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There are other types of seawater cooler cleaning cases, covering different equipment types and cleaning technologies. The following are typical examples.: 1. Case of biofouling cleaning of ship central cooler: A Hong Kong-registered bulk carrier "N" experienced an abnormal increase in the fresh water temperature of the main engine during navigation. After investigation, it was found that the central cooler was blocked by small fish, seaweed and other organisms. The crew dismantled the cooler at the anchorage and used high-pressure water jets (80 MPa) to flush the plates layer by layer to remove large amounts of organic matter deposits. After cleaning, the system pressure difference returned to normal and the heat exchange efficiency returned to the design value. This case highlights the risk of "uninvited guests" entering the system due to failure of the front-end filter. It is recommended to install a backwash filter to prevent similar problems. 2. A pickling case of a titanium tube seawater cooler in a petrochemical plant. The titanium tube seawater cooler of an ethylene unit in a petrochemical plant was chemically cleaned with 10% nitric acid + 0.5% hydrofluoric acid + solid corrosion inhibitor due to silicon-containing iron oxide scale deposited on the shell side. Although it is effective in removing rust and scale, HF causes slight corrosion to the titanium tube, and the tube wall becomes thinner after repeated cleaning. The subsequent optimization plan is to control the pickling time