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High Heat Spalling

 
Rocket Scientist
Posts: 4685
Location: latitude 47 N.W. montana zone 6A
1743
cat pig rocket stoves
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Hi All;
I replaced the original secondary air tube in our greenhouse batchbox late last season, it had spalled down to unusable condition.
At that time I installed the original prototype Dragontech quick change secondary supply tube in its place.
Yesterday in 15 minutes I replaced the carbon steel riser stub with a new one!
Simply twist and lift the old degraded stub out and drop in a new one!
15 minutes included cleaning all the ash from the firebox .
With my Dragontech design door I was able to simply slide the secondary tube back 6-8" .
This facilitated removing the ash build up in the slotted port entering the riser.
With all the ash removed the air tube slid right back into place without ever removing the door!

Unfortunately I made this repair early in the morning and did not take the time to document the process.
It really couldn't have been any faster or easier!

We burn that rocket hot , nonstop all day everyday from September-  April or beyond.
I expect to change  the riser stub again before the end of burning season.
At $5 or so for a replacement  stub I can do this as many times as needed.
Or for $80 or so I could use a RA330 stub from Dragontech and never need to replace it again!








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thomas rubino
Rocket Scientist
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Location: latitude 47 N.W. montana zone 6A
1743
cat pig rocket stoves
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Hi All;
I installed that "new secondary air stub" on November 12th 2021.
As of today, Feb 25th 2022 it's shot,
My photo show's its current condition.

This batchbox  sees severe use.  It runs non stop  apx 12hrs a day all winter.
3.5 months is a reasonable time to expect a piece of plain steel to last at those temperatures.

With my quick change secondary tube.
It will take just a minute to change that worn out part with a new replacement.
A standard 6"  long piece of 2" schedule 40   pipe is around $5

I have decided to replace it with a stub  of high heat RA330 at $80 .
Time will tell, but I expect this to be the last stub I ever need.
I will update photo's at the end of burning season this year and again Mid burn season next year.


20220226_001038-(1).jpg
After 3.5 Months at 2000F
After 3.5 Months at 2000F
 
thomas rubino
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Approximately 10 minutes including  ash cleanout  from start to building a fire.
20220226_084129.jpg
plain steel & RA330
plain steel & RA330
20220226_084149.jpg
Ready for new stub
Ready for new stub
20220226_084214.jpg
RA330
RA330
20220226_084456.jpg
A smooth takeoff
A smooth takeoff
20220226_104909.jpg
Full burn
Full burn
 
pollinator
Posts: 462
Location: Toyoura Hokkaido
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Thanks Thomas!

Appreciate all the time you take to document!

Hope all’s well…

Peter & Co.
 
You may have just won ten million dollars! Or, maybe a tiny ad.
Rocket Mass Heater Jamboree And Updates
https://permies.com/t/170234/Rocket-Mass-Heater-Jamboree-Updates
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