Auxiliary Boiler (Oil-Fired) · Boilers
Alfa Laval Aalborg-XS-TC7A-16bar compact exhaust gas economizer (compact exhaust gas economizer). Evaporation 4800 kg/h, design pressure 16 bar, heating surface 100 m2, weight 9800 kg. Compact, vertically-mounted exhaust-gas waste heat boiler.
| Soot blowing | daily/per running hours whenever the main engine is running |
|---|---|
| Exhaust gas side inspection | every 4,000-8,000 running hours or at each class survey opening |
| Safety valve function test | annually |
| Feed water treatment/TDS check | weekly |
| Internal waterside inspection | at each class survey opening |
| Bypass damper function check | per maker interval |
| Tube wall thickness | class societies require retention of a minimum percentage of original design thickness before renewal - confirm the specific figure against the vessel's classification rules and the Alfa Laval Aalborg manual, do not estimate on board |
|---|---|
| Low-load corrosion | acid dew-point corrosion can locally thin tubes faster than general wear - monitor via UT gauging rather than assuming a uniform rate |
Ranges are typical for this design class. Always confirm against the manufacturer documentation for your serial number.
Exhaust gas economizers are Continuous Survey Machinery items with particular attention to soot fire prevention arrangements; class reviews internal/external inspection records and safety valve certificates, and increasingly requires enhanced inspection for vessels operating extensively at low load due to known cold-corrosion risk.
Estimated lifetime: Exhaust gas economizers on vessels with extensive slow-steaming/low-load operation often need tube renewal within 8-15 years due to cold corrosion; well-operated units with good soot management can reach the vessel's service life with periodic tube renewal.
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