Crack identification Drone Guide

Oil and gas facilities contain extensive infrastructure that is continuously exposed to demanding operating and environmental conditions. Storage tanks, pipelines, processing equipment, flare structures, offshore platforms, pipe racks, chimneys, concrete structures and supporting steelwork can experience ageing, corrosion, thermal cycling, vibration, weather exposure and mechanical stresses. Cracks can be one visible indication that an asset requires closer professional investigation. Identifying these conditions can be challenging because many critical assets are elevated, difficult to access or located in hazardous environments. Traditional inspection may require scaffolding, rope access, elevated platforms or shutdowns simply to allow inspectors to reach an area. Drones provide another method of collecting detailed visual information. High-resolution cameras, optical zoom, thermal sensors, LiDAR and specialised imaging payloads can allow suitably equipped drones to inspect accessible external surfaces from appropriate stand-off distances. Artificial intelligence can also assist inspectors by screening large image datasets for visual patterns that may warrant human review. Drones do not determine the structural significance of a crack. Instead, they can help inspection teams **find, document, locate and monitor visible indications so that qualified professionals can determine what further investigation is required.** ## **Where Can Cracks Occur?** Oil and gas infrastructure contains many different materials and structures. Visible cracking or crack-like indications may occur around: - Storage tanks - Concrete foundations - Pipe supports - Offshore structures - Chimneys and stacks - Flare-support structures - Buildings - Retaining structures - Jetties - Loading infrastructure - Protective coatings - Structural steel - Process-support structures Different materials require different inspection and diagnostic techniques. Drone imagery should therefore form part of a broader asset-integrity programme. ## **High-Resolution Visual Inspection** High-resolution RGB photography is the primary drone technology for visible crack identification. A suitable camera can collect detailed images of an asset from multiple angles. Inspectors can subsequently zoom into photographs and examine areas requiring attention. Unlike a ground observer looking at an elevated structure through binoculars, drone imagery creates a permanent digital record. The same location can then be compared during future inspections. ## **Optical Zoom Cameras** Optical zoom is particularly valuable in oil and gas environments. Rather than positioning the aircraft unnecessarily close to infrastructure, zoom cameras can collect detailed imagery from greater stand-off distances where conditions permit. This is useful for tall structures, elevated pipe racks, tanks and other difficult-to-access areas. Image quality, distance, lighting and viewing angle all influence whether small surface features can be reliably observed. ## **Storage Tank Crack Inspections** Large storage tanks require regular integrity-management programmes. Drones can inspect accessible external tank walls, roofs, supporting structures and surrounding infrastructure. High-resolution imagery can document visible surface conditions requiring further investigation. Images can be associated with particular locations on the tank. Future surveys can then return to the same areas to document visible changes. However, drone photography cannot establish the depth of a crack or determine the remaining strength of the material. ## **Tank Roof Inspections** Tank roofs can be difficult to inspect because they may require personnel to work at height. Drones provide an aerial perspective of suitable external roof surfaces. Detailed photographs can document visible deterioration, corrosion, coating damage, deformation or potential cracking. Areas of concern can then be prioritised for appropriate hands-on inspection. ## **Pipeline Crack Identification** External pipeline surfaces may contain visible deterioration or damage. Where the pipe is above ground and visually accessible, drones can collect detailed imagery. Pipeline supports, crossings and surrounding structures can also be inspected. However, many important pipeline cracks are microscopic, internal, subsurface or otherwise impossible to detect using conventional aerial photography. Specialist pipeline inspection technologies remain essential. ## **Pipe Rack Inspections** Refineries and processing plants can contain kilometres of elevated pipe racks. These structures can be difficult to inspect comprehensively from ground level. Drone cameras can document accessible supporting steelwork, structures and visible external pipe surfaces. Images can be organised according to asset location. This helps integrity teams determine where closer access may be justified. ## **Offshore Platform Inspections** Offshore platforms contain complex steel structures exposed to saltwater, wind, waves, vibration and industrial operating conditions. Drones can support visual inspection of suitable external areas including elevated structures, decks, flare-support structures and other difficult-to-access components. The ability to position a camera near elevated infrastructure can reduce some requirements for rope-access visual surveys. Marine weather and confined operating areas create additional challenges requiring experienced operators. ## **Splash Zone Assessment** The splash zone of offshore structures experiences repeated wetting and drying and can be a demanding environment for materials. Drones may document accessible above-water or near-surface external conditions where flight operations are appropriate. High-resolution imagery can help integrity teams identify visible areas requiring specialist assessment. Submerged structures normally require other technologies such as remotely operated vehicles. ## **Flare Structure Inspections** Flare-support structures can be extremely tall. Drones can provide detailed imagery of accessible structural components without requiring personnel to climb the entire structure for every preliminary inspection. Optical zoom can provide observations from appropriate distances. Operating around active flare systems requires specialised risk assessment because of heat, turbulence, gases and other hazards. ## **Chimneys and Stacks** Industrial stacks can contain concrete, masonry, steel and other materials. Cracking, surface deterioration and corrosion may develop over time. Drones can capture detailed imagery across the external structure. Photogrammetry can also create a three-dimensional model that allows observations to be associated with specific locations. ## **Concrete Crack Identification** Oil and gas facilities contain extensive concrete infrastructure. Foundations, bunds, retaining walls, buildings and structural supports can develop visible cracking. Drone photography can document these areas, particularly where they are elevated or extensive. The imagery can help inspectors map crack locations. Structural engineers must determine whether the observed cracking is superficial or potentially significant. ## **Corrosion and Cracking** Corrosion and cracking can sometimes occur in the same general areas. Drone imagery can therefore be used to document multiple visible surface conditions during a single inspection. High-resolution photographs can identify corrosion staining, coating deterioration and visible cracking. This provides asset-integrity teams with a broader picture of external surface condition. ## **Coating Inspections** Protective coatings help shield oil and gas infrastructure from environmental exposure. Coating deterioration can leave underlying materials more exposed. Drone imagery can document peeling, blistering, discolouration and other visible coating conditions. Areas requiring closer inspection can then be identified before maintenance teams