Page 53: of Marine Technology Magazine (September 2015)

Products & Technologies

ASI Marine & its Mohican ROV perform ASI Marine & its Mohican ROV perform

Deepest Tunnel InspectionDeepest Tunnel Inspection

In June 2015, ASI Marine (ASI) personnel conducted a designed by ASI for tunnel inspections and is controlled and remotely operated vehicle (ROV) underwater inspection of powered from the surface, which allows the ROV to navigate the Cheves Hydropower Tunnel in Peru and ended up break- through tunnels for unlimited periods of time. ing the ASI company record for the deepest ? ooded tunnel In 1999, ASI obtained (and still holds) the record in the inspection at 570 m water depth. The Cheves Hydropower Guinness Book of World Records for the “longest ? ooded tun-

Project is being developed by EMPRESA DE GENERACIÓN nel survey by an ROV” at a different location.

ELÉCTRICA CHEVES S.A., a wholly owned subsidiary of

Statkraft.

The tunnel inspected is approximately 9.8 km in length, with a 35 sq. m. area horseshoe pro? le. The purpose of the inspection was to collect data inside the newly-constructed tunnel for general assessment of rock stress incidences.

The tunnel was inspected internally with a Remotely Oper- ated Vehicle (ROV) equipped with an array of sensors, includ- ing sonar and video, with the purpose of collecting full cover- age data at the headworks and downstream to the powerhouse.

The ROV was speci? cally designed by ASI for this type of work and is unique in the world. This data was required for the client to undertake an engineering structural assessment of the tunnel and detect signi? cant anomalies; such as defor- mations, major cracks, rubble, partial collapses and rock ac- cumulations.

Within a short period of two weeks, and with very limited preparation time, ASI responded to the client’s request, mo- bilizing internationally to the remote location. To perform the inspection, ASI utilized its ASI Mohican ROV, which af- forded ASI a quick response time. This system was specially (Images: ASI) www.marinetechnologynews.com

Marine Technology Reporter 53

MTR #7 (50-64).indd 53 MTR #7 (50-64).indd 53 9/1/2015 4:29:10 PM9/1/2015 4:29:10 PM