Topside Delivery: Managing Scale, Complexity and Execution in Modern Offshore Projects

By Daniel Sherwood, Director of Projects, Sanjeev Jindal, Director of Engineering and Tomi Dania, Sr. Director of Operations

Topside facilities sit at the center of offshore production. They house the equipment that separates, treats and prepares hydrocarbons for export, often within a confined footprint and in demanding conditions.

The way these facilities are designed and delivered has changed considerably in recent years. This is being driven by increasing scale, tighter schedules, emissions regulations and digitalization.

Scale and complexity growing

KBR has been involved in topside engineering for more than 50 years, supporting offshore developments across multiple regions and project types. That experience spans early concept studies through to detailed design and construction support, covering Floating Production, Storage, and Offloading (FPSO) systems and fixed process/wellhead platforms as well as semi-submersible platforms, Floating Storage and Regasification (FSRU), Floating LNG (FLNG) and Floating Ammonia (FAPSO) facilities.

Over this time, we've seen the scale of topside facilities grow significantly. In recent years, KBR has supported some of the largest deepwater, high-capacity FPSOs currently being developed. This includes the prolific pre-salt developments of Brazil, delivering five topside designs over the last five years.

The move towards larger topsides is largely driven by economies of scale. A single larger installation can reduce overall capital and operating costs compared with building and running two smaller facilities delivering the same output.

Alongside scale, complexity has also increased. On a recent deepwater Brazilian FPSO project that KBR supported, the topside comprised over 20 modules, each effectively forming a multi-level processing plant in its own right, containing equipment, piping, electrical systems and instrumentation.

Bringing these together created a highly congested environment, where layout and maintenance all needed to be carefully managed, particularly as operators applied lessons from earlier assets to shape how the facility was designed and run.

Fabrication geographies

This complexity extends well beyond the physical design. Fabrication is now distributed across multiple locations globally, with modules often built in parallel across yards in China, Brazil, Korea and Southeast Asia before final integration at a single site.

Each of these yards brings different capabilities. Some are better suited to smaller modules, while others can handle significantly higher tonnages, which becomes critical on high-capacity FPSO projects where individual modules can run into several thousand tons.

Integration is typically carried out at a central yard within this network. Singapore, for example, is an important hub for large-scale topside assembly, particularly where larger module weights and complex integration are involved.

From an engineering and project management perspective, this means a true global delivery taskforce, supporting multiple fabrication yards and workfronts at the same time, each working to its own schedule and information requirements. Deliverables are issued in parallel, often at different levels of maturity depending on what each yard needs to maintain progress.

On large projects, this can mean engineering teams are supporting fabrication across several locations simultaneously. Maintaining consistency across these workstreams, while continuing to develop the design, adds a layer of complexity that goes beyond traditional single-yard delivery models.

This is where coordination becomes critical. Design teams across KBR's global network work within a shared 3D model, bringing together engineering capability from multiple regions and specialist centers.

Managing that model becomes a major task in itself. Clash detection, where different systems compete for the same physical space, can involve thousands of conflicts that must be identified, tracked and resolved while the project moves forward.

Big platform, big data

Managing the data behind these facilities is now a significant part of the challenge. On large topside projects, multiple engineering teams across regions are working within a single, live 3D model, with thousands of components being updated in parallel.

Keeping that model consistent across different systems takes work. Even something small, like a pipe size being defined slightly differently in two tools, can cause problems later if it isn't picked up early.

To avoid that, teams are putting much more focus on data quality, with regular checks across systems deploying digitalization tools, tighter control over inputs and tools to help flag inconsistencies as they arise.

Fabrication yards are increasingly asking for engineering information earlier so they can keep work moving. That often means drawings are issued before the design is fully complete, including isometrics with known gaps that need to be filled in later.

Managing this risk comes down to keeping track of what's still open, staying closely aligned with the yards, and making sure updates are fed back into the model and engineering design without disrupting the build.

Topside sustainability

Alongside these execution challenges, the design brief itself is changing. Emissions reduction is now a standard requirement on many projects. Measures such as eliminating routine flaring and incorporating carbon capture are increasingly specified from the outset.

Power generation is one area where this is starting to change. Traditionally, offshore facilities have relied on simple-cycle gas turbines. On some recent projects, operators are looking towards combined cycle systems, where waste heat is captured and used to generate additional power. This means the same electricity can be produced using less gas, helping to reduce emissions and meet regulatory requirements.

Combined cycle systems are not new, but they have only been used on a limited number of offshore installations. Interest is growing, although there are trade-offs. These systems need additional equipment, including steam generators, which adds cost, footprint and weight.

Others are looking at electrification, moving power generation onshore and supplying offshore facilities via subsea HV cables. This can help reduce emissions and, in some cases, allow for smaller topsides, but it brings its own technical and commercial challenges.

Topside development is changing quickly, but engineering remains at the core. Delivering these projects now depends just as much on how well teams coordinate across locations, manage data and bring these requirements into the design from the outset.