DOOWIN Underwater Air lift Bags and Proof Load Testing Water Weight Bags
DOOWIN manufactures flexible solutions using heavy-duty polyvinyl chloride (PVC) or thermoplastic polyurethane (TPU) coated fabric.
Marine lifting equipment for offshore applications
DOOWIN offers a range of underwater salvage lifting bags, pipeline buoyancy units, proof load test water-filled weight bags, and bulk packing solutions.
All products are designed and tested to comply with International Marine Contractors Association (IMCA) D-016 and Lifting Equipment Engineers Association (LEEA) 051, and have been certified by the American Bureau of Shipping (ABS), Bureau Veritas (BV), China Classification Society (CCS), and Lloyd’s Register (LR), as well as passing an ISO 9001 quality management system.
Proof load testing water-filled weight bags
DOOWIN’s water-filled weight bags are a simple, safe and cost-effective solution for lifting equipment and structures, such as static or dynamic load testing of davits, winches, cranes, lifting equipment, and beams.
The water weight bags have been drop-tested at the UK’s TUV National Engineering Laboratory, and gained type test accreditation at a 6:1 safety factor to meet LEEA Guidance 051.
All load test water weight bags are made from high-strength PVC-coated polyester, which incorporates radio frequency welding. Each water weight bag is equipped with certificated shackles, master-link, and webbing straps, and complies with relevant international standards.
Each water weight bag is tested and certified before delivery. In addition, DOOWIN also provides third-party certificates from organisations such as BV and ABS.
Heavy-duty underwater air lifting bags
DOOWIN’s underwater air lifting bags include parachute-type lifting bags, enclosed lifting bags, elongated inflatable buoyancy bags, pillow-type air lift bags, single-point buoyancy bags, and other customised air lift bags.
Heavy-duty air-inflated underwater air lifting bags are used worldwide for raising sunken objects; marine salvage, structure stabilisation and re-floatation; vessel salvage; transportation of underwater equipment; pipeline and equipment towing; as well as standby emergency buoyancy.
All DOOWIN underwater air lifting bags are manufactured and certified to comply with IMCA D-016 Guidelines.
Parachute-type air lifting bags
DOOWIN parachute-type air lifting bags are available in open-bottom and enclosed variations.
The company’s open-bottom parachute-type air lifting bags are widely used for lifting loads or lift sunken objects from the seabed to the surface, and as a floatation device for diving and underwater marine salvage, as well as for underwater buoyancy support and re-floatation. Enclosed parachute-type lifting bags have a dual-purpose bottom, and can be used in shallow and deep waters.
DOOWIN parachute-type air lifting bags are fabricated from high-tenacity PVC-coated polyester fabric. They are equipped with a manual air dump relief valve, which can be easily controlled to adjust the buoyancy of the bottom rope. They also feature certified heavy-duty polyester webbing with end shackles, and air inlet stainless valves are supplied for the lifting operations.
The parachute-type air lifting bags are manufactured to comply with IMCA D-016 guidelines.
Totally enclosed air lifting bags
Cylindrical, totally enclosed air lifting bags are an effective alternative to parachute-type air lift bags for surface buoyancy support, re-floatation, marine salvage, cable, or for pipeline laying as inflatable buoyancy units.
The totally enclosed air lifting bags are cylindrical units made with heavy-duty PVC-coated polyester, and feature polyester webbing with shackles, air inlet stainless ball valves, and automatic air relief valves. The overall assembly has a minimum 5:1 safety factor for its working load.
All DOOWIN air lift bags are manufactured and certified to comply with IMCA D-016.
Lifeboat testing water bags
The cylindrical DOOWIN PVC-coated lifeboat testing water bags are equipped with fill / discharge fittings, handles and an automatic relief valve, which is activated once the bags achieve the specified weight.
This water bag system is widely used for the distributed proof load testing of lifeboats, crew bastes, gangways and small bridges.
Inflatable pipeline buoyancy units
DOOWIN inflatable pipeline buoyancy units have three main products; namely cylindrical shape enclosed air lift bags, and single-point vertical or twin-inflatable buoyancy bags.
The pipeline buoyancy units are used for the buoyancy support for cable, or pipeline installation or towing.
DOOWIN's partner Headway Technology has undertaken a boat-lift proof-load testing project using water-load testing weight bags at Destini Shipbuilding Malaysia.Read more
DOOWIN proof load test water weight bags have been drop-tested at the TUV National Engineering Laboratory, and gained type test accreditation at the 6:1 safety factor to meet LEEA Guidance 051.Read more