ROV Penetration Inspections of: Farr Pump Plant, Willow Creek Intake, and Grand Lake Intake

Farr Plant Intake Inspection
AUS conducted the Farr plant intake inspection which required the internal and external inspection of the intake structure utilizing a SEAEYE Falcon ROV. The structure was located in 113 feet of water at an altitude of 8200 feet. A wet diver team was utilized to remove a 48-inch diameter access hatch to allow entry into the intake structure. In conjunction with the ROV inspection, an 8000-pound dewatering bulkhead was placed and removed in 3 separate positions to allow the three six-foot diameter intake tunnels to be dewatered.

Willow Creek Intake inspection: AUS provided an internal and external inspection of the intake trash rack structure at Willow Creek. The intake is located in approximately 40 feet of water at an altitude of 8200 feet. The 120-foot vertical drop shaft and the 300-foot horizontal 6-foot diameter concrete intake pipe were inspected. At the end of the pipe, the closed guardian gate was inspected. A wet diver was utilized to remove a trash rack to provide access for a Seaeye Falcon ROV to perform the required inspections.

Grand Lake Intake Inspection: AUS provided an internal and external inspection of the Grand Lake intake trash rack structure, located in approximately 80 feet of water at an altitude of 8,200 feet. The 120-foot vertical drop shaft, and the 350-foot horizontal six-foot diameter horizontal pipe were inspected, reducing down to 24 inches for the last 25 feet.

The twin guardian gates at the end of the line were inspected. A wet diver removed the trash rack to allow for ROV access. A Seaeye Falcon was utilized to perform the majority of the inspection in the larger diameter pipe. A Seabotic LBV 200 was used to examine the condition of the 24-inch diameter pipe and guardian gate.