Conceptual Design


Soils and rocks are not homogeneous; layers can exhibit significant lateral and vertical strength variability, the presence of cobbles and boulders can vary widely and preferentially cemented or indurated layers in soils and rocks deviate markedly from the characteristic geotechnical behaviour of soil or rock.

At  conceptual design stage, site data is often limited and project planning is fluid which, when combined with the geological and geotechnical challenges, presents a demanding scenario.

Our team has delivered early-stage design of subsea infrastructure worldwide – from under-consolidated clay in 3 km water depth to exposed rock on the continental shelf, and everywhere in between. All forms of infrastructure are considered including pipelines, foundations and subsea cables and, importantly, Cathie are completely technology agnostic.

These studies are structured to identify the most promising concepts from a CAPEX and installation perspective, but also from an OPEX perspective, whilst managing and mitigating risks. Dialogue with our clients, preferably in a workshop setting, is critical in shaping and mapping the various permutations needed to fully inform the design process.

Critical to the delivery of these early stage designs are the effective delivery of an integrated, spatial approach to understand how various concepts will interact and perform in the subsea environment; we pride ourselves on working in a holistic manner with a cross-discipline ‘one-team’ ethos.

Our unique approach to conceptual design allows our clients to navigate key, early stage decision gates with confidence.

At Cathie, we deliver site suitability, desk study, geohazard assessment, concept design and risk management as part of feasibility studies. Our services are designed to set a project on the right path, manage risk cost-effectively and enable key strategic decisions.