The ladder before the drone

A fixed camera, a pole camera, a crawler or a rope crew sometimes beats a drone. A drone dealer who says that out loud is more useful than one who does not.

Every inspection problem sits on a ladder of tools. At the bottom: walk over and look. Then a mirror on a pole, a camera on a pole, a fixed camera that watches all the time, a crawler that drives the pipe, a rope access technician, and somewhere up the ladder, an aircraft. The right answer is the lowest rung that actually reaches, because every rung above it adds cost, planning and failure modes.

A drone earns its rung in specific situations. When access is the dominant cost: the flare stack that otherwise needs a shutdown, the roof nobody should walk, the vessel interior behind a confined space permit. When coverage is large: hundreds of acres of panels, miles of corridor, a stockpile yard measured monthly. When the alternative is a person on a rope or a scaffold in a dangerous place.

And it loses its rung just as specifically. A single viewpoint that never changes is a fixed camera's job. A short lateral is often a push camera's job, and a long main with standing flow may still belong to a crawler that can stop, rotate and stare. Work requiring physical contact, thickness readings, coatings work, an actual repair, ends the flight discussion in most cases. If the deliverable is a measurement the sensor cannot take from the air, the aircraft is a courier for disappointment.

The reason we publish this ladder is commercial, not charitable. A buyer sold a drone for a pole camera problem becomes a story about how the technology does not work, told at conferences for years. A buyer pointed to the cheap pole first comes back when the real aerial problem shows up, and brings the budget that problem deserves.

So our concierge is instructed to ask the ladder question before naming aircraft, and to answer it honestly even when the honest answer is a cheaper tool we do not sell. On the inspections where a drone is right, it is usually right by a wide margin. There is no need to claim the rest.