RE: Shell and tube Heat exchangers

From: <Michael>
Date: Thu Jul 01 2004 - 21:17:00 EDT

Hi Steve:

Thanks. I am familiar with "spiral tube units", are these the same? With those, I would agree that expansion would be much less of an issue. Dare I ask how these are built?

I want to build a straight shooter, with 3/4" SS316L, polished. Mine is basic or much like a normal HE, but some changes.

  I used to work for a large beverage outfit here in Florida, and they had fairly large units, about 6" Dia for each tube. We would experience cracks right at the welded end and we used a florescent green dye to detect them. It's that joint of the tube and the plate weld that has been bugging me. I have been looking at different designs for some ideas.

Appreciate your comments.

Mike Waugh

-----Original Message-----
From: Steve McKenzie <mechproj@xtra.co.nz> Sent: Jul 1, 2004 6:31 PM
To: <a href="/group/PipingDesign/post?postID=U4tfhrNrtlaS-bqZ6aMC6cLObWoxgai1FIyaxy55p0e2W4Ohw4MHYxjvpsjb0ke78X6Au10kV5yRXg0DxG9tX7qobGs">PipingDesign@yahoogroups.com</a> Subject: RE: [PipingDesign] Shell and tube Heat exchangers

Hi Mike
some dairy installations use tube-in tube exchangers for ease of cleaning. By using a serpentine pattern, expansion can be easily accommodated.
Before designing you may want to see whats currently available so you can either "borrow" the best ideas or just buy what you need. APV and Alfa Laval make some good stuff in the dairy industry.

Cheers

Steve

-----Original Message-----
From: mikebw_99 [mailto:mike@waudesign.com] Sent: Friday, July 02, 2004 3:02 AM
To: <a href="/group/PipingDesign/post?postID=U4tfhrNrtlaS-bqZ6aMC6cLObWoxgai1FIyaxy55p0e2W4Ohw4MHYxjvpsjb0ke78X6Au10kV5yRXg0DxG9tX7qobGs">PipingDesign@yahoogroups.com</a> Subject: [PipingDesign] Shell and tube Heat exchangers

Greetings

Anybody with information on design of heat exchangers? I am starting out on a design, I am seeking some technical information, literature or any other guidance on how to correctly determine the innner shell tube lengths for a sanitary shell and tube heat exchanger(tubes to be built into a bundle). I would like to better understand thermal expansion effects and properties, stress related effects on welded ends, in order to prevent bending of the tubes. These tubes would be welded into end plates and specifying the welds to stop leaks is a concern.

Mike W

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