Flue pipe External temp v internal temp

[ArsenalDon]

So I have double walled insulated flue pipe inside going to the outside which then is Class A pipe...Disclaimer....I think I am recalling this all correctly from listening to my installer....the question is, I have an IR thermometer, is there a formula or a way to know using the IR what the temp is inside by shooting the outside? I can get an outside pipe temp of course but wanted to have an idea of what might be the temp inside.

 

[begreen]

Not really. I have tried this and found the results to inconsistent. A probe thermometer will provide much more accurate readings.

 

[bag of hammers]

I asked a similar question a while ago and got a few good insights

https://www.hearth.com/talk/threads/double-wall-pipe-flue-temp-vs-outside-surface-temp.100818/

 

[Jags]

There is very little correlation to surface temp of double walled insulated pipe to the actual internal temp. Something as simple as what stage of the burn you are in could yield drastic differences in your reading. Get a probe and get the facts.

 

[ArsenalDon]

I asked a similar question a while ago and got a few good insights

https://www.hearth.com/talk/threads/double-wall-pipe-flue-temp-vs-outside-surface-temp.100818/

Yup, good insight...kinda what I thought people would say...no way to really do it. I am sure I am fine, my first clean out came up with zero ugly creosote and that was From October to a week ago, just fine ash that was easily brushed out

 

[ArsenalDon]

Not really. I have tried this and found the results to inconsistent. A probe thermometer will provide much more accurate readings.

is a probe easy to install?

 

[Jags]

is a probe easy to install?

A drill with the appropriate sized bit. Done.

 

[certified106]

Definitely get a flue probe....... they only require drilling a hole through the pipe and sliding the probe in. You will feel much better knowing what the actual flue gas temps are doing.

 

[firefighterjake]

A drill with the appropriate sized bit. Done.

Two bits in my case . . . one smaller than the other . . . I forget the exact sizes.

A 5-minute job with the first four minutes being me worried about somehow messing things up and destroying an expensive piece of doubewall pipe and so I read and re-read the directions.

 

[Jags]

Two bits in my case . . . one smaller than the other . . . I forget the exact sizes.

A 5-minute job with the first four minutes being me worried about somehow messing things up and destroying an expensive piece of doubewall pipe and so I read and re-read the directions.

Good call. It should have said bit(s).

 

[bag of hammers]

Don't forget to remove it before you run a brush down the pipe. Just saying' (oops).....