List of Deck Machinery for ASD Tugboats (Specifications and Layout Points)
This list is applicable to standard ASD Tugboats (Azimuth Stern Drive Tugboats), covering five core categories of deck machinery: towing equipment, anchoring equipment, mooring equipment, auxiliary operation machinery, and fire-fighting equipment. It specifies the specifications, layout positions and core points of each equipment。
I. Towing Equipment (Core Operation Category, Concentrated at the Stern)
Equipment Name | Specifications and Parameters | Layout Points | Core Functions |
Main Towing Winch | 1. Drive Mode: Hydraulic drive; 2. Rated Pull: 200–500kN; 3. Drum Configuration: Main cable drum + standby cable drum; 4. Auxiliary Functions: Constant tension control, automatic cable arrangement, emergency release, overload protection; 5. Steering Adaptation: Compatible with full 360° rotation operation, preventing cable entanglement | 1. Arranged in the central area of the stern deck, close to the poop; 2. The drum axis is parallel to the longitudinal direction of the hull to ensure uniform force on the towing cable; 3. Reserve operating space around and equip with guardrails; 4. Arrange in a straight line with the bollard and fairlead to reduce cable turning friction | Provide constant towing pull and retract/extend the main towing cable; complete core operations such as pushing/towing large ships during berthing/unberthing, ocean towing, and emergency rescue |
Auxiliary Towing/Mooring Winch | 1. Drive Mode: Hydraulic/electric; 2. Rated Pull: 80–150kN; 3. Drum Specification: Suitable for Φ24–Φ32mm cables; 4. Control Mode: Manual + remote control dual mode | 1. Arranged symmetrically on both sides of the main towing winch; 2. Close to the stern fairlead for quick cable guiding; 3. The body is firmly fixed with reserved maintenance space | Retract/extend auxiliary towing cables and mooring cables; assist in hull positioning and cable handling, and cooperate with the main towing winch to complete multi-cable coordinated operations |
Towing Bollard (Double-post/Single-post) | 1. Material: High-strength alloy steel; 2. Rated Load: Not less than the maximum pull of the main towing winch (500–800kN); 3. Structure: Double-post (preferred), column diameter Φ120–Φ150mm, height 800–1000mm | 1. Arranged directly behind the main towing winch, at the edge of the stern deck; 2. Aligned with the center line of the fairlead and main towing winch; 3. The bottom is welded to the strong structure of the deck with anti-corrosion treatment | Fix the main towing cable and bear the maximum towing pull; protect the main towing winch to avoid direct cable force on the winch body |
Fairlead (Roller/Roller/Clamp Type) | 1. Material: Wear-resistant alloy steel with surface quenching treatment; 2. Roller Diameter: Φ150–Φ200mm; 3. Suitable Cable Diameter: Φ32–Φ56mm; 4. Bearing Capacity: Not less than 300kN | 1. Arranged in front of the towing bollard, at the outlet of the main towing winch, and at the edges of both sides of the stern; 2. The roller axis is perpendicular to the cable force direction to reduce friction; 3. Firmly fixed to prevent displacement during operation | Guide the direction of towing cables and mooring cables; reduce friction between cables and the deck/equipment, prevent cable wear and derailment, and adapt to multi-directional force of full rotation |
Shark Jaw (Towing Cable Retaining Device) | 1. Type: Fork type/connecting rod type (choose one); 2. Drive Mode: Hydraulic/electric/manual; 3. Rated Load: 100–800kN (adapt to main towing cable pull); 4. Suitable Cable Diameter: Φ24–Φ56mm; 5. Function: Equipped with emergency release device, complying with GB/T XXXXX—XXXX/ISO 24041:2020 standard requirements | 1. Arranged between the stern main towing winch and the towing bollard, symmetrically distributed on both sides of the towing pin center line (left-hand/right-hand type); 2. Aligned with the cable force direction and fixed to the strong structure of the deck; 3. Reserve operating space around and do a good job in anti-corrosion and waterproof treatment | Temporarily retain the deck towing cable and chain rigging and bear the load, assisting the towing bollard to fix the cable; cooperate with the main towing winch to complete cable positioning and emergency fixing, and realize load release in emergency situations |

