Alfa Laval ALCAP S-817 500l/h 98C HFO700
Alfa Laval Alfa Laval ALCAP S-817 500l/h 98C HFO700 — Separators & Purifiers.
Inspector Detail
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Common issues
- Sludge outlet blockage causing incomplete bowl discharge
- Wrong or worn gravity disc/dam ring selection for the fuel density in use
- Bowl vibration from an unbalanced disc stack or worn bearings
- Feed temperature control faults around the 98 degrees C set point causing poor separation efficiency
- O-ring/seal wear on the bowl leading to leakage or discharge water contamination
- Frequent unscheduled sludge discharges from operating parameters drifting off set point
Inspection checklist
- Check operating temperature against the 98 degrees C HFO set point
- Verify bowl discharge cycle count and interval against normal baseline
- Inspect disc stack and bowl for deposits and wear at scheduled opening
- Check gaskets, O-rings, and seal rings for hardening or damage
- Check bearing condition, noise, and vibration on the drive
- Verify sludge tank level and discharge line are clear
- Check control panel alarms and interlocks function correctly
Service intervals
| Bowl disassembly and cleaning | typically every 4,000-8,000 running hours per Alfa Laval's recommendation, adjusted to fuel quality experienced |
| Seal/gasket kit replacement | at each major bowl overhaul |
| Bearing replacement | commonly in the 8,000-16,000 hour range for this separator class - confirm against the unit's own service manual |
| Gravity disc/dam ring check | whenever fuel density changes significantly |
Typical wear limits
| Bowl running hours since last overhaul | track against Alfa Laval's stated interval for this bowl size rather than a fixed number, since it depends heavily on fuel contamination level |
| Disc stack condition | reject on visible pitting, deformation, or clogging that cleaning does not remove |
Ranges are typical for this design class. Always confirm against the manufacturer documentation for your serial number.
Critical spares
- Bowl seal/O-ring kit
- Disc stack (if worn or damaged)
- Gravity discs/dam ring set covering the operating density range
- Bearing set for drive and bowl spindle
- Friction coupling/clutch pads, if fitted
Safety
- High-speed rotating bowl - never open or disturb while running; follow the maker's full stop/brake-down procedure before opening
- Bowl imbalance from incorrect assembly can cause violent vibration and structural failure
- Hot oil under pressure at separator inlet/outlet
- Sludge discharge line can carry hot, contaminated oil
Class survey
Fuel oil separators are a Continuous Survey Machinery item on many class notations - class checks running hour records, overhaul history, and that bowl speed/vibration and discharge water oil content are within normal limits at survey; keep the overhaul log and spare parts consumption record available.
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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