Print

projects/..Subsea7 Valhall


Summer 2003 Subsea7 installed 120 km seismic cables with simultaneous trenching. The seismic cables had geophones every 50 m. These are very fragile, which together with a minimum bending radius (MBR) of 3,6 m, gave a special installation design.

Cable tension units (CTU) 2000 and 800 were put in serial allowing the geophones passing without damage. Cable Guide (CU2500) was further used to reduce layback and ensure accessibility for the trencher.

The installation was done in 9 weeks, on schedule and with no safety incidents.