Shell-and-tube oestrus exchangers are fabricated alongside circular tubes mounted inwards cylindrical shells alongside their axes coaxial alongside the rhythm out axis. The differences betwixt the many variations ofthis basic type ofheat exchanger prevarication mainly inwards their structure features together with the provisions made for treatment differential thermal expansion betwixt tubes together with shell.
Awidely accepted touchstone is published past times the Tubular Exchanger Manufacturers’ Association (TEMA). This touchstone is intended to supplement the ASME too every bit other boiler together with describe per unit of measurement area vessel codes. The TEMA (1998) touchstone was prepared past times a commission comprising representatives of27 U.S. of America manufacturing companies, together with their combined expertise together with sense render exchangers ofhigh integrity at reasonable cost. TEMA provides a touchstone designation scheme that is summarized inwards together with 6 examples ofthe shell-and-tube oestrus exchanger arrangements are shown inwards Fig. below.
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TEMA touchstone designation scheme for shell-and-tube oestrus exchangers. (From Saunders, 1988, alongside permission.)
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(a) Single-tube-pass baffled single-pass-shell shell-and-tube oestrus exchanger designed to give essentially counterflow conditions. The toroidal expansion articulation inwards the midpoint ofthe rhythm out accommodates differential thermal expansion betwixt the tubes together with the shell. (b) U-tube single-pass-shell shell-and-tube oestrus exchanger. (c) Two-pass baffled unmarried passshell shell-and-tube oestrus exchanger. (d) Heat exchanger like to that of( c) except for the floating caput used to accommodate differential thermal expansion betwixt the tubes together with the shell. (e) Heat exchanger that is like to the oestrus exchanger inwards (d) but alongside a unlike type offloating head. (f) Single-tube-pass baffled single-pass-shell shell-and-tube oestrus exchanger alongside a packed articulation floating caput together with double header sheets to assure that no fluid leaks from 1 fluid circuit into the other. (Courtesy ofthe Patterson-Kelley Co. together with reproduced from Fraas, 1989, alongside permission.)
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