Marine Lift Bag Puncture Resistant Surface Temperature Resistant
Material Quick Deployment System
Description
Underwater Lift Bags are not only used in heavy-duty salvage
operations but also play a vital role in delicate underwater
projects where precision and care are essential. These devices work
on the principle of buoyancy: by inflating the bag with air, water
is displaced, creating an upward lift force capable of moving
objects weighing from a few kilograms to several tons. The bags are
typically constructed from high-strength, UV-resistant materials
with double-stitched seams and reinforced lifting straps. This
makes them durable enough to withstand repeated use in challenging
marine environments. In restoration and research work, lift bags
allow divers to transport heavy structures—such as artificial reef
modules or scientific equipment—without disturbing the surrounding
habitat. Many models offer fine-tuned inflation control, enabling
gradual, steady ascents that prevent sudden shifts or damage to
fragile ecosystems. Since lift bags require no fuel or complex
hydraulics, they are environmentally friendly and portable, making
them a preferred choice for marine biologists, conservation groups,
and eco-focused diving teams.
( Case: On a tropical coastline, a marine conservation team was
tasked with restoring a damaged coral reef. Part of the project
involved placing several large concrete reef blocks — each weighing
around 500 kg — into specific positions to encourage coral regrowth
and provide shelter for marine life. Using traditional lifting
equipment would have risked disturbing the seabed and harming
nearby corals. Instead, divers deployed medium-capacity Underwater
Lift Bags. Each block was fitted with lifting slings connected to
the bags, and the divers slowly inflated them until the blocks
became neutrally buoyant. This allowed the divers to guide the
blocks gently into place by hand, ensuring precise positioning
without creating harmful sediment clouds. Once positioned, the
divers released a small amount of air to settle the blocks securely
onto the seabed. Over several weeks, the process was repeated for
dozens of modules. The team reported zero coral damage and saw fish
return to the new structures within days. The project became a
model for eco-friendly reef restoration, demonstrating how lift
bags can combine technical capability with environmental
stewardship. )
Specifications
| Product Name | Underwater 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-ULB01 | 200 | 441 | 800 | 5 |
| HM-ULB02 | 500 | 1,103 | 1,000 | 8 |
| HM-ULB03 | 1,000 | 2,205 | 1,300 | 11 |
| HM-ULB04 | 2,000 | 4,410 | 1,600 | 20 |
| HM-ULB05 | 4,000 | 8,820 | 2,000 | 50 |
| HM-ULB06 | 6,000 | 13,230 | 2,300 | 66 |
| HM-ULB07 | 8,000 | 17,640 | 2,500 | 75 |
| HM-ULB08 | 10,000 | 22,050 | 2,700 | 80 |
| HM-ULB09 | 15,000 | 33,075 | 3,100 | 110 |
| HM-ULB10 | 20,000 | 44,100 | 3,400 | 130 |
| HM-ULB11 | 30,000 | 66,150 | 3,900 | 170 |
| HM-ULB12 | 50,000 | 110,250 | 4,600 | 220 |
| HM-ULB13 | 70,000 | 154,350 | 5,200 | 310 |
| HM-ULB14 | 100,000 | 220,500 | 5,800 | 450 |
| HM-ULB15 | 150,000 | 330,750 | 6,600 | 660 |
| HM-ULB16 | 200,000 | 441,000 | 7,300 | 900 |
| *Note: Other sizes can be customized according to the requirements. |
Features
Fail Safe Pressure Release
Automatic venting systems activate at predetermined pressures
(typically 15-20% above working limits) to prevent over-expansion.
Professional Attachment System
Heavy-duty stainless steel D-rings rated at 5:1 safety factor with
integrated load distribution webbing.
High Visibility Markings
Fluorescent orange/yellow coloration with retroreflective striping
for enhanced visibility in low-light conditions.
Precision Buoyancy Control
Micro-adjustment valves allow for 0.5kg incremental lift
adjustments during delicate operations.
Applications
Aquaculture Operations
Positions and maintains fish farm net pens, feeding systems, and
harvesting equipment. Provides buoyancy for heavy installations in
marine farms.
Underwater Photography Videography
Stabilizes cameras, lighting rigs, and filming equipment for clear
shots. Adjusts buoyancy for precise positioning during shoots.
Marine Environmental Cleanup
Removes sunken debris, discarded fishing gear, and pollutants.
Assists in oil spill responses and artificial reef placements.
Advantages
ROV Integrated Design Capability
Bags can be customized with standardized ROV interfaces for remote
deepwater operations.
Corrosion Proof Hardware
All metal components use marine-grade 316L stainless steel with
electropolished surfaces.
Modular Buoyancy Systems
Patented interconnect technology allows multiple bags to function
as synchronized lifting arrays.
Abrasion-Resistant Armor Options
Kevlar-reinforced base panels available for operations involving
sharp or rough surfaces.
FAQ
1. What's your lead time for standard orders?
Most standard configurations ship within 5-7 working days;
expedited 48-hour service is available.
2. Do you provide on-site training?
Yes, we offer comprehensive operator training programs at your
facility or ours.
3. How are bags packaged for shipping?
Units are vacuum-sealed with anti-corrosion treatment, shipped in
heavy-duty transit cases with full documentation.
4. Can bags be repaired if damaged?
We offer global repair services with original materials - most
repairs are completed within 5 working days.
