Oily Water Separator

critical 46 models total

An oily water separator treats bilge water in two stages, a gravity separation stage followed by coalescing or fine filtration, and includes a continuous oil content monitor that automatically stops overboard discharge if the legal limit is exceeded.

Read more — Oily Water Separator explained ▾

What Makes an Oily Water Separator Different

An oily water separator (OWS) is not a single filter but a small treatment plant: bilge water enters a first gravity stage where free oil rises and heavier solids settle, then passes through a coalescing or fine-filtration second stage that strips out the fine oil droplets gravity alone cannot remove. A separate, independently certified oil content monitor (OCM) samples the outlet continuously and automatically diverts the flow back to the bilge holding tank the instant it senses oil above the legal limit, rather than letting the separator's own performance be the only safeguard. That combination of mechanical separation plus an independent electronic watchdog is what distinguishes an OWS from a simple bilge strainer or a standalone filter unit, neither of which can be discharged overboard on its own authority.

Oily water separator, flow schematic — Flow path of bilge water through an oily water separator, from the gravity separation stage through the coalescer to the oil content monitor and three-way valve, which sends clean water overboard or recirculates it to the bilge if the oil content is too high, with oil drawn off to the sludge tank.

Main Components

Gravity/coalescing separator

The primary vessel, often a two- or three-chamber steel tank, where oil droplets coalesce on plates or packing and rise to a collecting space skimmed off to a sludge tank.

Fine filter or second-stage coalescer

Removes the remaining fine droplets on the way toward the discharge limit; filter elements or coalescer packs are consumable and need periodic replacement.

Oil content monitor (OCM)

An independently type-approved instrument, separate from the separator's own controls, that continuously measures oil-in-water at the overboard line and closes a three-way valve on a high reading.

Three-way discharge valve

Automatically routed to the bilge tank on an OCM alarm, and increasingly required to be sealed or logged so it cannot be bypassed without a recorded event.

Pumps and piping

A dedicated bilge pump feeds the unit; the piping arrangement must prevent any unauthorized bypass around the separator or the monitor.

Selection and Sizing

Rated throughput in cubic metres per hour, sized to the ship's bilge pumping capacity and machinery space volume
Compatibility with the fuel and lubricating oil types actually carried, since some emulsified oils and detergent-based cleaners resist gravity separation
OCM type approval covering the discharge standard the ship trades under, including any regional limits stricter than the IMO baseline
Footprint and headroom in the engine room, since the unit is usually retrofitted into an already crowded space

Regulations and Class

MARPOL Annex I sets the 15 ppm discharge limit for machinery space bilge water outside special areas, with stricter limits and additional monitoring, recording and equipment requirements applying in some regions. Every OWS and OCM combination must carry IMO type approval under the applicable MEPC resolution, and the ship must keep an Oil Record Book Part I logging every discharge, transfer and disposal of oily residues. Class and flag state surveys check that the OCM alarm and automatic stopping device function correctly and that no unauthorized bypass piping exists; bypass arrangements found during Port State Control inspections are treated as a serious deficiency and have led to criminal prosecutions under MARPOL.

Typical Faults

Fault	Cause	Consequence
OCM giving false clean readings	Dirty sample cell, uncalibrated sensor, sample line fouled	Undetected oily discharge, MARPOL violation risk
Separator overwhelmed by emulsified oil	Detergents or chemical cleaners washed into the bilge	Poor separation, frequent OCM trips, sludge tank filling faster than expected
Filter/coalescer elements clogging quickly	Heavy solids or rust scale in bilge water not pre-strained	Reduced throughput, rising differential pressure, more frequent element changes
Illegal bypass piping	Crew shortcut installed to avoid slow processing	Detention, fines, criminal liability for owner and crew

What to Look for in a Supplier

Current IMO type approval certificate for both the separator and the OCM, matched to the discharge standard the ship needs
Filter and coalescer elements available as standard, stocked spares rather than a single proprietary source
A monitor design with a track record of stable calibration rather than frequent false trips, since crews disable unreliable alarms
Clear documentation supporting the flag state approval process and Port State Control inspection

Every bypass line an OWS has ever been caught with started as someone's temporary fix during an overload; there is no version of that shortcut that ends well once Port State Control finds it.

