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Burner to cubic inch relationship


ES0NE

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Maybe; most of the heat loss in a modern forge is right out the exhaust port(s). Adding insulation mostly just reduces internal dimensions; not much available there in additional heat loss reduction, because of inevitable diminishing returns. However, reflective coatings, and other "add-ons" can be included, step by step as needed, to bring performance up to snuff :)

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  • 5 months later...

 Here it is as promised.

Burner: Size, Output, and Forge Volume Ratio.

Burner "size" is measured by the Inside Diameter of the mixing tube. Homemade naturally aspirated burners are not precision instruments so you can safely assume the standard plumbing part sizes as marked are close enough to get you within tuning range.

I won't be discussing builds now, this is a list of how output and size relates.

The output of a burner is generally determined by the area of the cross section of the mixing tube. Yeah, it's  time for, 3.1416 r squared.

The cross section of a 1" ID burner has an area of 0.7854 sq ".

A ¾" ID burner = 0.4418 sq"

A ½" ID burner = 0.1963 sq."

As you can see a ½" burner is just under ½ the area of a ¾" burner which is just over ½ the area of a 1" burner.

You can use this simple ratio to determine how many or how large to make burners depending on size and shape of the forge.

A single, ¾" burner will bring a generally mono dimensional 300-350 cu" forge to welding temperature. "Mono dimensional" meaning all 3 dimensions are roughly the same.

If the forge chamber is long and narrow or perhaps long wide and shallow you may need more but smaller burners. Two ½" burners are roughly equivalent to one ¾" burner and there is no problem using four or five ½" burners to equal one 1" burner.

Frosty The Lucky.

 

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