Navigation
Related

Marine A-type Launch and Recovery System for rescue craft with a capacity of up to 25 persons

Izhora Hydrosystems LLC presents a marine A-type Launch and Recovery System (LARS) of A-frame configuration, equipped with hydraulic and electrical systems. The system is designed for the launching and recovery from water of a non-high-speed rescue boat with crew or a life-saving craft with a capacity of up to 25 persons, with a total launching load not exceeding 30 kN.

The A-type LARS is a Russian-manufactured equivalent of the Palfinger PRH-AP A-type Launch and Recovery System, developed as part of an import substitution program.

The system was engineered for installation on an ice-class multifunctional rescue vessel operated by EMERCOM of Russia and complies with the following regulations and standards:

  • Part II “Life-Saving Appliances” of the Rules for the Equipment of Sea-Going Ships (2023) issued by the Russian Maritime Register of Shipping (RMRS);
  • International Life-Saving Appliance (LSA) Code, MSC.218(82);
  • IMO Resolution MSC.81(70);
  • SOLAS Convention, Chapter III (SOLAS 74/96).

Although originally developed for installation on an ice-class multifunctional rescue vessel for EMERCOM, the A-type Launch and Recovery System is also suitable for commercial vessels, naval ships, and other floating units. Izhora Hydrosystems LLC is ready to adapt and modify the design to meet the specific structural or operational requirements of the customer’s vessel or ship.

Advantages

The A-type Launch and Recovery System (LARS) manufactured by Izhora Hydrosystems provides a significantly higher recovery speed compared to the reference Palfinger PRH-AP model:
48 m/min versus 18 m/min when recovering the craft from the water.

In addition, the Russian-manufactured A-type LARS offers the following advantages:

  • Multiple operating modes: operation from an electric control panel, manual operation with the hydraulic pump running, or independent operation without electrical power using hydraulic accumulators;
  • Cost-efficient solution, with pricing independent of foreign currency exchange rates;
  • High reliability and maintainability, as the system is manufactured entirely from Russian materials and components, which also allows installation on naval vessels;
  • Flexible configuration options, including supply in basic configuration or with a set of optional features, as well as adaptation to specific operational tasks or installation conditions;
  • Regulated service life before factory overhaul of 10,000 operating hours or 13 years.

Standard Configuration and Optional Features

A-type LARS main structure at the Izhora Hydrosystems production facility

According to the design scope, the A-type Launch and Recovery System (LARS) is supplied with the following components:

  • A-type launch and recovery device;
  • Hydraulic Power Unit (HPU);
  • Spare Parts and Tools (SPT) set;
  • Operation and technical documentation.

As optional equipment, the system may be fitted with a Constant Tension (CT) system and a Wave Crest Pick-up function, as well as an anti-sway (anti-pendulum) device for minimizing load oscillations during overboard launching of a lifeboat or workboat.

The A-type LARS is designed for installation on ice-class vessels. However, depending on the vessel operating area and class, Izhora Hydrosystems LLC adapts the design to comply with the requirements of the Russian Maritime Register of Shipping (RMRS), the Russian River Register (RRR), and other applicable regulatory and supervisory authorities.

For consultation or to place an order for the A-type Launch and Recovery System, please contact our sales team:
Phone: +7 (812) 339-61-68
E-mail: contact@i-hydro.ru

Development History and Design Features

The order for an A-type Launch and Recovery System (LARS) was placed with Izhora Hydrosystems LLC by a company engaged in supply operations for the shipbuilding industry. Following the withdrawal of Palfinger from the Russian market, it became impossible to supply the PRH-AP A-type LARS specified for the vessel. The ice-class multifunctional rescue vessel project for EMERCOM, for which the system was required, had originally been designed around the overall dimensions and mounting interfaces of the imported unit. Therefore, a key requirement set for the engineers of Izhora Hydrosystems LLC was strict compliance with the original dimensional envelope and interface geometry.

As a result of the design and engineering work carried out by Izhora Hydrosystems LLC, the Russian-manufactured equivalent of the Palfinger PRH-AP A-type Launch and Recovery System fully matches the original unit in terms of installation dimensions and interfaces, while providing a significantly higher recovery speed of the craft from the water — 48 m/min compared to 18 m/min for the original PRH-AP model.

Operating Conditions and Operational Features

The A-type Launch and Recovery System (LARS) is approved for operation under the following conditions:

  • ambient air temperature from –35 °C to +50 °C;
  • vessel heel up to 20°;
  • vessel trim up to 10°;
  • sea state up to 3.

