I recently made a "resource post" for HomeBrewFinds on fermentation under pressure. I researched the various sources of info scattered out on the web, and tried to filter them with an engineering mind to glean the key technical aspects and practical applications. I also added my experience with specific pressurized fermentation trials, to add my own dose of first-hand experience. I wanted to share the link in case anyone might find it helpful as a starting point in learning about the process and some of the gear.
https://www.homebrewfinds.com/2021/08/fermenting-under-pressure.html
https://www.homebrewfinds.com/2021/08/fermenting-under-pressure.html