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A-frame davit for fast rescue boat, SWL 20 kN (Technical supply specification)


1. General Information (Operating Conditions)

The A-frame davit operates reliably under the following ambient conditions:

Design ambient air temperature: +35 °C at 80% relative humidity in summer; -30 °C at wind speeds up to 25 m/s and 85% relative humidity in winter. Water temperature: from +32 °C to -2 °C respectively.


2. Purpose

The A-frame davit is designed for stowing, launching, and recovering a fast rescue boat with its full complement of equipment.

A-frame davit, SWL 20 kN – General arrangement drawing, side view.
A-frame davit, SWL 20 kN – General arrangement drawing, side view.

About

Boat Davits and Launch and Recovery Systems: Advanced Marine Technology

Launch and recovery systems (LARS) and davits play a critical role in the maritime industry, ensuring safe and efficient launch and recovery of boats from the vessel. They optimize operational workflows, reduce crew workload, and maintain equipment integrity. These systems are widely utilized for small and fast rescue boats, enabling prompt mission execution in all sea states and enhancing overall safety on board.

Operating Principle and Control System

Modern launch and recovery systems utilize hydraulic or electro-hydraulic drive systems that provide stepless speed control during launch and recovery. The systems are equipped with both fixed control stations and remote control pendants, offering operational flexibility and crew convenience. These control configurations adapt to various operational scenarios, ensure rapid response to changing conditions, and minimize the risk of equipment damage.

Structural Reliability and Durability

Launch and recovery systems are engineered from high-strength, corrosion-resistant materials capable of withstanding prolonged exposure and heavy heavy duty cycles. Optimised structural frames and sheave blocks ensure high reliability, reduce maintenance requirements, and guarantee continuous operation under severe duty conditions. Structural longevity and high mechanical impact resistance make these systems essential for regular maritime operations.

A-Frame LARS: Advanced Technical Solution

The A-frame LARS developed by Izhora Hydrosystems LLC represents a premier solution in the current market. This system delivers a proven combination of structural reliability, precise control, and operational versatility. The A-frame LARS seamlessly integrates with various boat designs to optimize launch and recovery workflows, significantly increasing crew efficiency while ensuring safe and predictable marine operations.

Application of Launch and Recovery Systems in Marine Operations

Launch and recovery systems, including A-frame davits, are utilized across a wide range of marine operations, spanning boat transit, search and rescue (SAR) missions, and offshore deployment. Implementing these systems substantially enhances operational efficiency, safeguards small craft from damage, and optimizes maritime task execution. Selecting the correct system configuration is critical to ensuring the successful and safe operation of small marine vessels.


3. Scope of Supply

3.1 A-frame LARS 20 kN for fast rescue boat

3.1.1 Product Structure

ComponentQuantity
Wire rope with suspension assembly1 set
Access ladder1 pc
Pipework installation (set of pipes, hoses, and fittings installed on the A-frame)1 set
Control cable installation (set of control cables installed on the A-frame)1 set
Sheave block assembly (set of sheaves installed on the A-frame)1 set
Boom assembly1 set
Subframe1 set
Frame1 set
Hydraulic cylinders1 set
Damper1 pc
Keel blocks1 set
Accumulator unit (pneu-hydraulic)1 set
Linkage rods1 set
Winch1 pc
Hydraulic power unit (HPU) with control cabinet1 set
Spare parts, tools, and accessories (SPTA) kit1 set
Remote control pendant with 10 m cable1 pc
Local control station1 pc
A-frame LARS, SWL 20 kN – General arrangement drawing, top view.
A-frame LARS, SWL 20 kN – General arrangement drawing, top view.

3.1.2 Main Parameters

ParameterValue
Safe Working Load (SWL)20 kN
Lowering speed18 m/min
Hoisting speed10 m/min
Wire rope diameter according to GOST 7669-8016 mm
Number of suspension points1 pc
Maximum lifting height25 m
Shipboard power supply3 ph / 380 V AC / 50 Hz
Actuator drive typeHydraulic
Emergency hoistingVia manual handwheel
Emergency frame luffingVia manual hydraulic pump
Estimated LARS weight (excluding HPU and ladder)3500 kg
HPU weight (excluding hydraulic fluid)700 kg
HPU electric motor rated outputApprox. 18.5 kW
Control systemLocal control station and remote control pendant with 10 m cable
Vessel heel / trim20° / 10°
Time between overhauls (TBO)8 years
Design life15 years

3.1.3 SPTA Kit

Manufacturer’s standard for 1-year operation — 1 set.

3.1.4 Documentation

DesignationQuantity
Product data sheet (Passport)1
Installation, commissioning, and adjustment instructions1
Operating manual1
Shipboard test program and procedure1
Factory acceptance test (FAT) report1
SPTA list1

3.1.5 Certificates

RMRS Certificate (RS Certificate) as per Form 6.5.30 and State Technical Supervision (Gostekhnadzor) certificate — 1 copy.