II. Anchoring Equipment (Berthing and Positioning Category, Concentrated at the Bow)
Equipment Name | Specifications and Parameters | Layout Points | Core Functions |
Windlass (Combined Anchoring and Mooring Machine) | 1. Drive Mode: Hydraulic/electric; 2. Anchoring Speed: 8–12m/min; 3. Rated Mooring Pull: 100–200kN; 4. Suitable Anchor Chain: Φ22–Φ30mm, length 200–300m; 5. Configuration: Anchor chain wheel, mooring drum, clutch, braking system | 1. Arranged on the bow deck, directly behind the hawse pipe; 2. The body is aligned with the longitudinal axis of the hull; 3. Equip with protective devices around to avoid injury from anchor chain bouncing; 4. Close to the anchor chain compartment entrance for convenient anchor chain storage | Integrated anchoring, dropping anchor and bow mooring; retract/extend the anchor chain to fix the ship position, and retract/extend the bow cable at the same time to complete port mooring, temporary anchoring and emergency anchoring positioning |
Anchor, Anchor Chain, Hawse Pipe/Chain Locker | 1. Anchor Type: Hall anchor/Spade anchor, weight 2000–5000kg; 2. Anchor Chain: Grade C, Φ22–Φ30mm, pitch 180–220mm, total length 200–300m; 3. Hawse Pipe: Diameter Φ100–Φ150mm, length suitable for anchor storage; 4. Chain Locker: Volume ≥1.5m³, with anti-surging plate | 1. Anchor: Arranged in the bow anchor recess, aligned with the hawse pipe; 2. Hawse Pipe: Penetrates the bow deck and hull, with wear-resistant bushing at the outlet; 3. Chain Locker: Located below the windlass, connected to the hawse pipe, with waterproof and anti-corrosion treatment | The anchor provides seabed grip to fix the hull; the anchor chain connects the anchor and the windlass to buffer wind and wave impact; the hawse pipe guides the anchor retraction and extension, and the chain locker stores the anchor chain |
III. Mooring Equipment (Berthing and Fixing Category, Distributed Throughout the Boat)
Equipment Name | Specifications and Parameters | Layout Points | Core Functions |
Mooring Winch/Capstan | 1. Drive Mode: Hydraulic/electric; 2. Rated Pull: 60–120kN; 3. Drum Specification: Suitable for Φ20–Φ28mm mooring cables; 4. Function: Constant tension control, manual emergency operation available | 1. Bow: 1–2 units supplementary arranged beside the windlass; 2. Midship: Symmetrically arranged on both sides of the deck, 1 unit each; 3. Stern: Arranged beside the auxiliary towing winch, corresponding to the mooring bollard; 4. The body is fixed on the deck strong beam with reserved operating space | Retract/extend mooring cables to fix the ship to the wharf/buoy; cooperate with the towing winch to complete cable handling and unmooring during berthing/unberthing, ensuring berthing stability |
Mooring Bollard (Bow, Midship, Stern) | 1. Material: High-strength alloy steel; 2. Rated Load: Bow 80–150kN, Midship 60–100kN, Stern 100–180kN; 3. Structure: Double-post/goat's horn type, column diameter Φ100–Φ120mm | 1. Bow: 2 units symmetrically arranged on the edge of the deck, in front of the windlass; 2. Midship: 2–3 units on each side of the deck, spacing 3–5m; 3. Stern: 2 units symmetrically arranged on both sides of the towing bollard; 4. All mooring bollards correspond to the fairlead positions for convenient cable fixing | Fix mooring cables and bear mooring pull; adapt to multi-directional mooring needs of the whole ship, ensuring the stability of the ship during berthing |
Hawse Hole, Roller Fairlead, Cable Stopper | 1. Hawse Hole: Diameter Φ80–Φ120mm, wear-resistant material; 2. Roller Fairlead: Roller diameter Φ120–Φ180mm, bearing capacity ≥150kN; 3. Cable Stopper: Suitable for Φ20–Φ32mm cables, rated load ≥80kN | 1. Hawse Hole: Arranged on the edge of the deck, corresponding to the mooring bollard position; 2. Roller Fairlead: Arranged between the mooring winch and the mooring bollard to reduce cable friction; 3. Cable Stopper: Close to the mooring bollard, arranged in a straight line with the fairlead and mooring winch | The fairlead guides the direction of the mooring cable and reduces wear; the cable stopper temporarily fixes the cable and releases tension, protecting the mooring winch and preventing cable slipping |

IV. Auxiliary Operation Machinery (Maintenance and Loading/Unloading Category, Arranged as Needed)
Equipment Name | Specifications and Parameters | Layout Points | Core Functions |
