Silo Inspection Technology

Regular inspection of silos is essential for detecting potential problems before they lead to downtime or dangerous situations. Deposits, corrosion, cracks and structural weaknesses can develop over time without visible signs from the outside. Without inspection, deposits can grow until they completely block material flow, resulting in emergency shutdowns. In the worst case, structural weaknesses can lead to silo collapse – a catastrophic event with potentially fatal consequences. Many insurance companies and authorities require documented inspection of storage silos at regular intervals. Lack of documentation can affect insurance coverage and result in regulatory sanctions.

Traditionally, silo inspection has required inspectors to enter the silo with safety equipment and lighting. This method is time-consuming, dangerous and requires the silo to be completely emptied before inspection can be carried out. Visual inspection through inspection hatches provides limited overview and covers only a small part of the silo internal surface. Important problems in central areas or on the opposite side can easily be missed. Thickness measurement with ultrasound requires physical contact with the silo wall, which again requires entry or scaffolding construction. The process is slow and provides only point measurements that may not represent the general condition.

Inspection drones have revolutionised silo inspection. Compact drones equipped with high-resolution cameras and LED lighting can fly into the silo through existing hatches and document the entire internal surface. Drones can be equipped with zoom cameras for detail inspection, thermal cameras to detect moisture and temperature variations, and 3D scanners to map deposit thickness and distribution. The advantage is obvious: no one needs to enter the silo, inspection can be carried out faster, and the digital documentation is objective and can be stored for future reference and trend analysis.

Permanent sensor systems can provide continuous monitoring of silo condition without the need for periodic inspections. Load cells measure total weight and can indicate accumulation of deposits when weight deviates from expected content. Level sensors – radar, ultrasound or guided wave – can map the material profile and reveal asymmetries that indicate wall deposits or rathole formation. Temperature and humidity sensors can alert to conditions that promote hardening or microbial activity. Vibration monitoring of the silo structure can detect changes in resonance frequencies that indicate corrosion, fatigue or other structural weaknesses.

The most advanced approach combines periodic drone inspection with continuous sensor monitoring in an integrated condition-based maintenance programme. Data from both sources is analysed to optimise maintenance intervals and plan cleaning based on actual need instead of fixed time intervals. This data-driven approach can significantly reduce maintenance costs by avoiding unnecessary cleaning while minimising the risk of unplanned downtime.

Blue Power combines inspection expertise with cleaning services. We can carry out a visual inspection of your silo, document the condition, and immediately perform necessary cleaning – all in one operation that minimises downtime. Our experience with hundreds of silos across different industries gives us unique insight into what causes problems and how they are best resolved. Contact us to arrange an inspection and condition assessment of your silo facility.