Which should be welded first: the heat exchanger tube sheet to the shell, or the heat exchange tubes?
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Which should be welded first: the heat exchanger tube sheet to the shell, or the heat exchange tubes? Thank you. First, determine the positions of the tube sheet and baffle plates. Second, install the tube sections and fix the other tube sheet. Third, insert the tubes. Fourth, weld the tubes. Fifth, weld the tube sections. I think this order is great
Why is the tube section welded last? Should it be welding between tube sections, or welding between the cylinder and the tube sheet? If welding occurs between tube sections and the tube sheet is not used as a flange, generally, the connections between the tube sections are welded first, followed by the welding of the tube body to the flanges. Next, the accessories attached to the tube body are welded to it. Then, the tube bundle (including the tube sheet, baffle plates, spacers, etc.) is installed, the tube bundle is placed inside the tube body, and another tube sheet is fitted over it. Finally, the tubes are inserted and welded in place. If it is a welding between the cylinder and the tube sheet, with the tube sheet also serving as a flange, generally the sections of the cylinder are welded together first, followed by welding the accessories on the cylinder to the cylinder itself. Then the tube bundle (including the tube sheet, heat exchange tubes, baffle plates, spacers, etc.) is installed, and this tube bundle is placed inside the cylinder. Another tube sheet is then fitted over it, and both tube sheets are welded to the cylinder. Finally, the heat exchange tubes are welded to the tube sheet.