Auxiliary Boiler (Oil-Fired) · Boilers
Alfa Laval Aalborg-XW-A1 exhaust gas economizer (exhaust gas economizer, small auxiliary). Evaporation 400 kg/h, design pressure 10 bar, heating surface 12 m2, weight 1800 kg. Recovers waste heat from main engine exhaust for steam generation.
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| Soot blowing | typically each watch or per running hours as fuel quality dictates |
|---|---|
| Feed water chemistry check | typically weekly, or per the class-approved water treatment programme |
| Safety valve testing | typically annually or per class requirement |
| Internal tube inspection | typically at drydock or annual survey, more frequently if fouling/corrosion is suspected |
| Water level alarm/cut-out test | typically monthly or per maker's schedule |
Typical intervals for this design class, not the manufacturer’s figures for your model. The manufacturer’s manual is binding.
Boilers and exhaust gas economizers above the class pressure/size threshold typically fall under boiler survey requirements (internal/external examination, safety valve testing, hydrostatic test after major repair); soot fire incidents are a common finding class surveyors specifically ask about.
Estimated lifetime: Exhaust gas economizers of this size commonly remain in service 15-25 years with proper water treatment and soot management; tube bundles are sometimes renewed once during a vessel's life if fouling or corrosion has been poorly controlled.
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