Maintenance & Modifications

Day & Zimmermann has the unique experience and technical expertise to successfully deliver a broad spectrum of plant maintenance and modifications projects, including refueling outages and online support, as well as major plant upgrades and construction projects. We can deliver projects of all sizes and levels of complexity and routinely support both planned outages and emergency call-out outages. We also have the ability to efficiently provide all disciplines of labor and self-perform all major workscopes.

Our portfolio of services is extensive and includes:

 

  • Maintenance/Modifications
  • Construction
  • Condenser Services
  • Valve Services
  • Turbine Services
  • Radiological Services
  • Asbestos Abatement/Insulation
  • Turnkey Scaffold Services
  • Painting & Coating
  • Professional Staffing
  • Fabrication & Machining

Our full-service capabilities also include field engineering and work package planning, estimating, scheduling, as well as cost tracking, project management, QA/QC and site access processing. 

 

Nuclear Sector Expertise

Day & Zimmermann is the leading maintenance provider to the U.S. nuclear fleet. We have extensive experience with individual major project execution including extended power uprates, control room renovations, ISFSI construction, containment sump strainers, major piping modifications, plant security upgrades, feedwater heaters, condensate filtrate systems, RWCU modifications and turbine retrofits.

 

Fossil Sector Expertise

Boiler maintenance, including associated ductwork and equipment, accounts for approximately 25-30% of our annual fossil volume. This work is performed during both emergency and planned outages. We maintain all of the required weld procedures and stamp certifications to perform boiler work in accordance with the applicable codes. Day & Zimmermann is historically ranked among the top five users of boilermakers in the U.S. by NACBE, averaging approximately 1.3 million boilermaker hours annually.


In addition to routine boiler maintenance, we have extensive experience with individual major project execution, including:

 

  • Waterwall, Slope & Element Replacement
  • SCR Construction
  • Reheat & Superheat Header/Element Replacement
  • Scrubber System Modifications
  • Control Room Modifications
  • Low-Nox Installations
  • Feedwater Heater Replacement
  • High Energy Pipe Replacement
  • Air Heater Replacement
  • Coal Handling Equipment
  • DCS Installation Condenser & Heater Retubing
  • Precipitator Rebuild
  • Pipe Installations
  • Coal Bunker Reline
  • ID & FD Fan Refurbishments
  • Coal Car Dumpers