Thank you for the chart. I know this is way overkill, but for arguments sake.. even with a pump like this I couldn't pull lower than 25.4 at my elevation?
Its 5.6 CFM and pulls down to 0.3 microns vs my current pump that is 3 cfm and pulls down to 100 microns
https://www.bestvaluevacs.com/pro-series-5-6cfm-corrosion-resistant-two-stage-vacuum-pump.html
You can only remove what is there, but consider that Mother Nature has already removed the rest at 5400 ft elevation.
Envision a column of air one square inch square in cross face and extending from sea level to the furthermost extent of the atmosphere (space). If you were able to weigh that column, it would weigh the same as a 29.92" column of mercury (14.9 lb) with a cross face area if one square inch.
If you went 5400 feet up and weighed the remaining column of air, with 5400 feet of it gone, what was left would weigh less, or around the same as a column of mercury 25.54" tall.
As you can see, at 5400 feet your concentrate is already under the equivalent of 29.92" - 25.54" = 4.38" Hg of vacuum.
0.3 microns is a good range for short path distillation or sublimation, but for purging it is lower than you need to go and pumps off some of the monoterpenes and cannabinoids that we covet and are typically trying to retain.
For simple purging, I try to stay around 10,000 microns, or -29.5" Hg at around 115F. Easier with a micron gauge, which breaks one atmosphere into 760,000 parts, instead of 29.92, making it easier to read.
