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Telescopic LARS for ROV, SWL 3.5t (Technical supply specification)


1. General Information (Operating Conditions)

Environmental operating conditions for the telescopic ROV LARS correspond to climate category OM1 according to GOST 15150-69, at an ambient air temperature from -30 °C to +40 °C and 98% relative humidity at +35 °C.

Environmental storage and transportation conditions for the LARS correspond to category Zh1 according to GOST 15150-69, at an ambient air temperature from -40 °C to +50 °C.

The telescopic ROV LARS maintains its operational performance under the following conditions:

  • Permanent heel and trim: min. 5°
  • Simultaneous vessel motions:
    • Vertical amplitude: ±1.1 m (10 s period)
    • Roll amplitude: ±7° (10 s period)
    • Pitch amplitude: ±3° (8 s period)
  • Wind speed: min. 10 m/s
  • External mechanical loads: group M3 according to GOST 30631-99

The telescopic ROV LARS maintains its structural integrity and operational performance after exposure to survival conditions:

  • Heel and trim: up to 30°
  • Vessel motions:
    • Vertical amplitude: ±5.0 m (15 s period)
    • Roll amplitude: ±30° (15 s period)
    • Pitch amplitude: ±15° (10 s period)
  • Wind speed: min. 35 m/s
  • External mechanical loads: groups M25 and M32 according to GOST 30631-99
  • Heavy icing

On-deck arrangement of the telescopic ROV LARS:

  • Longitudinally: at the stern, 25 m horizontal distance from the vessel center of gravity to the aft envelope of the telescopic ROV LARS
  • Transversely: at the shipside, 2 m horizontal distance from the vessel center of gravity to the outboard envelope of the telescopic ROV LARS

2. Purpose

The telescopic ROV LARS is designed for:

  • Vertical handling (launch and recovery) of the ROV above the LARS deck and outboard to/from the water
  • Horizontal handling of the ROV from the LARS deck to the outboard position and vice versa
  • Stowing and securing the ROV on the LARS deck during maintenance, transportation, and storage
  • Stowing and securing the umbilical winch on the LARS deck during operation, transportation, and storage
  • Stowing and securing spare parts, tools, and accessories (STCW) in transit cases, as well as other auxiliary equipment on the LARS deck during transportation and storage
Telescopic ROV LARS, 3.5 t SWL. General arrangement drawing (stowed position)
Telescopic ROV LARS, 3.5 t SWL. General arrangement drawing (stowed position)

About

Telescopic ROV LARS: Precision Launch and Recovery for Deep-Sea Operations

Advanced On-Deck Technology

The telescopic LARS (Launch and Recovery System) for ROVs (Remotely Operated Vehicles) converts complex offshore operations into a predictable and safe process. The system ensures controlled launch and recovery of the deep-sea vehicle from the vessel deck to the water and vice versa, independent of wave and wind conditions. Smooth boom luffing and the telescopic design deliver positioning accuracy that conventional cranes cannot guarantee.

Engineered Precision

The hydraulic system and pivoting davit enable synchronized control of launch and recovery operations. Even during vessel motions, the LARS maintains a stable suspension point without shock loads. The operator controls the process from a fixed control station located outside the hazard area, while integrated lighting and instrument displays ensure safe operation during night hours.

Adaptability and Flexibility

The telescopic LARS design allows for easy modifications: integrating a stabilizing docking frame or wireless control converts the system into a versatile tool for various scientific research applications. This approach enables rapid adaptation to new research requirements without extensive structural modifications.

Reliability and Support

The telescopic ROV LARS combines structural strength, positioning accuracy, and resistance to survival environmental conditions. Production and service are provided by Izhora Hydrosystems LLC, ensuring safe operations and allowing operators to focus fully on subsea tasks. RS (Russian Maritime Register of Shipping) certification and OEM warranty ensure long-term equipment operation.


