Kaowool coverage formula

Sam Salvati

Sam Salvati

Joined
Aug 6, 2007
Messages
5,060
Can someone help me to find the formula I would need to figure out how much kaowool/inswool I would need to cover the inside of a 55 gallon drum? Tired of all these dang sword blades hanging around collecting up dust.......:grumpy::D
 
Surface Area of a Cylinder = 2 pi r 2 + 2 pi r h

(h is the height of the cylinder, r is the radius of the top)

Surface Area = Areas of top and bottom +Area of the side

Surface Area = 2(Area of top) + (perimeter of top)* height

Surface Area = 2(pi r 2) + (2 pi r)* h

In words, the easiest way is to think of a can. The surface area is the areas of all the parts needed to cover the can. That's the top, the bottom, and the paper label that wraps around the middle.

You can find the area of the top (or the bottom). That's the formula for area of a circle (pi r2). Since there is both a top and a bottom, that gets multiplied by two.

The side is like the label of the can. If you peel it off and lay it flat it will be a rectangle. The area of a rectangle is the product of the two sides. One side is the height of the can, the other side is the perimeter of the circle, since the label wraps once around the can.
So the area of the rectangle is (2 pi r)* h.

Add those two parts together and you have the formula for the surface area of a cylinder.

Surface Area = 2(pi r 2) + (2 pi r)* h
 
Sam doesn't let pie (pi) sit around long enough to do math with it.

Sam measure around the drum and the height of the drum. That is the size of the sheet needed to line it (it should be approx. 3X6 feet).You can use several pieces to attain this size. For the ends, measure across the end. You need a square that size to line the end (approx. 2X2 feet). Roughly speaking, you need 26 square feet of Kaowool. Use the Hi-Z wool and build it up in two layers. Make the layer joints offset to each other. This will make a great drum forge.
Stacy
 
I think the more important formula to consider here is how much propane it'll take to run something that size. Let's see, at 20 lbs. per minute... :D

On the other hand, the way you banged out that sword at Ashokan, you might be able to do the whole thing in one heat now, ending up with a net savings. :)

Josh
 
Why do you need so much diameter. I think they make a smaller barrel of about the same length. Or go to a piping joint and get a piece of like 12 inch pipe. I work with pipe all the time and know that pieces of new and old are often discarded or pile up. jim
 
Hehe thanks guys! jkf96a it has been a long time since math class, but your explaination was perfect, thanks very much.

Stacy, and it is getting to be pie season too! Time to go pie hunting:D.

Josh and Jim, this is not a forge for forging, it is a heat treating forge. Designed by Don Fogg, who says it is easier to keep an even heat in a large area as opposed to a small area. It is used mainly for heat treating, so you are only running at a few pounds at most, less if you use a blown burner. It can be used for knives but I think it serves best for swords, where it will ahieve a nice even heat over the whole length.

Here is the link to Don's site with the info on the drum forge:

http://www.dfoggknives.com/photogallery/DrumForgePS/DrumForge.htm

I have an old fire extinguisher and a section of oxygen tank for when I build a forging forge:D.
 
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