A Launch and Recovery System (LARS) is an essential piece of equipment used in offshore, marine, subsea, and commercial diving operations. It is designed to safely deploy and recover divers, remotely operated vehicles (ROVs), and other subsea equipment between a vessel, platform, or offshore structure and the water.
Offshore operations often take place in challenging marine environments where waves, vessel movement, heavy equipment, and underwater conditions can create significant operational risks. A reliable launch and recovery system provides controlled lifting, lowering, deployment, and recovery, helping operators improve safety and efficiency.
JK Subsea Engineering Pvt. Ltd. designs and manufactures subsea and offshore engineering equipment, including Launch & Recovery Systems for commercial diving and subsea applications. Its LARS solutions are engineered for demanding marine environments and can support diver and equipment deployment operations.
What Is a Launch and Recovery System?
A Launch and Recovery System, commonly called LARS, is an engineered mechanical and hydraulic system used to safely lower and retrieve people or subsea equipment from the water.
Depending on the application, a LARS can be configured to handle commercial divers, diving baskets, ROVs, AUVs, underwater tools, inspection equipment, and other subsea assets.
The system provides controlled movement during deployment and recovery. This is particularly important in offshore environments where uncontrolled movement can damage equipment or create safety risks for personnel.
A typical LARS may include an A-frame or lifting structure, hydraulic winch, docking head, hydraulic power unit, control panel, and associated lifting and handling components.
How Does a LARS System Work?
The basic operation of a LARS system involves three primary stages:
1. Deployment
The equipment or diving personnel are positioned on the vessel or offshore platform. The lifting mechanism moves the payload toward the side of the vessel and carefully lowers it into the water.
2. Subsea Operation
Once the equipment or diver reaches the required underwater position, the LARS provides controlled support during the operation. Depending on the system design, operators can control winch and lifting movements from the control system.
3. Recovery
After completing the underwater operation, the system retrieves the diver or equipment from the water. Controlled lifting helps bring the payload safely back onto the vessel or designated platform area.
This controlled deployment and recovery process makes LARS an important part of professional subsea and offshore operations.
Main Components of a Launch and Recovery System
A launch and recovery system can contain several important components, depending on its design and intended application.
A-Frame
The A-frame provides the structural support required for moving and lowering the payload between the vessel and water.
Hydraulic Winch
The hydraulic winch provides controlled lifting and lowering of divers or subsea equipment. Precise winch operation is particularly important during deployment and recovery.
Hydraulic Power Unit
The hydraulic power unit supplies hydraulic power to the system's operating components. It supports controlled movement of the winch and other hydraulic equipment.
Docking Head
A docking head can be used to provide controlled connection and handling of subsea equipment during launch and recovery operations.
Control Panel
The control system allows operators to manage important LARS functions, including winch and A-frame movements, depending on the system configuration.
JK Subsea's LARS system uses hydraulic-electric operation and proportional directional control for winch, A-frame, and docking-head operations.
Applications of Launch and Recovery Systems
LARS equipment is used across several offshore and subsea industries.
Commercial Diving
A LARS diving system allows commercial divers to be safely deployed and recovered during underwater inspection, maintenance, construction, and other diving activities.
Offshore Oil and Gas
The oil and gas industry uses launch and recovery equipment for subsea inspection, maintenance, installation, and handling of underwater tools and equipment.
Subsea Inspection and Maintenance
Inspection teams may need to deploy cameras, sensors, ROVs, diving equipment, and specialized underwater tools. A suitable LARS provides controlled handling during these activities.
ROV Deployment
ROVs are widely used for underwater inspection and intervention. An ROV launch and recovery system allows remotely operated vehicles to be deployed from a vessel and recovered after completing their subsea mission.
Marine Construction
Underwater construction projects may require the deployment of tools, equipment, and personnel. A reliable LARS helps operators manage these operations efficiently.
Underwater Installation
Subsea installation projects can require controlled deployment of equipment and components into the water. LARS equipment can provide the lifting and recovery capability required for such operations.
Benefits of Using a Launch and Recovery System
Improved Safety
Safety is one of the most important reasons for using a dedicated LARS. Controlled deployment and recovery can help reduce risks associated with manually handling heavy subsea equipment or divers.
Better Operational Control
A LARS provides controlled movement during lifting and lowering operations. This allows operators to manage deployment and recovery more precisely.
Increased Efficiency
Efficient launch and recovery procedures can reduce unnecessary handling time and support smoother offshore operations.
Equipment Protection
Subsea equipment can be expensive and sensitive. Controlled handling helps reduce the possibility of impact or uncontrolled movement during deployment and retrieval.
Offshore Reliability
LARS equipment is designed for demanding marine environments and can be engineered according to project-specific requirements, vessel configurations, payloads, and operating conditions.
Why Standards and Safety Matter for LARS
Offshore lifting and diving equipment operates in environments where equipment reliability and safety are critical. Therefore, the design and manufacturing of a LARS should take applicable industry standards and project requirements into consideration.
JK Subsea's Launch & Recovery System is designed with reference to IMCA D018 and D023 and DNV Offshore Lifting Appliances requirements. Its listed system specifications include a 75 m seawater depth capability, 2-ton safe working load, hydraulic-electric operation, and operation in specified sea-state conditions.
Project requirements can vary, so operators should always verify the applicable standards, certification, load requirements, vessel integration requirements, and operating conditions before selecting equipment.
How to Choose the Right LARS System
Selecting the right launch and recovery system depends on several factors.
Payload Capacity
The safe working load should be appropriate for the diver, ROV, equipment, or other subsea payload being deployed.
Operating Depth
The required operating depth should be considered when selecting a LARS system.
Vessel Configuration
The available deck space, mounting arrangement, vessel structure, and operating area can influence the design and configuration of the system.
Sea Conditions
Offshore operations can involve changing sea states and vessel movement. The LARS should be appropriate for the intended operating environment.
Hydraulic and Electrical Requirements
The available power supply and hydraulic requirements should match the system specifications.
Maintenance and Support
Long-term maintenance, inspection, testing, spare parts, and technical support are also important considerations when selecting offshore equipment.
Why Choose JK Subsea for Launch and Recovery Systems?
JK Subsea Engineering Pvt. Ltd. provides engineering solutions for offshore, marine, subsea, and diving applications. The company manufactures and supplies Launch & Recovery Systems designed for commercial diving and subsea operations.
Its LARS solutions are designed for applications such as commercial diving, offshore oil and gas, subsea inspection and maintenance, marine construction, underwater installation, and ROV deployment and recovery.
JK Subsea also focuses on custom engineering, manufacturing, maintenance, and offshore equipment solutions, supporting customers across India and international markets.
Conclusion
A Launch and Recovery System plays a critical role in modern offshore and subsea operations. From commercial diving and ROV deployment to subsea inspection, maintenance, and marine construction, LARS equipment provides controlled and reliable handling of divers and underwater assets.
Choosing the right LARS system requires careful consideration of payload capacity, operating depth, vessel configuration, sea conditions, power requirements, safety standards, and maintenance support.
For organizations looking for reliable offshore and subsea equipment, JK Subsea Engineering Pvt. Ltd. offers engineered Launch & Recovery System solutions designed for demanding marine and diving applications.
For more information about Launch & Recovery Systems and their specifications, visit the JK Subsea service page.
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