Buyer’s Guide for Mini ROVs
Whether you’re working in Aquaculture, Marine Renewables, in-shore construction or some other underwater-related activity, purchasing an ROV can represent a significant investment and getting it wrong can have long-term implications. At Dockstr, we have an experienced team that not only understands the technical and operational aspects of such a purchase but has an in-depth knowledge of the market for both new and used equipment in this area. Such a unique combination can be a valuable addition to your decision-making process.
Mini-ROV - the basics
A mini remotely operated vehicle (“mini-ROV”), or underwater drone, is a small, manoeuvrable underwater vehicle operated by remote control. The miniROV is tethered to a surface control unit by a cable that provides power, control signals, and a video feed from cameras mounted on the vehicle.
MiniROVs are typically smaller more affordable and highly portable compared to larger ROVs, making them a popular choice for a variety of applications in protected or benign underwater environments.
These are some of the typical features of a miniROV:
MiniROVs typically are less than a meter in size;
They tend to weigh less than 100kg and most can typically be handled manually;
MiniROVs are typically limited to operating in shallow water, at depths ranging from a few meters to around 200 metres water depth;
MiniROVs are equipped with cameras, lights and sonars in addtion to being able to handle a variety of small sensors.
Some miniROVs are equipped with small manipulators or grippers which are robotic arms that allow a limited interaction/intervention capability such as grabbing objects or performing other basic tasks such as rope cutting .
Designed to be deployed by a single operator, mini ROVs allow for streamlined and low-cost underwater missions. They typically come as full packages comprising ROV, operator controls and interconnecting tether although some can be expanded to include more complex arrangements such as tether storage reels.
With prices for new mini-ROVs ranging from $4,000 to $50,000, these compact systems provide a cost-effective options for shallow underwater operations in relatively benign environments.
Capacity and Capabilities
Due to their compact size and maneuverability, mini ROVs can support a multitude of shallow water applications. Common industrial and commercial applications include:
Inspection of underwater structures, such as pipelines, piers, and ship hulls
Search and recovery operations
Underwater photography and videography
Scientific research
Mini ROVs also serve the recreational market, allowing enthusiasts to explore underwater landscapes, capture footage, and conduct research in a user-friendly manner.
Important considerations when buying
Choosing the right mini remotely operated vehicle for your specific requirements is important to ensure efficient and successful operations. In this guide, we present some of the key aspects to consider when selecting a mini-ROV, enabling you to make an informed decision that aligns with your unique needs and applications.
Application:
Given the wide range of possible applications for a mini-ROV, particular consideration should be given to the type of work to be undertaken as this will greatly impact your decision-making. For example, performing high-quality video surveying may require a different approach or specification of equipment than if you are carrying sensors or performing basic intervention.
Payload Capacity:
Mini-ROVs have a very limited payload capacity compared to larger systems however it is still essential to consider the equipment and payloads that may be used during the ownership and operation of your ROV.
Manoeuvrability:
Manoeuvrability can be an important consideration when buying a Mini-ROV. This is because the operating environment where you'll be using such ROVs can be extremely difficult due to high water currents, visibility, and confined spaces, all which influence the manoeuvrability required.
Technological Features:
Evaluating the technological features and capabilities of various mini-ROVs is an important consideration. Factors such as camera quality, available lighting, sensor integration, and data transmission capabilities may vary significantly between models and manufacturers.
Depth Rating:
Mini-ROVs tend to be limited to operating in a few hundred meter of water only therefore this is less important than for larger classes of ROVs where operating depth becomes a major consideration.
Power, Size and Portability:
Consideration of the power required by a mini-ROV is important given the portability of these systems; you want to be able to easily power your ROV in most operating locations you are likely to encounter including having the ability to operate with portable power supplies or generators. Mini-ROVs are very easy to transport and deploy even in remote locations however issues such as manual handling and deployment solution must be thought-out well in advance.
“Mini-ROVs can be considered basic compared to larger systems however they require the same attention-to-detail when making a purchase in order to avoid being stuck with the wrong equipment”
Mini-ROV Manufacturers and Models
Product differentiation in the mini-ROV market hinges on several key factors. Water depth rating, weight-to-thrust ratio, sonar capabilities, and software sophistication are critical considerations for prospective buyers. Robotics and AI are rapidly evolving technologies, so there is a steady stream of innovations as manufacturers strive for enhanced miniROV performance and functionality.
In addition to the core miniROV platform, a range of accessories add further augmentation. Upgrades such as increased payload capacity, advanced sonar systems for enhanced navigation and mapping, and software enhancements for improved control and data analysis contribute to versatility and utility.
In the highly competitive market for miniROVs, numerous manufacturers vie for market share. Among the leading players are industry stalwarts such as VideoRay, Blue Robotics, Chasing, Deep Trekker, JM Robotics, Outland, and ECA. Each manufacturer brings its unique strengths and innovations to the table, contributing to the diversity and advancement of miniROV technology.
An interesting system in the entry-level category is the BlueROV2 from Blue Robotics, a popular underwater drone known for its affordability and high performance. This is a powerful underwater drone that is well-suited for a variety of applications, including underwater inspection, research, and also in education. It has a six-thruster vectored configuration, allowing for smooth, stable, and highly manoeuvrable movement. This makes it ideal for navigating tight spaces and capturing clear video footage. The ROV comes partially assembled and utilises open-source software, making it attractive to those who want some customisation options.
One of the key capabilities of the BlueROV2 is its ability to capture live 1080p HD video. This feeds directly to a computer or tablet, providing a real-time view of what the ROV is seeing underwater. The ROV is built with a rugged frame and is depth-rated for standard operation in shallow to moderate waters. It also has quick-swappable batteries, which helps to extend your exploration time.
The BlueROV2 is also expandable - the system is designed to allow for future upgrades, such as additional thrusters or a heavy configuration kit for increased stability. This makes it a good choice for those who may want to expand the ROV's capabilities in the future
A little further along the spectrum, the VideoRay Pro-5 Mini ROV is a small underwater robot designed for efficiency and performance in tight spaces. Despite its compact size (weighing in at just 22 pounds), it packs a punch with a three-thruster system that allows it to zip through the water at over 4.4 knots. This maneuverability is ideal for situations where precise control is needed, like inspecting infrastructure or conducting search and recovery missions.
The Pro-5 also boasts an impressive depth rating of up to 1,000 meters, making it suitable for exploring a wide range of underwater environments. Furthermore, its modular design allows users to customize the ROV with different tools and payloads to suit their specific needs. This versatility makes the Pro-5 a valuable asset for various applications, from science and research to offshore oil and gas exploration.
As the market for miniROVs continues to evolve, manufacturers and users alike can expect ongoing innovation and refinement in both core systems and accompanying accessories.
What can we do for you?
Remotely operated vehicles can be extremely complicated systems that require comprehensive evaluation before purchase, particularly when it comes to used equipment. Technical, operational, financial and strategic considerations mean that the right level of understanding is required to support an acquisition (or indeed rental).
At Dockstr, our strong commercial and technical backgrounds have helped many customers make the right decision by supporting their equipment-related needs in the area of remote intervention. Therefore, if you are thinking of investing or divesting in this specialised area of subsea engineering, we can offer support at various levels to achieve the right outcome for your business.