Inspector Mode Show All 46 total

13 manufacturers · 46 models

Alfa Laval

PureBilge Series

0.5-5.0 m³/h · Bilge Water / Oily Water

Type

Centrifugal + Coalescer OWS with 15 ppm Oil Content Monitor

Size Range

PureBilge 0.5
PureBilge 1.0
PureBilge 2.5
PureBilge 5.0

Flow range (m³/h)

Power range (kW)

Drive Type

Electric

Construction

Centrifugal separator + coalescer + 15 ppm OCM, skid-mounted

Technical Specifications

Durchsatz (PureBilge 2515): 2.500 l/h
Durchsatz (PureBilge 5015): 5.000 l/h
Separator-drehzahl: 8.000 rpm
Ölgehalt Ausgabe (typisch): <5 ppm (MARPOL-Limit: 15 ppm)
Filtermedium: Vorwärmefilter + Koalescenteinsätze
Prozessregler: EPC 60/70 (computergestützt, mit Cybersecurity)

Product Lines

PureBilge 2515 (2500 l/h, 15ppm)
PureBilge 5015 (5000 l/h, 15ppm)
PureBilge Compact 0605 (600 l/h, 5ppm)

Common Failures & Inspection Points

Area: 15ppm-Ölgehalt-Monitor (Optical Cell) Verschmutzung/Kalibrierung
Check: Visual: Check optical cell for fouling; Function test via high-oil simulation (monthly); Calibration by authorized manufacturer agent every 12 months or before IOPP renewal survey (MEPC.107(49) § 4.2.11 requirement)
Area: Coalescer inserts (filter/coalescer) blockage, wear or degradation
Check: Routine inspection: Weekly check filter/coalescer elements for wear, clogging or damage; Replace upon blockage or visible wear (planned maintenance). Internal inspection: Clear separator chamber and inspect coalescer inserts for aging
Area: Three-way valve (changeover valve) position and function
Check: Daily: Check all valve positions; Monthly: Test three-way valve under simulated high-oil condition to confirm diversion to slop tank; Check for leakage at flange connections; Actuation without delay or abnormal noise
Area: Process controller (EPC 60/70) alarms, data logging and sensor functions
Check: Weekly: Check all sensors (temperature, pressure, speed) for functionality; Monthly: Check data logging device and review log data; Quarterly: Test all alarms and sensor outputs (document with protocol); Annually: Verify sensor calibration
Area: Piping and flange connections: Leakage and corrosion
Check: Daily: Visually inspect all pipes and valve connections for oil film, droplet formation or corrosion (especially hot water/drain areas); Weekly: Check flanges for reduction in clamping force or leakage under load; Immediately repair if signs of corrosion or leakage appear
Area: Heater (if electrical) and preheating to setpoint temperature
Check: Daily: Check outlet temperature of preheated bilge water (typical: 50-70°C, manufacturer-specific); Weekly: Inspect heating element surface for deposits, wear or charring; Monthly: Calibrate thermostats and temperature sensors; If setpoint temperature is not reached, check thermocouple or controller

Type-universal inspection/maintenance points for oily water separator (Alfa Laval, Mega-Schwarm 2026-06). Per-model specs not auto-filled.

Service: OCM calibration check monthly (MEPC.107(49) requirement). Coalescer element replacement every 2,000-4,000 hrs depending on bilge quality. Separator bowl overhaul per Alfa Laval schedule. MARPOL Oil Record Book entries for every operation.

Spare Parts: Alfa Laval global network. Coalescer elements: keep 2 onboard. OCM spare lamp/sensor: 1 set. Lead time: 2-4 weeks.

Manufacturer Datasheet

Datasheet

MAPX 207/309 (Bilge Separator)

0.5-5.0 m³/h · Bilge Water / Oily Water

discontinued

Type

Disc-Stack Centrifugal Separator (Bilge Duty)

Size Range

MAPX 207
MAPX 309

Flow range (m³/h)

Power range (kW)

Drive Type

Electric

Construction

Disc-stack centrifuge, same platform as fuel/lube oil separator

Successor series

PureBilge Series

Technical Specifications

Durchsatz (PureBilge 2515): 2.500 l/h
Durchsatz (PureBilge 5015): 5.000 l/h
Separator-drehzahl: 8.000 rpm
Ölgehalt Ausgabe (typisch): <5 ppm (MARPOL-Limit: 15 ppm)
Filtermedium: Vorwärmefilter + Koalescenteinsätze
Prozessregler: EPC 60/70 (computergestützt, mit Cybersecurity)

Product Lines

PureBilge 2515 (2500 l/h, 15ppm)
PureBilge 5015 (5000 l/h, 15ppm)
PureBilge Compact 0605 (600 l/h, 5ppm)

