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roker (Chemical)
1 Feb 08 2:06
Hello all,
It is "common practice / conservative design" not to use u-tubes for potential fouling fluids like atmospheric residue from crude distillation, in the thermal design it is considered by the fouling factor.
What are the reasons not to use u-tubes? since the flow in the U part is in same velociy, on the other hand there are now techniques to clean fouled u-tubes (see CONCO and others).
Thanks for advise.
Regards,
roker
gr2vessels (Mechanical)
1 Feb 08 21:31
roker,
The common practice and conservative engineering approach will remain always valid, particularly when the consequences of failure are considerable. However, the conservative engineering practice does not exclude U-tubes in fouling service, provided careful design is applied. If the consequence of blocked/fouled tubes in the exchanger would only be an additional outing for cleaning (and you have the confidence that your cleaning process gives an acceptable run between outages), the U-tubes are fine. Remember, mechanical cleaning can be applied for straight tubes, not U-tubes. 字串1
cheers,
gr2vessels
roker (Chemical)
2 Feb 08 2:54
gr2vessels,
thanks,
please see link for cleaning u-tubes:
http://www.concosystems.com/tubecleaners.php?tcleaners=ConcoUTubeCleaners
regards,
roker
gr2vessels (Mechanical)
3 Feb 08 20:49
Obviously, if the Conco system provides acceptable cleaning, the U-tubes are OK in your application. I have never used this "cleaner" before, but seems to be effective at work. I also hate to think of plugging a U-tube because of a tube cleaner stuck in the bend..
cheers,
gr2vessels
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