Aalborg-OS-TCi-14-7bar

Common issues

• Burner flame instability or failure to ignite, often from atomizer wear or fuel viscosity issues
• Soot and scale buildup on fireside/waterside heating surfaces reducing efficiency
• Tube or drum seam leakage from corrosion or thermal fatigue
• Water level control malfunction leading to low-water trips or false alarms
• Safety valve drift from set pressure or seat leakage
• Refractory cracking or spalling around the burner throat
• Feed water quality excursions causing scale or caustic attack
• Economizer (if fitted downstream) fouling reducing overall steam output

Inspection checklist

• Check safety valves lift at the certified set pressure and reseat tight
• Verify water level gauge glasses and low-water alarm/cutout function
• Inspect burner flame pattern, atomization quality and ignition reliability
• Check refractory condition around burner throat and furnace
• Review feed water treatment log and TDS blowdown records
• Inspect main steam stop valve for tight shut-off
• Check soot blower coverage and operation if fitted
• Inspect manhole/handhole door gaskets for leakage
• Check boiler mountings, insulation cladding and casing for hot spots
• Confirm flame failure and combustion air interlocks trip correctly

Service intervals

Typical wear limits

Ranges are typical for this design class. Always confirm against the manufacturer documentation for your serial number.

Critical spares

• Burner atomizer/nozzle
• Ignition electrodes
• Flame scanner
• Safety valve spring and seat set
• Water level gauge glass set
• Feed check valve
• Manhole/handhole door gasket set

Safety

• Pressurized steam and hot surfaces - severe burn risk during operation and cool-down
• Low-water condition can cause overheating and boiler failure - low-water cutouts are safety-critical
• Furnace/firebox explosion risk if the combustion chamber is not purged before re-ignition
• Heated fuel oil under pressure at the burner - fire and burn hazard
• Confined space entry required for internal inspection - test atmosphere and follow permit procedure

Class survey

Auxiliary boilers are Continuous Survey Machinery items with internal and external examination required at each Special Survey; safety valve accumulation and set-pressure tests, plus a hydraulic test after major repair, are typically required and must be documented with test certificates retained on board.

Estimated lifetime: Well-maintained marine auxiliary boilers of this type typically serve 20-25 years; tube bundles and burner components are renewed on shorter cycles within that life.