Propulsion Management

Summary  As two-stroke marine engines operate under increasingly diverse conditions from a diverse range of fuel types to varying operating conditions and slow steaming, cylinder lubrication systems face new demands. This article outlines key lubrication principles, typical wear mechanisms, and the importance of matching oil feed strategies to evolving fuel and load profiles. It also presents how advanced systems such as HJ Read more

Simulation meets practice  Flora’s research investigates how lubrication and airflow interact in large two-stroke marine engines — a field where advanced simulation meets real-world engineering. Her two recent publications represent significant contributions to this area: the first analyses scavenging airflows using varied turbulence models, providing insights into airflow dynamics and oil–air interactions in full-scale two-stroke engines; the second computationally studies Read more

 Until now, installing SIP valves has required several days of immobilization or has been limited to installation during dry dock. Top cover removal and internal liner machining were unavoidable, making retrofits expensive and infrequent. With SIP+, preparation can be done while the vessel is at sea and the final installation conducted during a normal port Read more

“SIP+ takes a proven technology and makes it easier and faster to install,” says Mark Kristensen, Head of Sales at HJ Lubricators. “We achieve the same optimal lubrication at low feed rates without machining inside the cylinder – saving both time and cost for shipowners.”  Improved performance and lower emissions The SIP+ valve maintains all the Read more