3. Scope of Supply

3.1 Telescopic ROV LARS, 3.5 t SWL

3.1.1 Product Composition

ComponentQuantity
LARS Structure, comprising:1
– LARS platform1
– A-frame1
LARS Hydraulic System, comprising:1
– Electro-hydraulic power unit (HPU)1
– Hand pump1
– Double-acting A-frame hydraulic cylinder2
– Air oil cooler1
– Electric oil heater1
– Instrumentation and indicator package1
– Hydraulic valve and manifold assembly1
– Fitting, piping, and high-pressure hose (HPH) assembly1
LARS Electrical System, comprising:1
– Main switchboard (MSB)1
– Floodlights2
– Local light fixtures2
– Internal cable network1
– External power supply cable, 50 m1
Cargo Winch, comprising:1
– Winch frame1
– Drum1
– Hydraulic drum drive1
– Spooling device1
– Brake1
– Wire rope1
Pivoting Davit, comprising:1
– Davit foundation1
– Boom1
– Manual self-locking slewing mechanism1
– Suspension unit1
– Roller assembly for ROV umbilical1
LARS Spare Parts, Tools, and Accessories (STCW) Package, comprising:1
– Four-leg lifting sling1
– Sea-fastening equipment for LARS deck mounting1
– LARS protective cover1
– HPU protective cover1
– Spare high-pressure hose (HPH) kit1
– Component-level individual STCW kits1
Telescopic ROV LARS, 3.5 t SWL. General arrangement drawing (operating position)
Telescopic ROV LARS, 3.5 t SWL. General arrangement drawing (operating position)

3.1.2 Main Parameters

ParameterValue
Model typeTelescopic LARS
Safe Working Load (SWL)3.5 t
Power consumption40 kW
LARS weight8,000 kg
Total weight of LARS with installed equipment16,000 kg
Dimensions of telescopic ROV LARS in transport configurationComply with GOST R 53350-2009 requirements for size 1CX containers

3.1.3 Spare Parts, Tools, and Accessories (STCW) Kit

  • Four-leg lifting sling
  • Sea-fastening equipment for mounting the telescopic ROV LARS on the vessel deck
  • Telescopic ROV LARS protective cover
  • HPU protective cover
  • Spare high-pressure hose (HPH) kit (100%)
  • Component-level individual STCW kits for telescopic ROV LARS systems

Optional:
The OEM standard STCW kit is configured for 10 years of operation. Additional spare parts can be specified and supplied under a separate agreement with the customer.

3.1.4 Documentation

DocumentQuantity
Technical passport1
Installation and operation manual1
STCW list1
Factory acceptance test (FAT) report1

3.1.5 Certificates

The telescopic ROV LARS is supplied with one (1) copy of the RS (Russian Maritime Register of Shipping) Certificate.

Telescopic ROV LARS, 3.5 t SWL. Isometric view
Telescopic ROV LARS, 3.5 t SWL. Isometric view

4. Additional Requirements

4.1 General Technical Requirements for Supply

  • All electrical equipment installed on the open deck has an IP56 protection class.
  • All materials are resistant to operating temperature conditions from -30 °C to +50 °C.
  • Coating system: coating scheme and color to be agreed with the Customer.
  • Hydraulic system fluid: AUP hydraulic oil.
  • Hydraulic fluid cleanliness class according to GOST 17216-71: min. Class 12.
  • Control system: anti-condensation electric heating for control cabinets and electric motors.
  • The telescopic ROV LARS is designed, manufactured, and tested in accordance with RS (Russian Maritime Register of Shipping) rules.
  • The LARS structure incorporates dedicated lifting points for handling and lifting operations.