Common Failures & Inspection Points

Area: 15ppm-Ölgehalt-Monitor (Optical Cell) Verschmutzung/Kalibrierung
Check: Visual: Check optical cell for fouling; Function test via high-oil simulation (monthly); Calibration by authorized manufacturer agent every 12 months or before IOPP renewal survey (MEPC.107(49) § 4.2.11 requirement)
Area: Coalescer inserts (filter/coalescer) blockage, wear or degradation
Check: Routine inspection: Weekly check filter/coalescer elements for wear, clogging or damage; Replace upon blockage or visible wear (planned maintenance). Internal inspection: Clear separator chamber and inspect coalescer inserts for aging
Area: Three-way valve (changeover valve) position and function
Check: Daily: Check all valve positions; Monthly: Test three-way valve under simulated high-oil condition to confirm diversion to slop tank; Check for leakage at flange connections; Actuation without delay or abnormal noise
Area: Process controller (EPC 60/70) alarms, data logging and sensor functions
Check: Weekly: Check all sensors (temperature, pressure, speed) for functionality; Monthly: Check data logging device and review log data; Quarterly: Test all alarms and sensor outputs (document with protocol); Annually: Verify sensor calibration
Area: Piping and flange connections: Leakage and corrosion
Check: Daily: Visually inspect all pipes and valve connections for oil film, droplet formation or corrosion (especially hot water/drain areas); Weekly: Check flanges for reduction in clamping force or leakage under load; Immediately repair if signs of corrosion or leakage appear
Area: Heater (if electrical) and preheating to setpoint temperature
Check: Daily: Check outlet temperature of preheated bilge water (typical: 50-70°C, manufacturer-specific); Weekly: Inspect heating element surface for deposits, wear or charring; Monthly: Calibrate thermostats and temperature sensors; If setpoint temperature is not reached, check thermocouple or controller

Type-universal inspection/maintenance points for oily water separator (Alfa Laval, Mega-Schwarm 2026-06). Per-model specs not auto-filled.

Service: Bowl overhaul every 3,000-5,000 hrs. Pre-filtering of bilge water strongly recommended. Discontinued — replaced by PureBilge.

Spare Parts: Alfa Laval legacy stock. Declining availability. Lead time: 4-8 weeks. Recommend upgrade to PureBilge.

Manufacturer Datasheet

Datasheet

PureSOx-U-25

Model number

PureSOx-U-25

Engine power rating

25 MW

Throat diameter

900 mm

Scrubbing water flow

450 m3/h

Weight (dry)

38 t

Application

U-design scrubber, single engine 25 MW

Operating modes

Open-loop, closed-loop, hybrid

Compliance

IMO MARPOL Annex VI 2020 sulphur cap

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Datasheet

PureSOx-U-25-Open

Model number

PureSOx-U-25-Open

Engine power rating

25 MW

Throat diameter

900 mm

Scrubbing water flow

450 m3/h

Weight (dry)

38 t

Application

U-design scrubber, single engine 25 MW; open-loop scrubber, seawater alkalinity

Operating modes

Open-loop, closed-loop, hybrid

Compliance

IMO MARPOL Annex VI 2020 sulphur cap

Operating mode

open-loop scrubber, seawater alkalinity

Mode suffix

Open

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Datasheet

PureSOx-U-25-Closed

Model number

PureSOx-U-25-Closed

Engine power rating

25 MW

Throat diameter

900 mm

Scrubbing water flow

450 m3/h

Weight (dry)

38 t

Application

U-design scrubber, single engine 25 MW; closed-loop scrubber, NaOH dosing

Operating modes

Open-loop, closed-loop, hybrid

Compliance

IMO MARPOL Annex VI 2020 sulphur cap

Operating mode

closed-loop scrubber, NaOH dosing

Mode suffix

Closed

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Datasheet

PureSOx-U-25-Hybrid

Model number

PureSOx-U-25-Hybrid

Engine power rating

25 MW

Throat diameter

900 mm

Scrubbing water flow

450 m3/h

Weight (dry)

38 t

Application

U-design scrubber, single engine 25 MW; hybrid scrubber, switchable open/closed

Operating modes

Open-loop, closed-loop, hybrid

Compliance

IMO MARPOL Annex VI 2020 sulphur cap

Operating mode

hybrid scrubber, switchable open/closed

Mode suffix

Hybrid

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Datasheet

PureSOx-U-35

Model number

PureSOx-U-35

Engine power rating

35 MW

Throat diameter

1100 mm

Scrubbing water flow

650 m3/h

Weight (dry)

52 t

Application

U-design scrubber, 35 MW

Operating modes

Open-loop, closed-loop, hybrid

Compliance

IMO MARPOL Annex VI 2020 sulphur cap

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Datasheet

PureSOx-U-35-Open

Model number

PureSOx-U-35-Open

Engine power rating

35 MW

Throat diameter

1100 mm

Scrubbing water flow

650 m3/h

Weight (dry)

52 t

Application

U-design scrubber, 35 MW; open-loop scrubber, seawater alkalinity

Operating modes

Open-loop, closed-loop, hybrid

Compliance

IMO MARPOL Annex VI 2020 sulphur cap

Operating mode

open-loop scrubber, seawater alkalinity

Mode suffix

Open

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Datasheet

PureSOx-U-35-Closed

Model number

PureSOx-U-35-Closed

Engine power rating

35 MW

Throat diameter

1100 mm

Scrubbing water flow

650 m3/h

Weight (dry)

