"> Alfa Laval S.p.A. Aalborg-XW-A19-7bar
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Alfa Laval S.p.A.

Aalborg-XW-A19-7bar

The Alfa Laval S.p.A. Aalborg-XW-A19-7bar is an exhaust gas economizer in the Aalborg XW family for recovering waste heat from diesel-engine exhaust gas. It is normally installed in the main-engine exhaust path and connected to the ship's steam-and-water system, commonly through an auxiliary boiler or separate steam drum. The XW design uses water tubes with forced circulation and extended gilled heating surfaces to transfer exhaust heat into the circulating boiler water. Its available heat recovery follows engine load, exhaust-gas temperature and the cleanliness of the heating surfaces rather than a directly controlled burner input. The 7bar suffix identifies this pressure-labelled variant of Aalborg-XW-A19; the exact design and working pressure limits must be confirmed from the manufacturer documentation. Reliable circulation, correct boiler-water chemistry and effective gas-side cleaning are central to safe and efficient operation.

Alfa Laval S.p.A. Aalborg-XW-A19-7bar

Components & Design

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Technical Data

Model number Aalborg-XW-A19-7bar
Evaporation 32500 kg/h
Design pressure 7 bar
Weight (dry) 44000 kg
Application exhaust gas economizer, VLCC
Heating surface 430 m2
Standards EU PED 2014/68/EU, classification by IACS members
Design pressure (configured) 7 bar
Pressure grade 7bar

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Common failures & inspection points

●Soot and oily deposit accumulation caused by incomplete combustion or prolonged low-load operation, indicated by reduced steam production or increased exhaust-gas resistance
●Restricted water circulation caused by pump faults, blocked piping or incorrect valve position, indicated by unstable temperatures or reduced heat recovery
●Tube leakage caused by corrosion, erosion, deposits or thermal stress, indicated by abnormal water consumption or moisture in the exhaust-gas path
●Water-side scaling caused by inadequate treatment, indicated by deteriorating heat transfer or local overheating
●External leakage or casing corrosion caused by degraded seals, condensation or environmental exposure, indicated by visible water or steam leakage, staining or wastage

Service & Maintenance

Inspect gas-side heating surfaces for soot, oil residue and corrosion, and verify that the installed soot-cleaning arrangement is effective. Check circulation pumps, valves and piping for reliable unobstructed flow. Examine accessible tubes, headers, casing, supports and expansion arrangements for leakage, cracking, corrosion and signs of overheating. Review boiler-water treatment records and investigate abnormal make-up-water consumption. Verify relevant pressure and temperature indication, alarms and protective functions. Refer to the manufacturer documentation for exact inspection criteria, test pressures and acceptance limits.

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Replacement Parts

Carry suitable gaskets and sealing materials for accessible joints, service parts for the circulation pump and associated valves, and common pressure and temperature instrumentation spares used by the boiler system. Keep consumables and wear parts for the soot-cleaning equipment where fitted. Approved tube-repair materials may be carried only where permitted by the manufacturer, class and the vessel's repair procedures.
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Equipment Model #153552 · ✓ still in production