15t Parachute Type Underwater Lifting Bag Durable Material Long
Service Life
Description
The Parachute Type Underwater Air Lift Bags from Hongruntong Marine
are precision-engineered solutions for lifting, refloating, and
stabilizing heavy offshore structures. Designed to operate under
challenging marine environments, these underwater air lift bags
combine high tensile strength, corrosion resistance, and precise
buoyancy control to deliver exceptional performance in subsea
engineering, offshore construction, and salvage operations.
Constructed from high-tensile nylon fabric with dual-layer PVC
coating, these bags withstand abrasion, puncture, and chemical
exposure, making them ideal for long-term use in seawater and
oil-contaminated environments. Reinforced seams, stainless steel
fittings, and integrated multi-point lifting straps ensure uniform
load distribution, minimizing stress concentrations and risk of
failure.
The parachute-shaped design offers vertical stability during
inflation, reducing oscillation and drift, even when lifting long
pipelines, subsea modules, or irregularly shaped components.
Over-pressure relief valves and one-way check valves provide safe
and controllable inflation, while compatibility with standard
diving air systems and offshore compressors allows versatile
deployment in various operational scenarios.
With buoyancy capacities ranging from 1 ton to 50 tons, these lift
bags can be used individually or in series, providing scalable
solutions for projects of all sizes. Foldable, lightweight, and
reusable, they enable rapid deployment and retrieval, significantly
improving operational efficiency while maintaining strict safety
standards.
Case Study — Offshore Pipeline Installation, UAE
In 2023, Hongruntong Marine collaborated with a leading offshore
contractor in Abu Dhabi to facilitate the installation of a 1.2 km
subsea oil pipeline. The project presented multiple challenges:
uneven seabed topography, strong currents, and the need to lift
long, heavy pipe sections with precision.
Twelve 10-ton parachute type underwater lifting bags were deployed
along the pipeline at strategic intervals. Divers attached each bag
using reinforced stainless steel shackles and pre-marked lifting
points. The multi-valve inflation system allowed fine-tuned
adjustment of each bag’s buoyancy in real-time, compensating for
seabed irregularities and hydrodynamic forces.
The parachute-shaped lift bags maintained vertical alignment,
minimizing swinging and torsional forces during ascent. The
high-tensile, PVC-coated nylon fabric resisted abrasion from rocks
and sediments, while over-pressure relief valves prevented sudden
upward surges. This combination ensured safe, controlled lifting
throughout the operation.
Within 48 hours, the pipeline section was successfully lifted,
positioned, and secured to its designated seabed location. Compared
to previous projects using conventional lift bags, Hongruntong’s
solution increased operational efficiency by 25%, reduced diver
fatigue, and minimized safety risks. The project demonstrated the
reliability, precision, and versatility of Hongruntong Marine’s
underwater air lift bags in offshore engineering applications.
Specifications
| Product Name | Underwater Air Lift Bags |
| Raw Material | Top-Notch PVC Coating Fabric |
| Type | Parachute |
| Size | 500kg, 1000kg, 5000kg 10000kg,etc |
| Thickness | 0.4-1.2mm, or as request |
| Color | Yellow,Blue,Black,etc |
| Density | 0.33-0.9g/cm3 |
| Safety Factor | 7:1 |
| Accessories | Valve, Inflatable Tube, Repair Material |
| OEM | Welcome |
| Warranty | 3 Years |
Tolerances | +/- 0.03 on densities +/- 0.2 mm on thickness +/- 0 to +3mm on width +/- 0 to +3mm on length |
| Model | Lifting Capacity | Dimensions | Appr. Weight |
| Parachute | [kg] | [lbs] | [mm] | [kg] |
| HM-P01 | 200 | 441 | 800 | 5 |
| HM-P02 | 500 | 1,103 | 1,000 | 8 |
| HM-P03 | 1,000 | 2,205 | 1,300 | 11 |
| HM-P04 | 2,000 | 4,410 | 1,600 | 20 |
| HM-P05 | 4,000 | 8,820 | 2,000 | 50 |
| HM-P06 | 6,000 | 13,230 | 2,300 | 66 |
| HM-P07 | 8,000 | 17,640 | 2,500 | 75 |
| HM-P08 | 10,000 | 22,050 | 2,700 | 80 |
| HM-P09 | 15,000 | 33,075 | 3,100 | 110 |
| HM-P10 | 20,000 | 44,100 | 3,400 | 130 |
| HM-P11 | 30,000 | 66,150 | 3,900 | 170 |
| HM-P12 | 50,000 | 110,250 | 4,600 | 220 |
| HM-P13 | 70,000 | 154,350 | 5,200 | 310 |
| HM-P14 | 100,000 | 220,500 | 5,800 | 450 |
| HM-P15 | 150,000 | 330,750 | 6,600 | 660 |
| HM-P16 | 200,000 | 441,000 | 7,300 | 900 |
| *Note: Other sizes can be customized according to the requirements. |
Features
Parachute Shaped Vertical Stability Design
The unique parachute shape ensures vertical alignment during
inflation and ascent. Open-bottom construction allows controlled
air venting as the lift approaches the surface, preventing sudden
surges. This design is ideal for asymmetric loads and long
structures like pipelines or modular subsea units. Vertical
stability reduces torsion and oscillation, protecting both the load
and operators in dynamic offshore conditions.
