"> IMO AB (Colfax) ACE Serie
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IMO AB (Colfax)

ACE Serie

IMO AB (Sweden, founded 1931, part of Colfax Fluid Handling since 2017) is world market leader for three-screw pumps in marine and energy sectors. The ACE series is the standard configuration for HFO transfer, booster, fuel supply to main engines and lube oil service on virtually all medium to large merchant vessels. Characteristic is the robust three-screw design with hardened, nitrided shafts for long service life with dirty HFO. In production since 1985 in current frame sizes and is standard equipment on many newbuildings.

IMO AB (Colfax) ACE Serie
5-300 m³/h
Capacity
HFO/MDO/MGO/Lube Oil
Medium

Components & Design

Component data being added…

Technical Data

pump type Three-screw positive displacement pump
variant count approx 80
period start year 1985
drive type Electric
construction Cast iron casing, hardened nitrided screws

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Common failures & inspection points

●Cat-fines induced screw scoring after 8000-15000h with poor HFO purification
●Mechanical seal leakage at shaft after 8000h
●Relief valve sticking from sludge/varnish buildup
●Bearing wear after operation with low-viscosity MGO without viscosity correction

Service & Maintenance

Major overhaul every 25000h. Mechanical seal at 8000h. Relief valve test annually. Daily: discharge pressure log, suction strainer check.

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Replacement Parts

Maintain mechanical seal kit, complete screw set, bearing kit, relief valve cartridge. Lead time IMO 8-12 weeks for screw sets — keep onboard for critical fuel oil supply.
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Equipment Model #37558 · ✓ still in production