This is an old thread, but I'm having this same issue with my state building inspector. The inspectors words are stated below, but I need to show what the internal psi is for a pot still. Are there any documented studies showing this that I can use as a reference? Thank you.
Occupancies
H-2- distilling if still runs at a pressure greater than 15 lbs., if less than 15 lbs. the distilling will be classified as a H-3, need manufacturer’s specifications to determine the still’s operating pressures
H-3- for the barrel storage
M- retail area for tasting