High Tensile, Dual Layer Fabric
Constructed from high-tensile nylon with dual-layer PVC coating,
the bags offer outstanding resistance to abrasion, UV exposure,
chemical corrosion, and puncture. Reinforced seams and heat-welded
edges enhance structural integrity, enabling repeated use under
harsh offshore conditions. The fabric is designed to retain
flexibility even under low temperatures and high-pressure
underwater environments.
Integrated Safety and Inflation Control
Each bag includes over-pressure relief valves, one-way check
valves, and multiple inflation ports compatible with standard
diving air systems and offshore compressors. This allows divers or
operators to control inflation and buoyancy precisely. Multi-valve
design prevents sudden lift surges, ensuring safe, incremental
adjustments for long or heavy loads.
Modular, Scalable, and Reusable
The bags can be connected in series to achieve higher lift
capacities. Foldable, lightweight, and transportable, they can be
reused for up to 200 operational cycles. Field-repairable kits are
included for minor damages, allowing rapid maintenance without
removing the bag from the offshore site. This modularity makes them
ideal for complex offshore engineering operations requiring
scalable buoyancy solutions.
Applications
Offshore Oil Gas Pipeline Installation
Used to lift and stabilize long, heavy subsea pipelines during
placement. The parachute-shaped design ensures vertical stability
and controlled buoyancy, even in strong currents. Compatible with
diver-operated or remote-controlled inflation systems for precision
handling.
Subsea Module Deployment
Ideal for positioning subsea production units, ROV platforms, and
equipment modules. Allows for controlled, incremental lift and
placement on uneven seabed surfaces. Multi-unit connection enables
high-capacity lifting for oversized structures.
Salvage and Recovery Operations
Used for offshore salvage tasks including sunken vessels, anchors,
or subsea containers. The bags provide reliable lift and stability
in complex marine environments, improving operational safety and
efficiency for offshore recovery projects.
Why Choose Hongruntong Marine
Proven Offshore Engineering Expertise
Hongruntong Marine has over 20 years of experience supplying
underwater air lift bags and marine lifting solutions worldwide.
Our products have been deployed in hundreds of offshore projects,
including oil rigs, subsea pipeline installations, and salvage
operations.
Custom Engineering & OEM Capability
We provide fully customized lift bags tailored to project
requirements, including adjustable buoyancy, fabric type, parachute
shape, and valve configurations. OEM branding and design
modifications are available to meet client specifications.
Global Technical Support
Hongruntong offers worldwide technical support, including 24/7
consultation, on-site guidance, and spare parts logistics. Our
professional team assists clients in operational planning,
deployment strategies, and maintenance, ensuring maximum
performance and safety.
Rigorous Quality Assurance
Every lift bag undergoes hydrostatic testing, pressure
verification, and quality inspection before shipment. Our ISO 9001
certified manufacturing process ensures reliability, durability,
and operational safety in offshore and diving environments.
FAQ
1. What buoyancy range is available?
From 1 ton to 50 tons, with customized capacities available.
2. Can these lift bags be used in deep-water offshore operations?
Yes, designed for depths up to 100 meters or more, depending on
specifications.
3. Are repair kits included for field maintenance?
Yes, each bag includes patch kits and valve maintenance tools for
minor on-site repairs.
4. Are these bags compatible with standard diving air systems?
Yes, all bags are compatible with scuba tanks and offshore
compressed air sources.
5. Do you provide OEM branding or custom printing?
Yes, logos, serial numbers, and custom specifications can be
applied for bulk orders.
