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AXP27-MAX

Central Cooler (Plate Type) · Heat Exchangers

Class-certified type (DNV register) · technical data sheet not yet verified

Alfa Laval AXP27-MAX fusion-bonded all-stainless plate heat exchanger (fusion-bonded all-stainless). Plate count 16-200, max flow rate 110.0 m3/h, design pressure 48 bar. AlfaFusion technology — no copper or nickel; ideal for ammonia, freshwater and CO2 applications.

Specifications

Technical data.

Every value below comes from the manufacturer datasheet or class-society record on file for this model.

Heat Exchanger TypeAlfa Laval Gasketed Plate Heat Exchangers (GPHE)
Related models

Also in Central Cooler (Plate Type).

Other models of the same equipment type, Alfa Laval S.p.A. first.

Inspection

Inspector Detail

Common issues

  • Fouling/scaling on the seawater side reducing heat transfer efficiency
  • Marine growth/biofouling in the seawater circuit
  • Erosion-corrosion at high-velocity inlet areas on the seawater side
  • Reduced flow from partial blockage, since the fusion-bonded plate pack cannot be mechanically opened for cleaning
  • External flange/connection leakage at pipe interfaces
  • Freshwater/glycol chemistry degradation affecting corrosion protection on the fresh water side

Inspection checklist

  • Monitor approach temperature and pressure drop trend on both circuits against the commissioning baseline
  • Inspect strainers/filters upstream on the seawater side
  • Check external flange connections and gaskets for leakage
  • Review seawater treatment/anti-fouling dosing operation, where fitted
  • Check freshwater circuit chemistry/inhibitor concentration
  • Inspect support/mounting structure for vibration wear
  • Verify pressure relief/safety devices on the circuit are functional and within test date
  • Check insulation condition where fitted

Service intervals

Strainer cleaningmonthly or per observed fouling rate
Performance trend review (pressure drop/approach temp)quarterly
CIP chemical cleaning of the plate packcondition-based, when performance degrades - per Alfa Laval CIP guidance for AlfaFusion units
Freshwater treatment/inhibitor checkmonthly
External leak/visual inspectionat each engine room round

Critical spares

  • Complete replacement unit or plate pack cartridge - fusion-bonded packs are not field-rebuildable like gasketed units; confirm the specific service concept with Alfa Laval
  • External flange gaskets/O-rings
  • Strainer elements
  • CIP cleaning chemicals
  • Pressure relief valve, where fitted to protect the 48 bar rated circuit

Safety

  • High design pressure (48 bar) - strict isolation/depressurization procedure required before any work on connections
  • Pressure testing hazards
  • Chemical handling during CIP cleaning
  • Ammonia handling precautions apply if the unit serves an ammonia-adjacent circuit

Class survey

Central coolers serving essential systems are surveyed as part of Continuous Machinery Survey. Surveyors check pressure test/relief valve certification given the 48 bar design pressure, external condition, absence of leakage, and that the installation matches the approved cooling system diagram, including the duty/standby arrangement if fitted.

Estimated lifetime: All-stainless fusion-bonded coolers of this type are generally designed for a long service life, often quoted in decades, given their corrosion-resistant construction - provided water chemistry is controlled and the unit stays within its design pressure/temperature envelope. Confirm against Alfa Laval's documentation for the AXP27-MAX.

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