Boiler Tube Inspection with Robots: A Practical Guide
PetroBot Technologies ·
Boiler tube failures are the leading cause of forced outages in thermal plants, and the tubes most likely to fail are often the hardest to inspect: second-pass areas, tight bundles and high sections that manual NDT reaches slowly or not at all. Ultra-compact inspection robots change what is practically inspectable during a planned outage.
Why boiler tubes go uninspected
Access is the constraint. Reaching second-pass tubes manually means scaffolding inside the boiler, confined-space entry, and inspector time spent climbing rather than measuring. Under outage time pressure, coverage gets cut to the areas that are easy to reach — which are not necessarily the areas that fail.
What a tube inspection robot does
An ultra-compact crawler like PetroBot's MicroRover travels the tube banks and second-pass areas directly, capturing HD visual records of fireside surfaces and taking UT spot thickness readings at programmed locations. Findings are position-referenced, so the same locations can be re-measured at the next outage and wall-loss rates trended over time.
- Access to second-pass and tight-clearance areas without scaffolding
- HD visual inspection of fireside corrosion, erosion and deposit patterns
- UT spot readings at repeatable, logged positions
- Faster coverage per outage hour than manual access methods
Planning a robotic tube inspection
Before deployment, the inspection provider needs boiler drawings, tube geometry and clearances, access opening locations, and the failure history that should steer coverage priorities. Robotic tube inspection slots into a normal planned outage — the value case is denser data from the same outage window, focused on the tubes whose condition actually drives reliability.