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S846

Separator/Purifier · Separators & Purifiers

Technical data from manufacturer or class sources · not yet verified by a person
Specifications

Technical data.

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Model numberS846
Capacity (HFO)12500 l/h
Capacity (lube oil)10000 l/h
Bowl diameter468 mm
Motor power11.0 kW
Applicationfuel/lube oil treatment, marine main
Drive typeDirect / gear-driven
Bowl typeSelf-cleaning disc-stack
Inspection

Inspector Detail

Common issues

  • Sludge and solids build-up on the disc stack from extended running beyond the design cycle, reducing separation efficiency
  • Water seal loss or incorrect seal water dosing causing oil discharge through the water/sludge outlet
  • Bowl vibration from uneven sludge deposit or a damaged/unbalanced bowl top after reassembly
  • Friction coupling or drive belt slip on start-up, extending run-up time to operating speed
  • Gasket and O-ring hardening on the bowl body leading to internal leakage past the sliding bowl bottom
  • Bearing noise or overheating in the vertical spindle from lubrication starvation or overdue bearing change
  • Discharge valve/piston sticking, causing incomplete or delayed desludging cycles

Inspection checklist

  • Verify bowl reaches full operating speed within the manufacturer's specified run-up time
  • Check discharge/desludge cycle timing and confirm clean, complete ejection at each shot
  • Inspect bowl body, distributor and disc stack for sludge deposits and mechanical damage at each opening
  • Check condition of all sealing rings, gaskets and O-rings; renew per the gasket kit schedule rather than by visual judgement alone
  • Check top and bottom bearing condition and lubrication (grease type/quantity per maker's chart)
  • Confirm operating water and seal water supply pressure and flow are within specification
  • Check vibration level of the bowl casing against baseline/trend
  • Verify interlocks (e.g. low seal water, high vibration, low speed) trip the separator as designed

Service intervals

Minor service (gasket kit, water seal ring)per running hours in maker's manual, typically every 4,000-8,000 h or annually, whichever comes first
Major overhaul (bearings, full disassembly)typically every 8,000-16,000 h - confirm against this model's maker schedule
Sliding bowl bottom / discharge O-ringsat every gasket-kit interval; more often if discharge frequency is high
Frame/spindle bearing greaseper maker's lubrication chart, typically every 2,000-4,000 h or as scheduled
Sludge/water outlet valve inspectionevery gasket-kit interval or sooner if desludging becomes irregular

Typical wear limits

Bowl body wear ring / spindle clearancecheck against maker's tolerance table at each major overhaul - no universal figure, this varies by bowl size
Friction coupling pad thicknessrenew when worn to the manufacturer's minimum mark, typically well before full loss of grip
Disc stack deformation/pittingrenew the stack if discs are visibly warped, heavily pitted or no longer stack flush

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

Critical spares

  • Bowl body gasket and O-ring kit (minor service kit)
  • Water seal ring / sliding bowl bottom sealing rings
  • Top and bottom bearing set for the vertical spindle
  • Disc stack (as a set, if deformed or heavily worn)
  • Friction coupling pads or drive belt set
  • Discharge/desludge valve seat and piston seals

Safety

  • High rotational energy stored in the bowl - never open the hood or attempt to stop the bowl by hand; use the brake and wait for full stop
  • Lock out and tag the starter and confirm zero speed before any bowl disassembly
  • Hot oil under pressure at the outlet connections during operation
  • Sludge/oily water discharge is a MARPOL-relevant waste stream - route and log per the vessel's oil record book, never overboard untreated
  • Bowl parts are heavy and asymmetric; use the correct lifting tackle, not manual handling, during overhaul

Class survey

Fuel/lube oil separators are typically Continuous Survey Machinery (CSM) items where that notation applies; class wants overhaul records matching the maker's interval, evidence of bearing/seal renewal, and confirmation the unit is not run materially beyond its rated cycle. Oily water/sludge handling from the separator feeds into MARPOL Annex I record-keeping reviewed alongside the machinery survey.

Estimated lifetime: Bowl and frame assembly commonly remain in service 15-20+ years with scheduled overhauls; individual wear parts (seals, bearings) are consumables on the intervals above, not lifetime-limited components

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