Inserting Floating Head Bundle into Shell

[Mechinspqoal]

Hello everyone,

I have a question about the assembly activites of a heat exchanger which has a floating head tube bundle. Tema type is BES for an example and the length is over 6m. First we pull the bundle, than cleaning and inspections are done for both the bundle and the shell. Next we insert (push) the bundle with using bundle puller. The thing is after the insertion we see some turning on the floating head side, it turns around 5°-10°. Basically it looks all good from the view of the fixed tubesheet side but it looks it turned from floating head side. Is it normal or any idea how to prevent this?

Thank you so much.

 

[r6155]

try to pull instead of push.

Regards

 

[CuMo]

Does your bundle have runner/sliding bars?
Are they setup in the baffles correctly? Usually they are setup proud of the baffle edge by 1.5 mm.
Did you check it for twisting before insertion? Because this might have happened during initial assembly too.
Otherwise you might have something in the shell which is making it twist during insertion.
If the shell isn't straight and some of the baffles are catching the whole bundle can flex as a result. Bundle extractors can be very powerful so could easily do this.
Is it possible to run a dummy bundle through the shell?
You can extract the bundle and survey for deep cuts or marks, areas of forced contact...