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Marine Lift Bag Puncture Resistant Surface Temperature Resistant Material Quick Deployment System

Categories Underwater Lift Bags
Brand Name: Hongruntong Marine
Model Number: HM-ULB74
Certification: ISO, BV, ABS, DNV, LR, SGS, CCS, RMRS
Place of Origin: China
MOQ: 1
Price: US$10-US$870
Payment Terms: L/C, T/T, D/A, D/P, Western Union, MoneyGram
Supply Ability: 9800 Pcs Per Month
Delivery Time: 5-7 Work Days
Packaging Details: Wooden Pallets, Wooden Box
Product Name: Underwater Lift Bags
Material: Top Notch PVC Coating Fabric
Reinforcement: Nylon Fabric
Lifting Capacity: 200Kg to 50 Tons
Feature: Superior Buoyancy
Type: Parachute
Thickness: 0.4mm-2.5mm, or As Request
Layers: 1-6Ply, or as Request
Valve: Inflation and Pressure Release
Color: Black, Yellow, Orange, or As Request
Application: Salvage Operations, Underwater Construction
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Marine Lift Bag Puncture Resistant Surface Temperature Resistant Material Quick Deployment System

Marine Lift Bag Puncture Resistant Surface Temperature Resistant Material Quick Deployment System
Product Attributes
AttributeValue
Product NameUnderwater Lift Bags
MaterialTop Notch PVC Coating Fabric
ReinforcementNylon Fabric
Lifting Capacity200kg to 50 tons
FeatureSuperior Buoyancy
TypeParachute
Thickness0.4mm-2.5mm, or As Request
Layers1-6Ply, or As Request
ValveInflation and Pressure Release
ColorBlack, Yellow, Orange, or As Request
ApplicationSalvage Operations, Underwater Construction
Product 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 Study: 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
SpecificationDetails
Product NameUnderwater Lift Bags
Raw MaterialTop Notch PVC Coating Fabric
TypeParachute
Size500kg, 1000kg, 5000kg 10000kg, etc
Thickness0.4-1.2mm, or as request
ColorYellow, Blue, Black, etc
Density0.33-0.9g/cm3
Safety Factor7:1
AccessoriesValve, Inflatable Tube, Repair Material
OEMWelcome
Warranty3 Years
Tolerances+/- 0.03 on densities +/- 0.2 mm on thickness +/- 0 to +3mm on width +/- 0 to +3mm on length
Model Specifications
ModelLifting CapacityDimensions [mm]Approx. Weight [kg]
HM-ULB01200 kg441 lbs8005
HM-ULB02500 kg1,103 lbs1,0008
HM-ULB031,000 kg2,205 lbs1,30011
HM-ULB042,000 kg4,410 lbs1,60020
HM-ULB054,000 kg8,820 lbs2,00050
HM-ULB066,000 kg13,230 lbs2,30066
HM-ULB078,000 kg17,640 lbs2,50075
HM-ULB0810,000 kg22,050 lbs2,70080
HM-ULB0915,000 kg33,075 lbs3,100110
HM-ULB1020,000 kg44,100 lbs3,400130
HM-ULB1130,000 kg66,150 lbs3,900170
HM-ULB1250,000 kg110,250 lbs4,600220
HM-ULB1370,000 kg154,350 lbs5,200310
HM-ULB14100,000 kg220,500 lbs5,800450
HM-ULB15150,000 kg330,750 lbs6,600660
HM-ULB16200,000 kg441,000 lbs7,300900
*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.
Frequently Asked Questions
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.
Product Images
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