Hongruntong Marine Buoyancy Bags are industrial underwater lifting systems developed for subsea construction, marine civil engineering, offshore maintenance, and underwater recovery operations requiring stable load handling performance under complex underwater working conditions.
The product is engineered using reinforced multilayer synthetic fabric combined with high-strength internal load-support assemblies, providing controlled buoyancy output and structural stability during heavy-duty marine lifting procedures.
A large-scale bridge rehabilitation project in South America required underwater replacement of submerged steel reinforcement assemblies. The engineering contractor faced operational restrictions due to the bridge remaining active throughout the rehabilitation program.
Hongruntong Marine Buoyancy Bags were selected to support underwater lifting and stabilization operations. Commercial divers installed multiple buoyancy units around designated lifting points, allowing controlled inflation procedures that reduced structural load pressure and improved handling precision.
The buoyancy system reduced operational interruption duration and minimized the requirement for large offshore support vessels. Project supervisors reported strong abrasion resistance despite repeated contact with submerged concrete surfaces and steel reinforcement edges.
| Product Name | Buoyancy Bags |
| Raw Material | PVC coating fabric |
| Type | Cylindrical |
| 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 |
| Tolerances | ±0.03 on densities, ±0.2mm on thickness, ±0 to +3mm on width, ±0 to +3mm on length |
| Model | Buoyancy (kg) | Buoyancy (lbs) | Diameter (mm) | Length (mm) | Weight (kg) |
|---|---|---|---|---|---|
| HM-ULB01 | 200 | 441 | 500 | 1,000 | 5 |
| HM-ULB02 | 500 | 1,103 | 800 | 1,000 | 8 |
| HM-ULB03 | 1,000 | 2,205 | 1,000 | 1,500 | 11 |
| HM-ULB04 | 2,000 | 4,410 | 1,300 | 1,500 | 20 |
| HM-ULB05 | 4,000 | 8,820 | 1,600 | 2,000 | 50 |
| HM-ULB06 | 6,000 | 13,230 | 2,000 | 2,000 | 66 |
| HM-ULB07 | 8,000 | 17,640 | 2,000 | 2,600 | 75 |
| HM-ULB08 | 10,000 | 22,050 | 2,400 | 2,400 | 80 |
| HM-ULB09 | 15,000 | 33,075 | 2,600 | 3,000 | 110 |
| HM-ULB10 | 20,000 | 44,100 | 3,000 | 3,000 | 130 |
| HM-ULB11 | 30,000 | 66,150 | 3,000 | 4,500 | 170 |
| HM-ULB12 | 50,000 | 110,250 | 4,000 | 4,000 | 220 |
| HM-ULB13 | 70,000 | 154,350 | 4,000 | 5,700 | 310 |
| HM-ULB14 | 100,000 | 220,500 | 4,000 | 8,000 | 450 |
| HM-ULB15 | 150,000 | 330,750 | 5,000 | 8,000 | 660 |
| HM-ULB16 | 200,000 | 441,000 | 5,000 | 10,000 | 900 |
