276°
Posted 20 hours ago

Trater

£9.9£99Clearance
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About this deal

In the nineties TRATERhas developed technologies for the treatment of heat exchangers previously described(TECHNOLOGIES o HEAT EXCHANGERS?) able to reduce and, in most cases, cancel all of the indicated(MENTIONED) problems. The geometrical distortions can make impossible the insertion of the bundle into the shell and reduce the thermal efficiency of the heat exchanger, while the residual stresses can expose the item to serious damages during operation.

In particular, the elongation of the shell during the heating phase, since it is not together with (MANCA UN VERBO - WELDED?)the tubes, can cause the deformation of the tube-sheets, the collapse of the welds between tube and sheet and/or the stretching (saldature tubo-piastra e/o lo stiramento) of the tubes; the local upsets (ricalcature locali) of the material will surely correspondto tensile stressed zones (zone sollecitate a trazione) after the heat treatment. In many cases, it is necessary to treat the entire tube bundle of an exchanger with "U" tubes or a floating tubesheet. During the treatment, the shell of the exchangers heats and cools up easily because it is touched by the turbulent gasesgenerated by the burners, whilethe tube bundle, closed in the shell (in a firm environment, without direct heat supply, if not per natural convection which determinates a stratification of the air), heats and cools up much more slowly, generating big differences in the temperature of the item. Furthermore, the consequences ofoxidative processes onboth internal and externalsurface of the tubes are not to be underestimated due to the influence in (DURING THE)service of the exchanger (pollution of the process products and reduction of the heat exchange) and due to the generation of exothermal heat, proper of oxidation phenomena.

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