tubesheet design temperature

[KarimElsaadany]

Hello Everyone,

I've got a simple question, is the tubesheet in HP feedwater heaters subjected to superheated steam from the shell side?

 

[Dhurjati Sen]

No, the steam you get in the shell side is not superheated yet!

DHURJATI SEN

 

[EdStainless]

Yes, the HP heaters have superheated steam on the shell side at the inlet.
That is why the first section is called 'de-superheater'.
In every one that I have seen they have added baffling so that the steam cannot directly impinge on either the tubes or the tubesheet.

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P.E. Metallurgy, Plymouth Tube

 

[georgeverghese]

Obviously the tubesheet design temp must be the same as shellside design temp..

 

[KarimElsaadany]

Yes I understand that there is a desuperheating zone, my question is whether the tubesheet should be designed based on the saturated temp. of steam or the superheat temp.