Plate Heat Exchanger · Heat Exchangers
The Alfa Laval S.p.A. ACH70-60P is a brazed plate heat exchanger in the Alfa Laval ACH family for compact heating, cooling and refrigeration duties. It consists of a sealed plate pack in which corrugated metal plates create alternating flow channels for the two media while brazed joints provide structural integrity and separation between the circuits. On board a vessel, units of this type can be installed in refrigeration plants, air-conditioning systems, chillers, heat pumps, oil or water cooling circuits and other packaged thermal systems. In refrigerant service, the selected unit may operate as an evaporator, condenser, economizer or subcooler depending on the system design. The 60P suffix identifies a specific catalogue configuration of the base model; the exact plate count and configuration should be verified from the manufacturer documentation rather than inferred from the designation. Because the plate pack is permanently brazed and is not routinely opened like a gasketed plate heat exchanger, fluid cleanliness, correct flow conditions and suitable chemical cleaning practice are especially important.
What our service work and the manufacturer documentation say about keeping this model running.
Monitor inlet and outlet temperatures, pressures and pressure drop for gradual loss of performance. Maintain upstream strainers and fluid quality because internal mechanical access is limited. Check all external connections and the plate-pack perimeter for leakage, corrosion and vibration damage. Ensure connected piping is adequately supported so that excessive loads are not transferred into the exchanger. In evaporator duties, verify freeze protection, minimum-flow safeguards and refrigerant controls. If chemical cleaning is required, use only methods and agents compatible with the exchanger materials and follow manufacturer instructions.
For critical duties, a complete replacement brazed plate heat exchanger may be more practical than internal spare parts because the plate pack is normally not dismantled. Useful associated spares include connection seals where applicable, strainers or strainer elements, temperature and pressure sensors, control-valve service parts and refrigeration-system control components. Spare strategy should reflect system redundancy and the vessel's trading pattern.
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