Buoyancy Bags are highly reliable inflatable lifting systems
designed to provide precise control and stability for underwater
lifting, positioning, and recovery operations. Constructed with
reinforced synthetic fabrics and heavy-duty elastomeric coatings,
these bags offer exceptional durability, puncture resistance, and
long-term performance even under challenging marine conditions.
Each unit is fitted with load-tested stainless steel lifting
points, automatic pressure relief valves, and high-visibility
coatings for maximum operational safety. The internal structure is
engineered to distribute load evenly, ensuring that lifting forces
remain balanced and controlled throughout every stage of the
operation.
Buoyancy Bags are widely recognized for their simple setup, fast
deployment, and ease of use underwater, making them an essential
tool for offshore contractors, diving teams, and marine
construction companies. Their design minimizes the risk of
uncontrolled ascent, while the self-regulating buoyancy system
ensures smooth and predictable lifting performance.
Case Study: Subsea Pipeline Replacement Project
In 2024, an offshore energy company faced a challenge in replacing
a damaged section of a 40-meter subsea oil pipeline. The section,
weighing nearly 6 tons, was resting 30 meters below the surface and
required careful lifting to avoid bending or stressing adjacent
pipeline joints.
A team equipped with Hongruntong Marine’s Buoyancy Bags carried out
the operation. Six units, each rated for 1-ton lift capacity, were
distributed evenly along the pipeline section and connected using
certified synthetic slings. Inflation was conducted in a
synchronized manner from the surface, monitored via pressure gauges
and depth sensors.
The controlled lift allowed the pipeline section to rise gently off
the seabed and maintain a stable, horizontal orientation throughout
the process. Divers then guided the section into alignment with the
replacement module. The entire operation was completed in under two
hours, without structural distortion or environmental disturbance.
This project demonstrated the precision control, ease of
coordination, and superior stability of Buoyancy Bags in subsea
engineering tasks requiring both accuracy and safety.
Reinforced Structural Integrity
Buoyancy Bags are made with multi-layer synthetic fabrics coated
with high-performance elastomers, ensuring exceptional tear and
puncture resistance. The welded seams and reinforced attachment
points provide long-lasting structural strength under repeated
pressure cycles.
Automatic Pressure Regulation
The integrated pressure relief valve system maintains consistent
internal air volume, preventing over-pressurization during ascent.
This automatic control mechanism enhances safety and ensures
smooth, stable lift performance.
Simplified Deployment and Handling
Lightweight and compact when deflated, Buoyancy Bags can be
deployed quickly even in confined or deep-water environments. The
system allows for single-diver setup, reducing operational time and
improving field efficiency.
Long Term Reliability and Low Maintenance
All components are engineered for extended operational life with
minimal maintenance requirements. The corrosion-resistant fittings
and flexible coating materials withstand UV exposure, saltwater,
and repeated inflation cycles.
Applications
Pipeline and Cable Operations
Buoyancy Bags provide stable lift for subsea pipelines, umbilicals,
and communication cables during installation, inspection, or
replacement. The controlled ascent prevents torsion or bending.
Offshore Construction Support
Used to handle structural frames, risers, and foundation elements
during marine construction, Buoyancy Bags enable precise underwater
alignment and temporary support.
Salvage and Recovery Operations
Suitable for lifting sunk vessels, anchors, and subsea tools, the
system offers gradual lift and stable flotation, minimizing risk to
equipment and personnel.
Why Choose Hongruntong Marine
Decades of Marine Engineering Experience
Hongruntong Marine integrates extensive engineering expertise and
in-house R&D capability to deliver buoyancy solutions that meet
the highest offshore and diving industry standards.
Tailor Made Design Solutions
We offer custom-engineered Buoyancy Bags in various capacities,
shapes, and attachment configurations. Each unit is optimized for
the customer’s specific operational needs, from shallow-water
maintenance to heavy offshore recovery.
Uncompromised Quality Assurance
Every bag undergoes load testing, air retention inspection, and
valve integrity verification before delivery. Our ISO
9001:2015-certified facilities ensure consistent quality and
performance reliability.
Dedicated After Sales and Field Support
Hongruntong Marine provides comprehensive technical assistance,
including on-site setup training, operation guidance, and
maintenance consultation. Clients benefit from 24/7 global support
and fast replacement services.
FAQ
Q1: How do Buoyancy Bags differ from other lifting systems?
A: They provide precise, controlled lift through self-regulating
buoyancy, making them safer and more stable for subsea recovery
than rigid or crane-based methods.
Q2: What materials are used in their construction?
A: High-tensile synthetic fabric coated with polyurethane or
neoprene, reinforced with welded seams and corrosion-resistant
fittings.
Q3: Are these bags suitable for repeated operations?
A: Yes. They are designed for multiple deployments with proper
inspection and maintenance between uses.
Q4: What maintenance procedures are required?
A: Regular inspection of seams, valves, and lifting points;
cleaning after saltwater exposure; and storage in a cool, dry area
to prevent material aging.
Q5: Can Hongruntong provide on-site deployment assistance?
A: Absolutely. Our technical team can support on-site installation,
operational training, and safety guidance worldwide.
