Marsden A & B Chimney

Marsden A & B Chimney

On October 20, 1997, Controlled Demolition, Inc. (CDI) and its international affiliate, C.D.I. (U.K.), Ltd. performed what local authorities called the first implosion project conducted in New Zealand. Two (2), 395 ft.-tall (120 m), reinforced concrete windscreens with internal steel flues were felled in a back-to-back demolition sequence at the Electricity Commission of New Zealand (ECNZ) Facility in Ruakaka.

Working as a specialty subcontractor to McConnell Smith, Ltd., CDI first visited the site in early 1997, to introduce CDI’s implosion capabilities to the Property Owner and New Zealand regulatory agencies. CDI’s representatives arrived in Ruakaka ten (10) days prior to the scheduled implosion to lay out and observe specialty preparations performed by local New Zealand crews to CDI’s specifications.

Independent seismic monitoring was set up to record vibration at the request of ECNZ (who had operational power facilities immediately adjacent to the demolition site), NZ Refining Company, Ltd. (who had an adjacent oil refinery and pipelines passing the fall zone of the stacks), TransPower, Ltd. (who were responsible for transmission of ECNZ Power throughout northern New Zealand), and National Gas Corporation, Ltd. (whose main gas lines servicing the North ran in close proximity to the "fall zone" for the chimneys).

One (1) windscreen was to be felled in a fairly open, 30 degree wide fall area, however, the second had to be laid in a 10 degree fall area between distilled water tanks providing cooling water for the power generating operations on site and a telecommunications shed which linked communications in the industrial complex.

CDI felled both structures on target, completed operations on schedule, and to the complete satisfaction of all parties involved.

"May I first thank CDI in helping our group complete a difficult contract. The professional approach your team adopted to the task, and the help you personally gave me during some rather tense meetings contributed greatly to a successful contract. I have been in contact with the NZ Refining Company Limited, TransPower Limited, National Gas Corporation Limited and some of the local residents and local business operations. We have not received one complaint from a business or a local resident which in itself speaks volumes. Both myself and key members of the team would welcome the opportunity to work with you on future projects."

Mr. Fred Crozier, Project Manager
McConnell Smith, Ltd.