The widespread adoption of LNG as fuel is facing a number of challenges one of which is the varying composition of LNG fuel globally.
These differences could lead to engine damage and failure, according to a statement by the classification society DNV GL, that developed the PKI methane number calculator which would enable matching the fuel quality with the specific engine’s requirements.
DNV GL’s senior vice president, oil & gas, Liv Hovem , said, “As LNG is produced at different locations around the world, using an assortment of production technologies, its composition can vary considerably.”
Hovem noted that mismatching the fuel quality to a specific ship engine can cause potentially dangerous effects such as significant loss of performance, engine shutdown and even damage.
Engine knock is characterized by auto-ignition of the unburned fuel mixture, known as the end gas, ahead of the propagating flame in the engine cylinder. The knock resistance of LNG is characterized by a methane number, similar to the octane number used in gasoline engines.
In addition to the PKI methane number calculator, DNV GL launched a joint industry project to develop tools to support customers in investment decisions on the design of small-scale LNG distribution infrastructure. The project will perform economic and supply chain optimization analyses to improve knowledge on LNG transportation, storage, quality, and safety.