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Introduction Every year, Unique Seaflex gets involved in supplying our Mono Buoyancy Units for more and more HDPE pipeline projects around the world. Because HDPE pipe is intrinsically buoyant, and offers more than enough reserve buoyancy to support the concrete collars when the ends are capped, it may not always be apparent that the use of additional buoyancy units can be a vital part of this process when it comes to the easy positioning and joining of multiple pipe strings. So underneath we provide an illustrated guide to this process. Unique Seaflex have more than 20 years’ experience of supplying inflatable buoyancy solutions for offshore engineering projects – most notably where pipeline crosses shore, either afloat or pulled along the bottom. Our experience of such projects is vast, and allows us to not only supply industry leading buoyancy bags with all necessary accessories but also to work with our clients from design engineering stage to optimize the specification of the buoyancy and the rigging as well as to jointly develop the methods to ensure the most efficient use of our equipment within the project. If required, we can also provide BOSIET-ticketed technicians to assist with the correct and most efficient use of our equipment on the project. Our client list is long, and within it you will find many of the most prominent names in offshore contracting. All our bags are designed and manufactured in full compliance with IMCA D-016 guidelines, and those units we can drop-test come with type test certificates proving that they meet the required 5:1 factor of safety. Within our rental pool, all bags are inspected, tested and recertified between each and every job, and each bag comes with it’s own logbook demonstrating that servicing regime and also providing full traceability down to component level for our customers’ peace of mind. Overview Further on within this application note you will find some schematic drawings to demonstrate how Seaflex bags can be rigged, deployed and then vented and retrieved after touchdown. Seaflex bags are suitable for use on projects where the pipe is being pulled into shore or pulled out from shore, floated into shore or floated out from shore. They are suitable for use through cofferdams on the shore or to assist with positioning on HDD projects. They are used on conventional rigid oil and gas pipe, as well as on HDPE intake and outfall pipes. They can be rigged to accommodate piggy-back arrangements. They can be secured to pass through a stinger without risk of fouling. We also offer the patented Kraken system of continuous buoyancy with low profile, particularly suited to ultra-shallow work such as through swamps. In short, there are not many pipeline landing projects for which Seaflex buoyancy is not suitable. In terms of attachment, the preferred method is the use of simple choked round slings, but if these cannot be fitted at a joint recess and abrasion is a concern (ie in the event of a bottom pull) then clients have simply used steel bands to fit a d-ring or similar to the top of the pipe, onto which our buoyancy units can then easily be shackled. Each project will have its own set of parameters and its own ideal solution in terms of rigging the bag and in terms of how best to fill and then vent the bags – and Seaflex are able to consult with the client to agree the best solution for the specific combination of pipe, location and intended method. www.uniquegroup.com 1PDF Image | Use of Buoyancy for Installation of HDPE
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