Tom Buck on sun 9 jul 00
Ingeborg F:
You mentioned that your kiln incorporates a specific double-walled
metal pipe (stanless steel) and that you have not encountered any
corrosion for some time.
Years ago, when installng a woodstove, I did a bit of study of
this type of chimney pipe. The metal/bestos design was aimed at people
who installed airtight woodstoves as a retro-fit to their homes. The
two-walled pipe had asbestos fibre insulation between the metal layers
(different now that asbestos is banned). The metal is commonly stainless
steel that resists chloride/fluoride attack. The thickness of the steel
wall is the minimal needed to withstand 1000 oC, the usual flame
temperature of wood burning furiously.
It would seem your use of a lower section of IFB in your chimney
allows the flue gases to cool below that critical 1000 oC. Which may
account for your metal pipe's durability, not to mention that your
claybody and glazes may be free of things that corrode stainless steel
intended for chloride service (sulfur oxides would be such things).
so be happy. til later. peace. tom b.
Tom Buck ) tel: 905-389-2339
(westend Lake Ontario, province of Ontario, Canada).
mailing address: 373 East 43rd Street,
Hamilton ON L8T 3E1 Canada
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