Dredging Grab

Dredging Grab | High-Efficiency Underwater Material Handling
HENAN HENGKUN CRANE CO., LTD. - MARINE-GRADE EXCAVATION SYSTEMS

Brand: Henan Hengkun Crane Co., Ltd.
Applications: Specialized for underwater dredging operations in rivers, harbors, and coastal areas. Ideal for clearing silt, sand, gravel, and debris during waterway maintenance, port expansion, and flood prevention projects.

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Product Overview
The Dredging Grab is a heavy-duty, high-efficiency tool designed for underwater excavation and sediment removal. Compatible with double-rope or four-rope crane systems (dredgers), it excels in challenging environments such as silt-clogged riverbeds, port channels, and coastal zones. Its reinforced structure and optimized jaw design ensure reliable performance in abrasive and water-saturated conditions, making it indispensable for large-scale dredging and waterway rehabilitation.

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Mission-Critical Underwater Performance

Engineered for extreme dredging operations in harbors, channels, and ports, HENGKUN Grabs deliver:
1. Deep-Sea Integrity
→ Triple-lip seal system (IP68 / 60m depth rating)
→ Pressure-compensated pulley chambers

2. Material-Specific Jaws

Material Type	Jaw Design	Reinforcement
Soft Silt	Wide-profile plates	Wear-resistant liners
Hardpan & Gravel	Interlocking teeth	AR400 steel tips
Rock & Reef	Pyramid teeth clusters	60mm forged alloy pins
Wreckage	Shear-cut edges	Hydraulic penetration

3. Rope Compatibility
◉ Twin-rope ◉ Four-rope crane systems

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Technical Specifications

Model	DG-5m³	DG-8m³	DG-11m³
Capacity	20T	45T	80T
Bucket Width	1820mm	2102mm	2420mm
Rate	4	6	7
Cycle Time	45-60 sec	60-75 sec	75-90 sec
Weight	8.2T	28T	55T

Core Standards
▸ Structural: ISO 9001/EN 12079
▸ Safety: EN 13852-1 + DNV-GL certification
▸ Corrosion: ISO 9224 Class C5

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Case Study: Dubai Ports Authority, UAE

Challenge
Remove 2.4M m³ hardened seabed sediment at 35m depth

Solution

• 8× DG-50T Grabs with:
  → Tungsten carbide tooth inserts
  → Anti-twist quad-rope configuration

Result
▸ 40% faster cycle time vs conventional grabs
▸ Zero seal failure in 18-month operation
▸ 98.6% material retention rate

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Durability Engineering

Component	Technology	Service Life
Jaw Structure	Hardox 500 + SSAB Strenx 700	12,000+ cycles
Pivot Mechanism	Sealed spherical bearings	24,000h
Sheave Assembly	Forged 42CrMo4 steel	Lifetime lubed
Control Valves	Nickel-aluminum bronze	Corrosion-free

Global Compliance

◈ ABS ◈ DNV ◈ Lloyd's Register ◈ Bureau Veritas

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Service & Certifications

• Global Compliance: CE, ISO, and marine engineering standards.

• Installation: Technical support for crane/dredger synchronization.

• Warranty: 12–18 months (extendable) with corrosion resistance guarantees.

• Maintenance: Underwater operation guides and OEM replacement parts.

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Why Choose Us?

• Proven Expertise: Decades of experience in dredging equipment manufacturing.

• Tailored Solutions: Custom grabs for unique waterway challenges.

• Quality Assurance: Rigorous pressure and fatigue testing.

• Global Support: Rapid delivery to ports and project sites worldwide.

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Request a Custom Quote → Optimize your dredging efficiency with precision-engineered grabs!