Combined-Cycle Power Plant Construction Completion & Commissioning

Day & Zimmermann provided construction services, safety services, procurement, instrumentation, document control, quality control, supervision, and labor to support construction completion, commissioning, and start-up of a 440 MW combined-cycle power plant in the Northwest. The plant is responsible for approximately 10 percent of the utility’s generation capacity.

The facility uses a highly efficient combined cycle system, with one turbine running off the combustion of natural-gas and the other running off of steam. D&Z supported work on several systems and plant equipment, including the combustion turbine generator, reheat steam turbine generator, auxiliary boiler, selective catalytic reduction (SCR) and CO₂ control systems, and various electrical and I&C systems.

D&Z took over the project when it was more than 50 percent complete and helped the utility meet its federally mandated first-fire date.

PROJECT HIGHLIGHTS

• Mobilized supervision over the winter holidays within days of the request.
• Worked nearly 600,000 hours without any lost-time injuries.
• Completed on time, meeting customer’s federally mandated first-fire date.
• Installed more than 68 miles of cable and performed more than 25,000 hours of cable pulling.
• Performed more than 3,000 welds with an average 0.54 percent reject rate.