We currently manufacture multi-type underwater lift bags, with each design having its specific purpose. Underwater lift bags include the follows: open bottom parachute type lift bags, totally enclosed parachute lift bags, cylindrical enclosed air lift bags, pillow type lift bags, enlongated type air lifting bags, pipeline buoyancy bags, and other customer type lifting bags.

Underwater air lift bags are fabricated from heavy duty polyester cloth coated with PVC coating fabric. Manufactured and certificated comply with IMCA D016 "Underwater Air Lift Bags" 2007. 

Please refer the simple introduction of two kind mian underwater air lift bags: parachute type lifting bags with an open bottom skirt, totally enclosed lifting bags. 

Parachute Type Lifting Bags

DooFlex Open Bottom Parachute Type Lifting Bags is designed with water drop shaped units, which is widely used for buoyancy support or lifting sunken objects operation of underwater diving work. The open bottom design make the operation more safety. It's one kind of very useful floataion device for the diving salvage, underwater salvage, and underwater buoyancy support and refloatation.

Each parachute type lift bags is equipped with manual air dump relief/dump valve, which can be controlled easily to change the buoyancy by the bottom rope. And certificated heavy duty polyester webbing with end shackles, and air inlet stainless/ brass ball valves are equipped for the lifting operation. Each parachute lifting bag is complete and ready for use when leaving our manufacturing facility.

Totally Enclosed Lfiting Bags

Totally Enclosed Lifting Bags (Salvage Tube, Inflatable Buoyancy Bags) is one kind effective alternative of Open Bottom Parachute type lifting bags for the surface buoyancy support operation. 

Totally Enclosed Lifting Bags can be used for buoyancy support and refloatation operation in shallow water and on the surface, support/salvage pontoons for bridges, floating platforms, dock gates,  sunkend objects or military equipment. Totally enclosed lifting bags offer an effectual method of reducing the draught of vessel and floating underwater structures. Then also provide an ideal system of buoyancy for cable and static buoyancy support.

Totally Enclosed Type air lifting bags are cylindrical shaped units, fabricated from heavy duty polyester cloth coated with P.V.C, completely equipped including the appropriate quantity of automatic air relief valves, certified heavy duty polyester webbing with shackles (with safe working factor 6:1), and air inlet stainless/brass ball valves.

Generally only open bottom parachute bags should be used where any form of ascent is planned or possible, such as vessel salvage or raising objects from the seabed. Fully enclosed bags should not be used for this purpose. However some totally enclosed parachute and cylindrical lift bags can be used for salvage down to depths of 30 metres.