5500m3 Trailing Suction Hopper Dredger

1.Principal dimensions and main parameters

2.  This trailing suction hopper dredger is approved by CCS class. It is constructed under CCS supervision.

3.  General characteristic

3.1.  Self-propelled  trailing  suction  hopper  dredger  with  the   functions  of  hopper dumping, rainbow and pumping shore.

3.2. It is a single steel deck ship with bulbous bow and twin tail fin. The wheel house is located on the top of poop.

3.3. Two main engines, twin propellers and twin rudders with electrically driven bow thruster.

3.4. Dredging in great costal area and navigating in unrestricted area.

3.5. Hopper capacity: 5586m3

 3.6. Soil loading capacity: 7260 t

3.7. Max. dredging depth: 30m

3.8. Suction pipe/discharging pipe diameter: 800/750mm

3.9. Two trailing suction pipes with three lifting points

3.10.   Totally   16   conic   hopper   bottom   doors   of    Ф 2460mm   and    16   hopper self-emptying doors, arranged in two lines

3.11. Two overflow tubes of DN1360mm with a stroke of 3000mm to adjust the hopper capacity

3.12. hopper Loading time: abt 56 min

3.13. Time of hopper dumping by Hopper Door: 5 min

3.14. Time of pumping ashore by self-emptying system (hopper filled with medium and fine sand, 1.3t/m3 in density, pumping distance abt 1500m): ~70 min.

3.15. Full loaded navigation speed: 11.5kn, Dredging speed (two suction pipes dredge, converse water current speed 4kn): 2-2.5kn.

3.16. MGO. Used for all engines onboard, oil stored in tanks is 566 m3

3.17. Complement: 36P

3.18. Total installed power of engines: 11910Kw

3.19. Dredging operation type:

After the soil is dredged into the hopper, the soil

a. can be dumped by hopper bottom doors.

b. can do rainbow by self-emptying system

c.  can  be  pumped  ashore  by  self-emptying  system  connecting  with  pipeline  by fast-connection ball joint.

The vessel can use one or two suction pipes to dredge, it can supply a head of 150m high-pressure flushing water for any one of the drag heads to improve the suction efficiency when needed.

4.    Main equipments

4.1. Two propulsion main engine, model: GN8320ZC2B(S) GN8320ZC3B(P), rated

power: 2500kW, speed: 750r/min, produced by Ningbo C.S.I. Power & Machinery Group Co., Ltd.

4.2. Three 450kW generator sets, Diesel engine:    model is CW6200ZC－39 with the rated power of 540Kw and speed of 1000r/min, produced by Weichai(Chongqing) Heavy Machinery Co., Ltd.    Generators model: TFXW-450M6-H.

4.3. One 120kW emergency generator set, diesel engine: model is WD615.67CD with the rated power of 138kW and speed of 1500r/min, produced by

Weichai(Chongqing) Heavy Machinery Co., Ltd.; Generator: TFXW-120M4-H

4.4. Two Dredge Pump engines, model: GA8300ZC16B, rated power: 2000 kW, speed:

600r/min, produced by Ningbo C.S.I. Power & Machinery Group Co., Ltd.

4.5. Two dredge Pumps, produced by Holland Breeman Special Product B.V..

when hopper loading: water flow 11880m3/h, head 21m, pump shaft maximum power 1073kW at the speed of    215r/min

when pumping ashore: water flow 9146m3/h, head 34m, pump shaft maximum power 1468kW at the speed of 240r/min

4.6. Two jet pump engines, model: 8190ZIC, continuous power: 720kW, speed: 1450r/min, produced by Jinan diesel engine work.

4.7. Two jet pumps, model: OTS400-6208, water flow: 2500m3/h, head: 80m, can be used for diluting mud when dumping and self-emptying, or work in series to

provide a head of 150m to flush drag head when dredging, produced by Feixuan pump factory.

4.8. Main engine gearbox, dredge pump engine gearbox and jet pump engine gearbox are all produced by Hangzhou advance gearbox group company

4.9. One electric bow thruster, model: TT1300B/BMS-CP, power: 375kW, CPP speed: 384r/min, diameter:1300mm, thrusting force: 60kN, produced by Jiangsu Sixin

marine mechanical Co., Ltd.

