Against the backdrop of the ongoing "Dual Carbon" strategy, gas turbines and heavy-duty steam turbines—serving as core power equipment for thermal peak-shaving plants, distributed energy systems, and offshore energy platforms—operate continuously under conditions of high temperature, high pressure, and cyclic loading. Turbine blades feature dense internal micro-cooling channels with diameters typically under 1 mm; prolonged service makes them susceptible to defects such as internal wall corrosion, fouling and blockages, fatigue micro-cracks, and residual foreign matter. Once a cooling channel becomes blocked, the blade's heat dissipation capacity diminishes, making it highly prone to thermal deformation and burnout; this can trigger unplanned unit shutdowns and result in economic losses amounting to tens of millions of yuan. Consequently, achieving efficient, non-destructive testing of these micro-cooling channels has become a key priority for major power generation groups and heavy equipment manufacturers.
Energy companies have historically faced multiple challenges regarding maintenance and inspection. Short unit downtime windows preclude extensive blade disassembly for inspections; conventional endoscope probes are too thick to enter sub-millimeter cooling micro-holes; and traditional fiber-optic endoscopes lack the image clarity needed to detect tiny cracks or subtle fouling. Consequently, many enterprises rely on periodic disassembly and sampling—a process that is time-consuming, labor-intensive, and carries the risk of missed defects. Imported ultra-fine endoscopes are expensive and involve lead times of several months for spare parts, making them ill-suited for the routine maintenance needs of domestic energy equipment.
As a leading domestic manufacturer of industrial endoscopes, VSNDT has leveraged mature 0.75mm ultra-fine endoscopy technology—originally developed for the aerospace sector—to serve the energy and power equipment market. Thanks to their reliable performance, these 0.75mm ultra-fine industrial endoscopes are widely used for both factory acceptance testing and in-service inspections of cooling channels in heavy-duty gas turbine and industrial steam turbine blades, securing a leading market share in the sector of micro-hole inspection for energy equipment blades.
The 0.75mm ultra-fine probe is perfectly suited for 0.8mm-class cooling micro-holes; its flexible, bend-resistant cable allows it to navigate through curved and bifurcated cooling channels. The cable features a wear-resistant, high-temperature coating, enabling inspections to be performed while residual heat remains after shutdown, thereby reducing maintenance downtime. The miniature front-end optical system offers adjustable brightness levels and intelligently optimizes images to handle dark fouling or reflective areas on metal inner walls, allowing for the precise detection of minute defects as small as 5 microns. An electric articulation function enables the probe to penetrate angled branch channels and thoroughly inspect all inner wall surfaces, ensuring complete coverage with no blind spots.
The equipment covers the entire workflow across the upstream and downstream sectors: gas turbine component manufacturers use it for comprehensive pre-shipment blade inspections to screen out casting residues, machining burrs, and internal passage defects; power plant O&M teams utilize it for in-situ borescope inspections during major overhauls and emergency repairs—eliminating the need for blade disassembly and significantly shortening maintenance downtime; and third-party NDT agencies leverage lightweight, handheld models to flexibly travel to various power plants for on-site inspections. The entire system features an IP67 rating—offering resistance to oil, moisture, and dust—making it well-suited for the complex industrial environments of energy facilities while ensuring exceptional stability during long-term, continuous operation.
In terms of total cost, the procurement and maintenance expenses for VSNDT' domestically produced ultra-fine endoscopes are far lower than those of imported alternatives. A nationwide technical team ensures rapid response, providing integrated services that include customizable probe lengths, optimization for specific operating conditions, and hands-on operator training. In recent years, an increasing number of energy equipment manufacturers and major power plants have transitioned to domestic inspection equipment.
As the domestic drive for independent development of heavy-duty gas turbines accelerates, demand for high-end non-destructive testing (NDT) equipment keeps rising. VSNDT has long focused on visual inspection applications within the energy and power sector, continuously optimizing the durability of ultra-slim probes and imaging algorithms. Our 0.75 mm ultra-fine industrial video endoscope overcomes bottlenecks in micro-hole inspection. It enables energy enterprises to detect potential faults on turbine blades at an early stage and conduct timely remediation, lowering risks of unplanned shutdowns, improving the operational stability of energy equipment, and supporting the high-quality and secure development of China’s energy industry.
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