Assembly of the heat exchanger tube bundle and shell

Thread Content

Prerequisites for assembly: The prerequisite for assembling the tube bundle and the shell is that all aspects of shell manufacturing meet the requirements specified in the drawings and standards; for example, the welds must pass non-destructive testing or have been repaired to meet the required standards, and all welds within the cylinder must be smoothed out； All tasks related to the fabrication of the tube bundle have been completed; the gaps in the baffle plates meet the requirements specified in the drawings, and any machining burrs have been removed. The sealing surface must be thoroughly cleaned. Assembly sequence of U-tube heat exchanger: (1) Place a gasket on the shell-side flange sealing surface. O-shaped and octagonal steel washers can be stuck together with grease ； Coiled or composite wave-shaped gaskets are generally secured to the flange bolt holes using polytetrafluoroethylene tape. (2) When installing the tube bundle, prevent deformation of the bundle and scratching of the heat exchange tubes. (3) Install the test pressure ring and tighten the bolts in preparation for shell-side pressure testing. (4) Shell side pressure testing. (5) Install the tube box. (6) Piping pressure test. Assembly sequence for floating-head heat exchangers: (1) Place sealing washers on the shell-side flange sealing surfaces; the method is the same as that used for placing U-shaped shell-side washers ； (2) Pass through the tube bundle ； (3) Install special pressure testing tools for floating heads, and fix the pressure testing ring on the tube sheet side to prepare for shell-side pressure testing ； (4) Shell side pressure testing ； (5) Remove the special pressure testing tools for floating heads, and install the floating head covers and tube boxes ； (6) Piping pressure test ； (7) Install the convex head (large end cap) ； (8) Shell side pressure testing.