Lube oil treatment on 2-stroke diesel engines | container vessels

System: Marine diesel engines

Ship: Container ship CMS “HONG KONG EXPRESS” and CMS “HAMBURG EXPRESS”, 13,177 TEU each

Main engines: MAN 11K98 ME MK 7.1 2-stroke diesel engines (throttled to 45,100 kW at 84 rpm since 2017), low-speed 2-stroke diesel engines

Operating hours: approx. 8,000 Rh/year

Lubricating oil, “HONG KONG EXPRESS”: Mobilgard 300, 11.9 cSt @ 100 °C

Lubricating oil, “HAMBURG EXPRESS”: LukOil Navigo 6 SO, 11.5 cSt @ 100 °C

Oil volume: 70 m³ (1.2 l/kW _MCR)

Tests: conventional systems vs. CJC® Lube Oil Filters

Test period: 45 weeks

Engine running time: 5,244 operating hours during the test period

Test start: approx. 24,556 operating hours

Test end: approx. 29,800 operating hours

Conventional lubricating oil treatment: Two systems per main engine.

Newly installed CJC® lube oil filters: One CJC® Lube Oil Filter 3×427/81 for continuous fine filtration and dewatering (24/7/365) per main engine was installed. The four conventional systems for lube oil treatment weren’t in operation throughout the test period. Pump flow: 3,000 litres/hour Filter material: 100 % natural fibers (cellulose) Filter fineness: 3 µm absolute, 1 µm nominal

Optional with oil condition monitoring The implementation of a CJC® Oil Condition Monitoring System on the Hong Kong Express enables the transmission of exact oil condition values to the ship’s bridge in real time. The sensor package detects differential pres-sure, temperature, relative humidity (RH %), and particle content according to ISO 4406. Deviations from the normal condition and harmful effects can be indicated at the earliest and enable counteracting – timely, cost-efficient and projectable.

Approval from MAN Energy Solutions

No Objection Letter for CJC® Lube Oil Filter CJC® filter type: Marine Lube Oil Purifier 27/ or 427/ with LOX filter elements Two-stroke engines: All types and fuels

„Tests on several ships using an off-line lubrication filtration unit with a CJC® Filter as the only cleaning unit (without centrifugal operating) have shown positive results […].“

Result of the new lube oil treatment

The weekly oil samples were analyzed in two independent laboratories (Filtrex, AlControl/Synlab). The oil condition was rated as “normal” during the entire test period:

• particle and water content minimized
• stable viscosity
• stable base number (TBN)
• no impact on additives

The spot test (see photos on the right) shows that the lubricating oil was still heavily contaminated with dust, metal abrasion and other particles > 1 µm before and at the start of the test period. Additionally, oil ageing processes (membrane colour: brown) and water ingress impact the oil (serrated border zone). Thermal load on so-called hot spots (e. g. bearings) and particles from component wear (copper, iron, aluminium) accelerate the degradation of the base oil and the additives and thus oil ageing processes. The oil was not contaminated with fuel. The oil was not contaminated with fuel. The efficient oil care with CJC® has significantly improved the oil cleanliness and dispersancy throughout the test period (see pictures on the right side). The CJC® Marine Lube Oil Purifier removes continuously and permanently particles, free, emulsified and dissolved water, oil ageing products, and acids from the engine lube oil. The conventional system has only removed particles and free water.

Savings

Approx. 98% lower lubricating oil losses in relation to lubricating oil treatment ≈ 9,846 liters of oil per year and ship

Thanks to the CJC® Lube Oil Filter, Hapag-Lloyd saves 9,856 liters of lube oil per year and ship simply as a result of lower lube oil losses: Oil losses due to filter insert replacement (CJC® Lube Oil Filter): only 144 litres/year

Approx. 97% lower energy requirement in relation to lubricating oil treatment ≈ 332,725 kWh per year and ship

Thanks to the CJC® Lube Oil Filter, Hapag-Lloyd saves 332,725 kWh per year and ship simply as a result of the lower energy requirement: Energy consumption of the CJC® Marine Lube Oil Purifier:only 10,253 kWh per year

Fewer emissions during berthing times in the port

When using the systems for conventional lubricating oil treatment, the steam required to preheat the lubricating oil (heating capacity 9 kW) from 36 °C to 92 °C must be generated by the boilers during the idle times in the port. When using CJC® Marine Lube Oil Purifier, the lube oil preheating is unnecessary. The result is that no fuel has to be burned in the auxiliary boilers during port times — i. e. drastically savings of fuel and fewer emissions.

Approx. 96% less CO₂ emissions in relation to lubricating oil treatment ≈ 154,535 kg CO₂ per year and ship

The extreme discrepancy between the two systems in terms of energy consumption and lube oil losses enables Hapag-Lloyd to significantly improve the CO₂ footprint of the CMS “HONG KONG EXPRESS” and CMS “HAMBURG EXPRESS” when using the CJC® Lube Oil Filter. The combustion of 1 liter of fuel or the thermal disposal of 1 liter of used oil/oil sludge produces approx. 2.6 kg of_CO2.

• Less CO₂ emissions due to lower energy requirements CJC® Lube Oil Filter: only 6,247 kg CO₂/year Operation: 6,247 kg CO₂/year (2,403 l fuel/year x 2.6 kg CO₂/liter) * * 240 days shaft generator system, HS-HFO (950 g/l), specific consumption 0.221 l/kWh and 116 days auxiliary diesel, MDO (880 g/l), specific consumption 0.261 l/kWh

• Less CO₂ emissions due to lower oil losses: CJC® Lube Oil Purifier: only 374 kg CO₂/year 144 l oil loss due to insert replacment/year x 2.6 kg CO₂/liter

Customer comment

„The CJC Lube Oil Purifier is proven as a reliable and efficient alternative for lube oil treatment during the excessive test periods on both vessels, which MAN Energy Solutions accompany. Due to the continuous oil care, the oil cleanliness and the lube oil’s performance are kept in the specified areas (viscosity, additives, base number, particle and water content) or were improved (e. g., dispersancy). The high savings potential regarding oil losses, energy costs and CO₂emissions is convincing – even as a retrofit. An easy system with a large effect.“

Superintendent, Hapag-Lloyd AG