Win a bunch of tools from Truly Garden and Loma Creek! this week in the Gear forum!
  • Post Reply Bookmark Topic Watch Topic
  • New Topic
permaculture forums growies critters building homesteading energy monies kitchen purity ungarbage community wilderness fiber arts art permaculture artisans regional education skip experiences global resources the cider press projects digital market permies.com private forums all forums
this forum made possible by our volunteer staff, including ...
master stewards:
  • Nicole Alderman
  • r ranson
  • Anne Miller
  • Pearl Sutton
  • James Freyr
  • Mike Haasl
  • paul wheaton
  • Dave Burton
stewards:
  • Joylynn Hardesty
  • Jocelyn Campbell
  • Joseph Lofthouse
garden masters:
gardeners:
  • Carla Burke
  • Steve Thorn
  • Eric Hanson

Heat Riser Insulation

 
Posts: 60
Location: Southern USA
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
I've read the books and looked on this forum. When using a steel pipe and using perlite as insulation in the heat riser, perlite is always mixed with clay/slip to keep it's shape, so when/and/if the steel heat riser wear's out, the perlite insulation will stay put. But it (perlite/clay/slip) takes a long time to dry if it's too wet a mix. Why mix the perlite with clay slip in the first place? Why not leave it dry (best insulate) and if the steel pipe wear's out, you'll know it when you see perlite in your clean outs? Wouldn't it be nice to know that your heat riser has worn out? and needs replacing? I'd like to use a clay/sand layer at the bottom and top of my insulation and dry perlite in between. Good idea? ______ Bad idea? ______
All this because I've know one person who built a RMH, had a problem weeks later with it, and found that their clay/slip/sawdust insulation was STILL WET after all this time!
RMH-HeatRiser.jpg
[Thumbnail for RMH-HeatRiser.jpg]
 
gardener
Posts: 2519
Location: Cincinnati, Ohio,Price Hill 45205
186
forest garden trees urban
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
The other reason for the clay is settling of the perlite, as much as a few inches a year.
Also your design seems like it would be hard to patch...
 
Posts: 67
1
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
when that inner lining of the heat riser burns out you not just going to see some pearlite in your clean out... the whole internal mass of pearlite is going to collapse inward if you dont have a binder

also note. the inner pipe is not the heat riser its merely there to hold the refractory in place so the it can cure into its structure its meant to burn out...
 
Pack McKibben
Posts: 60
Location: Southern USA
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
brian: thanks....
 
sunglasses are a type of coolness prosthetic. Check out the sunglasses on this tiny ad:
holiday shopping for 2019
https://permies.com/t/128446/holiday-shopping
  • Post Reply Bookmark Topic Watch Topic
  • New Topic
Boost this thread!