A customer contacted us after an earth quake rattled their plant. We mobilized rather quickly and did an inspection on their 350' concrete stack, elevator, platforms and avation warning lights. We discovered they had damage to the interior brick stack and one of the metal bands had fallen off and was laying inside the annulus space (space between inner stack and windscreen). Although we recommended reapir of the brick work that was damaged they only had immeiate funding to replace the band as other more critical equiment had been damaged as well.
Since the annulus space was far too small for any motorized lifting equipment the couple hundred pound steel band had to be manually hoisted into place. Just like ancient times, it's amazing what several thousand feet of rope and pully systems can do. A rigging system was created allowing only two people to easily hoist the entire band into position, 180' in the air so that other technicians could repel down to it from the top of the stack and install the metal band, thus resuppirting the brick chimney.
All equipment including the 20 foot sections of band and workers had to be manuvuered through these small spaces.
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