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Marinfloc

CD Unit (Oily Water Separator)

Oily Water Separator (15 ppm) · Oily Water Separator

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

Marinfloc CD Unit (Oily Water Separator) — Bilge water treatment on commercial and naval vessels; newbuildings and retrofits; separates free oil and emulsified oil from bilge water for overboard discharge.

Specifications

Technical data.reference — unverified

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Flow (m³/h)0.25–5.0
Inspection

Inspector Detail

Common issues

  • Coalescer element fouling or clogging causing high differential pressure
  • 15 ppm oil content monitor drift or fouling of the optical sample cell
  • Sludge accumulation in the first-stage separation chamber
  • Solenoid or discharge valve sticking, risking a false overboard discharge
  • Air lock in the unit reducing separation efficiency

Inspection checklist

  • 15 ppm monitor calibration and zero check
  • Coalescer differential pressure trend
  • Overboard discharge valve function and automatic stopping interlock test
  • Sludge/first-stage chamber level and pumping arrangement
  • Sample cock and monitor flow cell cleanliness
  • Control panel alarm log review
  • Oil record book entries cross-checked against monitor printout

Service intervals

15 ppm monitor calibrationtypically every 12 months or per manufacturer/flag state requirement
Coalescer element cleaning/renewalcondition-based, commonly every 6-12 months depending on bilge water quality
Sludge/first-stage sediment removalper the vessel's PMS, often monthly
Monitor sample line and flow cell cleaningtypically monthly

Typical wear limits

15 ppm discharge threshold and coalescer differential pressure alarmthese are set by the unit's type approval certificate and monitor manufacturer rather than a general figure - confirm against the CD Unit's own type approval documentation and do not treat 15 ppm as a target rather than a legal ceiling

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

Critical spares

  • Coalescer filter element set
  • 15 ppm monitor sample cell/lamp
  • Overboard discharge solenoid valve
  • Monitor calibration reference fluid/standard
  • Sample line filters and fittings

Safety

  • MARPOL non-compliance risk if the monitor or automatic stopping interlock is bypassed or defeated
  • Oily bilge water presents a slip and fire hazard in the machinery space
  • Confined space entry precautions apply to sludge tank cleaning

Class survey

Class and flag state surveys typically verify the 15 ppm monitor calibration certificate, check the automatic stopping device/interlock function, and cross-check oil record book entries against monitor data; MEPC 107(49) type approval documentation should be retained on board.

Estimated lifetime: OWS units of this type are commonly specified for a service life in the order of 15-20 years with periodic renewal of coalescers, monitor cells and valves, subject to bilge water quality and maintenance regime.

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