Cost Savings with New Wärtsilä Cylinder Lubricating System
Wärtsilä Corporation has introduced a new, electronically-controlled cylinder lubricating system to meet the demand for lower cylinder oil feed rates: the Pulse Lubricating System (PLS). Developed for application in Wärtsilä RTA and RT-flex low-speed marine diesel engines, it delivers reduced cylinder oil consumption without compromising piston-running reliability.
The Pulse Lubricating System makes it possible to reduce the cylinder oil feed rate compared with the existing accumulator system through an improved distribution of cylinder lubricating oil to the cylinder liner, and the fully flexible, precise timing of oil delivery.
The guide feed rate for Wärtsilä RTA and RT-flex engines equipped with the Pulse Lubricating System as original equipment is 0.7 g/kWh of cylinder lubricating oil. Thus the cost savings achievable with the Pulse Lubrication System are significant. In the case of a 12-cylinder Wärtsilä RT-flex96C engine of 68,640 kW maximum continuous output, running at 85% load for 7000 hours a year with cylinder oil costing US$ 1700/tonne, the reduction from the guide feed rate of 1.1 g/kWh (0.8 g/bhph) with the existing accumulator system to the new guide feed rate of 0.7 g/kWh (0.5 g/bhph) can generate cost savings of more than US$ 270,000 a year. This corresponds to a cost saving of about 36% for cylinder lubricating oil.