52 t

Application

U-design scrubber, 35 MW; closed-loop scrubber, NaOH dosing

Operating modes

Open-loop, closed-loop, hybrid

Compliance

IMO MARPOL Annex VI 2020 sulphur cap

Operating mode

closed-loop scrubber, NaOH dosing

Mode suffix

Closed

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Datasheet

PureSOx-U-35-Hybrid

Model number

PureSOx-U-35-Hybrid

Engine power rating

35 MW

Throat diameter

1100 mm

Scrubbing water flow

650 m3/h

Weight (dry)

52 t

Application

U-design scrubber, 35 MW; hybrid scrubber, switchable open/closed

Operating modes

Open-loop, closed-loop, hybrid

Compliance

IMO MARPOL Annex VI 2020 sulphur cap

Operating mode

hybrid scrubber, switchable open/closed

Mode suffix

Hybrid

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Datasheet

PureSOx-U-50

Model number

PureSOx-U-50

Engine power rating

50 MW

Throat diameter

1350 mm

Scrubbing water flow

920 m3/h

Weight (dry)

75 t

Application

U-design scrubber, 50 MW

Operating modes

Open-loop, closed-loop, hybrid

Compliance

IMO MARPOL Annex VI 2020 sulphur cap

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Datasheet

PureSOx-U-50-Open

Model number

PureSOx-U-50-Open

Engine power rating

50 MW

Throat diameter

1350 mm

Scrubbing water flow

920 m3/h

Weight (dry)

75 t

Application

U-design scrubber, 50 MW; open-loop scrubber, seawater alkalinity

Operating modes

Open-loop, closed-loop, hybrid

Compliance

IMO MARPOL Annex VI 2020 sulphur cap

Operating mode

open-loop scrubber, seawater alkalinity

Mode suffix

Open

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Datasheet

PureSOx-U-50-Closed

Model number

PureSOx-U-50-Closed

Engine power rating

50 MW

Throat diameter

1350 mm

Scrubbing water flow

920 m3/h

Weight (dry)

75 t

Application

U-design scrubber, 50 MW; closed-loop scrubber, NaOH dosing

Operating modes

Open-loop, closed-loop, hybrid

Compliance

IMO MARPOL Annex VI 2020 sulphur cap

Operating mode

closed-loop scrubber, NaOH dosing

Mode suffix

Closed

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Datasheet

PureSOx-U-50-Hybrid

Model number

PureSOx-U-50-Hybrid

Engine power rating

50 MW

Throat diameter

1350 mm

Scrubbing water flow

920 m3/h

Weight (dry)

75 t

Application

U-design scrubber, 50 MW; hybrid scrubber, switchable open/closed

Operating modes

Open-loop, closed-loop, hybrid

Compliance

IMO MARPOL Annex VI 2020 sulphur cap

Operating mode

hybrid scrubber, switchable open/closed

Mode suffix

Hybrid

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Datasheet

PureSOx-U-70

Model number

PureSOx-U-70

Engine power rating

70 MW

Throat diameter

1600 mm

Scrubbing water flow

1300 m3/h

Weight (dry)

105 t

Application

U-design scrubber, 70 MW

Operating modes

Open-loop, closed-loop, hybrid

Compliance

IMO MARPOL Annex VI 2020 sulphur cap

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Datasheet

PureSOx-U-70-Open

Model number

PureSOx-U-70-Open

Engine power rating

70 MW

Throat diameter

1600 mm

Scrubbing water flow

1300 m3/h

Weight (dry)

105 t

Application

U-design scrubber, 70 MW; open-loop scrubber, seawater alkalinity

Operating modes

Open-loop, closed-loop, hybrid

Compliance

IMO MARPOL Annex VI 2020 sulphur cap

Operating mode

open-loop scrubber, seawater alkalinity

Mode suffix

Open

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Datasheet

PureSOx-U-70-Closed

Model number

PureSOx-U-70-Closed

Engine power rating

70 MW

Throat diameter

1600 mm

Scrubbing water flow

1300 m3/h

Weight (dry)

105 t

Application

U-design scrubber, 70 MW; closed-loop scrubber, NaOH dosing

Operating modes

Open-loop, closed-loop, hybrid

Compliance

IMO MARPOL Annex VI 2020 sulphur cap

Operating mode

closed-loop scrubber, NaOH dosing

Mode suffix

Closed

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Datasheet

PureSOx-U-70-Hybrid

Model number

PureSOx-U-70-Hybrid

Engine power rating

70 MW

Throat diameter

1600 mm

Scrubbing water flow

1300 m3/h

Weight (dry)

105 t

Application

U-design scrubber, 70 MW; hybrid scrubber, switchable open/closed

Operating modes

Open-loop, closed-loop, hybrid

Compliance

IMO MARPOL Annex VI 2020 sulphur cap

Operating mode

hybrid scrubber, switchable open/closed

Mode suffix

Hybrid

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Datasheet

PureSOx-I-25

Model number

PureSOx-I-25

Engine power rating

25 MW

Throat diameter

900 mm

Scrubbing water flow

500 m3/h

Weight (dry)

