No! It is very dangerous to use propane in any place that does not drain to the outside. If you spray water in you brewery if there is any place it can puddle without flowing outside then you should not use propane. If there is any leaks it will puddle. Any pools of propane are extremely dangerous! Regulators have a vent and if the diaphragm breaks it will vent the tank of propane. This is not at all uncommon. If you were to have a pilot light or a random spark from metal on metal contact or an electrical spark your whole house will disappear. Any regulator installed indoors needs a hose connecting the vent to the outdoors with a trap and screen to keep water, debris and insects out.
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