of a chamber do you intend on building?? Be very carefull. Typical
>home compressor units only go to 160 psi. Examine one of these tanks. Any
>larger, and the thickness of the steel wall goes up by the X power (?). I'd
>have to get my statics book out to see what the relationship is, I'm sure
>someone on here knows. Just be carefull.
>Use liquid, it's safer, and you can drink it when you're done (UGH)!!!
>Paul
>
>
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