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(6) Change the heat pipe. (7) The overall replacement of the bundle shall be in accordance with GB1511999 (steel tube shell type heat exchanger) or the design drawings. (8) Perform shell repair according to SHS01004-2004 "Rule of Maintenance and Repair of Pressure Vessels". (9) Select the replacement of sealing gasket according to the design requirements. (10) When it needs to replace the bolts and nuts of heat exchangers, we should select them according to the design requirements and then tighten heat exchanger bolts generally in the order shown in FIG. 2-25 and apply appropriate thread lubricant or anti-bite mixture.

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Commonly used cleaning methods are air sweeping, water washing, steam washing, chemical cleaning and mechanical cleaning. How does the surface structure of the heat exchange tube affect the heat exchange result? Use specially designed surface structure of heat exchange tubes, such as finned tubes, nail head tubes, threaded tubes, etc. On the one hand, the heat transfer area becomes increased; on the other hand, the turbulence effect of the special surface greatly increases the degree of turbulence of the fluid outside the tube. Both aspects can improve the overall heat exchange effect of the heat exchanger, so these surface structures are superior to the smooth tube surface. What methods we commonly use for descaling the surface of heat exchange tubes? The common methods of descaling the surface of heat exchange tubes are: manual brazing descaling, mechanical descaling, pressure water descaling, chemical descaling, ultrasonic descaling, etc. What are the methods to prevent scale on the surface of heat exchange tubes? (1) Nickel and phosphorus plating (2) Chemical coating and 847 coating (3) Install ultrasonic scale inhibitor in cold water pipeline.