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Alfa Laval S.p.A.
MAB-205-MDO-Purifier
Description being added…
Inspector Detail
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Common issues
- Bowl imbalance or vibration from disc stack fouling or incorrect reassembly
- Sludge discharge malfunction - partial ejection or water seal problems
- Top/bottom bearing wear causing noise and vibration
- Friction clutch or gear coupling wear affecting start-up ramp time
- Incorrect gravity disc/dam ring selection for the current fuel or oil density
- Sliding bowl bottom O-ring wear causing internal leakage
- Feed or discharge valve fouling
Inspection checklist
- Vibration monitoring trend to detect bowl imbalance
- Bowl disassembly, cleaning and disc stack inspection at scheduled overhaul
- Bearing condition check/replacement at the manufacturer-specified interval
- Sliding bowl bottom seal (O-ring/gasket) inspection
- Water seal and seal-water supply check
- Discharge sequence and de-sludging interval verification
- Gravity disc/dam ring check against current fuel or lube oil density
- Motor current draw and motor bearing check
- Frame and foundation bolt tightness check
Service intervals
| Bowl disassembly, cleaning and disc stack inspection | per the manufacturer's manual, typically every 4000-8000 hours - confirm against this model's manual |
| Bearing replacement | per the manufacturer's schedule, commonly every 8000-16000 hours or a fixed calendar interval (e.g. 1-2 years) - confirm against the maker's manual |
| Sliding bowl bottom O-rings/gaskets | replaced at every bowl overhaul |
| Gear/friction clutch oil change | per the manufacturer's interval, typically every 2000-4000 hours |
Typical wear limits
| Bearing replacement timing | per the manufacturer's schedule, condition (vibration) plus a fixed calendar limit - no generic hour figure, confirm against this model's manual |
| Disc stack/bowl wear (erosion, pitting) | replace on visible wear or pitting per the manufacturer's inspection criteria |
Ranges are typical for this design class. Always confirm against the manufacturer documentation for your serial number.
Critical spares
- Top and bottom bearing sets
- Sliding bowl bottom O-ring/seal kit
- Disc stack gasket/seal kit
- Friction clutch pads or gear coupling elements
- Gravity disc set covering the expected density range
- Water seal ring
Safety
- High bowl rotational speed - never open the bowl casing before the rotor is confirmed fully stopped
- Hot oil/fuel surfaces and piping around the unit
- Incorrect bowl reassembly can cause violent imbalance and structural failure
- Pressurized water seal supply system
Class survey
Fuel oil purifiers/separators are usually within the Continuous Survey Machinery scope on classed vessels; class looks for evidence of bearing/overhaul intervals followed per the maker's manual, vibration monitoring records, and the correct disc/gravity ring configuration for the fuel currently in use.
Estimated lifetime:
Disc-stack separators of this size and duty are commonly kept in service 15-20+ years, with the bowl and frame as the long-life components while bearings, seals and gaskets are wear items replaced on a fixed schedule.
Components & Design
Component data being added…
Technical Data
Model number
MAB-205-MDO-Purifier
Capacity (HFO)
3449 l/h
Capacity (lube oil)
2760 l/h
Bowl diameter
340 mm
Motor power
5.5 kW
Application
auxiliary fuel/lube separator, optimised for marine diesel oil purification
Drive type
Direct / gear-driven
Bowl type
Solids-retaining disc-stack
Fuel type optimised
MDO
Capacity (at optimum fuel)
3449 l/h
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Equipment Model #153186
· ✓ still in production