4.2 Structural Requirements

4.2.1 Structural Requirements for Telescopic ROV LARS Structure

  • The LARS structure incorporates a LARS platform for stowing and securing the main components and auxiliary equipment.
  • The LARS platform rests on corner castings according to GOST R 51891-2008. Platform interface dimensions at the corner casting centers comply with GOST R 53350-2009 requirements for size 1CX containers. Two additional pairs of intermediate castings are provided, positioned at a distance corresponding to size 1DX containers according to GOST R 53350-2009.
  • The LARS platform is equipped with heavy-duty vertical flanges on the port side, starboard side, and aft for bolted connection to the vessel deck via removable interface foundations.
  • The LARS structural design includes four padeyes for lifting operations using a four-leg sling without a spreader beam.
  • Rigging points are arranged along the perimeter of the LARS platform deck for temporary securing of STCW transit cases and other auxiliary equipment during transportation and storage.
  • The LARS structure incorporates a luffing A-frame designed for hoisting and transferring the ROV from the LARS platform deck to the outboard position and vice versa.
  • The horizontal outreach of the suspension point from the forward edge of the LARS deck is maximized and measures at least 3.5 m.
  • A removable, rigid, protective safety railing is installed on the LARS platform between the A-frame pivot points. The railing features a central vertical opening to allow the deployment of the umbilical cable with a depressor weight onto the platform deck.
  • The LARS platform provides a dedicated stowage and sea-fastening position for the ROV in both longitudinal and transverse configurations.
  • The LARS platform provides a dedicated stowage and sea-fastening position for the umbilical winch in both operational and transit configurations.
  • A modular, collapsible shelter is provided on the LARS platform to protect the ROV from wind and precipitation, enabling maintenance and repair operations during adverse weather conditions.
  • The deck areas of the platform free of LARS equipment are covered with removable grating, which prevents personnel slippage and protects the electrical cables, hydraulic piping, and high-pressure hoses (HPH) routed underneath from mechanical damage. Routing of electrical cables, hydraulic piping, and high-pressure hoses on top of the grating is not permitted.
  • The LARS structure complies with the RS Rules for Offshore Containers.
  • The strength of the LARS sea-fastenings to the vessel deck and the structural interfaces between individual LARS components complies with the minimum requirements of the RS document “Guidelines for the Preparation of Cargo Securing Manuals” ND No. 2-030101-008.

4.2.2 Structural Requirements for Telescopic ROV LARS Hydraulic System

  • The electric oil heater in the HPU tank is equipped with an automatic circuit breaker that disconnects the heater power supply when the hydraulic fluid reaches the preset temperature. A status light indicator is provided to signal heater operation.
  • The air oil cooler is equipped with an electric-drive fan. The fan starts automatically when the hydraulic fluid temperature reaches the upper preset limit and stops automatically when the temperature drops to the lower preset limit.
  • Visual and audible alarms are provided to signal when the hydraulic fluid temperature exceeds the maximum preset limit. The audible alarm features a manual mute function after activation.
  • The system ensures stepless speed control of the A-frame hydraulic cylinder rods and allows locking them in any intermediate position.
  • The system ensures synchronized and smooth operation of the A-frame hydraulic cylinders. Stick-slip effects, jerky movements, or oscillations during A-frame travel are not permitted.

4.2.3 Structural Requirements for LARS Electrical System

  • The telescopic ROV LARS is powered by an AC network with the following characteristics: 400 V, 50 Hz, 3 phases without neutral.
  • The main switchboard (MSB) front panel features status lights indicating the presence of 400 V external incoming voltage, as well as 400 V and 230 V voltage on the MSB busbars.
  • The MSB incorporates an automatic residual current device (RCD) for the internal 230 V LARS network, configured to trip at a leakage current of 30 mA or higher.

4.2.4 Structural Requirements for Cargo Winch

  • The LARS incorporates a hydraulic cargo winch with a steel wire rope for ROV launch and recovery operations. The rope length ensures deployment of the suspension point to a depth of 10 m below the LARS platform support surface.
  • The paying-out and hauling-in speed of the wire rope is min. 1 m/s.
  • The live end of the wire rope is fitted with an ROV latch/latch mechanism (supplied by the Customer) for automatic connection to the ROV lifting bullet. Disconnection of the latch from the ROV is performed remotely and manually via a synthetic line. The umbilical cable serves as the guide wire for guiding the latch mechanism onto the ROV lifting bullet.

4.2.5 Structural Requirements for Pivoting Davit

  • The davit boom incorporates a roller guide assembly for routing the umbilical cable from the umbilical winch to the ROV.
  • The davit provides a hinged suspension for the umbilical roller guide assembly and ensures its horizontal transfer from the LARS deck to the outboard position and vice versa.
  • The horizontal outreach of the davit boom from the forward edge of the LARS deck to the suspension point of the umbilical roller guide assembly is maximized and measures at least 1 m.
  • The suspension point height of the umbilical roller guide assembly above the LARS platform deck ranges from 1.5 m to 1.8 m.
  • The Safe Working Load (SWL) of the davit is 500 kg.
  • The design of the roller guide assembly allows for the installation and removal of the umbilical cable without disconnecting either end of the cable and without removing the roller guide assembly from the davit.