Throughout the entire service life, the A-type LARS shall be maintained in proper technical condition and in a state of full operational readiness in accordance with the recommendations specified in the Operation and Maintenance Manual developed by Izhora Hydrosystems LLC. When not in use, the A-type LARS shall remain in the stowed position.

When the LARS is in its initial stowed position, the following conditions shall be met:

  • the A-frame is raised; the swivel is in its uppermost position; the watercraft is secured on keel blocks;
  • the wire rope is correctly reeved on the system and free from twisting;
  • the hydraulic power unit is switched off and no pressure is present in the hydraulic system;
  • pressure gauge shut-off valves on the hydraulic power unit are open;
  • the handwheel of the manual winch drive is secured with a lanyard in its designated storage position on the rear wall of the hydraulic tank;
  • the control cabinet is de-energized; the two-position selector switch is set to “OFF”; all indicator lights are extinguished;
  • EMERGENCY STOP push buttons on the control cabinet are released (not actuated);
  • the “HOOK” selector switch is set to “RAISE”.
A-type LARS model in stowed position

Before operating the A-type Launch and Recovery System, all assemblies shall be visually inspected to confirm serviceability and to ensure that no foreign objects are present within the working area of moving parts that could obstruct operation. It shall also be verified that LARS operation will not create hazardous conditions or pose a risk to operating personnel. Following the external inspection, a full operational cycle of the LARS shall be performed. In addition, correct operation of the EMERGENCY STOP function and LARS operability in the absence of electrical power shall be verified.

During operational testing of the A-type LARS, the following parameters shall be monitored:

  • correct operation of all control elements and indicators, and absence of alarm signals on the control cabinet;
  • absence of abnormal behavior in LARS operation;
  • normal hydraulic system pressure;
  • absence of abnormal noise, vibration, impacts, or jerks in LARS components and in both the main and emergency hydraulic power units;
  • proper operation of the hook hoisting limit device;
  • free rotation of the winch and sheaves, correct rope travel and spooling on the winch drum;
  • absence of leakage at hydraulic fittings and cylinder seals;
  • integrity of hydraulic pipelines and absence of air in the hydraulic system;
  • capability of LARS operation in the event of loss of electrical power using the emergency hydraulic power unit and the manual pump.

When using the A-type Launch and Recovery System (LARS) to launch a watercraft from the stowed position, the following steps shall be performed:

  1. Prepare the watercraft for launching and operation in accordance with its Operation and Maintenance Manual.
  2. On the control cabinet, set the two-position selector switch to “ON”.
  3. Press the “START” push button to start the Hydraulic Power Unit (HPU).
  4. Connect the watercraft to the LARS, if this has not been done previously.
  5. Embark the crew or passengers into the watercraft.
  6. On the control pendant, press and hold the “OVERBOARD” button until the boom completes its movement.
  7. Release the remote release system shackle by removing the safety pin, then pull the shackle to initiate lowering of the watercraft.
  8. Disconnect the coupling device from the watercraft once tension in the wire rope is released.
  9. On the control pendant, press and hold the “HOIST” button until the “UPPER POSITION” indicator lamp illuminates, then release the button.
  10. On the control pendant, press and hold the “INBOARD” button until the boom returns to the stowed position.
  11. On the control cabinet, press the “STOP” push button to stop the HPU.
  12. Set the two-position selector switch on the control cabinet to “OFF”, after which all indicator lamps are extinguished.

Recovery of the watercraft from the water and positioning on the A-type Launch and Recovery System shall be carried out as follows:

  1. On the control cabinet, set the selector switch to “ON”; the 400 V indicator lamp will illuminate.
  2. Press the “START” push button to start the HPU.
  3. On the control pendant, press and hold the “OVERBOARD” button until the boom completes its movement.
  4. Release the winch brake and allow the wire rope to be lowered to the watercraft.
  5. Connect the watercraft to the LARS using the coupling device.
  6. Stop the watercraft engine, if it is running.
  7. Move the control valve lever to the “HOIST” position and wait until the “UPPER POSITION” indicator lamp illuminates, then return the lever to the neutral position.
  8. On the control pendant, press and hold the “INBOARD” button until the boom returns to the stowed position.
  9. Lower the watercraft onto the keel blocks.
  10. On the control cabinet, press the “STOP” push button to stop the HPU.
  11. Set the two-position selector switch on the control cabinet to “OFF”, after which all indicator lamps are extinguished.
  12. Secure the watercraft in the stowed condition in accordance with its Operation and Maintenance Manual.

