Marine Lifting Bag Marine Grade Fabric Reinforced Webbing Straps High Tensile Strength​

Description

Hongruntong Marine Inflatable Salvage Tubes are engineered cylindrical underwater lift bags designed for heavy-duty marine salvage, lifting, and stabilization operations. Built from reinforced multi-layer PVC-coated fabric, these tubes deliver high tensile strength, excellent flexibility, and outstanding durability in harsh marine environments. The cylindrical design ensures uniform buoyancy distribution along the tube’s length, minimizing stress on hulls, pontoons, and floating modules while enabling controlled vertical lift.

Each tube incorporates industrial-grade inflation and overpressure relief valves, providing precise buoyancy control. Operators can inflate or deflate incrementally, ensuring gradual lift and minimizing the risk of structural damage or sudden load shifts. The modular design allows multiple units to be deployed simultaneously, delivering scalable lift capacity for a range of vessel sizes and marine structures. Lightweight yet robust, these salvage tubes are reusable, cost-effective, and optimized for repeated shipyard operations.

In addition to lifting, the tubes are suitable for stabilizing vessels, adjusting trim, and providing temporary buoyancy during maintenance, repair, or construction. Their high abrasion resistance, UV and saltwater durability, and airtight integrity make them reliable in shipyard, port, and nearshore operations.

Case Study – Mid Life Hull Section Rebalancing of a 1,800 DWT Cargo Vessel

A coastal shipyard was tasked with performing mid-life refurbishment on a 1,800 DWT general cargo vessel. During the replacement of corroded internal steel structures, a section of the hull became unbalanced, creating uneven draft and posing safety risks for welders and structural crews. Conventional crane lifts were limited due to yard congestion and high operational costs, prompting the need for a controllable underwater buoyancy solution.

Hongruntong Marine Inflatable Salvage Tubes were deployed beneath the affected hull section along the starboard side. Sequential inflation enabled controlled lift, gradually correcting the vessel’s trim and heel without inducing localized stress on the hull plating. The cylindrical geometry distributed buoyant forces evenly, ensuring a stable lift throughout the operation.

The operation was completed within a single working shift, with no structural damage reported. Crane usage was reduced by 40%, saving time and operational costs. After the procedure, the salvage tubes were deflated, recovered, and stored for reuse in subsequent shipyard projects. The shipyard later confirmed repeat utilization of the same units, highlighting durability, long-term value, and operational reliability.

This case demonstrates the effectiveness of cylindrical Inflatable Salvage Tubes for precision lifting, temporary stabilization, and operational efficiency in shipyard environments. They proved essential for safe hull handling, reduced downtime, and enhanced workplace safety.

Specifications

Features

Rapid Inflation for Emergency Scenarios

The tubes can be quickly deployed and inflated, providing immediate buoyancy support during accidents or unforeseen events.

High Airtight Integrity Under Load

Reinforced bladder construction ensures minimal air leakage, maintaining stable lift for extended periods, even on damaged hulls.

Flexible Cylindrical Design for Damaged Hulls

Cylindrical geometry allows the tubes to conform to various hull shapes, distributing load evenly and reducing stress on compromised structures.

Portable and Reusable for Field Operations

Lightweight, compact design enables transport by small vessels or vehicles, while robust materials support repeated emergency use.

Applications

Emergency Vessel Stabilization

Rapidly stabilize partially flooded or capsizing vessels in ports, coastal waters, or offshore areas.

Salvage Operations and Rescue Missions

Used by salvage teams to provide temporary lift for damaged or grounded vessels, enabling safer recovery.

Temporary Buoyancy for Accident Mitigation

Prevents total loss of vessels and equipment before permanent repairs can be performed.

Advantages

Proven Emergency Response Expertise

Products have been deployed successfully in real-world accident and rescue scenarios, demonstrating reliability under pressure.

Fast Customization and Deployment Support

Hongruntong Marine provides guidance for tube configuration and buoyancy requirements in time-critical situations.

Durable Materials for Multiple Deployments

Reinforced fabric and valves ensure repeated usability in successive emergency operations.

On Call Technical Assistance

Experienced engineers provide operational advice, inflation sequencing, and placement strategies for emergency use.

FAQ