Problems with the fixation of internal components in heat exchangers (baffles, tie rods, spacers)
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As specified in Figure GB151, when the diameter of the heat exchange tubes is greater than 19, threaded connections are used for the tie rods, and spacers are employed to ensure the correct position of the baffle plates. There are several questions regarding this; please help answer them. For vertical heat exchangers: 1. Is it necessary to weld the baffle plates to the inner wall of the heat exchanger tank? 2. Is it necessary to weld the areas where the spacers come into contact with the tube sheet and baffle plates? 3. Is it necessary to weld the tie rods to the baffle plates? Another question: According to standard 151, the outer diameter of the spacers should be similar to that of the heat exchange tubes. I am using heat tubes with an outer diameter of 57 mm and tie rods with a diameter of 16 mm; using spacers with a diameter of 57 mm seems a bit large. Is it possible to use spacers with a smaller diameter? I am considering using spacers with an outer diameter of 32 mm. Please share your thoughts and answers
1. Baffles and the inner wall of the heat exchanger shell usually do not require welding. They are fixed to the cylinder body using other fixing methods (such as clamping or threaded connections), but the specific method depends on the design and operating conditions. 2. The areas where the spacing tube comes into contact with the tube sheet and baffle plates generally do not require welding. The spacing tube is primarily used to maintain the relative position of the tie rod and the heat exchange tubes, preventing displacement during operation. 3. Welding is generally not required between the tie rod and the baffle. The tie rod is connected to the baffle through threaded connections and/or other fasteners such as nuts and washers. Regarding the issue of spacers, although GB151 specifies that the outer diameter of spacers should be the same as that of the heat exchange tubes, in practical applications, spacers of different diameters can be chosen depending on specific requirements, provided that the structural strength and stability requirements are met. Using a tube with an outer diameter of 32 mm as a spacing tube is theoretically feasible, provided that calculations and practical applications show it can meet the requirements. However, it is best to conduct appropriate strength and stability tests or consult the designer/manufacturer. .
No need, the pull rod outer sleeve is already positioned.