"> Alfa Laval S.p.A. PureSOx-Multi-4
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Alfa Laval S.p.A.

PureSOx-Multi-4

The Alfa Laval S.p.A. PureSOx-Multi-4 is part of the PureSOx wet marine exhaust-gas cleaning system family used to reduce sulphur oxides in engine exhaust. Despite the category shown in the supplied equipment list, PureSOx is an exhaust-gas cleaning system rather than an oily water separator. Wash water contacts the exhaust gas so sulphur compounds are transferred from the gas stream into the liquid phase before the cleaned exhaust is discharged through the vessel's exhaust system. The Multi designation belongs to a PureSOx arrangement intended for vessel-specific integration of more than one exhaust source; the exact source count and duct arrangement must be confirmed from the project documentation. The exact operating arrangement of this unsuffixed entry—open-loop, closed-loop, hybrid or hybrid-ready—must be confirmed from the vessel-specific PureSOx documentation. The model suffix must not be used to infer a verified engine-power rating, gas-flow capacity or water-flow requirement; refer to the manufacturer documentation for the exact figure.

Alfa Laval S.p.A. PureSOx-Multi-4

Components & Design

Component data being added…

Technical Data

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

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Common failures & inspection points

Insufficient wash-water flow caused by pump faults, blocked strainers or restricted piping produces deteriorating scrubbing performance and process alarms
Fouled or damaged spray and distribution components cause uneven gas cleaning, abnormal temperatures or unstable emission readings
Failed pH, turbidity, flow, pressure or emission-monitoring instrumentation causes implausible values, compliance alarms or loss of automatic control
Deposits, corrosion or erosion in the scrubber, drains and associated piping cause leakage, restriction or increasing exhaust backpressure
Control-valve, actuator, dosing or automation faults prevent correct routing or conditioning of wash water and can force the system out of compliant operating mode

Service & Maintenance

Review emission and wash-water monitoring trends and compare them with the approved operating record rather than relying only on instantaneous values. Inspect scrubber internals, drains, piping, pumps, strainers, spray equipment and valves for deposits, corrosion, erosion and leakage during planned shutdowns. Verify calibration and condition of compliance-monitoring instruments and check valve-position feedback, interlocks and bypass arrangements where fitted. Closed-loop and hybrid systems require additional attention to circulation-water chemistry, dosing and water-cleaning equipment; all acceptance limits and calibration intervals must come from the approved manufacturer and statutory documentation.

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Replacement Parts

Carry critical wash-water pump seals and service parts, strainer elements, valve-actuator and seal components, approved sensor consumables and calibration items, representative process transmitters where operationally justified, spray/distribution parts where replaceable, control-system fuses and corrosion-resistant gaskets matched to the installed configuration. Closed-loop or hybrid plants should additionally carry configuration-specific dosing and water-cleaning consumables specified by the manufacturer.
Equipment Model #153902 · ✓ still in production