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Yes, ANOTHER OWB build thread... (Tank in tank style)

Discussion in 'Firewood, Heating and Wood Burning Equipment' started by breymeyerfam, Jul 16, 2016.

?

Water volume in owb? 2500sf home and 34x48 shop

  1. 100 gallons

  2. 200 gallons

  3. 300 gallons

  4. 400 gallons

  5. 500 gallons

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  1. NSMaple1

    NSMaple1 Addicted to ArboristSite

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    Like your fan issue, water movement & heat transfer inside the boiler will likely be a fuzzy picture until you actually get burning with it. I think the locations you are planning for supply & return are the best for those purposes - but you also might end up needing to install a separate mixing pump to prevent localized boiling at possible hot spots above the firebox. I can picture there not being a lot of water movement in the top front part of your water jacket. Your system flows etc. will also play a part - so if you can plan for that eventuality now, adding a second pump later will be easy. Maybe extra ports top front & bottom rear? I know I have heard of guys with Garns adding secondary mixing pumps - they generate a LOT of heat in a big hurry though.
     
  2. breymeyerfam

    breymeyerfam Addicted to ArboristSite

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    Blower duct through the door. Is regular fiberglass insulation ok or do I need rock wool or something like that?
    20160814_135130.jpg
    As for heat transfer and water flow, I have contemplated making some baffles to direct water flow within the tank...
     
  3. breymeyerfam

    breymeyerfam Addicted to ArboristSite

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    Finally getting some more progress to show. I ended up going with mineral wool insulation in the door since it is good to 2000°. Door fab finished. Fit is pretty good. The 1" rope is just a slight squeeze. (Made groove 7/8")

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  4. breymeyerfam

    breymeyerfam Addicted to ArboristSite

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    Fitted the blower and draft door/ solenoid assembly. Door closes by gravity(made plenty heavy to make sure it closes no problem). Solenoid was kinda abrupt when triggered, so I used a heavy spring as my linkage to take the initial abuse of the big solenoid(4x241).
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  5. breymeyerfam

    breymeyerfam Addicted to ArboristSite

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    Not alot to show. Wire wheeled all the paint off the outside of the firebox. No paint chips in this water system!
    20160828_114313.jpg
    Purchased the most expensive part of this project... (Logstor pipe). Went to Greenville Ohio to Classic Comfort. Good guys to deal with. The second pic shows the end of the pipe. Real thick outer jacket! Perfect for me due to rocky soil.
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  6. breymeyerfam

    breymeyerfam Addicted to ArboristSite

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    Prepping the tank for fittings. Going to weld in 3 ins/outs. Only need 2 right now. Welding in pipes for 2 so that the water is drawn from the center of the tank. Hopefully that will promote equal flow around the firebox. Returns are going directly centered under the firebox near the front. Two thermowells(will use whichever one shows the highest temp).
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  7. breymeyerfam

    breymeyerfam Addicted to ArboristSite

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    Firebox is fitted and tacked into the outer tank. Now a bunch of welding to do.
    20160911_171625.jpg
     
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  8. WoodTick007

    WoodTick007 Addicted to ArboristSite

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    I am curious how you came to the conclusion that mig/wirefeed welding is/was not designed for "critical" welds/welding. If concerned one could select a dual shielded fluxcore wire. Your not building a rocket booster for the Challenger. . . you welding together two old propane tanks to burn solid fuel in your yard. . .
    Speaking of the Challenger. . .they mig welded the rocket booster with a Harbor Freight one heat setting 90am 110v mig welder. . . obama's cost cutting again.
     
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  9. breymeyerfam

    breymeyerfam Addicted to ArboristSite

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    No reason other than I'm not a professional welder and haven't stick welded since I've bought a mig(15 years ago).
     
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  10. PSUplowboy

    PSUplowboy Firewood cutter

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    I mixed castable refractory and perlite together to insulate my door after rebuilding it. I forget the ratio- but I remember finding it on a site for homemade kilns. It seemed to work better than new other than the door being heavier. It has less creosote building up around the inside door edges.

    Something like this:
    http://www.myheap.com/casting-molding/my-heap-mold-book/chapter-1-materials/how-to-make-irc.html
     
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  11. breymeyerfam

    breymeyerfam Addicted to ArboristSite

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    Face fully welded to the outside tank.
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  12. svk

    svk A little bit of everything

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    Boy I wish I could weld like that.
     
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  13. breymeyerfam

    breymeyerfam Addicted to ArboristSite

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    More welding done tonight. All the bungs fully welded in. Three returns, two 1" and a 1.5", equally spaced every 6" from the front directly under the firebox.
    20160914_200021.jpg
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    The two 1" draws I will be using have dip tubes that will pull water centered in the tank, roughly 4.5" from the top, and an extra 1.5" for the future. Two 1/2" for thermo wells(will use which ever gives the hottest reading).
    20160914_200253.jpg

    Decided that welding the flue from the top was going to be much easier than from the inside. So cut an access panel and will weld it back in around the flue after the flue to firebox weld is complete. Root weld is done, but out of time for the day.
    20160914_200158.jpg
     
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  14. Woodyjiw

    Woodyjiw ArboristSite Operative

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    Looking good..
     
  15. PSUplowboy

    PSUplowboy Firewood cutter

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    Are you dropping your chimney pipe down in below the top of the tank? If so, is it near the back of the boiler? I can't see well in the pics. Cool project!
     
  16. breymeyerfam

    breymeyerfam Addicted to ArboristSite

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    Yes, the flue sticks down halfway in the firebox, and is almost at the very back.
     
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  17. PSUplowboy

    PSUplowboy Firewood cutter

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    That sounds good. I fixed fire in a boiler once that had the pipe way down in it, but it was near the front. It was easy to hit with every piece of wood going in and it really seemed to keep a person from "filling it up ".
     
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  18. breymeyerfam

    breymeyerfam Addicted to ArboristSite

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    Patch plate rough fitted up.
    20160915_191122.jpg
     
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  19. breymeyerfam

    breymeyerfam Addicted to ArboristSite

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    Worked on door hinges today. The door and hinges were by far the most challenging parts of this build. Made the hinges fully adjustable.
    20160918_192835.jpg
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  20. H-Ranch

    H-Ranch ArboristSite Guru

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    Sure didn't use the "hillbilly with a welder" design on the hinges - maybe that's why they were the most challenging part. ;)

    Looking good. You're going to have to hustle to get it done for the start of the season. When you get to the legs, make it taller than you think you need it. I like not having to bend down to see how to put the last log in.
     
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