35 t

Application

I-design scrubber, single engine

Operating modes

Open-loop, closed-loop, hybrid

Compliance

IMO MARPOL Annex VI 2020 sulphur cap

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Datasheet

PureSOx-I-25-Open

Model number

PureSOx-I-25-Open

Engine power rating

25 MW

Throat diameter

900 mm

Scrubbing water flow

500 m3/h

Weight (dry)

35 t

Application

I-design scrubber, single engine; open-loop scrubber, seawater alkalinity

Operating modes

Open-loop, closed-loop, hybrid

Compliance

IMO MARPOL Annex VI 2020 sulphur cap

Operating mode

open-loop scrubber, seawater alkalinity

Mode suffix

Open

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Datasheet

PureSOx-I-25-Closed

Model number

PureSOx-I-25-Closed

Engine power rating

25 MW

Throat diameter

900 mm

Scrubbing water flow

500 m3/h

Weight (dry)

35 t

Application

I-design scrubber, single engine; closed-loop scrubber, NaOH dosing

Operating modes

Open-loop, closed-loop, hybrid

Compliance

IMO MARPOL Annex VI 2020 sulphur cap

Operating mode

closed-loop scrubber, NaOH dosing

Mode suffix

Closed

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Datasheet

PureSOx-I-25-Hybrid

Model number

PureSOx-I-25-Hybrid

Engine power rating

25 MW

Throat diameter

900 mm

Scrubbing water flow

500 m3/h

Weight (dry)

35 t

Application

I-design scrubber, single engine; hybrid scrubber, switchable open/closed

Operating modes

Open-loop, closed-loop, hybrid

Compliance

IMO MARPOL Annex VI 2020 sulphur cap

Operating mode

hybrid scrubber, switchable open/closed

Mode suffix

Hybrid

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Datasheet

PureSOx-I-50

Model number

PureSOx-I-50

Engine power rating

50 MW

Throat diameter

1350 mm

Scrubbing water flow

1000 m3/h

Weight (dry)

70 t

Application

I-design scrubber, large engine

Operating modes

Open-loop, closed-loop, hybrid

Compliance

IMO MARPOL Annex VI 2020 sulphur cap

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Datasheet

PureSOx-I-50-Open

Model number

PureSOx-I-50-Open

Engine power rating

50 MW

Throat diameter

1350 mm

Scrubbing water flow

1000 m3/h

Weight (dry)

70 t

Application

I-design scrubber, large engine; open-loop scrubber, seawater alkalinity

Operating modes

Open-loop, closed-loop, hybrid

Compliance

IMO MARPOL Annex VI 2020 sulphur cap

Operating mode

open-loop scrubber, seawater alkalinity

Mode suffix

Open

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Datasheet

PureSOx-I-50-Closed

Model number

PureSOx-I-50-Closed

Engine power rating

50 MW

Throat diameter

1350 mm

Scrubbing water flow

1000 m3/h

Weight (dry)

70 t

Application

I-design scrubber, large engine; closed-loop scrubber, NaOH dosing

Operating modes

Open-loop, closed-loop, hybrid

Compliance

IMO MARPOL Annex VI 2020 sulphur cap

Operating mode

closed-loop scrubber, NaOH dosing

Mode suffix

Closed

[08.08.2026] Datenblattlink entfernt (fehler 404): https://www.alfalaval.com/products/process-solutions/exhaust-gas-cleaning/puresox/

Datasheet

PureSOx-I-50-Hybrid

Model number

PureSOx-I-50-Hybrid

Engine power rating

50 MW

Throat diameter

1350 mm

Scrubbing water flow

1000 m3/h

Weight (dry)

70 t

Application

I-design scrubber, large engine; hybrid scrubber, switchable open/closed

Operating modes

Open-loop, closed-loop, hybrid

Compliance

IMO MARPOL Annex VI 2020 sulphur cap

Operating mode

hybrid scrubber, switchable open/closed

Mode suffix

Hybrid

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Datasheet

PureSOx-Multi-2

Model number

PureSOx-Multi-2

Engine power rating

50 MW

Throat diameter

1600 mm

Scrubbing water flow

1000 m3/h

Weight (dry)

80 t

Application

multi-stream scrubber, 2 engines

Operating modes

Open-loop, closed-loop, hybrid

Compliance

IMO MARPOL Annex VI 2020 sulphur cap

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Datasheet

PureSOx-Multi-2-Open

Model number

PureSOx-Multi-2-Open

Engine power rating

50 MW

Throat diameter

1600 mm

Scrubbing water flow

1000 m3/h

Weight (dry)

