30-08-2014, 02:35 PM
mentanence of heat exchanger HEAT EXCHANGER Heat exchangers are process equipment in which heat is continuously or semi-continuously transferred from a hot to a cold fluid directly or indirectly through a heat transfer surface that separates the two fluids. Heat exchangers consist primarily of bundles of pipes, tubes or plate coils. The main purpose of using heat exchanger is may be either to remove heat from fluid or to add heat to fluid. The exchanger was defined as vertical, hot shell-cold tube exchanger It consist of cylindrical steel shell containing a number of straight water tubes. The tubes are expanded into grooves in the tube sheet holes to form vapour-tight fit. The tube sheets are welded to the shell to the both ends the intermediate supports are provided on the shell to avoid sagging of the tubes. It is one of few materials that can withstand temperatures up to 1100 �C. The tubes will also be thicker-walled than standard to contain the high pressures in both streams. In addition to its high temper