Re: Wood stove chimney danger - help please

Janet Baraclough <janet.and.john@xxxxxxxxxxxx> wrote:
That website says "Isokern are a reputable company who are the market
leaders in the field. The flue liner comes with a ten year warranty,
C.S.T.B. approval and has been tested up to 1000 degrees centigrade."

http://www.isokern.co.uk/sc_fl_supa.asp

In fact Isokern, the manufacturer, describes the liner as approved
for a working temp of 500C, and thermal shock of 1000C. They specify
that to use it with wood, the wood must have been kept dry for 1 to 2
years, and its clear from the wording of their site that the flexible
chimney is actually intended for coal, gas, oil appliances.

If you burn a woodstove hot every day (as you should, to remove
chimney tar deposits) the flue temps are way above that 500C. A tar
fire in a woodstove chimney can produce temperatures of well over
2000C, at which a liner like that will disintegrate. Isokern say that
their flexible liner must be replaced after even a single chimney fire.
Well, that's one way of putting it :-)

You sure your flue temp and chimney fire temps in that last paragraph
aren't in F instead of C?

Cast iron melts around 1540C. Steel melts around 1370C. I don't see how
you could use a stainless chimney liner with a 2000C fire.

500C = 932F which sounds about right for a day to day flue temperature.

.

Relevant Pages

  • Re: Wood stove chimney danger - help please
    ... chimney tar deposits) the flue temps are way above that 500C. ... at which a liner like that will disintegrate. ... their flexible liner must be replaced after even a single chimney fire. ...
    (misc.rural)
  • Re: Saving My Fireplace
    ... With the lights off and using a flashlight, I realized smoke was ... joints in the flue tiles, leaking down around the flue inside the ... brick chimney above the firebox, and ultimately into the house (and ... of using a round liner and the resulting impact on flue diameter ...
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  • Re: Gas Furnace: Line the Chimney or Add a Powervent?
    ... I noticed in the attic that some of the mortar is crumbing on that flue. ... After reading some articles online & in magazines, I think the problem is that my boiler is causing too much condensation in the cold part of the chimney. ... I am thinking of either a) purchasing a power vent and redirecting the gas exhaust out the side of the house OR b) lining the 2nd flue with a gas-compatible liner. ...
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