[PSUBS-MAILIST] Pressure Test Chamber

[Alan via Personal_Submersibles]

Thanks Steve.
I am getting nervous now. Think I'll keep the scuba tanks for diving
& just fill with water & pressurise from a pump.
Alan

Sent from my iPad

> On 21/06/2017, at 7:40 PM, Stephen Fordyce via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
> 
> Hi Hugh & Alan,
> Good point to consider, but it would depend on the flashpoint of the oil.  SCUBA compressors do the exact combination of pressure/air/oil and don't explode.  Diesel engines do too - sort of, anyway.  Mineral oil designed for compressors would be a good option although pricey (AU$200 for 20L recently). Shell Corena P150 mineral oil is what I use.
> 
> High pressure air is a mechanical hazard to be considered in and of itself.  I'd highly recommend installing a relief valve (or device) on any test chamber or other vessel.
> 
> Cheers,
> Steve
> 
>> On Wed, Jun 21, 2017 at 2:28 PM, Hugh Fulton via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
>> Alan,
>> 
>> Never pressurise oil with air to those pressures.  An explosion waiting to happen.  Oxygen partial pressures!!
>> 
>> If you want to do it use nitrogen.
>> 
>> Hugh
>> 
>>  
>> 
>> From: Personal_Submersibles [mailto:personal_submersibles-bounces at psubs.org] On Behalf Of james cottrell via Personal_Submersibles
>> Sent: Wednesday, 21 June 2017 3:34 PM
>> To: Personal Submersibles General Discussion
>> Subject: Re: [PSUBS-MAILIST] Pressure Test Chamber
>> 
>>  
>> 
>> 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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