[PSUBS-MAILIST] Pressure Test Chamber

[james cottrell via Personal_Submersibles]

Alan,
The danger is actually twofold- One is O2 pp as Hugh said, but the other is that gases (like air) air compressible. They store up lots of energy that is released violently if there is a rupture. That's why hydro testing of scuba tanks is done with the tanks filled with water in a chamber filled with water. Even with water it is still dangerous. A well known submarine building company in Florida once had a test chamber blow and it took out the rear corner of their cinderblock building.
Greg

      From: Alan via Personal_Submersibles <personal_submersibles at psubs.org>
 To: Personal Submersibles General Discussion <personal_submersibles at psubs.org> 
 Sent: Wednesday, June 21, 2017 1:59 AM
 Subject: Re: [PSUBS-MAILIST] Pressure Test Chamber
   
Thanks Greg & Hugh,there was a bit of doubt in my mind about it so mentioned myintended process. I have just googled accumulators in hydraulic systems& the danger of high pressure air! Yikes just as well I've got you guyslooking out for me.What about air from the scuba tank pressurising water?I can get all the air out of the test chamber apart from the air inthe line pressurising it!Other than that I have done some previous tests with the water blaster& may have to suffice with it's pressure!Cheers Alan

Sent from my iPad
On 21/06/2017, at 3:33 PM, james cottrell via Personal_Submersibles <personal_submersibles at psubs.org> wrote:


Alan,
Pressure testing that high needs to be done with liquid not gas. High pressure air is VERY dangerous. A pressure washer pump using water would be a safer choice.
Greg

      From: Alan via Personal_Submersibles <personal_submersibles at psubs.org>
 To: personal_submersibles at psubs.org 
 Sent: Tuesday, June 20, 2017 9:01 PM
 Subject: [PSUBS-MAILIST] Pressure Test Chamber
  
I am making a plastic container to fill with water & stand inside my
pressure chamber. There is a gap between the wall of the container
& the chamber which I intend to fill with oil. There will be about an
inch of air at the top of the chamber & I'm using a scuba tank to
pressurise the unit up to 3000psi.
Will car engine oil do to fill the gap between my plastic container &
the chamber wall, or do I need to go with a hydraulic fluid.
Am using the plastic container to keep water from rusting my test
chamber. (Aussie Steve's idea)
Cheers Alan

Sent from my iPad
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