3.2. Fast Rescue Boat

3.2.1 Product Structure

ComponentQuantity
Fast rescue boat assembly, comprising:1 pc
All-welded aluminium hull1 set
5-compartment inflatable PVC collar1 set
24-litre fuel tank2 pcs
Outboard motor1 pc
Thwart3 pcs
Outer lifelines2 sets
30 m painter with painter release hook1 pc
50 m buoyant towing line1 pc
Sea anchor with tripping line and hawser1 pc
Compass with luminous card (backlight) and mounting binnacle1 pc
Foot bellows with connection hose1 pc
Synthetic sling with shackle1 set
Signaling light1 pc
Buoyant oar2 pcs
Boat hook (safe design)1 pc
Buoyant bailer1 pc
Bucket1 pc
Buoyant knife (safe design)1 pc
Sponge2 pcs
Buoyant rescue quoit with 30 m buoyant line2 pcs
Waterproof electric torch with spare batteries and bulb1 pc
Whistle1 pc
First-aid kit in waterproof packaging1 pc
FOS-3 searchlight1 pc
Thermal protective aid (TPA)2 pcs
Radar reflector1 pc
Fire extinguisher1 pc
Dry bag for equipment storage1 pc
PVC collar repair kit in container1 pc
Retro-reflective tapes for collar5 pcs
Outboard motor SPTA kit1 set
Deck cradles1 set
Ratchet lashing strap (gripes for securing the boat to the LARS)2 pcs
Deck tie-down lashing strap3 pcs
Boat storage cover1 pc
Portable searchlight with battery pack and charger1 set
Battery pack, 6 V, 9 Ah1 pc
Battery charger, 220 V AC1 pc
A-frame LARS, SWL 20 kN – General arrangement drawing, front view.
A-frame LARS, SWL 20 kN – General arrangement drawing, front view.

3.2.2 Main Parameters

ParameterValue
Length overall (LOA), mm6800 ± 100
Cockpit length, mm4880 ± 50
Beam overall (BOA), mm2500 ± 50
Cockpit beam at midships, mm1500 ± 50
Maximum moulded depth, mm1150 ± 50
Moulded depth at midships, mm900 ± 20
Collar diameter at midships, mm500 ± 10
Collar diameter at bow, mm350 ± 10
Number of watertight collar compartments5
Maximum carrying capacity, max, kg1000
Seating capacity, persons8
Engine output, hp120–200
Launching weight including 2 crew members, kg1400 ± 10
Full displacement, max, t2
Lightship displacement, t1.2
Speed at full displacement, min, knots25
Cruising range at full displacement, nautical miles100 ± 10
Endurance at full displacement, hours4 ± 0.5
Hull draft (lightship), mm400 ± 10
Hull draft (full displacement), mm440 ± 10
Overall draft (lightship), mm860 ± 10
Overall draft (full displacement), mm880 ± 10
Seakeeping capability, max, sea state4
Total inflatable collar volume, m³2.3 ± 0.1
Nominal (working) collar compartment pressure, kPa18 ± 1

4. Additional Requirements

The A-frame LARS complies with the “General Regulations for Technical Supervision” of the Rules of the Russian Maritime Register of Shipping (RS) and is delivered with the relevant documentation.

The equipment is delivered with RS documentation certifying capability for operation at ambient temperatures down to -30 °C without supplementary heating.

Electromagnetic compatibility (EMC) with other shipboard equipment complies with the RS Rules.

Auxiliary power supply for electrical equipment (control panels, heaters) is 230 V, 50 Hz. Ingress protection rating for the open deck is IP56.

Power supply cables are provided with mating connectors.

All electrical equipment is fitted with external grounding bolts and cable glands.

All equipment is delivered complete with all necessary fasteners (bolts, nuts, washers, etc.).

The scope of supply includes mating connections (counterflanges) for shipboard piping systems.

Instruction and marking plates are in Russian.

The equipment is delivered in packaging that enables handling by both crane and forklift, road transport, and storage in outdoor sheltered areas.

The equipment is offered in the manufacturer’s standard coating system; however, the coating system is subject to approval by the shipyard in all cases.

Preservative coatings ensure an indoor shelf life of 12–18 months.

Launch and recovery system for the fast rescue boat (A-frame LARS):

  • LARS type: Hydraulic A-frame
  • Main power supply: 380 V, 50 Hz
  • Power source: Shipboard mains
  • The A-frame LARS for the fast rescue boat operates from the electro-hydraulic power unit under normal conditions, as well as under dead-ship conditions in accordance with requirements for rescue boats
  • The electro-hydraulic power unit is integrated into the LARS structure
  • The scope of supply for the fast rescue boat launch and recovery system includes all equipment necessary for its intended operation

The Supplier shall develop and obtain RS approval for all documentation required by the RS Rules.

Spare parts, tools, and accessories (SPTA) shall be delivered with the equipment in a scope not less than required by the RMRS Rules.

The SPTA scope shall ensure 1 year of operation. SPTA items shall be appropriately marked and documented in Russian.

The SPTA kit is split into onboard and shore-based parts.

The package dimensions of the onboard SPTA shall enable handling through shipboard hatches measuring 594×594 mm (with a 150 mm corner radius) and storage on racks. The weight of an individual package shall not exceed 50 kg for the onboard SPTA, and 80 kg for the shore-based SPTA, except when packaging non-separable parts or delivering SPTA in racks (cabinets).

The onboard and shore-based parts of the SPTA kit shall be packaged separately.

The following certificates and statements shall be provided with the equipment in 1 (one) hard copy in Russian and English, and in electronic .pdf format:

  • A set of RS Certificates for all delivered equipment in a scope complying with the RS Rules. The certificate types shall correspond to Appendix 1 of Part I “Rules for Technical Supervision during Construction of Ships and Manufacture of Materials and Products for Ships” of the Russian Maritime Register of Shipping.
  • Material Declaration (MD) and Supplier’s Declaration of Conformity (SDoC) prepared in accordance with Sections 6 and 7 of the “Guidelines for the Development of the Inventory of Hazardous Materials” (Resolution MEPC.269(68), Appendix 17). The MD and SDoC shall be issued by completing the forms provided in Appendix 6 and 7 of the Guidelines. The MD and SDoC shall be provided in Russian and English in 4 (four) hard copies, as well as in electronic editable format (.doc or .xlsx) and in .pdf format.

5. Manufacturer

Izhora Hydrosystems LLC


6. Warranty Period

12 months from the delivery date, unless otherwise specified in the contract.


Contacts

Phone: +7 (812) 339-61-68

Email: contact@i-hydro.tech