Gordon,
Very well said! Thanks.
C. V. Gangadharan.
--- Gordon.Reddek@Alcan.com wrote:
> Mohamed,
>
> I have has to make a few assumptions about the type
> of exchanger you are
> talking about. I hope I got it right.
>
> The heat exchanger is generally a long vessel, and
> the tubes and the shell
> will have different temperatures (otherwise it would
> not be a heat
> exchanger) so obviously if you clamp the shell and
> the tubes together at
> both ends they will put each other under strain.
> The hot component (shell
> or tubes) will go into compression and the cold one
> into tension. That is
> particularly bad for the tubes because they are
> often held in place by
> frictional grip alone. There is no sense in putting
> those joints under
> longitudinal stress. There is also no sense in
> putting the shell or the
> tubes under unnecessary stress. That is solved by
> not connecting the tube
> bundle to the shell at both ends. One end of the
> tube bundle is allowed
> to move freely in the longitudinal direction within
> the shell. They
> normally call that end the FLOATING end. The other
> end is just about
> always fixed and I think it is this fixed end you
> are talking about.. This
> arrangement still has to be made to work however in
> that it must be
> possible to connect a pipe to the inlet of the tube
> side and also to the
> outlet of the tube side. This can not be done on
> the floating end because
> it is floating around within the shell. This is
> solved by dividing the
> tube bundle into two distinct sections and making
> the two pipe connections
> on the fixed side of the tube bundle only. The
> fluid enters one half of
> the tubes on the fixed side, flows to the floating
> end where it is routed
> into the second half of the tubes. It then flows
> back to the fixed end
> where there is a second nozzle to discharge it. The
> fixed end is normally
> called the channel because in section it has the
> shape of a channel. This
> channel has the triple purpose of 1) clamping the
> tubeplate of the tube
> bundle to the shell (thus fixing it) 2) dividing the
> tube bundle into two
> so that the fluid can flow to and from the floating
> ends in separate
> sections. That is done by installing a divider
> plate in the channel. 3)
> providing a fixed place to install the inlet and
> outlet nozzles to the
> tube bundle. The inlet to the bundle is located on
> one side of the divider
> plate, the outlet is on the other side.
> So you can see the channel end is the end where all
> the action takes
> place. Where the tube side nozzles are located,
> where the tube bundle is
> fixed and obviously where the tube bundle can be
> removed. That is simply
> how the exchanger is designed.
> Other contributors have mentioned the fixing of the
> exchanger to the
> foundation. That is also an issue and I would
> normally expect the
> exchanger to be fixed to the foundation at the
> channel end as well. As
> you undoubtedly know, pipes expand when they get hot
> and one needs to
> control the movement of the points where they
> terminate. Generally it is
> better for the end points to be fixed and not moving
> around stretching and
> compressing the connected pipes. The channel has
> two nozzle attached and
> at least one nozzle on the shell side will be close
> to the channel. It is
> generally a good idea to fix that end of the shell
> to the foundation and
> to allow the other end of the shell to slide over
> the foundation to
> accommodate thermal expansion. That arrangement
> normally places minimum
> strain on three of the four pipes attached to the
> exchanger.
> The above is a description of a floating end shell
> and tube exchanger.
> There are a number of other arrangements that are
> common. If you can lay
> hands on a copy of the TEMA standard (of the Tubular
> Exchanger Manufacturers Association ) you will find
> details of just about every arrangement in common
> commercial use.
>
> Salaam
>
> Gordon Reddek
>
>
>
> I
>
>
>
>
>
> "Mohamed Bharuk M."
> <m.mohamedbharuk@saipem-india.com>
> 20/03/2004 03:33 PM
> Please respond to PipingDesign
>
>
> To: <PipingDesign@yahoogroups.com>
> cc:
> Subject: RE: [PipingDesign] cyclone
> separator
>
>
> Dear all
> please tell me why in case of heat exchanger , the
> side in which tube
> bundle is removed is normally fixed
>
>
>
> M.Mohamed Bharuk
>
> -----Original Message-----
> From: <a href="/group/PipingDesign/post?postID=Kz88dLH7uhlE8hohrL7kkVeiDbwnTXNnufhsz-RgUZ6HYwyE14nsVjTC-vnCSVgU4gurKv71sRz76XdW">ABDUL__WASAY@ril.com</a>
> [mailto:ABDUL__WASAY@ril.com]
> Sent: Saturday, March 20, 2004 8:48 AM
> To: <a href="/group/PipingDesign/post?postID=wenXhvcEITNe68puIwyNjnFcvdrOI4A3kh88JUpzSRfKprVy8m7IoPR9kDkyI4xIYb6Fix19u3AS8oY00uj3EmSVqn0">PipingDesign@yahoogroups.com</a>
> Subject: [PipingDesign] cyclone separator
>
>
>
>
>
>
>
> hi!!!
> Iam wasay
> Can anyone give me detail (function ) of a Cyclone
> seperator and also its
> scope.
>
> regards
> Abdul Wasay
>
>
>
>
>
>
>
>
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