[PSUBS-MAILIST] Pressure Test Chamber

[Alan via Personal_Submersibles]

Greg,
I was trying to limit the air in the chamber, & would have had about
an inch at the top. But now I'll keep right away from it. 
Cheers Alan


Sent from my iPad

> On 21/06/2017, at 10:22 PM, james cottrell via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
> 
> 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 my
> intended process. I have just googled accumulators in hydraulic systems
> & the danger of high pressure air! Yikes just as well I've got you guys
> looking 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 in
> the 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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