Modus completes Vashishta pipeline and umbilical trenching

21 November 2018

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Modus Seabed Intervention 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 pipelines with external diameters of up to 579mm, and a 24km long, 284mm outside diameter umbilical, down to a maximum trench depth 2m. The water depth for trenching operations ranged between 3.5m and 217m 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 and adaptability of the CT-1 to provide on-specification burial and survey from a host of vessels - mobilising safely and swiftly and also offering unrivalled flexibility. The CT-1's configurability to trench in water depths from 3.5m to 3,000m is unrivalled.

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 on the available vessels.

Mobilising a single trenching system to perform such work scopes has obvious benefits, particularly in a location with remote support facilities. 

Modus Seabed Intervention Limited
Beaumont House
Beaumont Street
Darlington
County Durham DL1 5RW
UK
T: +44 (0)1325 387480
F: +44 (0)1325 387481

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