Field note · 2025-11-12 · 6 min
A chimney does not miss by a little. It misses by a plant.
How a 135 m RCC stack at NTPC Kanti was hinged into a five-degree corridor, forty metres from a live ID fan.
Owners do not buy demolition. They buy a neighbouring unit that stays energised. At NTPC Kanti the 135 m chimney sat forty metres from an ID fan and a switchyard. A few degrees off the drawing and the station takes an outage nobody booked.
The method is a hinge, not a guess. We cut and charge one face, protect the opposite, and fire on electronic detonators so the shaft rotates onto a line measured in degrees. The corridor at Kanti was five degrees. The plant stayed live.
What the owner should ask, before anyone drills: what is the vibration ceiling, what is the nearest live asset, what is the fall azimuth, and who signs the delay sequence. If the answers are verbal, it is not a design.
EXIQUDE films the shot. Insurers, station authorities and the press stand on a marked line. The archive is the proof — not a brochure paragraph.
If you have a stack inside an operating station, send the drawing and the distance to the nearest running asset. Our team will tell you whether a hinge-cut is even legal in that envelope.