Blending On Board system

A system and support service to optimize overall engine lubrication performance and costs.

Engine operational versatility, in terms of the operating load and heavy fuel oil quality, has a profound effect on operating costs. Furthermore, constraints related to emission controlled areas and new fuel regulations call for more flexibility while maintaining reliable engine performance.

High sulphur fuel and harsh operating conditions require increased cylinder oil performance for neutralization, detergency and dispersancy. Extended engine operation with low sulphur fuel, or even Marine Diesel Oil or Marine Gas Oil, is also required. These conflicting requirements are usually addressed by using two cylinder oils (typically 40BN and 70BN) and a sulphur dependent feed rate adjustment, according to the engine manufacturer’s recommendation. This is to be able to cope with the variability of the fuel’s sulphur content, particularly when in reduced load operation.

The Wärtsilä Blending on Board system provides a unique, flexible solution to these challenging requirements. The concept is to keep the constant low cylinder oil feed rate optimal, while adjusting the base number (30-120 BN) according to the fuel sulphur content in relation to the relevant regulations and the engine operational load pattern.

Additional significant advantages of the BOB system include the replenishment of the main engine with new system oil, and the auxiliary 4-stroke engine oil with new lubrication oil. The XRF analyzer will also allow a continuous monitoring of various engine fluids, including an analysis of the true FE content for both corrosive and abrasive iron wear.

    • By producing blended cylinder oil from used system oil plus additives, the costs compared to using commercial cylinder oil are reduced.
    • The optimal constant low cylinder oil feed rate is obtained by variable BN blending to match the fuel sulphur content.
    • Engine “cleanliness” and a reduction of deposits (crankcase, liners, piston rings, reduced system oil separator operation, maintenance) due to the regular replenishment of new system oil in both the main and auxiliary engine.
    • Reduced frictional losses with positive effects on fuel oil consumption.
    • The re-use of used system oil instead of its disposal reduces overall lube oil consumption and the use of BN.
    • Additives bunkered for a minimum of one year’s operation creates operational flexibility as there is no need to buy commercial cylinder oil in expensive ports.
    • Improved supply security by sourcing of the system oil.
    • Positive environmental impact (harmful metals reduced through BN optimization, low emissions)
    • Payback time on investment is within 2 years, depending on the engine type and operating conditions.
    • Controlled cylinder liner and ring wear during harsh operating conditions, such as slow steaming.
    2-stroke engines


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