Bringing propane in to building is really not all about pressure, its about VOLUME... Ideally you can bring propane is at 10 psi and should have a individual regulator for each torch, adjustable to what ever PSI you desire for each torch. IF that is not possible/practical, then you probably should use a single regulator set at 5 PSI (you choice of pressure value) and use piping that can handle the volume. Building Codes regulate that you can not exceed a pressure 10 PSI for bringing propane into a residence, it may be different in commercial space, but you will have to check codes.
Volume is provided by using fair sized piping (3/4 - 1 inch pipe) and a external regulator the can handle a volume of gas (usually stated in BTU)...
It's not insane pressures that create volume, it is large diameter piping at low pressures....
If you think about a residence (for example) its possible to have a gas water heater, a gas stove with 4 burners and a oven (all going at once), a forced air furnace, and possible a gas clothes dryer all going at once (not probable though) being fed by a single medium sized regulator and 3/4 inch pipe from tank to house, at about 1/4 PSI (11 inched Water)... I'm sorry but I don't think your propane people understand the needs or they are trying to sell you a system beyond your physical and financial needs...
The certification part may be the need to have a plumbing permit from local building code authority and have installation inspected for proper design and construction before its put into use. Check with local building code enforcement people in community where studio will be located... Since its going to be a teaching studio and the "public" will be in attendance this is probably going to be a "must do" issue.
Dale
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San Francisco - A Few Toys Short of a Happy Meal
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