4.2.6 Structural Requirements for LARS Controls

  • The LARS incorporates a fixed open control station.
  • The LARS control station is located outside the hazard area associated with a potential wire rope failure.
  • The control station layout is configured for standing operation.
  • The control panel at the station is equipped with a hinged cover to protect the controls and display instruments during LARS transportation and storage.

4.3 General Requirements for Materials and Components

  • All applied materials and commercial off-the-shelf (COTS) components are configured for year-round operation in marine environments.
  • The LARS structure is fabricated from weldable structural steel approved for the manufacturing of marine lifting appliances.
  • Removable rigging hardware is fabricated from stainless steel.
  • The MSB enclosure is fabricated from stainless steel.
  • All interface fittings, piping, valves, and other hydraulic manifold components are fabricated from stainless steel.
  • The HPU tank is fabricated from stainless steel.
  • All fasteners used in the LARS design are fabricated from stainless steel.
  • Grade 10Kh17N13M2 stainless steel according to GOST 5632-2014 is generally applied (imported equivalents A4 and AISI 316 are permitted).
  • Preservation coatings ensure LARS storage in unheated facilities for a minimum of 24 months.

4.4 Ergonomic Requirements

  • The arrangement of controls and information displays for the LARS instrumentation complies with GOST 12.2.033-78 and GOST 12.2.061-81.
  • All LARS controls are integrated into a single LARS control panel.
  • Information displays for all measurement and monitoring instruments used during LARS operation are integrated into the LARS control panel. Installation of instrument display repeaters on the control panel is permitted.
  • The LARS control panel is equipped with dedicated local lighting.

4.5 Regulatory Requirements

The telescopic ROV LARS complies with the requirements of the following regulatory documents:

  • RS Rules for Lifting Appliances of Ships, ND No. 2-020101-179.
  • RS Rules for the Classification and Construction of Unmanned Submersibles, ND No. 2-020201-023.
  • RS Collection of Rules for Containers, ND No. 2-090201-014.
  • RS Technical Requirements for the Arrangement and Securing of International Standard Containers on Ships Adapted for Their Carriage, ND No. 2-020101-015.
  • RS Guidelines for the Preparation of Cargo Securing Manuals, ND No. 2-030101-008.
  • Technical Regulation of the Customs Union TR CU 020/2011 “Electromagnetic Compatibility of Technical Products”.

4.6 Reliability Requirements

  • The design life of the LARS, including storage time, is 10 years from the date of acceptance. The lifetime of integrated commercial off-the-shelf (COTS) components, rubber products, high-pressure hoses (HPH), and cable products complies with the original documentation for these individual items.
  • The operating time of the LARS until the first factory overhaul is 5 years from the date of commissioning.
  • The telescopic ROV LARS is configured for continuous operation for up to 120 hours without scheduled maintenance.

4.7 Additional Options

  • The LARS design allows for variations and upgrades based on the core engineering project. The structure supports the integration of the following optional requirements.
  • Integration of a docking frame hinged to the A-frame crossbar. The docking frame is designed to mitigate the swinging of the suspended ROV during wire rope handling. The lower section of the docking frame incorporates a fairlead with two pairs of rollers for routing the wire rope. When the docking frame is installed, the latch mechanism is omitted.
  • Integration of a latch mechanism designed to restrict uncontrolled swinging and ensure forced orientation of the ROV in the horizontal plane when in the fully raised position. When the latch mechanism is installed, the pivoting davit is optional.
  • Integration of a remote control system for all LARS actuators via a portable pendant control panel. The fixed control station remains fully functional.
  • Integration of a built-in drip tray in the LARS platform to collect leaked technical fluids. The tray extends across the entire footprint of the LARS platform. A minimum of four drain connections are provided to drain the collected fluids, configured for interfacing with quick-connect couplings.

Note:

  • Izhora Hydrosystems LLC can equip the telescopic ROV LARS with any other options outside this scope upon customer request.

5. Manufacturer

The complete telescopic ROV LARS is manufactured by Izhora Hydrosystems LLC.


6. Warranty Period

  • The warranty period for the LARS, including its coating system (excluding mechanical damage) and commercial off-the-shelf (COTS) components, is 24 months from the date of commissioning, but no later than 36 months from the delivery date.

Contacts

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