Project
Planned Outage of Omaha Public Power District
Planned Outage of Omaha Public Power District
City of Omaha, Nebraska
Replacing Front and Rear Full Coutant Slope, Finishing Superheater Pendants, Boiler Repair, Change-outs for Burners, Water Cannon Panels, Air Swirlers, Auxiliary Steam and Desuperheater Tube Section
Unit 1 of Nebraska City, a 648 MW Unit located off the Missouri River, hired Total-Western to assist with a planned outage. The scope of maintenance work included replacing both front and rear full coutant slope, finishing superheater pendants, boiler repair, as well as change-outs for burners, water cannon panels, air swirlers, auxiliary steam and desuperheater tube section.
Total-Western engineered a supported scaffolding to manage the work on the slope, pendants and penthouse simultaneously. Rigging was executed from underneath to facilitate the coutant slope removal, while a full boiler scaffold was built all the way up to the superheater pendants. The scaffolding design ensured panels could be replaced unencumbered, and boiler integrity was maintained by managing a sequence of panel removal and installation. An SH outlet header was removed and replaced with a new one along with a new SH section.
During the first 20 days of the construction work, the temperature never rose above freezing and, at one point, the Missouri River flooded, resulting in a two-day evacuation of the power plant. Despite these setbacks, the team continued working around the clock and was able to complete this civil project safely – two days ahead of schedule. The team put in a total of 89,111 man-hours, executed 10,087 code butt welds, and had zero recordables.