[PSUBS-MAILIST] Pressure Test Chamber

[Stephen Fordyce via Personal_Submersibles]

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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