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OSE 20-91

Separator/Purifier · Separators & Purifiers

Technical data from manufacturer or class sources · not yet verified by a person​‌​​‍​‍‍​‍​​⁠⁠​⁠​⁠​⁠
FO purificationMedium

GEA Westfalia Separators & Purifiers. GEA Westfalia Marine Separators are self-cleaning centrifugal separators used for clarification and purification of fuel oil and lube oil on marine vessels. The OSD series (introduced 2000) and newer OSE eagleclass (2008/2010) feature 3-phase AC motor drive with centrifugal clutch and flat belt transmission. The OSE generation delivers 30% energy r

Specifications

Technical data.

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Separator TypeDisc Centrifugal
Flow Rate (m³/h)6.0
Bowl Speed (1/min)8000
MediumFO purification
Inspection

Inspector Detail

Common issues

  • Sludge discharge intervals drifting out of spec, causing bowl fouling and loss of separation efficiency
  • Worn or damaged gaskets/O-rings on the bowl assembly leading to water or oil leakage past the seals
  • Bowl vibration from an unbalanced disc stack or worn spindle bearings
  • Frictional lining wear on the self-cleaning drive clutch causing slow start-up or slipping
  • Operating water solenoid valve fouling, causing incomplete or failed sludge discharge
  • Vertical drive spindle bearing wear from extended run hours without lubrication checks
  • Gravity disc/regulating ring mismatched to the actual feed density, reducing separation quality
  • Control unit sensor drift causing false or missed discharge signals

Inspection checklist

  • Check bowl body, sliding bowl bottom and distributor for erosion or corrosion pitting
  • Inspect all bowl gaskets, O-rings and seal rings for hardening, cracking or extrusion
  • Check disc stack for scale buildup, cracking or deformed distribution holes
  • Verify sliding bowl bottom seats and closes correctly during a test discharge cycle
  • Inspect frictional lining/clutch (self-cleaning drive) for wear thickness and even contact
  • Check vertical and horizontal drive shaft bearings for play and abnormal noise
  • Verify the gravity disc/regulating ring fitted matches the actual operating density
  • Test the automatic sludge discharge cycle and timing against set values
  • Check operating water and sealing water supply pressure and quality
  • Check bowl run-up vibration at operating speed against the maker's limits

Service intervals

Bowl disassembly and cleaning500-1,000 running hours or per the maker's manual, whichever comes first
Gasket/O-ring replacement (bowl seals)every bowl overhaul, typically 4,000-8,000 hours
Frictional lining/clutch inspectionevery 4,000-6,000 hours
Gear/drive oil change2,000-4,000 hours or per the maker's schedule
Major overhaul (bearings, spindle, main drive)12,000-16,000 hours - confirm against the maker's major overhaul interval
Operating water solenoid valve function testmonthly

Typical intervals for this design class, not the manufacturer’s figures for your model. The manufacturer’s manual is binding.

Typical wear limits

Frictional lining thicknessrenew once remaining thickness is close to the maker's minimum - confirm the exact figure in the maker's manual
Bowl spindle bearing radial playgenerally renewed once clearance is well beyond the as-new tolerance - check the maker's limit table
Disc stack distribution holesvisible enlargement or heavy scale buildup is generally cause for renewal - confirm against the maker's inspection criteria

Ranges are typical for this design class. Always confirm against the manufacturer documentation for your serial number.

Critical spares

  • Bowl gasket and O-ring set (full seal kit)
  • Sliding bowl bottom seal ring
  • Disc stack (spare set)
  • Frictional lining segments / clutch kit for the self-cleaning drive
  • Operating water solenoid valve
  • Vertical spindle bearing set

Safety

  • Bowl components are heavy and rotate at several thousand rpm - never open the bowl before confirming a full spindown and electrical lockout
  • Hot oil/water discharge lines during operation carry a scald risk
  • Incorrect bowl reassembly (wrong torque or a missing part) can cause the bowl to disintegrate at running speed
  • Pressurized operating water system - isolate and depressurize before working on valves or piping
  • Guard interlocks on the drive belt/clutch assembly must never be bypassed

Class survey

Fuel oil and lube oil purifiers are typically within Continuous Survey Machinery (CSM) scope where the vessel carries that notation; class checks maintenance records for bowl overhaul intervals, sludge discharge test records and bowl-closed safety interlock function. Keep the maker's service reports and parts-replaced logs on board for survey.

Estimated lifetime: Bowl and rotating assembly commonly run 60,000-100,000 hours between major overhauls with correct maintenance; wear parts such as linings and seals need renewal far more frequently - treat as an approximate range, not a guarantee

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