Heat Transfer Down an Empty Steel Pipe
Heat Transfer Down an Empty Steel Pipe
(OP)
Help!
I need to calculate the heat transfer down a steel pipe, any ideas on how to do this please?
We are replacing a section of line, using a Stopple and bypass. The steel line contained a Hydrogen rich stream and where the new flanges are to be welded, the line requires a Hydrogen bake-out before welding.
Due to space constraints there is only 700-750 mm between the stopple and bake-out heating element. How do I work out if the heat from the bakeout will reach and effect the integrity of the stopple?
The heat will be applied using 2 x 6" wide 45 Amp, 65 volt heating elements at a temperature of 400 C. the pipe is 6mm CS and 6" ID.
Any hints or tips will be greatly appreciated.
I need to calculate the heat transfer down a steel pipe, any ideas on how to do this please?
We are replacing a section of line, using a Stopple and bypass. The steel line contained a Hydrogen rich stream and where the new flanges are to be welded, the line requires a Hydrogen bake-out before welding.
Due to space constraints there is only 700-750 mm between the stopple and bake-out heating element. How do I work out if the heat from the bakeout will reach and effect the integrity of the stopple?
The heat will be applied using 2 x 6" wide 45 Amp, 65 volt heating elements at a temperature of 400 C. the pipe is 6mm CS and 6" ID.
Any hints or tips will be greatly appreciated.





RE: Heat Transfer Down an Empty Steel Pipe
Assuming the pipe inner wall is not exchanging (but you can use a fan to recirculate some air), and if my numbers are correct, you get n=√(hP/kA)=5.7 m-1. This means that in only 1/5.7=0.17 m = 170 mm the temperature difference with respect to ambient is reduced to about 1/3, and that at 700 mm distance the temperature increment is of a few degrees.
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RE: Heat Transfer Down an Empty Steel Pipe
Great advise!
RE: Heat Transfer Down an Empty Steel Pipe