Relationship between flue gas temperature and stovepipe temperature.

[m37charlie]

I have an older but well functioning (with new catalyst) King. I have single wall black sheet metal 8” pipe till it enters overhead “metalbestos”.
Even when the catalyst is glowing red or even orange at thermostat setting 2.0-2.5, the pipe temperature just above the lower 45 is only rarely >100C.
Does anyone know what actual flue gas temperature would be?

 

[Highbeam]

200 Celsius. Internal should be about double skin temperatures.

I bet it was noisy when those tiles fell!

 

[m37charlie]

Incidentally when we bought the house in 88 there was a fireplace in that corner. To my pleasant surprise I discovered it had an 8” metalbestos (Selkirk) stack. The walls are spaced ouu with 1” air space with gap at bottom and top for convection, ceramic spacers, cement board under tiles backed by sheetrock, etc.
Just had Selkirk stack replaced 2 years ago prophylactically after35 years/200 cords. Only damage was a bit of rust on top outside, minimal creosote despite very few cleanings.
I used to buy wood when working. Now I have arrangement with tree service, they drop off logs - 3 cords of logs in 15’ trailer for $40/cord.