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).
|Russian Register class||KM ⍟ L3 dredger|
|Year built, Builder||1966, Glasgow|
|Length overall||82,07 m|
|Beam||14,10 / 13,72 m|
|Max Draught at dredging work (Loaded)||4,19 m|
|Light draft bow||1,77 m|
|Light draft aft||3,29 m|
|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):|
|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.|
* 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.