Large container ship at sea illustrating marine hydraulic control and engine lubrication systems.

Eliminated failures in the hydraulic control system of a MAN engine

Fine filtration removed particles, oil degradation and water from the hydraulic oil, restoring reliable operation.

Case study written by Andreas Man, Karberg & Henneman, Germany

Application Snapshot

Factory icon representing industrial application or sector.

Industry:

Marine

Country:

Germany

Oil type:

Hydraulic oil (Mobilgard 300)

Executive summary

Problems were identified in the hydraulic control system of the main engine, and oil analysis showed high contamination with water and particles in the hydraulic oil.

After installation of a CJC® Fine Filter on the hydraulic system, particles, oil degradation and water were removed from the oil and no further failures were reported. Identical oil filters were subsequently installed on the other seven ships of the same class.

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Gear with checkmark icon representing elimination of failures in the hydraulic control system.

Eliminated system failures

Since installation, there have been no failures in the hydraulic control system.

Trophy icon representing fulfilment of ME-hydraulic system requirements.

ME-hydraulic system requirements met

The requirements of the ME-hydraulic system are now met.

Cylinder icon representing improved hydraulic oil condition after removal of particles, water, and degradation products.

Improved oil condition

Particles, oil degradation and water removed from the hydraulic oil.

Proven across the fleet

Identical oil filters installed on the other seven ships of this class.

Engine room with a large marine MAN main engine and hydraulic control system components.

Client brief

The container vessel MS Colombo Express, operated by Hapag-Lloyd, is equipped with a MAN 12 K 98 ME-C6 main engine using hydraulic control of the fuel injection pump and exhaust valves.

Oil samples showing contaminated hydraulic oil with visible water and discolouration.

Challenge

Because of problems in the hydraulic control system, an oil sample was taken. The oil analysis showed high contamination with water and particles.

CJC® Fine Filter installed for hydraulic oil cleaning on a marine engine control system.

Solution

A CJC® Fine Filter HDU 427/81 MZ was installed with 12 CJC® B 27/27 Filter Inserts (3 µm absolute) and a pump capacity of 1,510 l/h at 60 Hz. The CJC® Fine Filter removed particles and oil degradation products from the oil and reduced the water content.

Production line with stacked circular filter inserts used for offline fine filtration systems.

Restoring engine cleanliness with offline fine filtration

After installation of the CJC® Fine Filter, the system operated continuously on the main engine. After 18 days and 70 engine running hours, an oil sample was sent for independent analysis.

The results confirmed a rapid reduction in insolubles, while physical inspection showed that accumulated sludge inside the engine had already started to disappear.

Measurable results and operational impact

The installation of the CJC® Fine Filter removed particles, oil degradation and water from the hydraulic oil and ensured that the requirements of the ME-hydraulic system were met. The convincing results prompted Hapag-Lloyd to install identical filters on the other seven ships of this class, confirming the effectiveness of the solution.

“Nothing but the installation of the CJC® Fine Filters enabled us to meet the requirements of the ME-hydraulic system.”

– Lars Voß, Technical Inspector of the shipping company

Table showing reduction in particle counts, ISO cleanliness code, and water content after installation of offline fine filtration.

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