Heat Radiation

[MiketheEngineer]

Please help this poor old structural.

Scenario:

Metal pipe running a process at 900 degreees F
Piece of wood at 6'' from pipe - doesn't matter what kind of wood as all will start charring at about 450-500 F
Ambient air temp is 75 F
No wind
Humidity is say 30%

IS there an equation or table that will tell me at about what temperature the piece of wood will attain?? Obviously I am afraid of fire and wood degradation.

Thanks for any help...

 

[rb1957]

is there no lagging on the pipe ? 900F seems pretty hot not to protect.

what's the pipe dia ? maybe if the pipe OD gets to 900F, then a point in space 1R away from the pipe would eventually get to 450F, or would it be 225F ...

 

[IRstuff]

Is the pipe steel? How thick?

TTFN

FAQ731-376

 

[MiketheEngineer]

Pipe is non insulated (they are re-insulating) and diameter is proabably 6 - 12'' - it varies.

Temp is in the 800-900 F range at the surface of the pipe --- and is proably some type of steel or stainless steel.

Even if the temp is 700 F - I still would like to know if there is a way to predict the temperature.

I have suggested they get an infrared thermometer and do a a test. Which we may end up doing.

Thanks for any help

 

[JStephen]

There's not a quick and easy way to work this out. You need to calculate radiation heat transfer (requires view factors and emissivities among other things) and balance this again convection heat loss out of the wood (which you probably can't get any good data on due to the geometry).

Don't they sell shielding to go behind stove pipes in houses?

 

[MiketheEngineer]

Actaul application is wood scaffold plank setting near process pipes that are being re-insulated.

So this is temporary but still a concern. We can't have the plank catching fire.

 

[IRstuff]

Big fan blowing over plank/pipe is probably the simplest solution.


TTFN

FAQ731-376

 

[MiketheEngineer]

Thanks IR ---

But too many areas and we would need to man it 24/7 to insure fans didn't give out

 

[unclesyd]

One thing you might try is cover the edge of scaffold board with some shiny Al or SS weather weather covering.

 

[JStephen]

Consider some steel Grip-Strut-type planking, maybe.

 

[IRstuff]

Overall, if it's not hot enough to fry the workers, the wood can probably handle it.

TTFN

FAQ731-376