• Post Reply Bookmark Topic Watch Topic
  • New Topic
permaculture forums growies critters building homesteading energy monies living kitchen purity ungarbage community wilderness fiber arts art permaculture artisans regional education experiences global resources the cider press projects digital market permies.com all forums
this forum made possible by our volunteer staff, including ...
master stewards:
  • Nicole Alderman
  • raven ranson
  • paul wheaton
  • Jocelyn Campbell
  • Julia Winter
stewards:
  • Burra Maluca
  • Devaka Cooray
  • Bill Erickson
garden masters:
  • Joylynn Hardesty
  • Bryant RedHawk
  • Mike Jay
gardeners:
  • Joseph Lofthouse
  • Dan Boone
  • Daron Williams

An example of metal spalling  RSS feed

 
gardener
Posts: 1273
Location: latitude 47 N.W. montana zone 6A
115
  • Likes 1
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
Hi All ;  Wanted to show an example of how only medium high heat can spall metal.  The "peter " channel for my J tube is on its 3rd season.  This was brand new 3/16 carbon steel.  By the end of last season it was looking warped... A few months into this season and it looks BAD.  Temperature on the plate just as it end is rite around 1000 F + , temp in the burning bottom of firebox was over 1500 F . Inside the burn tunnel and coming up the riser, I can easily see how the temps are getting in the 1800 F + range .  If 1000F did this to my air channel what would 1800 F + due to a metal core or riser ...  well my guess is the same thing it did to my plate steel only twice as fast...  Yes metal will hold up for a season .... maybe even two, but ultimately it will fail. Build your core out of fire bricks or clay/perlite but do not build it out of steel or it will not last.  The last photo's show just wood just sitting in the hot J tube and hitting 456 F and spontaneously igniting !   
DSCN0026.JPG
[Thumbnail for DSCN0026.JPG]
1500 F
DSCN0034.JPG
[Thumbnail for DSCN0034.JPG]
looking rough
DSCN0036.JPG
[Thumbnail for DSCN0036.JPG]
456 Fahrenheit... bursting into flame
DSCN0041.JPG
[Thumbnail for DSCN0041.JPG]
2 minutes later the dragon roars again !
 
Yeah. What he said. Totally. Wait. What? Sorry, I was looking at this tiny ad:
Binge on 17 Seasons of Permaculture Design Monkeys!
http://permaculture-design-course.com
  • Post Reply Bookmark Topic Watch Topic
  • New Topic
Boost this thread!