80 t

Application

multi-stream scrubber, 2 engines; open-loop scrubber, seawater alkalinity

Operating modes

Open-loop, closed-loop, hybrid

Compliance

IMO MARPOL Annex VI 2020 sulphur cap

Operating mode

open-loop scrubber, seawater alkalinity

Mode suffix

Open

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Datasheet

PureSOx-Multi-2-Closed

Model number

PureSOx-Multi-2-Closed

Engine power rating

50 MW

Throat diameter

1600 mm

Scrubbing water flow

1000 m3/h

Weight (dry)

80 t

Application

multi-stream scrubber, 2 engines; closed-loop scrubber, NaOH dosing

Operating modes

Open-loop, closed-loop, hybrid

Compliance

IMO MARPOL Annex VI 2020 sulphur cap

Operating mode

closed-loop scrubber, NaOH dosing

Mode suffix

Closed

[08.08.2026] Datenblattlink entfernt (fehler 404): https://www.alfalaval.com/products/process-solutions/exhaust-gas-cleaning/puresox/

Datasheet

PureSOx-Multi-2-Hybrid

Model number

PureSOx-Multi-2-Hybrid

Engine power rating

50 MW

Throat diameter

1600 mm

Scrubbing water flow

1000 m3/h

Weight (dry)

80 t

Application

multi-stream scrubber, 2 engines; hybrid scrubber, switchable open/closed

Operating modes

Open-loop, closed-loop, hybrid

Compliance

IMO MARPOL Annex VI 2020 sulphur cap

Operating mode

hybrid scrubber, switchable open/closed

Mode suffix

Hybrid

[08.08.2026] Datenblattlink entfernt (fehler 404): https://www.alfalaval.com/products/process-solutions/exhaust-gas-cleaning/puresox/

Datasheet

PureSOx-Multi-4

Model number

PureSOx-Multi-4

Engine power rating

90 MW

Throat diameter

2000 mm

Scrubbing water flow

1800 m3/h

Weight (dry)

130 t

Application

multi-stream scrubber, 4 engines

Operating modes

Open-loop, closed-loop, hybrid

Compliance

IMO MARPOL Annex VI 2020 sulphur cap

[08.08.2026] Datenblattlink entfernt (fehler 404): https://www.alfalaval.com/products/process-solutions/exhaust-gas-cleaning/puresox/

Datasheet

PureSOx-Multi-4-Open

Model number

PureSOx-Multi-4-Open

Engine power rating

90 MW

Throat diameter

2000 mm

Scrubbing water flow

1800 m3/h

Weight (dry)

130 t

Application

multi-stream scrubber, 4 engines; open-loop scrubber, seawater alkalinity

Operating modes

Open-loop, closed-loop, hybrid

Compliance

IMO MARPOL Annex VI 2020 sulphur cap

Operating mode

open-loop scrubber, seawater alkalinity

Mode suffix

Open

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Datasheet

PureSOx-Multi-4-Closed

Model number

PureSOx-Multi-4-Closed

Engine power rating

90 MW

Throat diameter

2000 mm

Scrubbing water flow

1800 m3/h

Weight (dry)

130 t

Application

multi-stream scrubber, 4 engines; closed-loop scrubber, NaOH dosing

Operating modes

Open-loop, closed-loop, hybrid

Compliance

IMO MARPOL Annex VI 2020 sulphur cap

Operating mode

closed-loop scrubber, NaOH dosing

Mode suffix

Closed

[08.08.2026] Datenblattlink entfernt (fehler 404): https://www.alfalaval.com/products/process-solutions/exhaust-gas-cleaning/puresox/

Datasheet

PureSOx-Multi-4-Hybrid

Model number

PureSOx-Multi-4-Hybrid

Engine power rating

90 MW

Throat diameter

2000 mm

Scrubbing water flow

1800 m3/h

Weight (dry)

130 t

Application

multi-stream scrubber, 4 engines; hybrid scrubber, switchable open/closed

Operating modes

Open-loop, closed-loop, hybrid

Compliance

IMO MARPOL Annex VI 2020 sulphur cap

Operating mode

hybrid scrubber, switchable open/closed

Mode suffix

Hybrid

[08.08.2026] Datenblattlink entfernt (fehler 404): https://www.alfalaval.com/products/process-solutions/exhaust-gas-cleaning/puresox/

Datasheet

Compass Water Solutions (formerly Oil Pollution Control) (USA)

Marine OWS Series

0.25-5.0 m³/h · Bilge Water / Oily Water

Type

Gravity + Coalescer + Absorption OWS

Size Range

CWS-250
CWS-500
CWS-1000
CWS-2500

Flow range (m³/h)

0.25
5.0

Power range (kW)

Drive Type

Electric

Construction

Multi-stage: gravity + coalescer + absorption polisher

Common Failures & Inspection Points

Absorption polisher exhaustion — replacement required
OCM calibration issues
Pump cavitation from debris

Service: Absorption polisher media replacement per running hours. OCM calibration monthly. Multi-stage system requires careful monitoring of each stage.

Spare Parts: Compass Water Solutions (Houston, TX). Lead time: 2-4 weeks. Absorption media: consumable, keep stock onboard.

