What I mean by PSI meaning nothing is how it relates to fuel use and efficiency. So many people assume a blown burner running at 2 PSI is more economical than a Venturi burner running at 7 PSI, when the fact is, the Venturi burner may be only using half the propane of the blown burner.
How many "well designed" blown burners have you seen while looking through many of the homemade forge building sites? I surly haven't seen many. When the forced air pressure drops, the flame no longer wants to burn at the mouth of the burner opening. Sometimes the chamber will fill with gas and then ignite, shooting a fireball from the forge openings, and other times the flame will burn back into the burners mixer, I've seen both with a commercial unit (Mankel). So the point I was making was PSI has absolutely NO bearing on fuel use and efficiency, as so many imply.
A blown burner with a large enough orifice can run off of a BBQ regulator with only 11 Water Column Inches, but still flow a huge amount of LP, it is dependent on the Forced air and Mixing chamber design to create the proper fuel mixture. A Venturi burner depends on pressure in the Bell to create the Venturi effect (high pressure in the bell results in low pressure above the bell). But even with that, PSI still has no bearing WHATSOEVER on efficiency and economy.
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