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It'd be nice to have more info as to your situation, amount of land, amount of brush to be burnt, close fire hazards, etc. In order to provide a better answer.
However, a decent general purpose burning barrel can be made from a steel drum pretty easily.
- Take off the top. One line of thought is to cut it off below the rim (top seam). I prefer to keep that top rim for the added strenght. And just cut out the top plate. Using a reasonably sharp hand axe and hammer/hand sledge. When done, I fold down sharp edges using large channel locks.
- Using same hand axe and hammer, I put a couple to 4 small holes right above, touching the bottom rim. Not air holes. Drain holes. To let water drain out if barrel is left in the rain.
- Starting at about 6 inches from bottom rim, I form air holes. Using axe and hammer. Holding axe blade cocked so that corner of blade is driven in to form wedge shaped hole. I make 4 evenly spaced holed around barrel at the 6 inch height mark. Do same at the 1/3 and
Holes need not be huge. In fact, very large has it's disadvantages. Makes for a faster, more fierce burn, which is harder to control and tends to cause a LOT of sparks and burning embers to be thrown off out of the top of the barrel. Not good. Add, the larger the holes, the worse the problem with hot ashes falling out of air holes. Generally I make air holes wedge shaped, about an inch wide at top, sides of inverted trinagle coming together about 2-3 inches down.
Do air holes get clogged? Yep. I keep large 24 inch lenght flat tip screw driver or hunk of iron rebar handy. Occassionally ram into air holes which seem clogged, jiggle around to clear hole.
- Then I usually get some 1/8 or 1/4 thick expanded metal plate (it's like a grid or grate). I usually go over to a place I know that makes trailers and fixes farm stuff. They've always got a large supply of all sorts of metal plate, expanded metal, angle iron, and so forth. Buy a 2 by 2 foot hunk of expanded steel plate. And a hunk of flat bar. Cut expanded metal to fit barrel. Bend flat bar around and cut to fit. Weld bar to expanded metal. Use a little extra flat bar to make handy handle.
I also buy hunk of 1/8 or 3/16 solid plate and attach rim and handle it. To make a solid cover. To help snuff and cover flames.
Expanded metal cover comes in handy if material being burned tends to throw off large hunks of hot, but light stuff. ie Leaves, paper, etc. I don't have the problem of some who live in areas where lot of vegetation grows, but which then dries out a lot and is a really touchy fire hazard. A few small embers being tossed off fire around here isn't a problem. But I don't want large, flaming floaters being tossed about.
A pretty simple method. I could get fancier. But this method is easy and cheap. Has worked well for me for years. And I've made numerous copies for friends.
Now, I've seen guys get fancy. And make adjustable air flow grates via one method and another. To allow more or less air. Seen everything from regular air grate with sliding metal cover to open holes smaller or large. To a guy down the road who took time to weld several short pipe nipples onto barrel in different locations. He screws on or removes pipe caps to adjust air flow. Or there is an old guy, dead now, I used to know who'd made some crude and rough, long "corks" outta some extra fire brick he had about the place. Would remove or shove in firebrick "corks" to increase or decrease air flow. And thus firing rate.
My method works for me. I control firing rate via amount of fuel added.
Holes at different levels, on all sides of barrel makes for good all around burn. I don't have problem of collecting partially burned material in some dead air space or area of poor air circulation. When I burn, when done, all I've got is fine, well burnt ashes left.
Best to start burning slowly til you have a good feel for how large flames will get in given situations of wind and fuel combinations. People usually get in trouble when they push it, get in a hurry. And/or don't keep eye on barrel and leave it unattended for significant periods of time.
I have a set place for my barrel. Away from house and other structures. I kept predominant wind direction in mind when picking spot. Keep grass and other vegetation away in 3 foot area around barrel. And have a water hose strung nearby and ready if needed.
You'll probably get other ideas. Undoubtedly some better than mine. But I deliberately don't make mine fancy. Gets used a lot. And every few years barrel needs replaced. Or, at least I think it does. I don't wait for walls to get real thin. Finding a new barrel just requires asking about. Cutting out top, and punching in new holes takes little time. My solid cover and expanded metal cover have both outlasted several barrels.
Bob