Heat Dissipation Rates 3

[sigma1]

We have to support the riser of an exhaust for an Emergency Generator at a temperature of 1000 F and we are planing to use a stanchion under the bottom elbow. However, I am concerned about the heat transfeer from the exhaust to the pipe stanhion and to the structure. Does any one know how to calulate the heat dissipation and therefore determine the length of the pipe stanchion which will be insulated for personal protection?

Thank you

 

[AbbyNormal]

If the supports are connected to a non combustible wall I would not worry about it.

Does the stack go up and clear over hanging eaves?

Take the "V" out of HVAC and you are left with a HAC(k) job.

 

[zekeman]

To test this, put a torch at the end of a similar pipe held vertically and "feel" the temp at a distance from the source. If the stanchion is steel,the temperature will dissipate rapidly.

 

[AbbyNormal]

I did some remote gen stations up by James Bay before, I looked at the drawing, Critical silencer was about 10 inches off a wall. The silencer was the 90 dgeree bend up.

A lot of emergency standby gens here, last job was a pair of 1000kW prime, dual exhausts, I made a metal heat shield with stand off spacers for an air space behind, where it was near the eaves so it would not radiate on a roofing membrane, but no problems otherwise for a non-combustible wall.

Take the "V" out of HVAC and you are left with a HAC(k) job.

 

[Mike2468]

If the stanchion is stainless steel,the temperature will dissipate even more rapidly. Stainless is a poor conductor of heat.

 

[atlas06]

Specify pipes with min of 2" calcium cilicate insulation.