DOOWIN is China’s leading professional manufacturer of underwater lift bags, marine salvage bags, and crane test water weight bags in complying with international standards IMCA D016 and LEEA 051. We also produce various inflatable pipeline buoyancy units, water or fuel storage bladder tanks, inflatable boat fenders and buoys, inflatable pipe plugs, and other flexible products made of PVC/TPU coating fabric.
Our underwater lift bags include open-bottom parachute type, totally enclosed type, pillow type, and other customized shapes. These air-lifting bags can be used for diving work, marine salvage and refloating operations, and pipeline layering buoyancy support. Our water weights bags can be used for the proof load testing for cranes, lifeboats, davits, and other lifting equipment. With a strong reputation for quality, DOOWIN is considered the first choice supplier by many key industry suppliers, contractors, and end-users.
Our engineers and consultants have been in the fabrication and use of these products for more than 30 years. DOOWIN has clients in Diving, Marine Rescue and Salvage, Energy and Oil, Offshore Shipping, and other industries all over the world. DOOWIN products passed rigorous ISO 9001:2008 Quality Management System, approved by the third party SGS, BV, CCS, ABS, LR, BV.
DOOWIN weight test water bags are dynamic drop test type certificated with 6:1 Safety Factor.
All our proof load bags and air lifting bags meet the standard LEEA 051 and IMCA D016.
Our weight bags passed the industry’s highest test standard – Drop Test.
Our airbags were tested in 20m water depth to get its actual buoyancy by Allseas.
We well know our products’ performance and burst pressure.
Proof load testing is the basic necessary test when performing the 3rd party certificate.
IMCA D016 is the international industrial standard for underwater lift bag. Our air lift bags are designed, manufactured and test comply with this standard.
LEEA 051 is the international standard of crane test water bags. It is explicit the requests for the elements of lifting set, drop test way and pressure test way to verify.
Our experienced engineers and workers design and manufacture qualified water bags and salvage bags. We create outstanding products always.
We use first-class extreme heavy-duty polyurethane-coated fabric. The advanced production technology and management system can help to control the cost well, to offer the client the best price.
DOOWIN is committed to providing high quality proof-load testing water weight bags and air lifting bags for our customers worldwide.
Critical for our offshore platform crane tests! The water weight bags handle extreme loads with no leaks, even in rough North Sea conditions. Saves us days of inspection and calibration.
Daniel from Netherlands
Project Director
Perfect for shipyard and deck cranes in Singapore. Lightweight design speeds up deployment, and the precise weight distribution ensures accurate load testing. A must have for large scale cranes.
John Zwiers from Singapore
Manager
Game-changer for our cranes! Durable in high humidity, and the lightweight construction reduces transport costs. Reliable performance in extreme conditons-highly recommended for Latin America.
Johny Amaral from Brazil
Project Director
There are our company’s catalogue, and some our brochures for different products.
With more than 10 years of industry expertise, we share many load-testing project achievements on this website.
Professional manufacturer of pneumatic fenders, marine rubber airbags, foam fenders, and offshore buoys.
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