Fuel Oil Separator · Separators & Purifiers
Alfa Laval P625-MDO-Purifier separator for purifier, marine fuel/lube oil, optimised for marine diesel oil purification. Fuel oil capacity 7474 l/h, lube oil capacity 5979 l/h. Bowl diameter 395 mm, motor power 7.5 kW. P-series purifiers are the predecessor of the S-series — widely installed worldwide.
| Major bowl overhaul (disc stack, seals, gaskets) | typically every 4,000-8,000 running hours or per maker's interval, whichever comes first - confirm against Alfa Laval's schedule for the P625 |
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| Drive belt / friction clutch inspection | every 2,000 running hours |
| Gravity disc check | on every significant change of fuel or lube oil grade/density |
| Sludge tank and discharge check | daily to weekly depending on fuel quality |
| Disc stack condition | no fixed numeric limit for this model - any pitting, erosion or deformation that prevents the discs from stacking correctly against each other is cause for renewal; compare against a new disc set |
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Ranges are typical for this design class. Always confirm against the manufacturer documentation for your serial number.
Fuel oil purifiers are covered under the periodical machinery survey. Surveyor typically wants overhaul/running-hour records, confirmation that the bowl-not-rotating safety interlock functions, and evidence sludge handling follows the vessel's approved oil record book procedures.
Estimated lifetime: bowl overhaul typically falls due every 4,000-8,000 running hours; the complete separator commonly remains in service 20-25 years with proper maintenance - confirm against Alfa Laval's own service schedule for the P625-MDO
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