40m Cutter Suction Dredger

Pontoon type spud carriage system and anchor boom system could be equipped as optional items.
All main parts of the dredger can be dismantled easily for transportation by sea, railway or road.

The vessel is equipped with one main diesel engine driving main dredge pump, one auxiliary diesel engine driving all the hydraulic machineries. One harbor generator is
equipped.

The design and layout of machinery, electrical and automation system, ventilation and air condition to be suitable for following environmental condition:
- Ambient air temperature 50°C
- Air temperature in engine room 55 °C
- River / sea water temperature 35 °C
- Relative, humidity max / non condensing 75%
- Barometric pressure 760mm Hg

PRINCIPLES PARTICULARS
Length of all: 42m(with spud carriage pontoon)
Length over pontoons: 33m(with spud carriage pontoon)
Breadth: 7.5m
Depth: 2.0m
Draft: Max. 1.5m
Dredging depth: Min. : 1.5m; Max. : 14m
Dredging wideth(35° wing angle, each side): 42m at max. Dredging depth45m at min. Dredging depth
Inner Dia. Of suction/Discharge pipe: 600mm/550mm
Dredging pump output capacity:4000m3/h(water flow)
Discharging length: 2500m
Main diesel engine: Cummins KTA50-M2,1342KW@1800rpm
Auxiliary diesel engine: Cummins NTA855-M, 336KW@1800rpm
Harbor generator: Cummins, 30KW@1500rpm
Total installed power: 1708KW
Specific fuel consumption: 256L/H
Cutter: Crown type multi-purpose cutter head, shaftpower 200kw
Spuds: 2 sets, length 18m, ?560mm, collapsible
Spud carriage system: Built-in type, with travelling stoke 4.0m
Anchor Boom (Optional item): Length 14m
Fuel tank capacity: 50m3

The output capacity and discharging length figures are based on the dredging material of the nature of clay / silt/ fine sand, the maximum available power on the dredge pump shaft and in situation of 5.0m elevation height at end of discharge pipe; in actual practice, the the material to be dredged and local working conditions must be considered.

CLASSIFICATION & REGULATIONS & STANDARD
The vessel is to be designed and constructed in accordance with the rules and regulations as below except specially described hereinafter and/or mutual agreed by Owner and Builder.
- China MSA "Regulations for Statutory Inspection of Inland Ships 2011" and amendment in 2015,2016,2018;
- CCS "Steel Inland Ships Construction Regulations 2016"
- Chinese National Standards(GB)
- China Shipbuilding Quality Standard (CSQS) Chinese industrial standards (GB, CB, YB, JB, CSQS), Builder's standards and ISO standards are to be applied to the construction and design of the vessel except the fittings specially described hereinafter

HULL STRUCTURE
Steel for the main deck, bottom, side and fore & aft shell shall be Class approved marine steel plates.
All steel plate surfaces shall be shot blasted to SA 2.5 and primed before fabrication with one coat of compatible shop primer.
All pontoons are single hull structure. The thickness of steel plates of the pontoons shall be as below. The sizes of all scantling of frame, stiffener, girder, support, etc., are to be designed and constructed as per Class requirements.

Main pontoon
Dimension of main pontoon(L*B*D): 15m*3.5m*2.0m
Thickness of deck plate: 10mm
Thickness of bottom plate: 10mm
Thickness of side plate: 10mm
Thickness of front plate: 16mm
Thickness of stern plate: 25mm

Side pontoons
Dimension of side pontoons(L*B*D): 23m*2.0m*2.0m(each side)
Thickness of deck plate: 8mm
Thickness of bottom plate: 8mm
Thickness of side plate: 8mm
Thickness of front plate: 8mm
Thickness of stern plate: 8mm

Spud carriage pontoons
Dimension of side pontoons(L*B*D):8m*2.0m*2.0m(each side)
Thickness of deck plate: 8mm
Thickness of bottom plate: 8mm
Thickness of side plate: 8mm
Thickness of front plate: 12mm
Thickness of stern plate: 12mm

Dredge Pump
Dredge pump is a single wall centrifugal pump, which is optimized design for dredging
operation. The impeller is fitted on the shaft by trapezoid thread directly machine on the shaft end.
The shaft sealing is a water-cooled sealing that can be replaced easily.
The impeller is optimized design with double curved vanes for high efficiency and long wear life.
The pump casing has a shape of a volute designed of a high efficiency and wear life optimized tested in laboratory and onboard of dredgers.
The wear-resisting alloy steel shall be adopted for pump shell, the hardness not less than 48HRC.
The hardness of other wear-resisting components, such as impeller, shaft, etc, shall be not less than 60H

Model: 4000-70
Output capacity(Water flow): 4000m3/h
Head: 70m
Efficiency: 82%
NPSHr: < 4m
Inner Dia. Of Inlet/outlet: 600mm/450mm
Ball passage: 220mm

CUTTER HEAD
Type: Crown Type Cutter Head
External Dia. : ?1800mm
Blades: 5 pieces, material: ZG35SiMn
Teeth: Replaceable, total40 te