During launching, recovery, and securing of the watercraft in the stowed position, the requirements of the Operation and Maintenance Manuals of all equipment involved shall be strictly observed.

In the event of a malfunction, the system can be operated via manual overrides located directly on the hydraulic control valves of the hydraulic power unit (HPU). Operation of the A-type Launch and Recovery System in the absence of electrical power is performed using the manual pump installed on the Hydraulic Power Unit. In emergency situations, to stop the HPU, interlock LARS operation, and activate the winch brake, one of the EMERGENCY STOP push buttons located on the control cabinet shall be pressed.

Upon completion of operations, the A-type Launch and Recovery System shall be returned to the stowed position. A visual inspection shall then be carried out to verify the absence of mechanical damage, leaks, or seepage of hydraulic fluid.

Technical Specifications

  • Safe Working Load (SWL) – 30 kN/ 3000 kgf;
  • Outreach over deck – max. 2.3 m;
  • Speed:
    • Hoisting speed (hydraulic): min. 0.8 m/s (48 m/min);
    • Lowering speed (gravity): 0.67–1.0 m/s (40–60 m/min);
  • Hydraulic power unit motor power – 45 kW;
  • Electrical power supply – 400 V, 50 Hz, 3-phase;
  • Wire rope 18-GL-VK-Zh-N-1860, GOST 2688-80:
    • Minimum breaking load (MBL) – 189.5 kN / 18.95 tf;
    • Wire rope travel – 25 m;
  • Manual operation force (max.):
    • Hoisting of craft at rated load: 160 N / 16 kgf;
    • Outboarding of craft at rated load: 160 N / 16 kgf;
  • Design Heel / Trim – max. 20° / 10°;
  • Climatic version (GOST 15150-69) – OM1; 
  • LARS weight (excluding hydraulic power unit) – 3800 kg;
  • Hydraulic power unit weight – 1650 kg;
  • Overall dimensions (LARS with HPU) – 3950х3160х3760 mm.

General Arrangement and Design

General arrangement and design of the A-type Launch and Recovery System
  1. main frame;
  2. subframe;
  3. boom assembly;
  4. hydraulic cylinders – 2 pcs.;
  5. keel block (cradle);
  6. tie rods (stays) – 2 pcs.;
  7. damper;
  8. winch;
  9. handwheel assembly;
  10. hydraulic piping installation;
  11. control wire rope installation;
  12. hydraulic power unit (HPU);
  13. access ladder.

The main frame of the A-type Launch and Recovery System (LARS) is a welded steel structure with flanges, serving as the primary load-bearing support for all mechanisms, including the winch. Together with these mechanisms, the frame rotates about a horizontal axis within the bearing arrangement of the subframe. The subframe is intended for mounting the mechanisms and securing the LARS to the vessel’s deck.

The welded boom assembly, designed to outboard the watercraft over the ship’s side, is bolted to the main frame via a flange connection. The boom is equipped with:

  • a sheave for the hoisting wire rope;
  • a damper;
  • sheaves for routing the remote-control wire rope used for watercraft lowering and boom outboarding;
  • a hoisting height limiter;
  • rope retainers preventing the wire rope from derailing from the sheave groove.
Installation of control wire ropes and damper on the A-type LARS boom

Two hydraulic cylinders, each fitted with integrated regulating valve blocks, are provided for outboarding the boom together with the watercraft and for raising it back into the stowed position.

Hydraulic cylinders mounted on the A-type LARS subframe

The keel block (cradle) with its supporting elements is mounted to the subframe via a bearing unit and is intended for supporting the watercraft in the stowed position. Together with the tie rods (stays), it limits the maximum boom outboarding angle. The tie rods are turnbuckles with threaded eye ends.

The damper is a single-acting hydraulic cylinder, normally maintained with the rod extended, designed to absorb shock loads acting on the wire rope suspension and the structural elements of the LARS.

The winch is used for launching and recovering the duty/rescue boat and consists of:

  • hydraulic motor;
  • brake;
  • gearbox.
Winch of the A-type Launch and Recovery System

Control of the winch hydraulic drive during hoisting is performed from the local control station. During gravity lowering, control is carried out either locally from the deck or remotely from the watercraft. The gravity lowering speed is regulated by the winch brake.

