Why brownfield engineering is so risky
In complex process environments such as heavy industry, energy, chemicals, food and pharmaceuticals, a project’s returns come under pressure the moment an installation stays out of service too long. That is why modifications are planned as much as possible during short shutdowns or even while production continues. The result is that teams design based on old documentation and assumptions about the actual situation. This is exactly where most rework costs arise.
That documentation is often outdated or incomplete, because installations have been adjusted, expanded and updated over the years without every change being consistently recorded. Research in construction and industry shows that rework absorbs an average of 5 to 15 percent of total project costs. The main causes of these rework costs are:
- Geometric uncertainty: pipe diameters, flange positions and tolerances of existing steel structures deviate from the drawings, so new components do not fit on site.
- Hidden clashes: cable trays, air ducts and emergency routes unexpectedly collide with new pipes, skids or platforms.
- Limited time for measurement: manual measuring with tape and total station requires repeated physical access, safe zone release and work at height or in confined spaces.
What 3D laser scanning delivers
With 3D laser scanning, a scanner emits millions of laser pulses and converts the return time into a dense field of points, known as a point cloud. By setting up the scanner in different positions and merging the scans, a virtually complete digital copy of your plant is created. At industrial working distances, modern scanners achieve an accuracy of 1 to 6 millimetres. That is more than sufficient for piping, steel structures and civil modifications.
Working directly in the point cloud, instead of modelling first
The traditional approach was to convert the point cloud into a complete as-built model, in which piping, flanges, pumps and steel profiles are reconstructed as recognisable objects in a CAD or BIM platform. That is possible, but the modelling step costs time and money. For many projects that level of detail is simply not needed.
In 2026 we therefore often choose to work directly in the point cloud as a digital background. Our engineers design the new installation straight against the scanned reality, without the detour of a full CAD model of the existing situation. That significantly reduces lead time and cost, while accuracy remains identical: after all, you are designing against the same millimetre-precision data. Only where the project genuinely requires it, for example for clash detection with complex new construction or for coupling to a digital twin, is (part of) the point cloud modelled after all.
How you prevent costly surprises and rework
The biggest advantage of this method is the direct reduction of rework costs. Because our engineers continuously check their design against the point cloud, conflicts with the existing situation become visible during the design phase. A support at the wrong height, a pipe that runs differently than expected, a beam that is just in the way: you see it in the model, not on the plant floor during the shutdown.
The impact on rework costs is substantial. Where rework in projects without scanning averages around 12 percent of the project value, structural use of scans brings that down to 5 to 7 percent. On a 20 million euro project, that means a direct saving of roughly 1.2 million euros. Moreover, a conflict resolved during design or prefabrication is many times cheaper than the same conflict on the plant floor during a shutdown, where every hour worked translates directly into downtime cost.
Because piping and steel structures are fitted precisely against the scanned reality, you can prefabricate components with confidence that they will fit on installation. This avoids ad-hoc welding, temporary structures and dismantling of newly installed components. In an operating plant, exactly these kinds of interventions cause the highest rework costs and the greatest disruption to production.
Safety and continuity during modifications
3D laser scanning is based on remote measurement. The scanner stands in a safe location and captures the surroundings without physical contact. Your surveying staff have to work less often close to hot surfaces, high-pressure piping or explosion-risk zones. In most cases, scanning can be carried out while the installation remains in operation, keeping production losses to a minimum.
During major shutdowns, accurate knowledge of the actual condition is essential. With an up-to-date point cloud, you prepare in advance the access routes for cranes, space for prefabrication, cutting positions for flanges and scaffold designs. Every day of downtime avoided represents a substantial saving, and every properly prepared work sequence prevents rework afterwards. Because escape routes, emergency doors and fire-fighting equipment are correctly captured in the scan, you design new installations without compromising these provisions. That matters for, among other things, ATEX compliance in zones with explosion risk.
From point cloud to BIM or digital twin, when the project calls for it
For projects where a fully object-oriented model does add value, for example for long-term asset management, coupling to a digital twin or complex multidisciplinary coordination, we translate the point cloud into BIM after all. An important choice here is the right level of detail. Not every point needs to become a modelled element, since unnecessary detail leads to higher costs and heavier files. We determine in advance which parts are worked out to which level, aligned with your project goal.
Once an accurate as-built model is available, it can be linked to a digital twin in which dimensions, process data, planning and finance come together. This allows you to simulate layout variants, material flows and the application of sustainable technologies before anything is built. It is important to note: this is not a technology that works at the push of a button. Registration, quality control and interpretation by experienced specialists are crucial, especially with reflective surfaces and older plants.
Control from concept to delivery
For technical managers, plant managers and installation owners who lack the time, overview or specialist knowledge, a digital representation of the plant is a powerful tool for structurally reducing rework costs. You see objectively where the bottlenecks are and which routes carry the least risk. As your technical partner, we combine 3D scanning, design, calculations, project control and shutdown support from a single point of contact, with capacity from the Netherlands, Belgium and Chennai.
Anyone who wants to carry out modifications in operating plants without costly surprises can no longer rely on outdated drawings and isolated spot checks. The combination of practical engineers, multidisciplinary project management and reliable digital information ensures less delay, significantly lower rework costs and more control over schedule, cost, risk and continuity, while your production keeps running as much as possible.
