Single-point buoyancy units are one-kind enclosed pipeline buoyancy bags. They only have one single lifting point, so they are very effective for steel or HDPE pipeline laying work at or near the surface. Moreover, they can also work at a large angle, like parachute-type air lift bags.
Vertical single-point buoyancy units are made of heavy-duty PVC coating fabric material that complies with IMCA D-016. Each enclosed mono buoyancy bag is fitted with pressure relief valves, and filling/discharge ball valves. One internal strop is used to connect the top lifting point with the bottom lifting point. We also can make lifting belts from the top to the bottom to reinforce the lifting capacity.
DOOWIN makes mono buoyancy bags with a capacity of less than 5ton. For the bigger capacity, you can choose our parachute air lift bags.
Made of heavy duty PVC coated polyester fabric. The strength of the thicknest material is 10,000N/5cm.
Relief valves can open automatically to release inside pressure to prevent burst.
Drop testing proven safety working factor 5:1 at least over IMCA D016.
Mono buoyancy units have only one single lifting point for big-angle work. They are easy to connect and release.
DOOWIN single point mono buoyancy bags have 500kg, 1t, 2t, 3t, 5t and 10ton common size. The standard color is yellow. The orange color is available upon request. Refer to the below pictures, we also can design and supply upon clients’ request, and special projects.
Model | Capacity | Diameter | Length | Dry Weight |
|---|---|---|---|---|
SPB-500 | 500 kg | 800 mm | 1,100 mm | 15 kg |
SPB-1 | 1,000 kg | 1,000 mm | 1,600 mm | 20 kg |
SPB-2 | 2,000 kg | 1,300 mm | 1,650 mm | 30 kg |
SPB-3 | 3,000 kg | 1,500 mm | 2,300 mm | 35 kg |
SPB-5 | 5,000 kg | 1,700 mm | 2,650 mm | 45 kg |
SPB-10 | 10,000 kg | 1,800 mm | 4,000 mm | 100 kg |
Note: The specification is only for your reference. We may change its size without notice.
DOOWIN single-point buoyancy units are type-certified through drop testing. They have proven a safety factor of over 5:1. Our single-point buoyancy units are manufactured and tested in compliance with IMCA D016. We can provide third-party BV, ABS, and LR certificates upon request.
We also performed the burst test for the SPB-5T and SPB-10T mono buoyancy units. Their burst pressure is more than 5 times the working pressure.
Feb 2025 — The Saudi Arabian Jizan Industrial City Seawater Cooling Project, undertaken by China Harbour Engineering Company and participated in by CCCC Fourth Harbor Engineering Bureau Co., Ltd., has completed the shipment and installation of high-density polyethylene (HDPE) pipelines in unprotected waters. The total length of the HDPE pipeline installed in the project is about 6,600 meters, and the pipeline diameter reaches 3.5 meters. It is currently the largest submarine HDPE pipeline installed in the world.
June 2016 – The Saudi Arabian Jizan JIGCC drainage project has successfully installed a 3-meter diameter submarine HDPE pipeline. The flexible HDPE submarine pipeline with a length of 558.2 meters and a weight of1,315 tons was commercialized at the commercial port of the Saudi Arabian Sea City. It successfully adopted double-tube shipping to achieve seamless underwater docking and became the world’s first super-flexible HDPE submarine pipeline. Double pipe shipment installation. The Second Engineering Company of CCCC Fourth Harbor Engineering Co., Ltd finished this project.
DOOWIN is committed to providing high quality proof-load testing water weight bags and air lifting bags for our customers worldwide.
Inflatable buoyancy units can be used for surface marine salvage, pipe-laying buoyancy floats, and vessel draught reduction.
Twin-boom and twin-chamber design are used for small diameter pipeline, cable and hose laying.
Continuous inflatable tube can provide continuous buoyancy support for pipe laying and cable laying.
Inflatable cable and pipeline floats are ball-type design for small-diameter cable and pipeline laying.
We provide professional pipe laying and cable laying solution with our inflatable buoyancy units. Various inflatable buoyancy bags are used for pipe lay, cable lay, pipeline shore landing, and cable shore landing.
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