Jason De Silveira discusses robotic inspection inside confined spaces
The inspection of confined spaces has historically been one of contention within the industry. Dangerous for those who carry it out, expensive and necessitating long periods of downtime, moving from a human model to a robotic solution is seen as a welcome transition for asset owners, inspection service provider and insurance companies alike.
Advantages of robotic inspection
The most obvious advantage is that of human safety. The act of entering a confined space is a high-risk action. Assets that contain (or have contained) hazardous substances present further challenges, and the nature of confined spaces makes inspection complex and challenging.
Removing human entry to such spaces brings about the following benefits: lowered risk of injury and fatality; related lowering of insurance costs, typically by up to 50%; dramatically reduced downtime, as robots can enter non-oxygen atmospheres and the need for erecting safety devices for human entry is removed; increased productivity; and highly repeatable and constant data leading to more reliable inspection results.
As robotics have advanced so has their use for inspection, with many major companies introducing strategies to reduce or remove the need for humans to enter confined spaces. For instance, Dow Chemical is driving for a 2025 target of no human entry to confined spaces. And Chevron’s strategy aims to achieve this by the end of this year (2020). Statoil, Shell, BASF and BP also have similar targets.
What does moving to robotic inspection mean for service providers?
In virtually all cases, asset inspection and non-destructive testing (NDT) is carried out by third-party external providers. These highly skilled tasks are carried out by trained, certified personnel and the act of robotic inspection requires a very different approach to that of the traditional hand-on methods.
Specific training is necessary, as carrying out a maintenance and inspection via a robot has very distinct differences. Robots don’t have human intuition: at present robots don’t have the autonomous ability to make decisions based on experience or the ability to determine danger. Robots can’t plan their own inspection path: this needs to be mapped and determined by the human operator. Control is either manually or via a predefined automated program: both options require the inspection plan to be mapped out in intricate detail and programmed into the robotic unit.
Trained operators undertake mandatory training that includes inspection planning, path finding, remote navigation, deployment and retrieval of the unit.
Robotic inspection planning software
The aim of robotic inspection is to be as close as possible to having a human in situ within the confined space. The use of state-of-the-art software allows operators to carry out fast, in-depth inspections of high quality that are highly repeatable.
In addition, such software also provides a safe and educational learning curve. Operators are able to master multiple training scenarios through simulated inspection experiences, working on authentic predefined modules created from accurate 3D mapping. The ability to carry out real-life virtual scenarios ensures high-level learning and a smooth transition into real-world locations.
Oil case study
Leading equipment provider Nexxis is committed to providing its clients with the equipment necessary to carry out the ultimate in inspection tasks and to meet current and future targets. The company is currently working closely with one of the major oil companies to introduce its inspection planning software to optimise its future turnarounds and mitigate downtime.
The intuitive software helps all parties, from the operator, service providers and equipment suppliers, to have a clear understanding and goal on how to implement the robotic inspection with the correct methodology. It also assists with future planning by capturing valuable data sets that will save the operator time and money.
Jason De Silveira is director of Nexxis