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Joint Zone OPB-1100 Open Bottom Parachute (Lifts 1100 lbs)
Product code: 141460
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Open Bottom Lift Bags
Shop or rent underwater open-bottom lift bags from RTO for commercial diving, marine salvage, recovery, construction, and underwater lifting.
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Product code: 141460
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Product code: 141461
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Product code: 141462
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Product code: 141463
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Product code: 141464
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Product code: 141465
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Product code: 142716
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Especially suited for remote locations or for deployment from small craft.
SUBSALVE USA Commercial Lift Bags are capable of being used by a single diver. These heavy-duty lift bags are ideal for use in light salvage, object recovery, construction, and scientific applications. Designed to be portable, yet tough enough to last a lifetime.
Manufactured from heavy-duty nylon fabric coated with urethane for:
The Commercial Lift Bags have 6000 lb. rated strength, resin-treated nylon lift straps sewn directly to the bottom of the lift bag, and has a safe working ratio of 6:1.
The Subsalve USA Professional Lift Bag began with a one-of-a-kind assignment from the US Navy to develop a flotation device that would dependably withstand particularly abusive conditions. Subsalve developed the 5-ton Deep Ocean Lift Bag which had unprecedented strength, low elasticity and superior resistance to abrasion and chemical attack. This bag is now their standard Professional Lift Bag design. Their most versatile and easy-to-use lift bags. Similar in shape to an inverted water droplet at the moment of breakaway, this unique design provides maximum lifting capacity with the least total bag weight. It also provides an even distribution of stress over the fabric surface. These open-bottom, balloon-shaped bags with a single attachment point are easy to use in construction, heavy and light salvage, and many offshore tasks. Provides maximum lifting capacity with the least total bag weight. Manufactured from heavy-duty, ballistic-rated nylon fabric coated with urethane. This specially-coated fabric is:
All SUBSALVE USA Professional Lift Bags are equipped with easy-to-operate fill and dump valves on the top of the lift bag.
Each bag leaves the manufacturing facility equipped with all necessary hardware and is ready for immediate use. Each SUBSALVE USA Lift Bag is tested prior to shipping, and must meet rigorous U.S. Department of Defense requirements.
Helpful answers
Open bottom lift bags are used for lifting objects from deeper water where controlled air expansion is required. Open bottom lift bags, often called parachute lift bags, are designed for underwater lifting operations where air expands significantly during ascent. Their open design allows excess air to vent naturally, making them ideal for deep-water salvage, recovery, and offshore construction work.
Open bottom lift bags work by trapping air inside the bag while allowing excess air to escape as it expands during ascent. Air is introduced into the bag from below, where it is captured to create buoyancy. As the load rises and pressure decreases, the expanding air vents out through the open bottom. This helps maintain a more controlled lift in deeper water.
They are preferred because they safely manage air expansion during ascent. At greater depths, compressed air expands rapidly as it rises. Open bottom lift bags allow this expansion to vent naturally, reducing the risk of over inflation and improving control during lifting operations. This makes them well-suited for deeper underwater recovery work.
Yes, open bottom lift bags are commonly used for large and heavy underwater lifting operations. Their design allows them to handle significant lifting capacities, especially in deep-water environments. Multiple bags can be used together to distribute weight and maintain control when lifting large or irregular loads.
Open bottom lift bags vent air during ascent, while enclosed lift bags retain air for more controlled buoyancy and lifting. Open bottom lift bags are designed for dynamic lifting where air expansion must be managed. Enclosed lift bags provide more stable, controlled buoyancy and are typically used in shallower or more controlled underwater environments.
Use an appropriate design and rigging safety factor, inspect the bag and hardware before use, control inflation, keep personnel clear of the load path, and follow the manufacturer's instructions for inflation pressure, attachment, and capacity.
Some open bottom lift bags are available for rent from RTO. Rental availability depends on size and model, so confirm the required capacity, accessories, delivery lead time, and return requirements before scheduling the work.