Unique Group's Seaflex? Buoyancy Bags: Advantages and Applications
Unique Group’s Seaflex? Buoyancy Bags: Advantages and Applications
Whilst most used for the laying of pipelines, whether being pulled from shore or being deployed from a lay barge’s stinger, Seaflex? buoyancy bags are also commonly used for the lifting of pipelines from the seabed in conjunction with derricks or winches for tasks such as Above Water Tie Ins (AWTIs) or for repair or retrieval operations.
Typically, parachute-style Air Lifting Bags (ALBs) are used for general lifting projects in diving operations and salvage projects because their open undersides allow the increasing volume of air within generated by the ascent through the water column to freely vent – preventing damage to the bag from an overload of the pressure release valves (PRVs) fitted to all enclosed types of bags.
However, certain scenarios exist where an enclosed bag –one of our Mono Buoyancy Units (MBUs) or Inflatable Buoyancy Units (IBUs) - is the perfect solution for lifting pipelines.
AWTIs typically make use of our IBUs because the bags sit horizontally to the pipeline bringing it closer to the surface. However, some customers prefer our MBUs for this purpose, as their single point of connection makes for simpler rigging and quicker connection/disconnection from the pipeline.
They are normally taken down by divers and positioned while the pipeline sits on the seabed. They are then inflated via air lines from the surface when lifting commences. Because AWTIs are invariably under the control of the vessel’s davits, the rate of ascent is managed to minimize the risk of the units surfacing too quickly.
At the end of the AWTI, the IBUs are used to assist with re-positioning the pipeline onto the seabed, because the air inside them is compressed during the descent the air lines at the surface are used to replenish them as required.
Following the touchdown, the IBUs are easily vented through the air lines using differential pressure. Divers are then safely able to release the bags with a small air charge allowing them to float to the surface for retrieval.
Most AWTIs involve bringing a pipeline up on davits alongside a barge. However, our bags have been used on projects where the pipeline is retrieved back up the stinger.
This type of operation will generally involve positioning the end of the stinger over the end of the pipeline (on the seabed) and passing a winch wire down through the stinger before divers take it down to the end of the pipe to then recover the pipe back up the stinger with the aid of buoyancy.
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Note: When engaging in any lifting or buoyancy operation, it is essential to consult with experts, follow safety guidelines, and adhere to industry best practices to ensure successful and secure operations.
The ascent rate must be very carefully monitored. Given the operational risks involved, the factor of safety is critical. Trust in our project engineering experience and guidance, along with onsite support from a Seaflex? technician if required.
The bags are immediately available for rental or purchase from the world’s largest stock of such equipment. If rented, our equipment is subject to the highest testing and re-certification standards in the industry.
The company’s safety culture was borne of constant risk identification and a long-standing commitment to collaboration with our customers. Its Integrated Management Systems are certified to ISO 9001, 45001, and 14001 Standards. Highly important when delivering our uncompromising service and forward-thinking solutions.
Unique Group’s Seaflex? buoyancy bags offer a reliable and efficient solution for underwater lifting and pipeline laying operations. Their enclosed design, combined with the use of high-quality materials and rigorous manufacturing standards, ensures their durability and safety in demanding marine environments. The advantages of Seaflex? buoyancy bags include ease of rigging, controlled ascent and descent rates, lightweight construction, and availability for rental or purchase from a reputable manufacturer. With comprehensive certification, attentive service, and dedicated support, Seaflex? remains committed to delivering innovative solutions for buoyancy challenges in the marine industry.
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Learn more: https://www.uniquegroup.com/product-category/buoyancy-water-weights/pipe-lay-buoyancy-water-weights/