Modus Completes Vashishta Pipeline and Umbilical Trenching

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

The challenging scope included the trenching and surveying of two 18km long pipelines with outside diameters of up to 579mm, and a 24km long 284mm outside diameter umbilical, down to a maximum trench depth 2 metres. The water depth for trenching operations ranged between 3.5 metres and 217 metres and involved mobilising 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. The project demonstrated the versatility of the CT-1 to provide on-specification burial and survey from a host of vessels; mobilising safely and swiftly, offering unrivalled flexibility. The CT-1’s ability to be configured to trench in water depths from 3.5m to 3,000m is unrivalled in the industry.

Nigel Ward, Commercial Director of Modus Seabed Intervention, commented: “We are very pleased to have completed the trenching on this project to specification. 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. Mobilising the single trenching system to perform these scopes had obvious benefits, particularly to a location with remote support facilities. The project is good example of Modus’s innovative approach to subsea construction activities”