Underwater Lift Bags & Water Filled Weight Bags

China Pioneer and Leaders

DOOWIN is Chinese unique professional manufacturer of underwater air lift bags, inflatable buoyancy bags, and water filled weight bags. Our inflatable buoyancy bags are used for the marine salvage, buoyancy support pipeline laying work. All our inflatable buoyancy bags are fully compliant with IMCA-D-016. DOOWIN water filled weight bags are manufactured and tested comply with the requirements of LEEA 051. DOOWIN equip the modern professional production machine, use the market leading material, and advanced production technology to manufacture high-quality products.

DOOWIN engineers and consultants have been in fabrication and use these products for more than 30 years, experienced in this industry. DOOWIN passed rigorous ISO 9001 Quality Management System, approved by the third party SGS, CCS, BV, ABS, LR.

DOOWIN Certificate LOGO
water filled weight bags

Load Test Water Weight Bags

pipeline inflatable buoyancy bags

Pipeline Buoyancy Bags

Liquid Containment pillow type water bags

Liquid Containment

Parachute type inflatable buoyancy bags

Underwater Air Lift Bags

Lifeboat water filled weight bags

Lifeboat Test Water Bags

inflatable fenders buoys and pipe plug

Other Inflatable Products

Water Filled Weight Bags

DOOWIN load test water filled weight bags are manufactured with the highest quality PVC coating fabric. Our load test water filled weight bags are type certificated by drop test, which proven factor of safety in excess of 6:1. DOOWIN Water filled weight bags are manufactured and tested comply with LEEA 051 Guidance, BV, LR , ABS certificated.

water filled weight bags

Water Weight Bags

Used for the proof load testing
for crane, derricks, davit, and
any lifting or load-bearing structure
Lifting Capacity 1~100ton

low headroom water filled weight bags

Low Headroom Weight Bags

For lifting equipment & structures
when testing has low headroom
Standard lifting capacity 1~35t
Customized size available

deck load test water bags

Deck Load Test Weights

Load testing all kinds of load-bearing
structures, including bridge, platform,
walkway, floor, elevators, ramps
gangways, decks, and entire buildings.


Wireless Load Cell

It is the necessary dynamometer
the instrument for the load testing
with water filled weight bags
Standard capacity 1~300ton

Underwater Air Lift Bags

All DOOWIN underwater air lift bags are designed, manufactured and tested compliance with IMCA D016. We have various type of air lifting bags made of high-quality PVC coating fabric material with 6:1 Safety Factor.

underwater lift bags

Parachute Type Air Lift Bags

Used for lifting sunken objects and
other loads from the seabed to surface
Lifting Capacity: 50kg ~ 50t

marine salvage airbags

Marine Salvage Bags

Best salvage airbags for the
marine salvage and re-floatation.
Standard Capacity: 50kg ~ 50t

pillow lift bags

Pillow Type lift Bags

Provide maximum buoyancy for the
float bag salvage in shallow water
Lift Capacity: 100kg ~ 5t

marine salvage float bags

Float Bags Salvage Tube

Raise the sunken boat from deepwater
supporting docks and lift bag salvage
Buoyancy Capacity: 500kg ~ 5t

Pipeline Inflatable Buoyancy Modules

We manufacturer various inflatable buoyancy units for different pipe laying, cable float, hose floats. Our single point inflatable mono buoyancy units are drop tested with 6:1 safety factor by BV. Inflatable buoyancy bags are manufactured in compliance with IMCA D016.

Single point inflatable buoyancy bags

Single Point Buoyancy Bags

Single point can work at large angle
Mono Buoyancy Units
Air Lift Capacity: 500kg ~ 5t

individual inflatable buoyancy bags

Individual Buoyancy Bags

Used for the pipe laying work
Multi lifting points, light weight
Buoyancy: 50kg ~ 50t

Twin inflatable buoyancy bags

Twin Inflatable Cable Floats

Professional inflatable floats for the
small diameter cable, hose, pipe
Standard Capacity: 100kg ~ 2t

marine rubber airbags

Marine Rubber Airbags

Heavy duty salvage rubber airbags
the toughest marine salvage airbags
Buoyancy: 5t ~ 300t

Lifeboat & Davit Load Test Water Weight Bags

DOOWIN lifeboat water-filled weight bags system including professional highest quality water bags,
professional operation fittings, like diaphragm pump, water meter, manifold.

Lifeboat test water filled weight bags

Lifeboat Test Water Bags

Professionally designed water bags
with an air valve, relief valves, and hands
Standard Capacity: 100kg ~ 1ton
Customised size available

Gangway test water filled weight bags

Gangway Test Water Bags

Used for the load testing of gangway
accommodation ladder and other long structures
Standard capacity: 650kg, 13000kg
Customized size avaliable

lifeboat davit load test water bags

Lifeboat Davit Load Test

Professional davit load test water bags
for better and more easily davit load test
Standard Capacity: 1t ~25ton
Customized size and shape available

Water Bladder Tanks

pillow water tanks

Liquid Pillow Tank

Pillow tanks are used for bulk liquid storage and transportation for storing fuel, water and chemicals. We have rainwater tanks, fuel bladder tanks, potable water tank.


Open Top Water Tank

We have self-rising onion shape open top water tank, and frame type open top water tank used for water storage, firefighting, and disaster relief efforts. Onion water bladder tanks.

Other Inflatable Products


Inflatable Fenders & Buoys

DOOWIN make low pressure PVC fenders and buoys. This type PVC fenders are used for the boat, commercial boat, or yacht. Can be called yacht fenders.


Inflatable Pipe Plug

Inflatable pipe plug and inflatable pipe stopper made of heavy duty PVC coating fabric and rubber. Customized size is available upon request. Inflatable PVC pipe plug and stopper.

What products do you need?

Please contact our professional team!

Mobile: +86-185 5486 9267 (WhatsApp)
Email: sales@doowincn.com

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