Datasheet

Deckma Hamburg (Germany)

OMD Series (Oil Monitor/Detector)

0-50 ppm measurement range · Treated Bilge Water Effluent

Voltage: 24V DC / 230V AC

Type

Oil Content Monitor (IMO MEPC.107(49))

Size Range

OMD-24
OMD-24ex

Power range (kW)

0.05
0.1

Drive Type

Electric

Construction

IR absorption oil-in-water measurement

Common Failures & Inspection Points

IR window fouling from oil buildup
Calibration drift
Sample pump failure
Electronics sensitivity to humidity

Service: Window cleaning weekly. Calibration monthly. Zero-water test weekly. Annual service by Deckma-authorized technician.

Spare Parts: Deckma Hamburg. Lead time: 2-3 weeks. Keep onboard: cleaning kit, spare window.

Datasheet

Detegasa (Spain)

OWS Marine Series

0.25-5.0 m³/h · Bilge Water / Oily Water

Type

Gravity + Coalescer + Ultra-Filtration OWS

Size Range

DWF-250
DWF-500
DWF-1000
DWF-2500

Flow range (m³/h)

0.25
5.0

Power range (kW)

Drive Type

Electric

Construction

Multi-stage: gravity + coalescer + membrane filtration

Common Failures & Inspection Points

Membrane fouling requiring chemical cleaning or replacement
High-pressure pump failure on membrane stage
OCM calibration drift

Service: Membrane cleaning per manufacturer schedule. High-pressure pump maintenance quarterly. OCM calibration monthly.

Spare Parts: Detegasa (Vigo, Spain). Membrane modules: 4-6 weeks. Lead time: 3-6 weeks for standard parts.

Datasheet

DVZ-Services (Netherlands)

IMO-CLEAN Series

0.5-5.0 m³/h · Bilge Water / Oily Water

Type

Gravity + Coalescer OWS

Size Range

IC-05
IC-10
IC-25
IC-50

Flow range (m³/h)

Power range (kW)

Drive Type

Electric

Construction

Gravity + coalescer plates, compact

Common Failures & Inspection Points

Coalescer plate fouling from detergent contamination
OCM calibration drift
Discharge valve actuator failure

Service: Coalescer plate cleaning/replacement per schedule. OCM calibration monthly. Standard OWS maintenance.

Spare Parts: DVZ-Services (Rotterdam, Netherlands). Lead time: 2-4 weeks.

Datasheet

Facet International / Parker Hannifin (USA)

CLS Series (Coalescer/Separator)

0.5-10 m³/h · Bilge Water / Oily Water

Type

Coalescing + Gravity Separation

Size Range

CLS-25
CLS-50
CLS-100
CLS-200

Flow range (m³/h)

0.5
10.0

Power range (kW)

Drive Type

Electric (pump only)

Construction

Coalescing cartridges + gravity separation tank

Common Failures & Inspection Points

Coalescing cartridge plugging from heavy contamination
Separation efficiency drop with emulsified oils
OCM sensor drift

Service: Coalescing cartridge replacement per differential pressure indicator. OCM calibration monthly.

Spare Parts: Parker Hannifin filtration division. Coalescing cartridges: keep 2 sets onboard. Lead time: 2-4 weeks.

Datasheet

Jowa (Sweden)

OWS / OCM Series

0.5-5.0 m³/h · Bilge Water / Oily Water

Type

Gravity + Coalescer OWS with integrated OCM

Size Range

Jowa OWS 0.5
Jowa OWS 1.0
Jowa OWS 2.5
Jowa OWS 5.0

Flow range (m³/h)

Power range (kW)

Drive Type

Electric

Construction

Gravity separation + coalescer + OCM

Common Failures & Inspection Points

OCM window fouling causing false readings
Coalescer element degradation
Bilge pump air lock from empty bilge well
Solenoid valve failure on 3-way valve

Service: OCM window cleaning weekly. Coalescer replacement per running hours. OCM calibration monthly. MARPOL compliance documentation.

Spare Parts: Jowa (Gothenburg, Sweden, part of Atlas Copco group since 2022). Lead time: 2-4 weeks.

Datasheet

Marinfloc (Sweden)

MF Series

0.5-5.0 m³/h · Bilge Water / Oily Water

Type

Chemical Flocculation + Flotation OWS

Size Range

MF 0.5
MF 1.0
MF 2.5
MF 5.0

Flow range (m³/h)

Power range (kW)

Drive Type

Electric

Construction

Chemical dosing + flotation tank + 15 ppm OCM

Common Failures & Inspection Points

Chemical dosing pump failure or misdosing
Flocculation chemical supply exhaustion — requires regular replenishment
Flotation tank foam overflow
OCM calibration drift

Service: Chemical supply level check weekly. Dosing pump calibration monthly. OCM calibration monthly. Sludge removal from flotation tank regularly.