4.10. Propulsion propeller (fixed pitch), diameter: 3700mm, 5 blades, speed:174r/min

 4.11. Four air compressor, model: LSHC-50A, Q=30m³/h, P=3MPa

4.12. One fuel oil/exhaust gas boiler, model: LYF0.5／70-0.7,vaporization capacity 500kg/h, working pressure: 0.7MPa

4.13.  At  aft  and  fore  of  hopper,  there  are  one   15tx15m  and  one  8tx15m  crane, electrically driven.

4.14. One WFCB40 sewage treatment plant, two CYSC-1 oil water separators 

4.15. Seven Lub. Oil and fuel oil purifiers, produced by Nanjin luzhou mechanical factory

4.16. Two hydraulic windlasses of  ￠46mm(AM3)    are installed on forecastle deck.

4.17. one 50kN winch is arranged on poop deck

4.18. One 250 kN hydraulic steering gear

4.19.  One  fully  enclosed  type  life  boat  on  aft  of boat  deck,  one  rescue  boat  on starboard,

4.20. One set of center air conditioner, model: CJKR-151, cooling capacity:  175kW, heating capacity: 186kW. Cabinet type air conditioners are used in wheel house, galley, E/R monitoring room and P/R monitoring room, produced by Zhaosheng air conditioner group China.

4.21. Rated pull force of winch for drag head and intermediate gantry are 400KN and

350KN  respectively,  and  bend  hydraulic  winch  rated  pull  force  is   160KN, pumping ashore Ball Joint hydraulic winch rated pull force is 250KN, produced by Shanghai Dongfang hydraulic company.

4.22. The DN800mm trailing suction pipe is capable of dredging 30m in depth at an angle of 45 degrees, drag head width is 3.0m.

4.23.  Communication/navigation  equipments  such  as  radars,  M/HF  radio  system,

INMARSAT-C, etc are Japan FUAUNO and international brand products.

4.24. VDR and AIS are provided

4.25. Computer remote control device to be provided for main engines, operated on navigation console by single stepless handlebar. Dredge pumps and engines, jet pumps and engines can be remote operated through control panel in wheel house. Control board of bow thruster is installed on navigation console.

4.26. ANSCHUETZ gyro compass autopilot operation system is provided

4.27. Monitoring alarm systems are provided on consoles in engine room and pump engine   room,   to   display   running   parameter   and   print   record   for   main equipments.

4.28. As per rule, fire alarm system, general alarm system and engine room combined alarm system are provided

4.20. CO2 system is provided for engine room and pump engine room

4.30. In engine room, fixed type water-based local fire fighting system is provided

 4.31. Dredging monitoring system

Including  dredge  pump  vacuum,  pressure  measurement  and  display;  mud  flow, density measurement and display, the data is computerized to display production, and  print  result.  Besides  the  display  by  screen,  important  parameters  such  as vacuum,  pressure,  flow  speed  and  density   etc  are  displayed  by  gauges.  Two computers of dredging monitoring control system all can display draft, loading data and suction tube position. Draft pressure sensor used is imported high precision, low temperature  draft  capacitance  type  micro-pressure  transmitter.  Overflow  tube

position display and hopper door open/close control display are on dredging control panel. When use self-emptying system to pump ashore, through the dredging control panel to control diluting water-leading valve and starboard dredge pump suction valve, and show valves’ open degree. On the simulation map of dredging control panel, use PLC to control display the gate valve, butterfly valve and self-emptying door in the system.

4.32. DGPS positioning system is equipped to provide navigation aid positioning and dredging control information to dredger so that to achieve the position accuracy of sub-meter and bow direction of 0.5 degree.

Applications

Port & channel dredging, waterway deepening and maintenance

Harbor expansion, land Reclamation and beach nourishment

Offshore sediment excavation, silt & sand extraction

Coastal engineering, dredging support and land reclamation projects

Key Advantages

Excellent ship condition, well-maintained and fully functional

Large hopper capacity: 5,586 m³; loading capacity 7,260 tons

Strong working depth: max. 30m dredging depth

High efficiency: fast loading (~56min), quick dumping (~5min)

Flexible operation: bottom dumping, rainbow, pump ashore & bow blowing

Dual dredge pumps + high-pressure jet pumps for high efficiency

CCS class certified, self-propelled, suitable for unrestricted sea area

Full set of monitoring, DGPS positioning & intelligent control system

Stable power system: total installed power 11,910 kW

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