CSD500 CUTTER SUCTION DREDGER

Detailed description of CSD500 cutter suction dredger：1. General

The CSD500 Cutter Suction Dredger of steel construction, the non self-propelled, dismountable type, is able to berth and dredge at any waters both in the coastal area and inland rivers, with similar conditions to that in navigation area “A” or below the “A”-line specified in code for inland river steel engineering ship manufacture of P.R.China.

The dredger can be used to excavate and transport cohesive sediment below the class specified in Ⅲ code for dredging engineering construction technique issued by Ministry of Water Resources(MWR) of P.R.China.

In the course of technical designing, we have considered special requirements for tropical climate conditions of Bangladesh such as meteorological and waters distributing state etc.

It’s hull consists of a main pontoon, two side pontoons and one spud carriage pontoon, to be easy to dismantle or mount for transportation by road, rail or water, and is to be easy to reassemble at project site.

The dredger is powered by diesel engines. the main diesel engine is to drive the dredge pump, and the auxiliary diesel engine will in turn power other all equipments such as cutter, swing and ladder winches, and the spud rams etc.

2. Arrangement in whole

You can see the following from foreword to end of the dredger:------cutter------cutter ladder------ladder gantry------anchorboom------swing winches------ladder winch------operating cabin------emergency diesel engine generator set------deck crane------dredge pump------main diesel engine------auxiliary diesel engine------generator and high pressure hydraulic pump, emergency hydraulic pump------two spuds and spud hoisting rams

3. Main parameters

total length(cutter ladder in horizontal position): abt.41.5mtotal length of pontoons: 29.8mbreadth: 8.4mdepth: main pontoon: 2.46m side pontoon: 2.44mmean draught with full bunkers approx.: 1.5mmax. standard dredging depth: 14msuction/discharge pipe diameter: 550/500mmcontinuous power of main diesel engine at 1600r/min which drives dredge pump: 895KWcontinuous power of auxiliary diesel engine at 1800r/min: 339KWoutput: 500m3/h

4. Technical characters

1) HullA. Main pontoon

dimension: 13.0×3.4×2.46msteel plating thickness: bottom plating: 8mm; shell plating: 6mm; deck plating: 6,8,10,12mmnumber: 1

B.Side pontoondimension: 21.0×2.44×2.44m

C.Spud carriage pontoondimension: 7.6×4.0×2.44m

total contents of fuel oil tank: 59m3

contents of fresh water tank: 3.5m3

aboard:

swing anchor(two): 800Kg(each) swing wire length(two): 120m(each) mooring wire length: 28m(each)

2) Suction/discharge equipmentsdredging distance: 1500mdredge pump: type: YWB3100-62 speed: 466rpmsuction pipe: inner diameter: 550mm wall thickness: 8mmdischarge pipe: inner diameter: 500mm wall thickness: 8mm

3) Cutterpower at shaft: 170Kwspeed(max.): 34rpmtype: YWJ1450-170, 5-bladed with serrated edgesdiameter of cutter: Φ1450mm

4) Spudsdiameter: Φ600mmlength: 19m

5) Deck machinery

A.Ladder winch:（one）line pull, 1st layer: 100KNline speed, 1st layer: 0-20 m/min

wire diameter: Φ28 mmB.Swing winches(two)

line pull, 1st layer: 100KNline speed, 1st layer: 0-20 m/min

wire diameter: Φ28 mmC.Anchorboom winches(two)

line pull, 1st layer: 40KNline speed, 1st layer: 0-25 m/min

wire diameter: Φ18 mm

6）Deck crane

lifting power: 30KN（3t）outreach: 3.5m

7) Grease apparatusvoltage: 220/380V, 50HZ

power: 0.37KWcontents of tank: 8L

8) Electric installation

A.Emergency diesel engine generator setvoltage: 230/400V,50HZemergency generator power: 24KW

B.Accumulator battery setnumber: 1set

9) Power enginesA.Main diesel engine

continuous power: 895KWspeed: 1800rpmtype: KTA38-M2make: Cummins in China

B.Auxiliary diesel enginecontinuous power: 339KWspeed: 1800rpmtype: KTA19-Mmake: Cummins in China

10) Auxiliary equipmentsA.Gland pump

number: 2capacity: 50m3/hmanometric head: 0.8Mpa

B.Cooling water pumpcapacity: 40m3/hmanometric head: 0.3Mpa

C.Oily-water separatorcapacity: 50m3/hdischarge distance: 20m

D.Hydraulic motornumber: for cutter drive: 1 for ladder winch: 1 for swing winches: 1 each

E. Spud hoisting rams diameter: 160mm ram stroke: 2.1mF. Ventilation number of fans: 2 capacity (each): 5,000 m3/h

5. Building & Equipments1) Hull

The hull of the dredger has a rectangular shape and is subdivided into 3 pontoons:

---one main pontoon---one side pontoons on port side---one side pontoons on starboard side---one spud carriage pontoon on the end of main pontoonThe hull is of all welded, steel construction to give the dredger the necessary strength required for dredging operations. The side pontoons are connected to the main pontoon by means of bolts.