Spare Parts: Marinfloc (Gothenburg, Sweden). Chemicals must be ordered regularly. Lead time: 2-4 weeks for parts, 1-2 weeks for chemicals in major ports.

Datasheet

Rivertrace (UK)

Smart Series OCM + OWS

0-50 ppm OCM / 0.5-5.0 m³/h OWS · Bilge Water / Oily Water

Type

Oil Content Monitor + OWS System

Size Range

Smart OCM
Smart OWS 0.5
Smart OWS 1.0
Smart OWS 2.5

Flow range (m³/h)

Power range (kW)

Drive Type

Electric

Construction

Fluorescence-based OCM + gravity/coalescer OWS

Common Failures & Inspection Points

Fluorescence sensor window fouling
Calibration drift — requires regular zero-water check
Flow cell blockage

Service: Sensor window cleaning weekly. Calibration check monthly. Annual service by Rivertrace-certified engineer.

Spare Parts: Rivertrace (Southampton, UK). Lead time: 2-4 weeks.

Datasheet

RWO / Veolia (Germany/France)

SKIT/S Series

0.25-5.0 m³/h · Bilge Water / Oily Water

Type

Gravity + Coalescer OWS with 15 ppm OCM

Size Range

SKIT/S 0.25
SKIT/S 0.50
SKIT/S 1.0
SKIT/S 2.5
SKIT/S 5.0

Flow range (m³/h)

0.25
5.0

Power range (kW)

Drive Type

Electric (pump + OCM only)

Construction

Gravity separation + coalescer plates + 15 ppm OCM, modular

Common Failures & Inspection Points

Coalescer plate fouling from detergent-contaminated bilge water
OCM sensor drift — regular calibration mandatory
Bilge pump cavitation from debris blockage
3-way recirculation valve failure

Service: Coalescer plate cleaning/replacement every 1,000-3,000 hrs. OCM calibration monthly. Pre-settling of bilge water recommended. MARPOL Oil Record Book entries mandatory.

Spare Parts: RWO/Veolia (Bremen, Germany). Coalescer plates: keep 1 set onboard. OCM parts: 2-4 weeks. Lead time: 2-4 weeks.

Datasheet

SKF / Blohm+Voss (Germany/Sweden)

Marine OCM (Oil Content Monitor)

0-50 ppm measurement range · Treated Bilge Water Effluent

Voltage: 24V DC

Type

Oil Content Monitor (IMO MEPC.107(49))

Size Range

OCM-15
OCM-15E

Power range (kW)

0.05
0.1

Drive Type

Electric (24V DC)

Construction

Optical/infrared oil-in-water measurement, flow cell

Common Failures & Inspection Points

Optical window fouling from oil film buildup — most common issue
Calibration drift requiring monthly recalibration
Flow cell blockage from debris
Electronics board failure from humidity/vibration

Service: Optical window cleaning weekly. Calibration check monthly. Zero-water reference check weekly. IMO requires annual verification by authorized service engineer.

Spare Parts: Various OCM manufacturers (Jowa, RWO, Rivertrace). Keep onboard: cleaning kit, spare lamp/LED. Lead time: 2-4 weeks.

Datasheet

Victor Marine (UK)

VMS Series

0.25-5.0 m³/h · Bilge Water / Oily Water

Type

Gravity + Coalescer OWS with 15 ppm OCM

Size Range

VMS 0.25
VMS 0.50
VMS 1.0
VMS 2.5
VMS 5.0

Flow range (m³/h)

0.25
5.0

Power range (kW)

Drive Type

Electric (pump only)

Construction

Gravity + coalescer, compact design

Common Failures & Inspection Points

Coalescer cartridge clogging from detergent contamination
OCM sensor fouling
Bilge pump suction strainer clogging
3-way valve actuator failure

Service: Coalescer cartridge replacement every 1,000-2,000 hrs. OCM calibration monthly. Pre-filtering recommended.

Spare Parts: Victor Marine (Wigan, UK). Lead time: 2-4 weeks. Coalescer cartridges: keep 2 sets onboard.

Datasheet

Wärtsilä

BOSS Series (Bilge Oily-Water Separator System)

0.5-5.0 m³/h · Bilge Water / Oily Water

Type

Gravity + Coalescer OWS

Size Range

BOSS 0.5
BOSS 1.0
BOSS 2.5
BOSS 5.0

Flow range (m³/h)

Power range (kW)

Drive Type

Electric

Construction

Gravity + coalescer cartridges, compact

Common Failures & Inspection Points

Coalescer cartridge clogging
OCM fouling
Pump seal failure
3-way valve actuator issues

Service: Coalescer cartridge replacement per running hours. OCM calibration monthly. Originally Hamworthy — service now through Wärtsilä.

Spare Parts: Wärtsilä service network. Lead time: 2-4 weeks. Coalescer cartridges: keep 2 sets onboard.

Datasheet