PMI-Dominion Power – Ash Recycling Plant

Location: Chesapeake, Virginia
Description: Crowder Construction Company installed a new Ash Recycling Plant for PMI at Dominion Energy’s electric generating facility in Chesapeake, Virginia. The new process transports ash from two of the four existing boilers to a new fluidized combustor. The combustor burns the ash at high temperatures, removes the carbon and produces a marketable grade fly ash for use in Portland cement. The carbon burnout technology is environmentally friendly; by recycling the ash, the need for disposal in landfill areas is reduced. Crowder’s scope of work included installation of all equipment, ash-transporting ductwork, ash silos and other associated work.

Army Corps of Engineers - Hydroelectric Dam Power House

Location: Elberton, Georgia
Description: Crowder constructed the power house facility at the Richard B. Russell Hydroelectric Dam. The scope of work included, but was not limited to, the forming, placement and finishing of over 160,000 cubic yards of concrete, structural steel erection, extensive piping, erection of four 75 MW turbines, miscellaneous equipment erection, electrical work and controls. While self-performing the majority of work associated with this project, Crowder employed over 600 craft personnel and completed the project within the scheduled time frame.

Allegheny Energy - Gas Turbines

Location: Prentiss, Mississippi
Description: Scope included piping and electrical installation for three GE Frame 7 EA gas turbines. Work included all underground piping and electrical. Additional piping consisted of skid-mounted systems for cooling water, gas, air, demineralization water, lube oil, inlet-heated air, fire water, carbon dioxide, plant air, potable water, raw water, fuel and gas filter and heaters, water wash skid, and oil mist eliminator. Pipe materials used consisted of stainless steel, carbon steel, and high-density polyethylene (HDPE). The project also included electrical and instrumentation to skids, motors, pumps, MCC rooms, and related equipment.

Voridian – River Water Pump Well

Location: Gaston, South Carolina
Description: This project included the construction of a pump well for a new river water intake system. Crowder performed all civil, mechanical, and electrical work associated with this four-story concrete intake structure. The structure had over 1300 cubic yards of concrete with 220 tons of reinforcing steel constructed to accommodate six pumps which provided this multi-process chemical plant with over 80,000 gallons per minute of river water. The scope of work also included excavation and backfill; installation of 54 inch diameter prestressed concrete cylinder pipe (PCCP), 36 inch diameter carbon steel pipe, miscellaneous metals and handrails; and electrical and instrumentation work.

Southern Environmental - Duke Energy’s Marshall Steam Station Precipitators – Units 3 & 4

Location: Terrell, North Carolina
Description: Electrical construction for replacement of two electrostatic precipitators. The scope of work for this project included the installation of four 4000 KVA 4160V-480V transformers and associated switchgear; precipitator power distribution and controls equipment (AVC, TRCC, TR, rapper, ash hopper systems); installation of the fly ash pneumatic conveying system power and control systems; lighting and receptacles; equipment grounding; and pulling, termination, and testing of feeders and control wiring for the scope listed above. Work that was added to the scope of this project included identification and demolition of existing plant precipitator power and control systems, installation of small equipment foundations, installation of a tower crane foundation, site safety support, and installation and removal of temporary sight lighting.

Duke Energy – Waste Water Treatment Facility

Location: Belews Creek, North Carolina
Description: Construction of a new waste water treatment facility to support the flue gas desulfurization project. This project included all design and construction; site preparation; roadways; storm drainage system; the formation, placement, and finishing of concrete foundations for process tanks and buildings, a concrete bio-reactor unit and a concrete filtrate sump; the erection of two pre-engineered buildings, one structural steel filter press building, two clarifiers, miscellaneous steel and fiberglass tanks, pipe racks, steel and fiberglass walkways, stairs, and platforms; the installation of all associated electrical and instrumentation work and process piping, which included 12,000 feet of high-density polyethylene (HDPE) pipe, ranging from 2 inches to 28 inches in diameter.

Baconton Power Plant – LM 6000 Gas Turbines

Location: Baconton, Georgia
Description: Installation of six LM 6000 gas turbines, including all support facilities. The mechanical piping ranged from small bore through 18 inch diameter stainless and carbon steel, high-density polyethylene (HDPE), and chlorinated polyvinyl chloride (CPVC). The work included all skid-mounted processes for fuel gas filter separator skid, water wash skid, carbon dioxide fire protection skid, water treatment, cooling tower, chiller and fire loop. Electrical work included power wiring through transformers and balance of plant, electrical and instrumentation of MCC rooms, GE Mark V control panels and switches.

Dominion Energy – Gas Turbine Generators

Location: Cedon, Virginia
Description: Turnkey installation at the Ladysmith Combustion Turbine Station of two GE Frame 7FA gas turbine generators with appurtenances. Dominion Energy provided the gas turbines and associated equipment and Crowder erected and commissioned the units. Additionally, Crowder provided the engineering, procurement and construction of the balance of the plant. The GE 7FA units are rated at generating a base load of 170 MW each and were installed with inlet air fogging systems to boost generation during the high temperature summer months and help Dominion meet the community’s peak generating demands. Crowder also designed and built a dual fuel system to allow the use of fuel oil as well as natural gas to run the units.

While Crowder performed the underground, civil, mechanical, piping, equipment erection, controls, electrical and instrumentation, Crowder’s in-house fabrication facility fabricated pipe spools, platforms and miscellaneous metal materials proficiently to expedite the construction progress.

Duke Energy – Ash Handling EPC Project

Location: Terrell, NC
Description: This was a design/build project for an ash handling system upgrade. The system included “slip form construction” of two 50 feet diameter by 95 feet tall concrete ash storage silos, the installation of over 1500 linear feet of piping, blowers, and associated equipment for the pneumatic conveyance of fly ash. Electrical installation included nine 5kv 250 hp motors with feeders and terminations, a 5kv primary 1000 KVA oiled filled transformer and two 5kv primary 300 KVA dry type transformers, custom 5kv switchgear to match existing units and a 480 volt motor control center. A new 2500 I/O point DCS Ovation System was installed to control the entire system while an existing Reliance System was incorporated to interface with the new system. The project team developed logic, graphics, and Boolean language for input into the new Ovation System. A grounding and lightning protection system was also installed.

Dominion Power – Coal Handling Project

Location: Chesapeake, Virginia
Description: This project consisted of the engineering, procurement and construction of a new ship unloading dock and coal-handling facility for Dominion Energy. The general scope of work consisted of over 1500 feet of a conveyance system, including a tubular galley spanning from dock to land, a truss section carrying coal from the shore line to a 80 feet cantilevered truss section at discharge. The system was designed to carry 2000 tons of coal per hour on 54 inch belts running at 700 feet per minute. 300 linear feet of pier was designed and constructed to moor ships during unloading and also support a portion of the new conveyance system. Crowder self-performed the majority of all work on site, including foundations, mechanical work, structural erection, and electrical work. All of the tube galley, truss sections, cantilevered truss section, hoppers and other major components of the conveyance system were fabricated at our in-house fabricating facility.