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  1. http://www.exothink.com/Pages/btu.html Working with my propane supplier ( I am a portable tank schlepper ) has made me more aware of fuel consumption rates for forges and crucible furnaces. I typically get 3 crucible runs from a 10 Gallon tank. say 3 gallons per run of about 1.5 hrs or 2 gallons per hour. ( 360 inches cubed = volume) 180,000 BTu/hr My forge is the same furnace probably running a little slower, say at 1.5 gallons per hour.....I can run the forge at a much lower rate but the 1.5 is typical.( 360 inches cubed = volume). 135,000 BTu/hr NOw I am sizing a forge to heat blooms at about 720 inches cubed of internal volume...? Does that suggest a 135,000 x 720/360 or 270,000 BTu's/hr or is there something I am missing. The frequent crucible runs scheduled for this winter will provide me with an opportunity to verify or compare the effectiveness of forge coatings, including some of the products frequently mentioned here. If any one has a recommended experiment to run ...put it out there and we will probe it. I don't think you would want to be stuck with my suggestion All experiment have some implicit criteria ...such as it has to repeatable by another person and the information needs to be numerical not anecdotal and so on and so on. Jan
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