The following images give an idea of the complexity and scope of the work involved in the Steam Unit 3 overhaul. The project to tear down, overhaul and rebuild ST3 began on March 2, 2017 and was completed by May 9, 2017 when the unit went back online.

Contractors prepare to unload the second of two urea tanks off of the flatbed trailer on which it arrived.

 

The second urea tank is lifted by two cranes.

 

The second urea tank is moved toward the location where it will be placed.

 

Contractors help steer the urea tank into place.

 

Now that that urea tank is positioned to land on its bottom end, one crane lowers it into place.

 

Contractors guide the urea tank as it is lowered a few more feet.

 

With the second urea tank in place, contractors secure it to the concrete pad.

 

The cement pads (right of crane) where the new urea tanks are installed.

 

Casey contract workers sort materials on the cement pads for the new urea tanks.

 

Danny Romero, with Casey contractors (l) supervises the concrete work on the sump and cement pads for the new urea tanks.

 

Anthony Descheenie (r), and a contract worker, both with Epic West contractors, during final installation of the classifier piping on the crusher-dryer deck of ST3.

 

Nestor Vasquez, (r), of Epic West contractors, inspects the work being performed on the burner deck of ST3. Vasquez is the site superintendent.

 

A contract worker welds on walkways over the low-NOx burners on ST3.

 

Contractors install the igniter gas valve on the burner deck of ST3.

 

Contractors refer to blueprints during the low-NOx burner installation of ST3.

 

Contractors install ignitor gas valves on the burner deck of Steam Unit 3.

 

Turbine construction crew removes turbine diaphragms for inspection.

 

Turbine construction crew removes turbine diaphragms for inspection.

 

AzGT Executive Director of Power Production Mike Nelson monitors low NOx burner installation with Thomas from Epic.

 

The Epic crew installs low NOx burners on ST3.

 

Nelson stands with Thomas from Epic during their low NOx burner installation.

 

Nelson examines burner coal valve replacement with Auxiliary Operator Rance Adams.

 

Maintenance Mechanic Brent Winkler (l), Rance Adams and Auxiliary Operator Creed Cristinat stand together during burner coal valve replacement.

 

Brent Winkler and Creed Cristinat work together on burner coal valve replacement.

 

Instrument Technician Ed Sanchez (in blue, right) works with the turbine construction crew.

 

Turbine construction crew removes turbine diaphragms for inspection.

 

These pictures have been provided by Chad Kew, AzGT instrument technician.

 

Burner front has been removed and is ready for new burners to be installed in Steam Unit 3.

 

Burner front has been removed and is ready for new burners to be installed in Steam Unit 3.

 

New air dampers are prepared for installation.

 

New controls cabinet for burner control.

 

 

New wind box plates are installed.

 

 

Burners will be installed inside this new wind box.

 

New urea tank groundwork.

 

New burner wind box sits ready for installation.

 

New burner air dampers that are already installed.

 

Coal valve pipes with the valves removed for repair.

 

New tank groundwork.

 

Coal valve repair.

 

Turbine diaphragm removed and ready for inspection

 

Turbine diaphragm removed and ready for inspection.

 

Disassembled turbine parts.

 

Turbine lower shell empty.

 

Generator stator inspection.

 

Turbine parts are removed and are repaired and cleaned.

 

Turbine rotor being repaired.

 

Turbine rotor being repaired.

 

Temperature recorder replacement for turbine and boiler.

 

Expansion modules for temperature recorder.

 

Expansion modules for temperature recorder.

 

Turbine temperature recorder replacement.
Steam turbine rotor is being inspected after cleaning.
Side view of the rotor’s low pressure section.
Side view of the rotor’s high pressure section.
A view of the rotor shaft at a different angle.
High pressure turbine casing.
Looking into the throat of the generator stator.