Alfa Laval P615-HFO-Purifier
Alfa Laval P615-HFO-Purifier purifier separator for purifier, marine fuel/lube oil, 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. P-series purifiers are the predecessor of the S-series — widely installed worldwide.
Inspector Detail
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Common issues
- Bowl disc stack fouling with sludge, reducing separation efficiency
- Gravity disc (dam ring) mis-selection for the actual feed water content, causing water carryover into clean oil or loss of seal water
- Bowl seal ring/O-ring wear causing water or oil leakage at bowl closure
- Sliding bowl bottom wear or sticking, affecting sludge discharge
- Feed or discharge pump wear reducing throughput
- Vibration from bowl imbalance after inadequate cleaning or worn bearings
- Sludge discharge (ejection) failure from worn nozzles or a faulty control water system
Inspection checklist
- Check the bowl disc stack for sludge buildup and clean per the running-hour interval
- Inspect bowl seal rings, O-rings and the sliding bowl bottom for wear/damage at each opening
- Verify the gravity disc size matches the current feed water content
- Check top and bottom bearing condition and vibration level against baseline
- Inspect the sludge discharge (ejection) function and control water valve operation
- Check feed and discharge pump condition and flow rate against nameplate
- Verify drive belt or gear condition and alignment
- Inspect the bowl body and lock ring for cracks or wear at scheduled overhaul
Service intervals
| Bowl disassembly and cleaning | typically every 200-500 running hours depending on fuel quality and sludge content - confirm against operating experience for the fuel in use |
| O-ring/seal ring renewal | at every bowl opening as standard practice, condition-based even if visually serviceable |
| Bearing overhaul | per running hours per Alfa Laval's maintenance schedule, commonly in the 8,000-10,000 running hour range for this frame size - confirm against the current maker manual |
| Gravity disc check | on any change in feed water content or after bunkering a different fuel batch |
Typical wear limits
| Bowl seal ring/O-ring | renew on any visible hardening, cracking or set - condition-based per the maker's guidance, no fixed dimension |
| Bearing radial play | per Alfa Laval's bearing renewal table for this frame size - confirm against the maker's current manual, not a generic figure |
| Bowl body wall thickness (long-term erosion/corrosion) | no generic figure - condemning thickness is set by Alfa Laval per bowl size/material and must be checked via the maker's periodic bowl inspection/UT programme, especially beyond the design service life |
Ranges are typical for this design class. Always confirm against the manufacturer documentation for your serial number.
Critical spares
- Bowl seal ring and O-ring overhaul kit
- Gravity disc set (assorted sizes)
- Sliding bowl bottom
- Top and bottom bearing sets
- Sludge discharge nozzles/valve components
- Drive belt set, if belt-driven
Safety
- The rotating bowl carries significant stored energy - never open it before the machine has come to a complete stop and per the maker's lockout procedure
- Hot oil under pressure is present at the feed/discharge - isolate and depressurize before opening pipework
- The bowl lock ring must be torqued and inspected per the maker's procedure - an improperly secured bowl is a severe overspeed/burst hazard
- Sludge tank connections may contain flammable vapour - follow the vessel's confined space/hot work precautions
Class survey
Fuel oil purifiers in the fuel treatment line are typically included in Continuous Machinery Survey; class checks safety interlocks (bowl closed/locked before start), overspeed/vibration trip function, and maintenance/overhaul records rather than individual component wear.
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.
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