These geotechnical operations are performed onboard drilling vessels M/V Bavenit, M/V KIMBERLIT and a special vessel M/V KERN with different drilling equipment.
Coring is performed onboard M/V Bavenit with a special system STACOR.
Vibrocorer assembly UGVP-132M is used to take soil cores with M/V Kimberlit and M/V Kern.
Vibrocorer assembly UGVP-132M (Russia) is used for soil sampling within 100 m sea depth. In process of coring a drilling vessel is kept at the given position with bow thrusters and bowing anchor. The assembly is lowered on the sea floor with a deck crane (or A-frame). It is consisted of a base frame, guide poles with mounted on them sliding frame with attached drill tool. The drill tool includes vibrocorer unit GU-108 and a double core barrel assembly.
- Type of base – frame;
- Core barrel — 127 mm OD; length -5.6 m
- Core receiver – 108 mm;
- Core diameter – 99 mm;
- Drilling diameter – 132 mm;
- Pressure drop– 1.5-4.0 MPa;
- Flow rate – 120-200 l/min;
- Bullet frequency – 4-20 Hz;
- Weight of the assembly – 340 kg;
- Rate of penetration – 5-15 m/hour.
At sea depth in excess of 100m gravity tube is used to take soil cores (ID 122mm, 5 m core catcher).
Grab sampler OCEAN is used to take soil samples from the seabed surface.