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Heat Transfer - Conduction down an empty steel pipe

Heat Transfer - Conduction down an empty steel pipe

Heat Transfer - Conduction down an empty steel pipe

(OP)
Help Please!

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 (after cutting out the thinned section), 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 an unlagged 6mm CS and 6" ID.

Any hints or tips will be greatly appreciated.

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