Dredging Fleet

Hopper dredger "Onezhskiy", project 686

Type: twin-screw, self-propelled trailing suction hopper dredger dragging suction pipes equipped with hydro-scourers, bow thruster.
Designation: dredging job with carriage of ground in hold for unloading either by opening of 12 single bottom doors in row (six doors portside and six doors starboard side), or using self discharger (pumps) for deposition of pulp through the sludge line at the distance up to 400 meters with height of stack place up to 4 meters.
Allowed weather conditions: wind force up to 5 Beaufort scale with max height of wave 1,75 meters (pitching) or 1,25 meters (rolling).

Vessel Year Call sign
1 Onezhskiy 1966 UFRK

Vessel scheme

Vessel scheme


Technical Indicator Data
Russian Register class KM ⍟ L3 dredger
Year built, Builder 1966, Glasgow
Length overall 82,07 m
Beam 14,10 / 13,72 m
Depth 5,18 m
Max Draught at dredging work (Loaded) 4,19 m
Light draft  bow 1,77 m
Light draft  aft 3,29 m
Deadweight 1747 t
Gross tonnage 1944 rt
Net tonnage 583  rt
Hopper capacity (full loaded) 1180 cbm
Hopper capacity (overflow up to low level) 785 cbm
Suction pipe diameter 600 mm
Discharge pipeline diameter 600 mm
Dredging pump (number and ouput, h.p./kw) 2 * 350 / 255
Dredging capacity (max) * 1000 cbm per hour *
Pumping capacity for deposition of pulp through the sludge line ** 700 cbm per hour **
Max Dredging depth 15 m
Min Dredging depth 5,5 m
Min required Length of dredging area 500 m
Min required area for one hundred eighty degrees turn 140 m
Speed loaded 10,6  knots
Speed in ballast 12,2  knots
Main engines KCCM6 "Mirrlees"
Number x output 2 x 1510 / 1111 h.p./kw
Recommended Oil MDO Dist DMB (ISO 8217/1996)
Fuel consumption (daily):  
  Sailing 8,5 t
  Dredging 8,0 t
  Deposition through the sludge line 7,0 t
  Stoppage during dredging job 1,9 t
  Idle staying 0,99 t
Bunker capacity 210 t
Fresh water capacity 118 t
Bow thruster 350 h.p.
Crew 26 persons
* Dredging capacity depends on type of soil to be dredged.
** Pumping capacity for deposition of pulp through the sludge line depends on length of line as    well as of height of stack place.