5500m³ TSHD Specification List
Vessel Type: Trailing Suction Hopper Dredger (TSHD)
Date of Completion: Jan 6, 2009
Overall Length: 105.75m
Length Between Perpendiculars: 95.80m
Load Waterline Length: 98.05m
Molded Breadth: 18.8m
Molded Depth: 8.6m
Light Draft: 4.200m
Full Load Draft: 6.750m
Load Displacement: 11112.100t
Light Ship Displacement: 3513.930t
Cargo Carrying Capacity: 7012t
Gross Tonnage (GT): 5125
Net Tonnage (NT): 1537
Hopper Capacity: Approx. 5372.37m³
Design Speed: Approx. 12.5kn (under design draft, full power, calm sea)
Endurance: Approx. 3000 n mile
Total Crew: 32 persons
Navigation Area: Domestic Coastal Waters (operation zone); Offshore Waters (relocation zone)
Hull Material: Steel
Structural Form: Combined framing system
Watertight Transverse Bulkheads: 5 sets
Number of Cargo Holds: 1 set
Main Engine: G8300ZC31B, G8300ZC30B Diesel Engine, 2 sets
Rated Power: 2206kw × 2
Rated Speed: 600r/min
Gearbox Model: GWC52.59-02, GWC52.59-01
Propeller Shaft: Diameter 275mm, 2 sets
Intermediate Shaft: Diameter 240mm, 2 sets
Propeller Type: MAU 5-blade propeller, integral nickel-aluminum bronze (Grade 3)
Propeller Diameter: 3.000m
Propeller Rotation: Outward rotation, 2 sets
Anchor Type: Speke Anchor, 3060kg, 2 sets
Windlass: Bow windlass (YMB2-58), 37kw, 2 sets
Anchor Chain: Diameter 50mm, length 247.5m per side, material M20Mn, total length 495m
Rudder Type: Streamline balanced rudder, 2 sets
Single Rudder Area: 9.44m²
Rudder Stock Diameter: 260mm, material 440# steel
Steering Gear: Electro-hydraulic steering gear (HDYY200), 200kN·m
Steering Time: ≤28s (from 35° one side to 30° the other side)
Main Generator: TFXW-355L6-H, 3 sets
Main Generator Rated Power: 300kw, rated speed 1000r/min, rated voltage 400v
Emergency Generator: TFXW-250M4-H, 1 set
Emergency Generator Rated Power: 90kw, rated speed 1500r/min, rated voltage 400v
Battery Capacity: 400Ah
Main Switchboard Panels: 8 sets
Emergency Power Distribution Panels: 2 sets
Emergency Fire Pump: 80CBZ-65, 60m³/h, 0.6Mpa, 1 set
Main Fire Pump: 100CBZ-65, 80m³/h, 0.7Mpa, 2 sets
Fixed Fire Extinguishing System: CO₂ system, 34 sets, for engine room and pump room
Fire Detectors: Manual type (19 sets), smoke-sensitive type (45 sets), thermally sensitive type (40 sets)
Medium/High Frequency Radio: SRG-1150DN
VHF Radio Telephone: FT-805
Lifeboat Two-Way VHF: FT-2800
Emergency Radio Beacon: EB-10
Navexus Receiver: NTX100B
Fore Peak Tank (Ballast): Approx. 380.80m³
No.1 Ballast Tank (P&S): Approx. 254.12m³
No.2 Ballast Tank (P&S): Approx. 254.12m³
Fresh Water Tank (P&S): Approx. 145.22m³
Reserve Fresh Water Tank (P&S): Approx. 254.12m³
Fuel Oil Tanks (Total): Multiple tanks, large capacity for long endurance
Comply with 2004 Statutory Inspection Rules for Ships and Offshore Facilities (PRC Maritime Safety Administration)
Comply with 2006 Construction Rules for Sea-Going Ships (China Classification Society)
Built in accordance with 2005 China Shipbuilding Quality Standard
Stable Performance: Reasonable hull structure, steady sailing and Dredging, strong adaptability to coastal waters.
High Efficiency: Large hopper capacity, powerful main engine, fast sailing speed, short operation cycle.
Reliable Equipment: Complete supporting systems, stable power supply, qualified safety facilities.
Long Endurance: Large fuel and water storage, suitable for long-distance and continuous operations.
Compliant Design: Built in line with national standards and classification society rules, safe and reliable.
Coastal channel dredging and maintenance
Port waterway construction and renovation
Offshore silt cleaning and seabed leveling
Nearshore engineering and water conservancy projects
Insufficient Pre-dredging Depth / Draft Restrictions
Utilize high tide levels to dredge shallow sections first. Proceed from shallow to deep areas, gradually widening and deepening the channel.
Thick Sediment Layers, Large Volume & Long Duration with Siltation
Dredge shallow sections first and deepen incrementally. Wait until the depth across the trench is relatively uniform before deepening further.
Reason: To allow sedimentation in the deeper sections to be dredged out in a single pass during the later stages.
Unidirectional Current
Start dredging from the upstream end and progress downstream. This utilizes the current to flush away disturbed sediment, enhancing dredging efficiency.
Ebb-Tide Dominated Estuaries
Utilize tidal currents by dredging from the inside (upstream) towards the outside (seaward).
Cross-section: Shallow Sides, Deep Center
Dredge the two sides first.
If one side has a thicker sediment layer: Dredge the thicker side first. Once depths on both sides are similar, deepen the whole section gradually.
Reason: To avoid forming steep slopes that could lead to collapse (landslides).
Flat Topography with Hard Clay
Dredge the entire channel width uniformly, layer by layer.
Reason: To prevent the formation of ridges or furrows (gullies), which would make subsequent leveling difficult.
Uniform Pre-dredging Depth (Center & Sides)
Dredge the sides first, then proceed to the center.
High Siltation & Flow Parallel to Channel Axis
First, dredge a deep pilot trench through the shallow areas to create a path, then gradually widen it.
Reason: To utilize the water flow to scour the trench and reduce the volume of back-siltation.
FAQs:
Answer: This Trailing Suction Hopper Dredger is highly efficient at excavating loose to medium-density materials, including sand, silt, clay, and fine gravel. Equipped with powerful Holland Breeman Dredge Pumps and high-pressure flushing water (150m head), it optimizes suction for these soils. However, like standard TSHDs, it is not designed for hard Rock Dredging without pre-loosening. With a maximum dredging depth of 30 meters, it is ideal for port maintenance, channel deepening, and land Reclamation projects involving soft to medium sediments.
Q2: How does the draghead system on this vessel improve dredging efficiency?
Answer: The vessel features two trailing suction pipes equipped with specialized dragheads (3.0m width). The draghead acts as the critical interface at the end of the suction pipe, serving two main functions: loosening seabed sediments and controlling the mixture intake. Our system supports a 150m high-pressure flushing water supply to the draghead, which actively fluidizes compacted sand or silt, significantly improving suction efficiency and loading rates (approx. 56 minutes for full hopper capacity).
Q3: What is the function of the overflow system, and how does it benefit cargo capacity?
Answer: The overflow system is crucial for maximizing payload. As the 5,586m³ hopper fills, excess water and fine particles are discharged through two large DN1360mm overflow tubes (adjustable stroke 3000mm). This process allows denser soil to settle while removing lighter water, thereby increasing the solid load density (up to 7,260 tons of soil capacity). This ensures the vessel transports more useful material per trip, reducing fuel costs and project duration for land reclamation and beach nourishment tasks.
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