FOPX Series
The FOPX series was Alfa Laval's high-capacity purifier for large ocean-going vessels (VLCC, ULCC, large container ships) with 2-stroke main engines. Gravity disc principle like MAPX, but in significantly larger form. Built from 1985 to approximately 2010, then replaced by the ALCAP S924 and S935. Still frequently found on VLCCs and Capesize bulkers from the 1990–2010 build period.
Components & Design
Component data being added…
Technical Data
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Common failures & inspection points
Paring disc, top disc, mud ports check for dull spots/wash-out; erosion depth >0.2 mm (bowl/cap) or >0.5 mm (other) = replacement.
Leaks at cover/bolted joints/mud outlet; gasket rings (EPDM) change every 6000–8000 h, original parts only.
Check vibration/noise; bearings change in pairs every 12000–16000 h, lubricate correctly; do not increase throughput during vibration.
Belts every 3000 h (tension per manufacturer), cracks/wear; coupling check for axial play (>0.5 mm = fault), corrosion.
Monitor current consumption nominal/actual; clean bowl during shutdown; check pre-filtration + lubrication; limit sludge volume.
Type-general inspection and maintenance points for this equipment category — not model-specific.
Service & Maintenance
Bowl overhaul every 5,000-7,000 hrs. Gravity disc selection critical for fuel density range. Complete overhaul at drydock. Large footprint — engine room crane needed for bowl lift.
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