The handwheel for manual winch operation is a removable welded assembly. In the stowed position, it is stored on a bracket mounted on the hydraulic power unit. The bracket is equipped with a position sensor that interlocks the hydraulic drive, preventing activation during manual operation of the winch.

The A-type Launch and Recovery System includes a hydraulic piping installation kit for connecting the LARS hydraulic actuators to the hydraulic power unit, as well as a control wire rope installation kit for remote control of boom outboarding and watercraft lowering directly from the duty boat.

The hydraulic power unit (HPU), designed as a standalone assembly with an electric drive, serves as the source of hydraulic power for the LARS actuators. The HPU incorporates hydropneumatic accumulators, ensuring operation of the LARS in the event of electrical power loss.

An access ladder is provided for embarkation of crew or passengers into the watercraft.

Operational Safety

Reliable operation of the A-type Launch and Recovery System (LARS), including all required stops, starts, and switching operations, is ensured across all operating modes specified in the Operation and Maintenance Manual.

System reliability is highly dependent on the quality of the hydraulic fluid, including the presence of mechanical contaminants and water. Trouble-free operation of the LARS is only possible with strict compliance with hydraulic system cleanliness requirements. Only with continuous monitoring of hydraulic fluid quality and strict adherence to the procedures specified in the Operation and Maintenance Manual does the manufacturer, Izhora Hydrosystems LLC, guarantee normal operation of the LARS throughout its entire service life, provided that operating personnel comply with all requirements of the manual.

During operation of the A-type Launch and Recovery System, the following hazards may be present:

  • moving mechanical parts of the LARS;
  • energized electrical equipment;
  • pressurized hydraulic pipelines;
  • servicing the LARS on an open deck under sea motion;
  • wire rope under high tension.

During operation, personnel shall exercise caution and maintain continuous visual monitoring of LARS operation, including the position of moving parts and the routing and spooling of the wire rope.

To ensure safe operation of the LARS, the following requirements shall be observed:

  • comply with the operating documentation for the watercraft and all equipment operating in conjunction with the LARS;
  • comply with applicable fire safety regulations;
  • perform installation, dismantling, maintenance, and repair work only with the hydraulic system fully depressurized and all power supply feeders de-energized;
  • prevent the presence of unauthorized personnel not directly involved in servicing the equipment within the working area during functional checks. All checks shall be carried out under the supervision of a responsible person;

In the event of a failure or detection of a malfunction, immediately stop operation, identify the cause, and eliminate the failure or malfunction. Operation of defective equipment is strictly prohibited.

Documentation and Warranty

All third-party components used in the manufacture of the A-type Launch and Recovery System (LARS) that are subject to the requirements of the Russian Maritime Register of Shipping (RMRS) are supplied with the appropriate certificates or approvals. The scope of supply includes a complete set of accompanying documentation, including the Operation and Maintenance Manual and the Product Passport.

The LARS is transported to the installation site in packaged condition using any mode of transport that ensures compliance with Storage Condition “8” in accordance with GOST 15150-69. For ease of transportation, delivery on board, and storage, the equipment may be supplied disassembled into major assemblies.

At the manufacturing facility of Izhora Hydrosystems LLC, the LARS undergoes preservation treatment in accordance with GOST 9.014-78 as a Group V product, protection variant V3-1, prior to delivery to the vessel or placement into storage. Preservation is carried out to protect the equipment and the Spare Parts and Tools (SPT) set against corrosion during:

  • transportation and storage;
  • periods of inactivity exceeding three months in summer or one month in winter without routine maintenance.

Preserved LARS equipment may be stored for up to one year under severe conditions, including outdoor storage with protective covers applied. In such cases, the condition of the preservation shall be inspected at least once every six months, without dismantling the equipment or its assemblies. When stored in a dry warehouse, the allowable storage period is extended to two years.

The manufacturer of the A-type Launch and Recovery System, Izhora Hydrosystems LLC, has developed a comprehensive set of technical documentation to ensure safe and efficient operation of the equipment. The Operation and Maintenance Manual contains all necessary information on design, operating principles, technical characteristics, and measures to ensure operational safety and accident-free service.

Provided that all requirements for maintenance, routine repair, and operation are strictly observed, Izhora Hydrosystems LLC guarantees operation of the A-type Launch and Recovery System up to major overhaul for a period of 10,000 operating hours or 13 years, whichever occurs first.

For consultation or to place an order for the A-type Launch and Recovery System, please contact our sales team:
Phone: +7 (812) 339-61-68
E-mail: contact@i-hydro.ru