By Krishna P. Singh, Alan I. Soler
A tubular warmth exchanger exemplifies many facets of the problem in designing a strain vessel. excessive or very low working pressures and temperatures, mixed with sharp temperature gradients, and big ameliorations within the stiffnesses of adjacent components, are among the legion of stipulations that behoove the eye of the warmth exchanger fashion designer. Pitfalls in mechanical layout could lead on to a number of operational difficulties, resembling tube-to-tubesheet joint failure, flanged joint leakage, weld cracks, tube buckling, and movement precipitated vibration. inner disasters, reminiscent of go partition bowing or weld rip-out, move 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 a radical grounding in different disciplines of mechanics, and a huge figuring out of the inter dating among the thermal and mechanical functionality of warmth exchangers. but, whereas there are various first-class books on warmth ex changer thermal layout, similar attempt in mechanical layout has been non-existent. This obvious void has been stuffed via an collection of nationwide codes and criteria, particularly the "ASME Boiler and strain Vessel Code" and the "Standards of Tubular Exchanger brands organization. " those records, along with scattered courses, shape the motley compendia of the warmth exchanger designer's reference resource. the subject material basically beckons a methodical and entire remedy. This e-book is directed in the direction of assembly this need.
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Additional resources for Mechanical Design of Heat Exchangers: And Pressure Vessel Components
F- . _ . - ! II ~ ~ PASS PARTITION PLATE) r--r-lo. - r·_·Fig. 2. C Ii I J Alternate pass partition arrangement (two pass). 004 wTHK. S. STRIP (FULL HARD TEMPER) W Fig. 3. Typical longitudinal baffle edge seal detail. g. Half-completed bundle of a six-shell pass, 12-tube pass heat exchanger. ) 22 Mechanical Design of Heat Exchangers Fig. 4. Horizontal cut single segmental baffle layout. SOLID BAFFLE o Fig. 5. Double segmental baffles. I I ----4- - - - - - - - - - BAFFLE-A BAFFLE- B BAFFLE-C Fig.
This fact limits the use of 60°, and to some extent 45 ° layouts, in practical designs. W 30· LAYOUT "f~ 60· LAYOUT Fig. 1. ¢:l FLOW G-Q Q Q 'CD (9---0 -0/ 90· LAYOUT Tube layout schemes. h. Views showing baffle cages and shells with expansion joints. ) Square and rotated square layouts permit convenient cleaning of the tube external surfaces. For this reason, they are widely used in the petrochemical and dairy industries where fouling of the tube surface is an endemic problem. 6 GENERAL CONSIDERATIONS IN PASS PARTITION ARRANGEMENT It is apparent from the foregoing that the designer has several options in the selection of the pass partition arrangement scheme.
Passes· (Fig. 3). Its effect on the shellside chamber is similar to that of the tubeside plate on the tubeside chamber. It is desirable to weld the long edges of the shellside pass partition plate to the shell. However, it is not always possible to do so. For instance, if the V-bundle heat exchanger has two tube passes, as in Fig. 3, then welding the longitudinal pass partition plate would trap the tube bundle in the shell. In such cases, the pass partition plate is equipped with suitable edge seals to prevent leakage across the pass partition plate.
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