Marine Crane (Knuckle Boom/Straight Boom) | 1. Type: Hydraulic knuckle boom crane (preferred, space-saving); 2. Rated Lifting Capacity: 2–5t; 3. Working Range: 3–8m; 4. Control Mode: Manual + remote control, 360° rotation available | 1. Arranged in the midship or stern of the deck, avoiding the operation area of towing and mooring equipment; 2. The body is fixed to the strong structure of the deck with foundation reinforcement treatment; 3. The working radius covers the entire deck for convenient material transfer | Hoist spare parts, cables, life-saving equipment and fire-fighting equipment; complete deck equipment maintenance, material loading/unloading and marine emergency rescue operations |
Standby Cable Reel | 1. Material: Carbon steel + anti-corrosion coating; 2. Drum Diameter: Φ500–Φ800mm, length 1000–1500mm; 3. Suitable Cable Diameter: Φ24–Φ56mm, cable storage length 100–200m | 1. Arranged in a dedicated cabin under the main deck or a corner of the stern deck; 2. Close to the main towing winch and mooring winch for quick cable replacement; 3. The reel is firmly fixed with a locking device to prevent drum rotation | Store standby towing cables and mooring cables; facilitate cable maintenance and replacement, ensure operation continuity, and respond to emergency situations of cable damage |
Capstan (Manual/Hydraulic) | 1. Type: Manual/hydraulic dual mode; 2. Rated Pull: 30–60kN; 3. Suitable Cable Diameter: Φ16–Φ24mm; 4. Drum Length: 300–500mm | 1. Arranged in narrow areas of the deck (such as beside the bow anchor recess, stern corner); 2. Close to the operation point for convenient manual operation; 3. The body is small and fixed on the deck bracket, not occupying core operation space | Light mooring, auxiliary retraction/extension of small-diameter cables; temporary traction of light equipment and materials, used in narrow spaces or emergency operations |
V. Fire-Fighting Deck Equipment (Emergency Fire-Fighting Category, Distributed Throughout the Boat)
Equipment Name | Specifications and Parameters | Layout Points | Core Functions |
Fire Water Monitor/Foam Monitor | 1. Type: Remote-controlled fire monitor; 2. Jet Medium: High-pressure water/foam (switchable); 3. Jet Range: 80–150m; 4. Jet Flow Rate: 50–120m³/h; 5. Adaptation Standard: FIFI I/II level fire-fighting requirements; 6. Control: 360° rotation, pitch adjustment, manual + remote control | 1. Arranged at high points of the bow, stern and midship of the deck (such as the top of the wheelhouse, poop deck); 2. The jet range covers the entire ship and surrounding areas; 3. Firmly fixed with a protective cover, with waterproof and anti-corrosion treatment | Jet high-pressure water or foam to perform external fire-fighting and marine fire-extinguishing operations; cool the hull and towed ships to respond to fire emergencies |
Fire Hose Reel | 1. Hose Specification: Φ50–Φ65mm, length 20–30m; 2. Working Pressure: 1.0–1.6MPa; 3. Configuration: Equipped with quick connector and water gun, manually deployable | 1. Arranged on both sides of the deck, beside the wheelhouse, at the engine room entrance and near the fire control station; 2. The spacing is not more than 15m to ensure full deck coverage; 3. Fixed on the bracket for quick access, with moisture-proof treatment | Provide short-range fire water; used for initial fire extinguishing on the deck and cabins, supplementing the short-range operation blind area of the fire monitor |
VI. Summary of Core Configuration (Standard ASD Tugboat)
• Bow Area: 1 unit of windlass (combined type) + anchor chain system (1–2 anchors, 200–300m anchor chain) + 2 bow mooring bollards + 2–3 sets of fairleads/hawse holes
• Stern Area: 1 unit of main towing winch + 2 units of auxiliary towing/mooring winches + 1–2 towing bollards + 2–3 sets of roller fairleads + 1–2 shark jaws (symmetrically arranged)
• Whole Ship Distribution: 4–6 mooring winches/capstans + 6–8 mooring bollards + several fairleads/cable stoppers + 1 knuckle boom crane + 1 standby cable reel + 2–3 fire monitors + 4–6 fire hose reels + 1–2 shark jaws (stern-specific)
• General Requirements: All equipment shall comply with marine industry standards, be properly anti-corroded and waterproofed, be equipped with emergency operation devices, and be regularly maintained and calibrated,

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