Modus Completes Vashishta Trenching

Modus Seabed Intervention Limited said it has trenched to specification the ONGC Vashishta pipelines and umbilical offshore India for McDermott International.

The work scope included the trenching and surveying of two 18-kilometer pipelines with outside diameters of up to 579 millimeters, and a 24-kilometer 284-millimeter outside diameter umbilical, down to a maximum trench depth 2 meters.

The water depth for trenching operations ranged between 3.5 meters and 217 meters and involved mobilizing the Modus CT-1 trenching vehicle onto the Bourbon 807 for the deeper water sections and then transferring the trenching equipment to the Multicat Zwerver II for the shallow water operations.

According to Modus, the project demonstrated the versatility of the CT-1 to provide on-specification burial and survey from a host of vessels; mobilizing safely and swiftly, offering unrivaled flexibility. The CT-1 can be configured to trench in water depths from 3.5 meters to 3,000 meters.

Nigel Ward, commercial director of Modus Seabed Intervention, said, “The adaptability of CT-1 came into its own; the vehicle was modified by the Technical Services team at Modus to enable the successful burial of both the umbilical and pipelines in deep and shallow waters. To add to the challenge, the overall weight of the vehicle was reduced so that it could be accommodated by the available vessels. Mobilizing the single trenching system to perform these scopes had obvious benefits, particularly to a location with remote support facilities.”