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Suspended davit system for rescue boat SWL 1.5t (Technical supply specification)


1. General

The suspended rescue boat davit remains fully operational under the following conditions:

  • Permanent heel, either port or starboard: up to 20°
  • Permanent trim, either bow or stern: up to 10°
  • Rolling with amplitude (3% probability of exceedance) up to 4.0° and average period of 11.1 s
  • Pitching with amplitude (3% probability of exceedance) up to 2.0° and average period of 7.7 s
  • Heaving with amplitude (3% probability of exceedance) up to 1.3 m and average period of 8.8 s
  • Ambient air temperature: from –30 °C to +45 °C

2. Purpose

Designed for the launch and recovery of an inflatable rescue boat with a seating capacity of up to 6 persons.

Suspended rescue boat davit SWL 1.5 t general arrangement drawing side view
Suspended rescue boat davit SWL 1.5 t general arrangement drawing side view

About

Suspended rescue boat davit: mechanical safety

Every vessel carries equipment required to operate flawlessly at any given second, even during catastrophic events. A rescue boat davit falls directly into this equipment category. Telescopic davits represent a specific class of equipment combining engineering accuracy, marine environment resistance, and readiness for operations in the harshest conditions.

Telescopic design rationale

Space constraints make footprint reduction crucial. A telescopic configuration ensures a compact stowed position, saving deck space while maintaining full capability to launch the boat from high freeboards. This is highly relevant for multi-tier decks and vessels where the rescue boat is located high above the waterline.

Furthermore, the telescopic system minimizes protruding components, reducing collision risks during heavy rolling or port maneuvers.

Operations in extreme sea states

The telescopic davit is designed for operations during heavy rolling, high winds, icing, and extreme temperature variations. The design ensures structural integrity and enables the launch and recovery of a fully manned boat at vessel speeds up to 5 knots and sea states up to code 5.

The system features dynamic compensation elements: winches maintain continuous tension on the wire ropes, and the control system reduces speed as the boat approaches its upper or lower travel limits. This protects both the equipment and the personnel.

Simple control backed by advanced technology

The control panel may feature only a single lever or push-button, yet it triggers dozens of engineered solutions. Mechanisms operate from both the main vessel grid and the emergency power supply. In the event of a total power blackout, a gravity-based or manual emergency mode ensures safe and controlled lowering of the rescue boat without risk to the crew.

Select davit models feature automatic braking systems and real-time boat position tracking. This creates an integrated system where every component serves a single purpose: ensuring the safe, controlled evacuation of personnel in critical situations.

Beyond a standard winch

To a non-technical observer, a davit might resemble a standard lifting device. In reality, it is a critical life-saving appliance where every detail—from the hydraulic oil grade to the control panel label language—directly influences the outcome of an emergency.

Modern davit systems must fully comply with the International Convention for the Safety of Life at Sea (SOLAS) and the rules of classification societies such as the Russian Maritime Register of Shipping (RMRS).

Domestic solutions driving fleet independence

Izhora Hydrosystems LLC designs and manufactures telescopic rescue boat davits certified in accordance with RMRS requirements. We deliver equipment that goes beyond basic technical compliance, incorporating real-world maritime operational experience tailored for the Russian fleet.

When engineering our davit systems, we focus on maximum reliability, intuitive operation, and environmental resilience. When seconds count, absolute confidence in every component—from the telescopic boom structure to the winch braking sequence—is paramount.


3. Scope of supply

3.1 Suspended rescue boat davit

3.1.1 System configuration

ComponentQuantity
Telescopic davit assembly1
Bow boom1
Hydraulic equipment (hydraulic power unit, control valves, etc.)1 set
Control cabinet with integrated control panel1
Fixed control station for rescue boat davit1
Portable control pendant for rescue boat davit1
Spare parts, tools, and accessories (STCW / SPI)1 set
Cable set (excluding external connection cables)1 set
Suspended rescue boat davit SWL 1.5 t general arrangement drawing top view
Suspended rescue boat davit SWL 1.5 t general arrangement drawing top view

3.1.2 Main parameters

ParameterValue
Davit typeTelescopic
Safe Working Load (SWL)15 kN
Lowering height20 m
Lowering speed0.6 m/s
Recovery speed0.4 m/s
Holding rope tension30 kN
Davit weight (including winch)4750 kg
Installed power18.5 kW
Maximum hydraulic operating pressure160 bar
Hydraulic fluidAUP TU 38.1011258-8

3.1.3  Spare parts, tools, and accessories (SPI)

  • Standard manufacturer’s spare parts kit for 1 year of operation — 1 set

3.1.4 Documentation

DocumentQuantity
Technical passport1
Installation and operation manual1
Onboard testing program and procedure1
Factory acceptance test (FAT) report1

3.1.5 Certificates

  • RMRS Certificate (RS Certificate) according to form 6.5.30 — 1 copy

4. Additional requirements

  • The suspended rescue boat davit is equipped with a quick-release hook.
  • Manned boat lowering complies fully with SOLAS requirements.
  • Manned boat recovery is ensured at sea states up to code 5 inclusive.
  • Launch and recovery operations are possible at vessel speeds up to 5 knots in calm water.
  • Launch and recovery are executed via a single-point suspension system.
  • The davit complies with RMRS rules for rescue boat launching appliances.
  • Control is available from both the fixed control station and the portable control pendant.
  • Hoisting/lowering speed is controlled proportionally by the lever 
  • deflection angle on the fixed station.
  • Proportional speed control is identically implemented on the portable control pendant.
  • Automatic switch-to-low-speed function triggers when approaching the boom tip.
  • Automatic stop triggers upon reaching the upper travel limit.
  • The winch features a wave compensation system (tension-holding mode).
  • The bow boom is equipped with a hydraulic stopper.
  • Anti-condensation heating is integrated into the equipment.
  • Illumination is provided for the launch and recovery operation zone.
  • All labels and diagrams are executed in Russian.
  • The final coating system layer is subject to approval by the vessel designer.
  • Power supply parameters:
    • Main power supply: 380 V, 3-phase, 50 Hz AC (without neutral).
    • Internal circuits provide power to all auxiliary systems differing from the main supply voltage.
    • Input electrical power quality complies with RMRS requirements.
    • Automatic transfer from main to emergency grid triggers upon voltage loss or drop.
    • Automatic re-transfer triggers upon main voltage restoration.
    • Emergency gravity lowering and stowing are ensured upon total loss of power.
    • Hoisting mechanisms are equipped with fail-safe, normally-closed brakes.

5. Manufacturer

Izhora Hydrosystems LLC


6. Warranty period

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


Contacts

  • Phone: +7 (812) 339-61-68
  • Email: contact@i-hydro.tech