OJS' patented Sea Sleeve® is a composite field joint infill system consisting of a High Density Polyurethane Foam (HDPFT) and a polyethylene sleeve outer cladding. The polyurethane foam is the core of the infill which fills the annular gap over the girth weld between concrete coated pipe ends.
Sea Sleeve® is wrapped around the concrete coated pipe. The longitudinal seam is then sealed by electric fusion welding rather than steel strapping and clips. This procedure has numerous advantages in that it provides a safer operation, has an infinite life span, and is more cost effective. Once the sleeve is secured on the pipe, the foam is injected into the annulus with the polyethylene sleeve serving as the mold. After the foam has been injected and is cured, the Sea Sleeve® is left in place as an expendable mould.
The resultant infill provides immediate mechanical support for the pipe joint as it passes over the stinger rollers and through the 'S' curve to sea bottom touch down. Sea Sleeve® will continue to provide impact protection for the pipeline long after its service life and can vary in thickness for increased impact or abrasion resistance.
Product Data Sheet
Sea Sleeve® (PDF 70KB)