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Library› Engine Room› Oily Water Separator› Oily Water Separator (15 ppm)› MAHLE NFV MPEB-VT-1
MAHLE NFV

MPEB-VT-1

Oily Water Separator (15 ppm) · Oily Water Separator

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

MAHLE NFV MPEB-VT-1 — Retrofit bilge water separator (divided/split system for space-restricted vessels), IMO MEPC.107(49) compliant, 15 ppm discharge standard.

Specifications

Technical data.reference — unverified

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Flow (m³/h)1
Ppm15
Inspection

Inspector Detail

Common issues

  • Coalescer/filter element fouling, reducing separation efficiency and increasing differential pressure
  • 15 ppm bilge alarm/monitor sensor fouling or drift, causing false alarms or missed exceedances
  • Solenoid valve sticking on the overboard discharge/recirculation line
  • Emulsified oil from cleaning agents in bilge water overwhelming separation stages
  • Air locking in the separator reducing throughput
  • Sensor cell window fouling requiring cleaning

Inspection checklist

  • Check differential pressure across coalescer/filter stages against baseline
  • Function test of the 15 ppm bilge alarm and automatic stopping device
  • Verify the three-way valve/solenoid correctly diverts to the bilge holding tank on high-ppm signal
  • Visual inspection for leaks at flanges, sight glasses and drain points
  • Check oil content monitor calibration/certification status
  • Confirm Oil Record Book entries are consistent with actual OWS operating hours and discharges
  • Inspect strainers/pre-filters for debris and sludge accumulation

Service intervals

Coalescer/filter element replacementper the manufacturer's maintenance schedule and differential pressure trend, commonly every 2000-4000 running hours or annually - confirm against the MAHLE NFV manual
15 ppm alarm/monitor calibration and certificationannually, per MEPC.107(49) requirement
Strainer/pre-filter cleaningweekly to monthly depending on bilge water condition
Full system overhaul/inspectionper class survey cycle, typically at each annual/intermediate IOPP survey

Typical wear limits

Coalescer differential pressuretrend against the unit's clean-element baseline - a sustained rise toward the manufacturer's stated maximum indicates the element needs replacement; confirm the specific threshold in the MAHLE NFV manual rather than assuming a generic figure

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

Critical spares

  • Coalescer filter elements/cartridges sized for this split-system model
  • 15 ppm oil content monitor sensor cell
  • Solenoid/three-way discharge valve
  • Gaskets and seals for filter housings

Safety

  • Illegal/uncontrolled discharge risk if the automatic stopping device is bypassed - never defeat the 15 ppm alarm interlock
  • Confined space precautions if entering the bilge/OWS compartment for maintenance
  • Oily waste handling - slip hazard and MARPOL Annex I compliance for disposal of removed sludge/filter media

Class survey

OWS units fall under MARPOL Annex I / IOPP certificate requirements. Surveyors check the IOPP certificate, MEPC.107(49) type approval documentation, 15 ppm alarm calibration records, and Oil Record Book consistency; the automatic stopping/alarm function is typically function-tested at survey.

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