[Milsurplus] DIY Vacuum Chamber

[Jim Whartenby]

When a pressure cooker is cooking, it has about 15psi on the inside pushing out.  When used as a vacuum chamber, the 15psi is on the outside pushing in.  Evidently, the aluminum container can't tell the difference!  <grin>Jim
Logic is a systematic method of coming to the wrong conclusion with confidence.  Murphy

On Monday, September 21, 2026 at 04:50:31 PM CDT, Facility 406 <facility_406 at bruteforcedevelopment.com> wrote:

On 9/21/2026 13:19, Jim Whartenby via Milsurplus wrote:
> One way to easily remove water vapor is with a vacuum.  One can easily 
> convert an old pressure cooker into a vacuum chamber for perhaps under 
> $30 if you already have a hobby compressor / vacuum pump.  The holes in 
> the cover are national pipe threads so just remove the old hardware and 
> substitute a vacuum gauge, ball valve and a tubing adaptor along with a 
> new gasket seal.  Plug any unneeded holes with the appropriate NPT 
> plug.  I use a small Gast air compressor / vacuum pump with good 
> results.  This example will hold a decent vacuum for well over a week.

I've thought of that in the past, but have been worried of the bottom 
imploding.

One idea I had was to bolt an Al plate to the bottom, something maybe 
3/8" thick.

Kurt

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