Mechanical Design of Heat Exchangers: And Pressure Vessel by Krishna P. Singh, Alan I. Soler PDF

By Krishna P. Singh, Alan I. Soler

ISBN-10: 3662124416

ISBN-13: 9783662124413

ISBN-10: 3662124432

ISBN-13: 9783662124437

A tubular warmth exchanger exemplifies many elements of the problem in designing a strain vessel. excessive or very low working pressures and temperatures, mixed with sharp temperature gradients, and massive variations within the stiffnesses of adjacent elements, are among the legion of stipulations that behoove the eye of the warmth exchanger dressmaker. Pitfalls in mechanical layout could lead to a number of operational difficulties, comparable to tube-to-tubesheet joint failure, flanged joint leakage, weld cracks, tube buckling, and circulation precipitated vibration. inner mess ups, akin to go partition bowing or weld rip-out, cross partition gasket rib blow-out, and impingement actuated tube finish erosion aren't any much less menacing. Designing to prevent such operational perils calls for an intensive grounding in different disciplines of mechanics, and a large figuring out of the inter­ dating among the thermal and mechanical functionality of warmth exchangers. but, whereas there are many very good books on warmth ex­ changer thermal layout, similar attempt in mechanical layout has been non-existent. This obvious void has been crammed by means of an collection of nationwide codes and criteria, significantly the "ASME Boiler and strain Vessel Code" and the "Standards of Tubular Exchanger brands organization. " those files, at the side of scattered courses, shape the motley compendia of the warmth exchanger designer's reference resource. the subject material in actual fact beckons a methodical and finished therapy. This ebook is directed in the direction of assembly this need.

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Extra resources for Mechanical Design of Heat Exchangers: And Pressure Vessel Components

Example text

The critical regions which behoove careful consideration of thermal transient conditions are: (i) Tube-to-tubesheet joint: In fixed tubesheet heat exchangers, the tubeto-tubesheet joint loads can reach high values (Chapter 9). An expansion joint is sometimes incorporated to mitigate the effect of differential axial growth of the shell and tubes on the tube-to-tubesheet joint. In V-tube heat exchangers, the joint is not loaded as severely. Inner bends, however, can experience unacceptably high axial loads due to differential expansion between the two legs of the V.

The latter construction is cheaper, but removes the facility to unload bonnet and shellside gaskets independently of each other, as noted earlier in the context of U-tube exchangers. The most serious drawback of this floating head design lies in the untubed outer annulus on the tubesheet. The outermost tubes must be inboard of the inside diameter of the floating tubesheet skirt. The outer diameter of the skirt must be less than the effective shell inside diameter (defined as the diameter of the largest perfectly straight cylinder that can be inscribed in the shell).

In all of the design configurations discussed above, the tubesheet is the principal barrier between the two chambers. The joint between the tubesheet and the tubes is often the path of inter-chamber leakage. Designers resort to a "double tubesheet" configuration where mixing between the two flow streams is absolutely unacceptable for safety or for process dependent reasons. For example, if the shells ide fluid polymerizes below a certain temperature, then separating the cold channel from the shell through a double tubesheet device may elevate the shellside tubesheet 13 1/Heat Exchanger Construction VENT-, fSTEAM DE-ENTRAINMENT TUBE SUPPORT :~ .

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Mechanical Design of Heat Exchangers: And Pressure Vessel Components by Krishna P. Singh, Alan I. Soler


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