marty
New Member
Posts: 6
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Post by marty on Jul 15, 2015 14:17:47 GMT -8
dear PEOPLE I am looking for an answer about zinc. I am building a massive 10inch RMH for a 1000ltr. galvanized hot tub. The tub is 6foot wide and will serve as the ceiling of my barrel. the barrel walls are refractory cast. The hot tub will be suspended by a sheet of 1/4" mild steel 6 feet wide. the heat riser(also refractory cast) will be focused on the centre of the steel but not directly onto the galv.tub for fear of heat fatigue. I am contemplating cutting large holes in the steel sheet to allow the tub to heat up quicker than thermally conducting through the solid 1/4"sheet. These holes will be 18" wide exposing the galv. tub floor to the barrel's` interior environment . This RMH will probably get very hot in excess of 2000f. My question to you is whether or not you think that the galv. tub will experience metal fatigue or brittlement or strength loss of any sort( with being in the hot barrel environment)? Keeping in mind that I am never lighting the RMH when there isn't a ton of water in the tub and that the flame won`t directly hit the galv. tub but instead be deflected heat. Any info would be appreciated. Thanks, Marty
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Post by shilo on Jul 16, 2015 6:51:39 GMT -8
water is limited to 100c you can cook tea in a nylon
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morticcio
Full Member
"The problem with internet quotes is that you can't always depend on their accuracy" - Aristotle
Posts: 371
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Post by morticcio on Jul 19, 2015 1:00:26 GMT -8
I am building a massive 10inch RMH for a 1000ltr. galvanized hot tub. The tub is 6foot wide and will serve as the ceiling of my barrel. Sounds like your hot tub will quickly turn into a cook pot!! Why not direct the flue gases under the hot tub after the (insulated) barrel. This way the bottom of your tub isn't exposed to direct flames. You could build a flap to divert the gases when the water in the tub is up to temperature.
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Post by sothiseeker on Aug 12, 2015 12:28:22 GMT -8
Great topic, this is what we are working on right now, and also had considered running the exit flew underneath the hot tub. Additionally we are going to build one end of the tub up close to the manifold with non insulating brick or cob between the manifold and galvanized tub. Thirdly, we are considering running a copper tube from the tub water to the barrel where it will be coiled around the outside and back into the tub once heated. This last bit could be overkill. Any opinions?
Thanks!
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