Auxiliary Boiler (Oil-Fired) · Boilers
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| Boiler water chemistry test | daily to weekly per the class-approved treatment programme |
|---|---|
| Blowdown (bottom and surface) | daily or per watchkeeping routine |
| Safety valve function test | at each survey or per class requirement, typically annually |
| Burner nozzle cleaning/replacement | per running hours and fuel quality, commonly 500-1500 h |
| Internal inspection (fire-side and water-side) | annually or at the class survey interval |
| Low-water alarm/cut-out test | monthly and before each start after lay-up |
Typical intervals for this design class, not the manufacturer’s figures for your model. The manufacturer’s manual is binding.
| Furnace/fire-side tube wall thickness | condemning limit is boiler-specific per class rules and original design thickness - confirm against the boiler's class-approved thickness gauging record |
|---|---|
| Safety valve set-pressure drift | acceptable tolerance is typically within a few percent of set pressure per class rules - confirm against the valve's certificate |
Ranges are typical for this design class. Always confirm against the manufacturer documentation for your serial number.
Boilers are subject to periodical survey (internal and external) under the applicable class rules, including safety valve testing, thickness gauging where required, and confirmation that the water treatment log and blowdown records are being maintained.
Estimated lifetime: Marine auxiliary oil-fired boilers of this size are typically designed for a 20-25 year vessel life with tube renewals and periodic retubing as needed; actual longevity depends heavily on water treatment discipline and fuel quality.
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