Fuel Oil Separator · Separators & Purifiers
Alfa Laval S815-HFO-Purifier high-speed disc-stack centrifugal separator for fuel/lube oil treatment, marine auxiliary, optimised for heavy fuel oil purification. Fuel oil capacity 4400 l/h, lube oil capacity 3520 l/h. Bowl diameter 395 mm, motor power 5.5 kW. Part of the S-series — the current generation marine separators with ALCAP control.
| Seal rings / O-ring set | typically every 4,000-8,000 running hours or at bowl overhaul, often shorter than on MDO duty due to higher operating temperature - confirm against maker's manual |
|---|---|
| Bowl disc stack cleaning | every 250-1,000 hours depending on cat fines content and desludge interval |
| Gearbox oil change | typically every 4,000-8,000 hours or per maker's schedule |
| Major bowl overhaul / bearing replacement | typically every 8,000-16,000 hours - confirm against maker's manual |
| Preheater temperature/viscosity check | each watch during operation |
| Seal ring wear | replace when visibly hardened, cracked, or below maker's minimum thickness - no universal figure, check maker's manual |
|---|---|
| Disc/nozzle erosion from cat fines | any measurable pitting or thinning at nozzle bores is cause for renewal - inspect per maker's guidance, no universal figure |
Ranges are typical for this design class. Always confirm against the manufacturer documentation for your serial number.
Fuel oil purifiers are typically covered under the vessel's general machinery survey; for HFO service, surveyors may pay particular attention to cat fine removal effectiveness (linked to main engine liner wear trends) and to overhaul records matching the maker's recommended interval.
Estimated lifetime: Bowl and rotating parts commonly remain in service 15-20 years with scheduled overhauls; seals, O-rings, and discs subject to cat fine erosion are consumables replaced considerably more often on HFO duty than on MDO duty.
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