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Welcome you visit DOOWIN

Chinese Pioneer and Leader
Largest Professional Manufacturer

The Chinese largest professional manufacturer of water weight bags, lifeboat test water bags.
DOOWIN is the unique professional manufacturer of underwater air lifting bags, pipeline buoyancy bags, marine salvage airbags.

Load Test Water Bags

Underwater Air Lift Bags

Pipeline Buoyancy Units

Lifeboat Test Water Bags

Liquid Containment

Inflatable Products

Water Weights Proof Load Bags

September 28th, 2018|Comments Off on Water Weights Proof Load Bags

World’s First Seabed Flexible HDPE Pipe Double-tube Installation

July 12th, 2018|Comments Off on World’s First Seabed Flexible HDPE Pipe Double-tube Installation

Potable Water Pillow Tanks

June 15th, 2018|Comments Off on Potable Water Pillow Tanks

Low Headroom Crane Load Test

May 15th, 2018|Comments Off on Low Headroom Crane Load Test

DOOWIN Load Test Water Weight Bags

Highest Performance Water Bags Certificated

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

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Maximum Capacity Water Bag
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Crane Test Water Bags

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

Low Headroom Weight Bags

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

Platform Test Water Bags

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

Wireless Load Cell

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

How to choose the best quality water bags?

Type Certificated by Drop Test
Comply with LEEA 051

DOOWIN load test water bags are designed manufactured, tested and certificated in 100%
compliance with LEEA 051 guidelines. There are several key elements.

  • Lifting set should separate from water bags. Comprised several elements should share
    the load. Each element should be manufactured comply with relevant BS standard.
  • The safety factor of each type and size water bags should be proven via drop
    test to at least 6 times the working load limit.
  • Every water bags should be verified via either inflation of the water bags to
    pressure in the range to 0.25~0.5 bar and then visual check of welded seams
    for integrity and no leakage, or via a proof (drop) test to at least 2 times the WLL.

Chinese Unique Professional Manufacturer

Underwater Air Lift Bags

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

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Maximum Capacity Each Airbags

Parachute Type Air Lifting Bags

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

Totally Enclosed Air Lift Bags

Best buoyancy load for the surface
buoyancy support & pipeline laying work
Standard Capacity: 50kg ~ 50t

Pillow Type Air lifting Bags

Provide maximum lift capacity for the
reflation work, towing job in shallow water
Standard Capacity: 100kg ~ 5t

Elongated Pontoon

Raise the sunken boat from deepwater
supporting docks and floating structures
Standard Capacity: 500kg ~ 5t

Professional Inflatable Floats for Pipelaying Work

Pipeline & Cable Buoyancy Units

We manufacturer various buoyancy units for different pipe laying, cable float, hose floats.
Our single point buoyancy bags are drop tested with 6:1 safety factor by BV.

Single Point Buoyancy Bags

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

Individual Buoyancy Bags

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

Twin Inflatable Buoyancy Bags

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

Marine Rubber Airbags

Heavy duty salvage rubber airbags
the toughest inflatable buoyancy airbags
Standard Capacity: 5t ~ 300t

Made of Highest Quality PVC Coated Fabric Material

Lifeboat Test Water Bags

DOOWIN lifeboat test water bag system including professional highest quality water bags,
professional operation fittings, like diaphragm pump, water meter, manifold.

Lifeboat Test Water Bags

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

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 Test Kits

Professional lifeboat water bags test system
for better and more easily operateion
diaphragm pump, water meter, manifold
discharge/filling hose, ball valves

Professional Cast Quality

Excellent quality water bags and reliable service, they deliver exactly what they agree to and perfectly on time.

Stephen Barnett, MODEC (Singapore)

Awesome to use DOOWIN buoyancy bags for our Aramco project. Its quality completely can be comparable with UK products.

Dr.Chen, China Harbour (Aramco Project)

We have confident with DOOWIN. They can help us with innovative solution, well prepared to accommodate to our request.

Hugo Silva (Project Manager), McDERMOTT