Ship Tunnel Thruster

Ship Tunnel Thruster

The Marine Electric Combined Anchor Windlass and Mooring Winch (DMA Series) is a versatile, high-performance deck machinery system designed for raising and lowering anchors via anchor chain while also providing mooring line handling capability. Typically installed on the main deck of the stem or poop deck, these combined units optimize deck space by integrating two essential functions into a single, compact machine.

Dual-Function Efficiency

This combined unit serves two critical vessel operations:

By combining these functions, the DMA series offers:

• Reduced deck space requirements – one machine instead of two

• Lower installation costs – single foundation, single power supply

• Simplified maintenance – common parts and service access

• Cost-effective operation – shared drive system

• Improved vessel layout – optimized deck arrangement

Flexible Drive Options

The DMA series is available with either:

• Electric Motor Drive: Clean, quiet operation with precise electrical control

• Hydraulic Motor Drive: High torque density, smooth operation, excellent controllability

Comprehensive Control Systems

Both local control and remote control systems are available, allowing operation from:

• Direct local controls at the windlass

• Remote stations on the bridge or deck

• Integrated vessel control systems

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Key Features & Benefits

• ✅ Combined Functionality: Anchor windlass and mooring winch in a single unit saves deck space.

• ✅ Electric or Hydraulic Drive: Flexible power options to match vessel systems.

• ✅ Single Drum, Single Gypsy, Warping End: Standard configuration with options for double gypsy/drum/warping end.

• ✅ Global Certification: Approved by major classification societies – ABS, DNV, BV, NK, RINA, BKI.

• ✅ Comprehensive Chain Size Range: From 46mm to 84mm chain diameter (AM2 & AM3 grades).

• ✅ Mooring Capability: Integrated mooring winch function with cable capacity up to φ36×300m.

• ✅ Robust Construction: Built for continuous marine service in harsh environments.

• ✅ Reliable Performance: Proven design with decades of service experience.

• ✅ Custom Configurations: Various structure types available to meet specific requirements.

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Technical Specifications – DMA Series

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Configuration Options

Standard Configuration

• Single Drum: For anchor chain handling

• Single Gypsy: For anchor chain engagement

• Warping End: For mooring line handling

Optional Configurations

• Double Gypsy: For vessels requiring two anchor chains

• Double Drum: Enhanced capacity or redundancy

• Double Warping End: Increased mooring capability

• Combined Variations: Various configurations to suit specific vessel requirements

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Applications

The DMA Series Combined Anchor Windlass and Mooring Winch is essential for a wide range of vessels:

Vessel Types

• Commercial Vessels: Cargo ships, container vessels, bulk carriers, tankers

• Offshore Vessels: Supply vessels, anchor handlers, platform support

• Passenger Vessels: Ferries, cruise ships

• Workboats: Tugs, construction vessels

• Naval Vessels: Support ships, auxiliary vessels

Chain Sizes by Vessel Type

• DMA-46 to 50: Small to medium commercial vessels

• DMA-52 to 60: Medium to large commercial vessels

• DMA-62 to 70: Large commercial vessels, bulk carriers

• DMA-73 to 84: Very large vessels, VLCCs, bulk carriers

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Frequently Asked Questions (FAQs)

Q1: What is the difference between an anchor windlass and a mooring winch?
A: While both handle lines, they serve different primary functions:

A combined unit integrates both functions, providing:

• Space savings on deck

• Shared drive system

• Cost-effective solution

• Simplified maintenance

Q2: What do AM2 and AM3 chain grades mean in the specifications?
A: These refer to anchor chain grades per classification society rules:

In the specifications:

• Working Load (kN): Higher for AM3 than AM2 for same diameter

• Over Load (kN): Proof load values, higher for AM3

• Support Load (kN): Maximum holding capacity, higher for AM3

Selection:

• AM2 for standard applications

• AM3 for higher strength requirements or where weight saving is important

Q3: What is the difference between working load, over load, and support load?
A: These terms define different load conditions:

Relationship:

• Over Load ≈ 1.5 × Working Load

• Support Load ≈ 5-6 × Working Load

Safety margins:

• Working load for normal use

• Over load for testing and occasional peak

• Support load ensures structural integrity under extreme conditions

Q4: What does “Nominal Speed (m/min)” refer to for anchor and mooring operations?
A: Nominal speed indicates line speed under specified load:

Anchor speed (9 m/min):

• Consistent across all models

• Optimized for safe anchor handling

• Allows controlled retrieval

Mooring drum speed (e.g., 60/75):

• Higher speed for lighter loads

• Lower speed for heavier pulls

• Two speeds shown (e.g., 60 m/min at higher load, 75 m/min at lower load)

Q5: What does “Cable Capacity” (e.g., φ24×200) mean?
A: This specifies the mooring line storage capacity:

Considerations:

• Using larger diameter reduces available length

• Multiple layers may be required for long lengths

• Rope construction affects actual capacity

• Allow margin for operational needs

Q6: What certifications are available for DMA series windlasses?
A: DMA series windlasses are approved by all major classification societies:

Certification includes:

• Design approval based on class rules

• Material certificates (EN 10204 3.1/3.2)

• Dimensional inspection reports

• NDT (Non-Destructive Testing) reports

• Load testing certificates

• Final inspection documentation

Attention please: The description was copied from different cooperating manufacturers. The description may be different with the goods, please check with us when order.

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