Gunite Lining Replacement in a 159’-9” x 22’-0’ ID Steel Stack

Jansons Gibraltar was contracted to replace the acid-resistant gunite lining in the Unit #4 Stack at Con Edison's East River Generating Sta.

Limited outage constraints necessitated 'round-the-clock' work, seven days a week.  The roof-mounted stack required workers to remove debris from the access opening at the roof elevation and then lower the material to grade elevation for disposal.  Several project highlights included: 

  • Tear-out of approximately 4,000 CF of existing gunite lining and reinforcing steel and mesh.
  • Sandblasting of all exposed interior steel surfaces to a SSPC-6, commercial blast finish.
  • The installation of a 2½” thick gunite lining; including over 20,000 refractory anchors and 425,000 lbs. of calcium aluminate cement.
  • Platform repairs, grating replacement, testport installation, and other miscellaneous repairs.
  • Painting the exterior surface of the stack.