Lloyd’s Register issues retrofit guidance

Lloyd’s Register (LR) has published new guidance notes addressing the growing complexity of retrofitting existing vessels with alternative fuels and energy-saving technologies as shipping faces mounting decarbonisation pressures.

Regulatory and commercial drivers, including FuelEU Maritime, the Carbon Intensity Indicator and the IMO’s greenhouse gas reduction ambitions, are increasing interest in retrofits to improve efficiency, cut emissions and extend vessel service lives.

“With much of the global fleet expected to remain in service well into the next decade, retrofit projects will play a critical role in shipping’s decarbonisation journey,” said Paul Herbert, principal technology specialist at LR.

“The challenge is no longer identifying technologies, but understanding how those technologies can be safely, practically and economically integrated into existing ships while meeting increasingly demanding regulatory requirements.”

The publication brings alternative fuels and energy-saving devices together within a single framework, covering conversions to LNG, methanol, ethanol, ammonia, hydrogen and LPG, alongside wind-assisted propulsion systems and air lubrication systems.

LR highlights the importance of making key technical decisions early. Engine compatibility, fuel storage capacity, tank positioning, onboard space, fuel-system integration and project execution can significantly affect costs, schedules and operational performance.

The guidance also stresses early collaboration between shipowners, shipyards, equipment manufacturers, flag administrations and classification societies to minimise project risks and avoid delays.

Energy-saving technologies offer additional opportunities. Wind-assisted propulsion systems, for example, can benefit from a reward factor under FuelEU Maritime that recognises their contribution to reducing greenhouse gas intensity.

However, successful retrofits require more than equipment installation. Crew training, revised operating procedures, updated safety management systems and comprehensive risk assessments are essential, particularly when introducing ammonia and hydrogen, which present new safety challenges.

Herbert said the guidance provides a practical framework for evaluating options and delivering projects, helping owners make informed decisions as the range of available fuel and efficiency solutions expands.