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Old 04-21-2017, 11:56 AM
Eben Horton Eben Horton is offline
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I need a favor

Does anyone here have a thermjet tj-250 kicking around that I could borrow until august?

I just cracked mine and can't get a new one for a while. I guesss they are made to order ??? Crazy.


Here's hoping someone has one sitting on a shelf !
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Old 04-21-2017, 12:36 PM
Charles Friedman Charles Friedman is offline
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What part is cracked? If it is metal, use Marine tex. epoxy. If it is the refractory part contact Pryor Giggey and ask for there patching material.

http://www.pryorgiggey.com/
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Old 04-21-2017, 01:38 PM
Eben Horton Eben Horton is offline
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I think this burner is rebuildable but I am pressed for time due to orders.

I was hoping someone had a backup.
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Old 04-21-2017, 02:19 PM
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Mark Rosenbaum Mark Rosenbaum is online now
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I have a burner that I got from Wet Dog years and years ago (maybe 23 ). It was still functioning when I put in my moly furnace 11 years ago.... How can I tell if it is what you need?
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Old 04-21-2017, 04:07 PM
Eric Trulson Eric Trulson is offline
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Mark, the thermjet should have a sheet metal tag on it somewhere that lists some specs and a part number. Those part numbers usually follow the format "TJ-XXXX", where "XXXX" represents the maximum BTU/hr that burner is rated for.

Eben, if you aren't able to scare up a replacement burner and need to try to repair or patch your current one, I'd be happy to help. I've done a fair bit of work building glass equipment and am only a couple hours north of you.
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Old 04-23-2017, 08:51 AM
Eben Horton Eben Horton is offline
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Thanks Eric !

I have located a loaner and will be picking it up this week, so I am all set, but thank you for the offer.
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Old 04-23-2017, 12:05 PM
Cecil McKenzie Cecil McKenzie is offline
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I was curious as to what cracked on the burner if you have time.? Thanks.
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Old 04-23-2017, 12:40 PM
Eric Trulson Eric Trulson is offline
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No problem Eben, hope you get hot again soon!

I'm curious about the cause/location of the crack myself, actually. I've installed a bunch of thermjets before, but have never had a chance to do regular maintenance or a swapout on one, so I'm not sure what their usual failure modes are.
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Old 04-23-2017, 12:46 PM
Eben Horton Eben Horton is offline
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The thermjet has a cast iron "nozzle" inside the ceramic tip. My burner's ceramic tip was cracked badly and the metal sheath had expanded and warped causing it to compress against the Mizzou burner block. When I tried to remove the burner from the block, the ceramic tip crumbled and the cast iron nozzle cracked in half. The burner is repairable but I chose to save that for another time when I have more time.

Last edited by Eben Horton; 04-23-2017 at 01:27 PM.
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Old 04-24-2017, 01:56 AM
Scott Benefield Scott Benefield is offline
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Have you been running pre-heated combustion air through the Thermjet?
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Old 04-24-2017, 06:59 AM
Eben Horton Eben Horton is offline
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Quote:
Originally Posted by Scott Benefield View Post
Have you been running pre-heated combustion air through the Thermjet?
Hi Scott!

Yes, but I had been monitoring the tempature of the air inlet pipe. It never went above 500 degrees.
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Old 04-24-2017, 07:03 AM
Eben Horton Eben Horton is offline
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The mistake I made was not packing the tip inside the burner block with ceramic fiber. I never knew that this had to be done. Because of this mistake, everything deteriorated over time.
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Old 04-25-2017, 02:08 AM
Scott Benefield Scott Benefield is offline
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Eclipse makes a version of the Thermjet with a stainless spud (instead of malleable iron) for use with preheated combustion air. I think 500F is still too hot for their burner without that option.
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Old 04-25-2017, 09:58 AM
Andy Stenerson Andy Stenerson is offline
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Hey Eben, I think Scott is right about the stainless tip. Once I built my recuperator I swapped the iron for stainless and it's been trouble free. I have a thermjet 250 I'm not using but it's lacking the ceramic nozzle. Let me know if you're interested anyhow
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Old 04-25-2017, 02:20 PM
Eben Horton Eben Horton is offline
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Thanks for the info guys.

i drove 4oo miles yesterday to obtain a loaner and now i have everything to get the furnace rebuilt and back up and running.

I will look into this stainless nozzle. Thanks!
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Old 04-25-2017, 02:34 PM
Hugh Jenkins Hugh Jenkins is offline
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I too have gotten stainless spuds made. I used to have to regularly change out the steel ones both for air and gas. They would actually start to leak around the orifice threads from expansion in the hot air stream or just corrosion. I need to get another set for the new small glory hole so if someone knows a place that would make several I would like to know. The ones i have were gifts made special when I was on the road doing installations.

They are not impossible to make using TOE (threaded one end) stainless nipples and taps and dies, but the wall thickness of the TOEs I get are not precise enough to always get good results.
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Old 04-25-2017, 04:08 PM
Eben Horton Eben Horton is offline
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Hugh, do you use Thermjets with your recuperator systems??
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Old 04-25-2017, 04:57 PM
Hugh Jenkins Hugh Jenkins is offline
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No, Eben, I build the whole thing. My preheated air is in the 1200 to 1400 range. it travels through its own passages into the burner throat.
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Old 04-25-2017, 07:21 PM
Eben Horton Eben Horton is offline
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Ok. That's what I thought!
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Old 04-26-2017, 02:58 AM
Art Freas Art Freas is offline
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Quote:
Originally Posted by Scott Benefield View Post
Eclipse makes a version of the Thermjet with a stainless spud (instead of malleable iron) for use with preheated combustion air. I think 500F is still too hot for their burner without that option.
look for the model number to have PCA in it.
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Old 04-26-2017, 04:02 PM
Hugh Jenkins Hugh Jenkins is offline
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Always have a spare.
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Old 04-26-2017, 04:18 PM
Eben Horton Eben Horton is offline
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What happens when that spud gets too hot inside the ceramic tip is that it expands against the tip and makes it crack. Also the stainless sleeve around the outside of the burner wants to expand and get all punky and warped. My sleeve expanded so much that it put outward forces on my burner block and made that crack and eventually crumble. John Chiles just told me that you have to pack fiber abound the thermjet tip to keep the sleeve from gettting too hot. I never knew that.
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Old 04-26-2017, 08:51 PM
Hugh Jenkins Hugh Jenkins is offline
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It can make a big difference too if you don't watch the gas/air ratio. Some excess air (15% air or 3% O2) works to help cool the burner parts but does not retard the combustion. I just don't like metal parts especially if exposed to back radiation from the fire box. Stainless has its life too, but it is longer.
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Old 04-27-2017, 01:51 PM
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Franklin Sankar Franklin Sankar is offline
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Eben if there is a space around the burner shouldn't it sucks air and keep the burner cooler??? If you put fiber it stops the air and what happens now?
Franklin
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Old 04-27-2017, 08:28 PM
Eben Horton Eben Horton is offline
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Quote:
Originally Posted by Franklin Sankar View Post
Eben if there is a space around the burner shouldn't it sucks air and keep the burner cooler??? If you put fiber it stops the air and what happens now?
Franklin
That logic works with a glory hole, but not with a furnace. I don't know why. Efficiency is my guess
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