Future Ready: Carbon Capture and Energy Efficiency Solutions

Challenge

A major shipowner was developing two newbuild container vessels (9000 and 9200 TEU) amid rapidly evolving International Maritime Organization (IMO) emission regulations. With stricter emissions requirements ahead, the client needed to identify technologies that would keep the vessels compliant over their full service life.

This required clear guidance on machinery, hull features and systems that could deliver real fuel savings, reduce emissions and support long term competitiveness, while remaining aligned with future decarbonisation goals. The key questions were which Carbon Capture Systems (CCS) technologies were mature enough for onboard installation; and which Energy Saving Devices (ESD) & Energy Efficient Technologies (EET) could be integrated without affecting vessel performance. With technologies at varying stages of readiness, the client needed clarity on maturity, integration and operational impacts to support compliance planning and investment decisions.

Approach 

LR delivered the work through detailed collaboration, shipboard visits andtechnical workshops with Carnival’s engineering teams in Miami, Southampton and Marseille, as well as at Carnival’s training centre, CSMART Academy.

A highly detailed Inspection and Test Plan was defined well in advance of the surveys, covering LNG system components down to individual valves requiring overhaul. Survey and maintenance sequences were structured around each vessel’s operational profile.

LR provided technical guidance to support execution of these activities, including system isolating diagrams and detailed survey and maintenance planning, and has since been contracted to deliver a dedicated safety risk study to support this work.

The LNG renewal surveys could not be completed within the dry-dock period alone and required execution while the vessel was at sea and carrying passengers. With approximately 50% of the LNG system remaining operational during these activities, this introduced additional complexity from both a safety and planning perspective.

Preparation for post-dock bunkering needed to begin midway through the docking period. For Iona, continuous LNG capability was maintained to support Norwegian fjord operations and NOx Tier III compliance, requiring precise sequencing of maintenance and recommissioning activities.

Mardi Gras retained one fully operational LNG fuel tank and propulsion line during the transit from Cape Canaveral to Marseille, following discussions with the Bahamas Maritime Authority regarding Safe Return to Port parameters. Inspection and maintenance tasks were staged to maintain uninterrupted system availability.

In-service inspections were carefully coordinated while passengers were on board, with all procedures subject to risk assessment and validation by ship staff, client engineering teams and LR surveyors.

Solution

Lloyd’s Register (LR) Advisory engaged early through its Cruise Ship Centre of Expertise (CCoE), a global model bringing together operational specialists, in
service and newbuilding SMEs, and Technical Support Office (TSO) personnel. This provided structured technical leadership and coordinated global survey oversight, with focused support for the specific challenges of the cruise sector.

Starting 18 months in advance, LR worked closely with the clients to understand operational profiles, maintenance challenges and dry-docking constraints.

Optimised survey schedules were agreed in advance and aligned with vessel-specific requirements.

The CCoE provided:

• Central coordination of inspection and test planning
• Technical alignment between LR survey policy, shipboard teams and shore-based technical offices
• Structured risk assessment and validation of isolation, venting and access arrangements
• Multi-location survey support from LR offices in 
  Miami, Marseille, Gdansk and Rotterdam.

This framework established a disciplined and anticipatory approach to LNG renewal activity.

Outcome

All inspections and renewal surveys were completed safely, on time and to the satisfaction of all parties. The projects established a structured methodology for LNG dry-docks, integrating early planning, long-lead spare forecasting, global 
survey coordination and operationally aligned maintenance sequencing.

For Carnival Corporation, the renewal surveys provided greater predictability in LNG overhaul activities and strengthened planning discipline for future dry-dock cycles across its LNG-fuelled fleet.

The experience also generated practical insight into the inspection, testing and recommissioning of complex LNG systems under real operational constraints.

Conclusion

Delivered through LR’s CCoE, the projects show how coordinated technical oversight can manage LNG renewal activity within operational constraints. As LNG-powered vessels enter successive dry-dock cycles and alternative fuel technologies evolve, this experience offers a practical reference for operators seeking disciplined preparation and independent technical guidance across the cruise sector.