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Old 02-21-2012, 02:10 AM   #21
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Weld the spear to the center of the keg. Let the flames shoot through the center of your wort. This would give the best efficiency with gas.
That's new information to me. I cut a hole in the bottom of a keg, weld the spear and the heat goes up through the center, Not only heating the bottom but also the middle.
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Old 02-21-2012, 02:15 AM   #22
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That's new information to me. I cut a hole in the bottom of a keg, weld the spear and the heat goes up through the center, Not only heating the bottom but also the middle.
So you've tried this?
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Old 02-21-2012, 01:12 PM   #23
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I had a SS tube welded into the center of my HLT to conduct some of the hot gasses up through the liquid and it worked fine. I even put a strip of sheet SS with a twist inside to give the gas a little spin or turbulence. I got the idea from a regular gas-fired domestic water heater.... It seemed like there wasn't as much heat washing out from beneath the kettle trying to go up the outside which was insulated.

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Old 02-21-2012, 01:38 PM   #24
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I had a SS tube welded into the center of my HLT to conduct some of the hot gasses up through the liquid and it worked fine. I even put a strip of sheet SS with a twist inside to give the gas a little spin or turbulence. I got the idea from a regular gas-fired domestic water heater.... It seemed like there wasn't as much heat washing out from beneath the kettle trying to go up the outside which was insulated.
Any pictures by chance?
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Old 02-21-2012, 03:43 PM   #25
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Weld the spear to the center of the keg. Let the flames shoot through the center of your wort. This would give the best efficiency with gas.
Brilliant!! Ive gotta see this? Pics??
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Old 02-21-2012, 11:50 PM   #26
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I could only find a few pics - I sold that rig last year. As I recall, we made a hole in the bottom of the keg just large enough for the tube to pass through and fuse-welded it to the bottom with a TIG machine. You can barely see the underside in one of the pics. I made a restrictor from a SS washer to sit on top of the flue to keep the flames from shooting out of the top. The lid has a flap that slides open to let the gasses out & to help keep the heat in when the burner is off. I hope this helps.....

hlt_burner_r.jpg   hlt_flue_r.jpg   hlt_flue_restrictor_r.jpg   hlt_lid_r.jpg  
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Old 02-22-2012, 01:24 AM   #27
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I could only find a few pics - I sold that rig last year. As I recall, we made a hole in the bottom of the keg just large enough for the tube to pass through and fuse-welded it to the bottom with a TIG machine. You can barely see the underside in one of the pics. I made a restrictor from a SS washer to sit on top of the flue to keep the flames from shooting out of the top. The lid has a flap that slides open to let the gasses out & to help keep the heat in when the burner is off. I hope this helps.....
Junk, that's great! I've been recommending this for years, but I've never seen it actually done. I have an electric rig so not me.

Thanks!

BTW, did you ever assess whether the channel in the middle made a significant difference?
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Old 02-22-2012, 12:00 PM   #28
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Well, the MLT was insulated the same way and had the same type of burner under it. If I put the same amount of water in each, the one with the flue got up to temperature faster but I never did any testing besides that.

It was one of those things where the materials were on hand & we were welding fittings on vessels and the guy doing the welding was in a good mood and had time that day! I sold it (it's still working fine) and am going electric.

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