Removal & Replacement of a 166' tall roof-mounted dual wall steel stack

Jansons Gibraltar erected a 166' x 10' ID dual-wall, guyed steel stack at the congested Seattle Steam Station, located in Seattle's waterfront district, adjacent to the popular tourist attraction, the Seattle Farris Wheel.  This unique 'remove and replace' project included many challenges in addition to working at an extremely congested site.  A few of these included:

  • The existing roof-mounted stack was severely corroded; which necessitated taking special precautions before and during the dismantling operation.
  • Obtaining necessary building permits for the crane and closure of an adjacent parking lot.
  • The stack was dismantled in sections using multiple cranes, including a 450-ton hydraulic crane with a 105' radius.
  • Sections were lowered to an adjacent parking lot and immediately removed from the site for salvage.
  • Due to the complicated arrangement of flues entering the stack immediately below the roof elevation, the original stack base and anchor bolts were rehabed and the replacement stack was erected on the existing base. 
  • The design included a 2-level guy system