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Alfa Laval S.p.A.

ACH900-180P

The Alfa Laval S.p.A. ACH900-180P 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 180P 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.

Components & Design

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Technical Data

Model number ACH900-180P
Plate count (min) 10 plates
Plate count (max) 218 plates
Max flow rate 481.6 m3/h
Design pressure 45 bar
Application high-pressure refrigerant heat pump, AC and refrigeration
Plate material Stainless steel (AISI 316)
Brazing material Copper
Plate count (configured) 197 plates
Effective flow rate at duty point 481.6 m3/h
Configuration 180P configuration

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Common failures & inspection points

●Internal fouling caused by contaminated water, oil or process fluid, indicated by reduced heat-transfer capacity and increasing pressure drop
●Flow restriction caused by debris, deposits or blocked upstream strainers, indicated by low flow and abnormal operating pressures or temperatures
●External leakage at connections or brazed joints caused by corrosion, vibration or piping stress, indicated by visible fluid, oil traces or loss of refrigerant charge
●Internal cross-leakage caused by plate or brazed-joint failure, indicated by contamination between circuits or unexplained loss from one side
●Freeze damage in evaporator or chilled-fluid service caused by inadequate flow or control malfunction, indicated by sudden leakage or loss of pressure integrity
●Refrigerant maldistribution or unstable control caused by system-side faults, indicated by fluctuating superheat, capacity or discharge conditions

Service & Maintenance

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.

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Replacement Parts

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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Equipment Model #153748 · ✓ still in production