Heavy Marine Transportation

What is heavy marine transportation engineering

Engineering for moving oversized, heavy, or high-value cargo by sea — including sea fastening and grillage design.

Heavy marine transportation covers the engineering required to move oversized cargo by sea — offshore modules, reactor vessels, floating structures, and project cargo that exceeds standard container or breakbulk dimensions. Every voyage involves unique cargo geometry, high centre-of-gravity loads, and voyage-specific stability and securing assessments. The engineering is critical for safe delivery, marine warranty approval, and insurance compliance.

Who needs heavy transport engineering

• EPC contractors shipping large fabricated modules from yard to project site
• Heavy-lift vessel operators needing voyage-specific stability and structural verification
• Project owners requiring third-party transport engineering for marine warranty survey
• Freight forwarders and logistics providers arranging multimodal heavy transport involving a sea leg

Scope of work

• Voyage-specific stability analysis — intact and damage conditions
• Motion and acceleration analysis for the proposed route and season
• Sea fastening and grillage design — stoppers, lashings, weld detailing, and load distribution
• Deck strength verification — local and global structural checks
• Ballast and loading sequence planning

Sea fastening design is a core part of the transport engineering scope — ensuring heavy cargo remains securely fixed to the deck under the combined effects of vessel motions, wind loads, and green water. The design covers stopper arrangement, grillage sizing, lashing component specification, and deck strength checks, all benchmarked against the vessel’s design accelerations and classification society criteria.

Project experience

Reactor vessel transport — sea fastening design for two reactor tanks transported on a deck cargo barge, including stopper arrangement, grillage design, and deck strength verification.

Offshore module transport support — transport engineering for module shipments in Southeast Asia, covering stability analysis and securing design.

Quayside load-out support — ballast planning and load-out procedure review for quayside-to-barge operations.

Frequently asked questions

What is marine warranty survey and when is it required?

Marine warranty survey is an independent third-party review of the engineering and readiness for a marine operation. It is typically required by project insurers and is common for high-value or non-routine transport, lifting, and installation scopes.

What information do you need to start?

Cargo details (weight, dimensions, centre of gravity), proposed route and season, and the transport vessel or barge particulars — including general arrangement, stability booklet, and deck strength data.