Subsea Cable Trencher – ST 2

ST-2 is a simple, efficient and cost effective subsea trencher designed to operate in sands, silts and clays at water depths up to 30 m. This trencher uses jetting method, is controlled by divers and works in combination with the pump barge where the water pump and monitoring and data acquisition system are located.

Highlights:

Water depth up to 30 m, trench depth up to 2,2 m
Max. product size – 200 mm
The most cable friendly burial method
Positioned and moved over the pre-laid on the seabed cable line without manual handling
Light construction that expedites deployment and relocation offshore
High efficiency in loose and soft soils
Capable of additional burial with second pass
Safe operation in close vicinity to subsea structural members of offshore facilities
High degree of trench backfilling

Equipment set:
Subsea trencher (Dimensions: 5,1 m х 4,0 m х 1,3 m; Weight: 0,7 t) – 1 no.
Pump barge complete with water pump and control cabin (Dimensions: 12,8 m х 4,5 m х 4,8 m; Weight: 12 t ) – 1 no

General:

Depth rating: 0-30 m;
Dimensions: 5,1 m х 4,0 m х 1,3 m;
Weight in air: 0,7 t;
Drive: self-propulsive by hydro jet effect;
Speed (burial) 0,01 – 1 km/h;
Frame structure: stainless steel;
Base mounting: wheel-mounted;
Max. product size: 200 mm;
Trenching method: Jetting;
Trench depth: 0 – 2,2 m;
Soil type: silt, sand, aleurite, clays (up to firm ones);
Soil strength: up to 60 kPa;
Pump flow rate: 800 m3 /h (up to 16 bar);
Jet nozzles: Up to 60 nozzles configured to suit project specific requirements;
Monitoring and data acquisition: C-tecnics CV1000 C-Vision;
Camera: C-tecnics CT3015, 1 no.;
Lighting: C-tecnics CT4006 LED, 1 no.;
Trench depth sensor: LJ 2816; LJS 0250 N 0.3T S 2816;
Pitch & Roll sensor: G-NSDOG2-002 MEMS;
Cable angle at bellmouth: RT 0579B; RTS 090 1TS 0579.