"> Alfa Laval S.p.A. MMPX-403-HFO-Purifier
OceanSphere
Engines
⚓ Working on this equipment?
Ask the AI troubleshooter, log your hours on board and turn them into invoice-ready service reports — for this exact model.
Start free — 14 days →
No credit card required
🔧 80 verified suppliers & service companies for Alfa Laval S.p.A. in the Maritime Network Find suppliers →
Is Alfa Laval S.p.A. your company? Claim this page
Alfa Laval S.p.A.

MMPX-403-HFO-Purifier

The Alfa Laval S.p.A. MMPX-403-HFO-Purifier is a compact high-speed disc-stack oil separator configured for heavy fuel oil purification. It is normally installed in the engine-room fuel treatment plant between dirty-fuel storage or settling arrangements and the clean-fuel/service side. Its purpose is to use centrifugal separation to remove free water and suspended solids from the fuel before it reaches downstream fuel-system equipment. Heavy fuel oil normally requires suitable conditioning and heating before separation, while the exact inlet condition must follow the manufacturer documentation for the installed machine. The MMPX family is used in packaged oil-separation systems; the exact bowl, operating-water and discharge sequence depends on the installed specification. Compared with a clarifier version of the MMPX-403, this purifier configuration is intended to separate a water phase as well as solids. Exact capacity, interface control, operating temperature, gravity-disc or equivalent setup, and other model-specific limits must be taken from the manufacturer documentation and nameplate.

Components & Design

Component data being added…

Technical Data

Model number MMPX-403-HFO-Purifier
Capacity (HFO) 4000 l/h
Capacity (lube oil) 3200 l/h
Bowl diameter 360 mm
Motor power 7.5 kW
Application mid-size purifier, optimised for heavy fuel oil purification
Drive type Direct / gear-driven
Bowl type Self-cleaning disc-stack
Fuel type optimised HFO
Capacity (at optimum fuel) 4000 l/h

🤖 Ask about this model

One free question — answered like a marine engineer. No account needed.

Common failures & inspection points

●Incorrect purifier interface or bowl setup caused by unsuitable configuration for the actual fuel, producing water carry-over in the clean oil or oil loss to the water side
●Insufficient fuel heating or poor upstream conditioning, producing high viscosity and reduced separation efficiency
●Heavy sludge accumulation in the bowl or disc stack, producing reduced throughput, poor separation or increasing vibration
●Worn spindle, bearings, drive components or bowl parts, producing abnormal noise, vibration or unstable running
●Damaged seals, restricted passages or malfunctioning operating-water components where fitted, producing leakage, unstable discharge behaviour or failed separation

Service & Maintenance

Inspect the bowl, disc stack, sludge space and all wetted passages for heavy deposits, erosion, corrosion and mechanical damage. Verify the purifier-specific bowl arrangement and all interface-setting components after every major opening. Check fuel preheating, feed stability, water outlet behaviour and clean-oil quality during operation. Inspect spindle, bearings, drive train, seals and any operating-water or discharge mechanism fitted to the exact specification. Use the manufacturer manual for exact assembly sequence, wear limits, tightening values, process settings and service intervals.

Suppliers & Spare Parts

Direct links to manufacturer, datasheet, spare-parts portal and dealers — request access below.

📄 Request sourcing links & documents
🛠 Manage this equipment in your fleet

Cases, daily reports, timesheets and AI troubleshooting in the OceanSphere Marine app — free for 14 days.

Start free trial →
🔎 Suppliers & service for this equipment

Find manufacturers, repair shops and spare-part dealers in the Maritime Network — our global company directory.

Maritime Network →

Replacement Parts

Carry the manufacturer-specified service kit for the exact separator serial number, including routine seals and O-rings. Depending on the installed design and vessel redundancy, useful spares can include bearings, drive components, bowl seals, operating-water valve parts and other specified wear items. Do not assume interchangeability between similar MAPX, MOPX, WHPX, MMPX, MAB or MMB models without confirmation from the parts documentation.
Working on this unit?
Log hours, photos and findings into an invoice-ready service report — OceanSphere Marine, 14-day free trial.
Need a service partner for Alfa Laval S.p.A.?
114,000+ shipyards, suppliers and service companies in the Maritime Network directory.
Equipment Model #153302 · ✓ still in production