Telescopic Davit

Telescopic Davit is a marine launching appliance designed for the safe launching and recovery of rescue boats, fast rescue boats (FRB), and workboats. The telescopic design allows the davit boom to extend outward during operation, enabling safe clearance from the ship’s side while maintaining a compact stowed position.

The system is designed and manufactured in accordance with SOLAS, LSA Code, and relevant Classification Society rules (DNV, ABS, LR, BV).

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Working Principle

telescopic davit consists of one or more extendable boom sections driven by hydraulic cylinders. During operation:

1. The boom telescopes outward to the operating position

2. The rescue boat is lifted and slewed overboard

3. Controlled lowering is performed using a winch with fail-safe braking systems

4. Recovery is achieved by reversing the sequence under full control

The system ensures smooth motion, precise positioning, and high operational safety even under adverse sea conditions.

Main Components

1. Telescopic Boom Structure

• Multi-stage telescopic steel construction

• Designed for bending, torsion, and fatigue loads

• Internal guide and wear pads for smooth extension

• Corrosion-protected (marine coating or galvanizing)

2. Hydraulic System

• Telescopic cylinder(s) for boom extension

• Slewing cylinder or hydraulic slewing drive

• Power pack (electric motor-driven hydraulic unit)

• Manual emergency pump for blackout conditions

• Pressure relief and counterbalance valves

3. Winch System

• Electric or hydraulic rescue boat winch

• Grooved drum with marine-grade wire rope

• Automatic load-holding brake (fail-safe)

• Overspeed protection (pendulum or centrifugal brake)

4. Slewing System

• Slewing bearing or slewing column

• Hydraulic or electric rotation drive

• Mechanical slewing lock for stowage

5. Control System

• Local control panel (extend / slew / hoist / lower)

• Emergency stop function

• Optional remote control from davit or deck

• Interlocks to prevent unsafe operation sequences

6. Safety Devices

• Limit switches (boom extension, hoisting limits)

• Overload protection via load pin or pressure monitoring

• Slack rope switch

• Emergency lowering system

• Mechanical stoppers and guards

Technical Features

• Compact stowage with extended outreach capability

• High load capacity with optimized structural weight

• Smooth and shock-free operation

• Redundant braking and safety systems

• Low maintenance design

Typical Technical Data (Example)

• Safe Working Load (SWL): 2.5 – 7.5 tons

• Outreach: Up to 6.0 m (telescopic extension)

• Slewing angle: ± 90° or 180°

• Hoisting speed: 18 – 24 m/min

• Lowering speed: Class-compliant controlled speed

• Operating temperature: –20°C to +45°C

Usage and Applications

Primary Applications

• Rescue boat davits

• Fast Rescue Boat (FRB) systems

• Offshore standby vessels

• Naval and coast guard vessels

• Research and survey ships

Operational Purpose

• Rapid and safe launching of rescue boats in emergency situations

• Recovery of boats under dynamic sea conditions

• Ensuring crew safety during man-overboard operations