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Longitude provides construction companies with marine support throughout projects

Infrastructure & Construction Sectors

Longitude’s projects, to date, have included the design, fabrication, and shipping of modular equipment for numerous LNG plants, on-shore refineries, mining equipment – and even glass roof sections for a major immigration building.

These projects typically involve the offshore shipment of multiple modular structures by either a combination of tug and flat-top-barge, or by self-propelled vessels through routes between continents. Longitude are also involved in marine aspects of civil infrastructure works, including the engineering of vessels to construct jetties, bridges and harbours.

Longitude provides the following marine civil engineering and support services to the infrastructure of projects:

  • Derivation of metocean conditions along the route
  • Voyage simulation analysis
  • Derivation of model design criteria
  • Stability, motions and strength analysis for transportation
  • Module fatigue analysis
  • In-place analysis of structures
  • Loadout and discharge engineering
  • Heavy lift analysis
  • Preparation of transportation procedures
  • Risk Assessment and HAZID

It has become common practice for large onshore construction projects to be built in a modular format at construction yards and then shipped to the project site, rather than stick-built in-situ.
Modules typically include pre-assembled units (PAUs) and pre-assembled racks (PARs) which can range in size from 10 to 2,000 tonnes, with some modules weighing up to 5,000 tonnes – and in some cases, more.

Since the beginning of modularization, Longitude has provided major construction and infrastructure companies with early-stage design engineering for module design, and with naval architectural support – throughout a project’s execution.

Typical scopes-of-work start with the derivation of module design criteria for transportation. This requires an assessment of weather conditions for the proposed shipping route. Longitude has access to wave model data, enabling us to provide metocean analysis for any worldwide location, as well as access to voyage simulation analysis. Motions analysis is then undertaken using a range of vessel types that may be suitable for the voyage to derive realistic design criteria. Later in the project, Longitude will assist the client with vessel selection, to ensure that the contracted vessels are capable to safely load, transport and offload the modules.

Other aspects of the project may require fatigue analysis of the module itself; grillage and sea-fastening design and analysis; specification of NDT requirements; load in and out engineering; stability and ballasting assessments; and alongside-mooring design and analysis. Load-in and load-out of the modules may be by lift or roll-on roll-off, using self-propelled multi-axle trailers (SPMT).

Longitude combines the qualities of a marine engineering consultancy with comprehensive design and planning solutions for infrastructure projects with marine components.
Would your organisation benefit from Longitude’s expertise in infrastructure-related marine support services? Contact our team today to discuss your project.