2) Deck arrangement

Manholes, tanks, hatches to the engine room, a hatch to permit passage of dredge pump parts are fitted on the pontoons, including open railing, ventilation, signal mast, nameplates etc., and corresponding bollards, lights, hawsers too.

3) Piping systems

For the draining of the dredger a bilge pump with pipes is installed. The ballast tanks are executed with suction/filling pipeline, fuel tanks and waste oil tank are provided with air pipeline, filling pipeline and lubricating pipeline. In addition, fuel oil pipeline, lubricating oil pipeline, cooling water pipeline, and hydraulic oil pipeline etc. are provided.

4) Dredge pump system

Dredge pump is connected with main diesel engine though a reduction gearbox. The casing and impeller is made of abrasive resistant metal alloys. Water flushing sealing is arranged on the suction and shaft sides of the pump. Reduction installation has a clutch and lubrication cooling system. Suction pipe is connected to suction cover of the pump though suction hose pipe. A non-return valve is installed on board in the discharge line, in addition, included vacuum and pressure gauges for dredge pump etc.

5) Cutter

The cutter is of the 5-bladed crown type with serrated cutting edges, and the heavy duty one piece cutter is replaceable edges. Hydraulic motor drives the cutter mounted on the cutter ladder which is hinged to the main pontoon, and the suction pipeline is fitted under the ladder by means of brackets, has a special suction mouth.

6)Deck auxiliaries

Two swing winches is positioned on the deck, and driven by a hydraulic motor. The cable speed can be regulated, the winches can be braked.

Other one ladder winches is positioned on the deck, and also driven by a hydraulic motor. The cable speed can be regulated, the winches can be braked, and secured by a hand-operated locking pin.

Deck crane is equipped with a hand-operated tackle for hoisting pump parts, can be gyred.

Operating cabin is positioned such as to give good view in all directions, and arranged two control master console and corresponding instrumentation, signal and operating & control switches. A separate intercom system is provided between control and engine room, to ensure that one man can handle the controls all whole dredger conveniently, effectively and safely.

The two spuds are of heavy wall tubular steel with cast steel points positioning holes and pins at the aft end of the dredger, and titling facilities for spuds is equipped on the dredger in order to keep water level for spuds, is good to navigation and transfer to project site.

7) Hydraulic system

The hydraulic system is to consist of two double vane hydraulic pumps with high pressure driven by the auxiliary engine, to supply hydraulic oil for overall hydraulic installations, and to include filters, coolers, and corresponding indicating gauges, simultaneously to provide emergency hydraulic pump to supply power, in case of stoppage of auxiliary engine.

8) Electrical system

Electrical system is to consist of a emergency diesel engine generator set of 24KW to supply power for all electrical power installations: lighting, signals, battery charger, funs.

Electrical system is equipped with switch boards and power take off panels.Electrical system is equipped with an accumulator battery set for starting diesel engines, emergency lighting and electromagnetism valves controlling.

9) Power engines

the dredger has a main diesel engine to drive dredge pump, an auxiliary diesel engine to drive generator and high pressure hydraulic pump, an emergency diesel engine generator set to drive emergency hydraulic pump and supply electrical power at case of stoppage of dredger, for protection of all auxiliary equipments of dredger. Diesel engines and emergency diesel engine generator set both have corresponding indicating gauges, and warning devices.

10) painting

All steel surfaces are prepared to receive marine type zinc primes prior to painting. Pursuant to relevant code or fitting buyer’s requirements, dredger is painted with non-corrosive marine grade enamel or other one which is used in the salt water.

6. Trial and inspection

A pre-shipment trial of diesel engines, generator, hydraulic system etc. of the dredger, is carried out to adjust and test by supplier.

7. Pipeline system (total length 500m, including 350m floating pipe, 150m shore pipe)

Pursuant to buyer’s requirements, the supplier may provide the pipeline of floating and shore section at extra cost, not included in the dredger price, and warranty their reliable performance and quality to fit the requirements for transporting soils and sands.

The design is to include the number of pipe sections, pipe sections with flanges, hoses, floaters, and all other necessary components and equipment.