Micro-ROV vs. diver: the 7 unbeatable advantages of underwater drones

Micro-ROVs offer a safe and efficient alternative to traditional diver operations and system pumping. They navigate in confined spacesThey stir up less sediment and are easy to disinfect, especially in the drinking water sector. Without complex pre-planning and safety concepts, micro-ROVs can quickly deliver high-resolution data - ideal for modern inspection requirements. In this article you will learn about the 7 key advantages why Micro-ROVs are increasingly replacing conventional methods.

Why micro-ROVs (underwater drones) make conventional inspections with divers superfluous in many areas

Traditional inspections of underwater infrastructure often rely on divers or pumping systems empty. While divers continue to be used for many complex tasks under water micro-ROVs offer an efficient alternative for inspections and the recovery of tools or foreign objects. These small, remote-controlled vehicles are able to perform many tasks that would otherwise require costly operations. In this article, we highlight the 7 most important reasons why micro-ROVs are increasingly replacing conventional methods.

1. no need to empty (or drain) the system

Traditional Inspection methods often require systems or containers to be pumped empty before inspections or repairs can be carried out. This process is not only time-consuming, but also leads to long operational interruptions and increased costs. Micro-ROVs eliminate the need for pumping empty, as they can operate directly in systems filled with liquid. This saves both labour time and resources. Especially in areas such as TanksMicro-ROVs offer an efficient solution for the inspection of reservoirs or pipelines, as they are able to carry out detailed surveys and inspections without the need to shut down operations or dispose of fluids.

2. no use of divers in hazardous environments

The use of divers in industrial environments often entails considerable risks. In confined or difficult to access spaces such as tanks or reservoirs, the use of divers can be dangerous. Extensive safety precautions must be taken here, such as the provision of additional personnel, emergency equipment and adherence to strict protocols. Micro-ROVs eliminate these risks by performing the same inspection tasks without putting people at risk. They can safely operate in confined spaces that are inaccessible or too risky for divers, while providing accurate data.

3. simpler and more thorough disinfection in the drinking water sector

Hygiene is of the utmost importance when inspecting drinking water systems. While submersible equipment needs to be extensively sanitised to prevent contamination, micro-ROVs are much easier and quicker to clean. They can be easily sanitised and prepared for use in drinking water tanks without the need for complex cleaning procedures. This makes them an ideal choice for inspections in sensitive areas where compliance with hygiene regulations is a top priority. In addition, the compact design of the micro-ROVs offers the advantage that they can manoeuvre in confined water reservoirs without jeopardising drinking water quality.

4. less sediment resuspension for clearer inspections

Conventional inspection methods such as using divers or pumping a system empty can easily result in a large amount of sediment being stirred up at the bottom of the tank or reservoir. These sediments impair visibility and make it difficult to carry out an accurate inspection. Micro-ROVs, on the other hand, create minimal turbulence when moving in the water, preventing sediment from being stirred up. This results in a clearer view of the areas to be inspected and makes it possible to capture detailed and meaningful data. Inspections are not hindered by turbid water, which enables a more accurate assessment of the condition of the system.

5. efficient navigation in zero visibility with sonar

In many industrial plants, there are areas where visibility is extremely limited or non-existent - be it due to cloudy water, dirt deposits or complete darkness. This is where micro-ROVs come into their own, as they are equipped with sophisticated sonar technology that enables them to navigate safely even in zero visibility. By using sonar, micro-ROVs can recognise obstacles, measure distances precisely and target the areas that need to be inspected. This makes them particularly suitable for inspections in extremely difficult environments where conventional methods are impractical.

6. fast and flexible deployment without complex planning

The deployment of divers or the pumping out of a facility often requires lengthy and complex preliminary planning, which, in addition to a thorough risk analysis, also requires the deployment of extensive personnel and equipment. Micro-ROVs, on the other hand, are flexible and can be deployed quickly. They can be deployed within a few hours as required, without the need for detailed planning or lengthy preparations. This not only saves time, but also makes it possible to react flexibly to short-term inspection requirements. As a result, operations are hardly disrupted and the inspection can be carried out quickly and efficiently.

7. high-resolution data and images for precise reports

Ein weiterer großer Vorteil von Micro-ROVs ist ihre Fähigkeit, hochauflösende Unterwasserbilder und -videos zu erfassen. Moderne ROVs sind mit fortschrittlichen Kameras ausgestattet, die selbst bei schlechten Lichtverhältnissen klare und detaillierte Aufnahmen liefern. Diese Aufnahmen sind von unschätzbarem Wert für die genaue Inspektion und Dokumentation von Schäden oder Verschleiß. Zusätzlich können viele Micro-ROVs mit weiteren Sensoren wie LiDAR to capture even more detailed data. This high-resolution data enables the condition of the system to be analysed precisely and provides well-founded information for maintenance or repair decisions without the need for physical intervention in the system.

Conclusion

The use of micro-ROVs offers a modern, efficient and safe alternative to conventional inspection methods such as pumping systems empty or using divers. They eliminate the need for lengthy preparations and extensive safety precautions, while being able to carry out precise inspections even under difficult conditions such as zero visibility or in confined spaces. Micro-ROVs enable detailed data collection without interrupting operations and can be used safely in drinking water areas. By reducing risk, cost and time, Micro-ROVs are revolutionising the way in which Underwater inspections in the industry. Companies that rely on this technology benefit from faster inspections, fewer operational interruptions and more precise data for their maintenance decisions.

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Frequently asked questions

What does an ROV inspection cost?

The costs of an ROV inspection are generally significantly lower than traditional diving operations. The exact costs depend on various factors:

Size and complexity of the system
Duration and scope of the inspection
Type of documentation required
Additional equipment required
Location and accessibility of the system

How deep can ROVs dive?

Professional micro-ROVs can easily reach depths of 100 to 300 metres. Special industrial ROVs can even dive to depths of up to 1,000 metres. Unlike divers, they work without decompression times and depth restrictions.

What advantages do ROVs have over divers?

The most important advantages of ROVs are

Significantly lower operating costs
Increased safety through remote-controlled operation
Longer operating times possible
Better documentation thanks to HD cameras
Immediate operational readiness
Access to confined and hazardous areas

How long does an ROV inspection take?

An average ROV inspection takes between 4 and 8 hours. Compared to diver operations, which often take several days, ROVs can work continuously and save up to 70% of inspection time.

Are ROV inspections suitable for drinking water tanks?

Yes, ROVs are ideal for drinking water tanks. They are easy to disinfect, leave no contamination and fulfil all hygiene requirements for drinking water systems. The devices are cleaned before each use in accordance with the strict drinking water guidelines.

How big is an ROV for industrial inspections?

Micro-ROVs for Industrial inspections are compact and manoeuvrable. The most common models measure approx:

Length: 40-60 cm
Width: 30-40 cm
Height: 25-35 cm

This enables access to confined spaces and complex structures.

Can an ROV work in poor visibility?

Yes, ROVs can work effectively even in poor visibility. They are equipped with:

Powerful LED headlights
Special sonar systems
Advanced filter technologies
Automatic image optimisation

Which industrial plants can be inspected with ROVs?

ROVs are suitable for inspecting a wide variety of systems:

Water reservoirs and tanks
Wastewater treatment plants and wastewater systems
Cooling water systems
Offshore facilities
Industrial pipework
Dams and hydropower plants