Sea Sleeve, Intrafuse and HDPF - Mechanical Protection on CWC Pipelines

These three products are combined to provide mechanical protection to the anti-corrosion layer on field joints within concrete weight coated (CWC) pipelines. OJS' patented Sea Sleeve® is wrapped around the pipe at the field joint area and overlaps the CWC. The Sea sleeve length is longer than the circumference of the CWC and has a longitudinal overlap which is sealed by electric fusion welding (Intrafuse).  The High Density Polyurethane Foam (HDPF) is injected into the annulus (Infill) with the polyethylene sleeve serving as the mold. After the HDPF has cured, the Sea Sleeve® is left in place as an expendable mould.

The benefits of this OJS system are;

Densiflex 6100 Solid Polyurethane - Wet thermal insulation on pipelines

Solid polyurethane (SPU) is used to coat field joints on pipelines, risers, spools where wet thermal insulation is required.

SPU MATERIAL PROPERTY TESTING
COMPARISON OF OJS DENSIFLEX 6100 and HYPERLAST 439

OJS is pleased to present the results of intensive laboratory material property testing of our new Solid Polyurethane (SPU) material Densiflex 6100. The test protocol was established by Heerema/PTL in agreement with Marathon Oil. They were performed by an independent laboratory under simulated field applications and replicated using Hyperlast 439 material to provide a comparison for pipeline field joint applications.

OJS performed the material testing in February 2009 to establish suitability for pipeline field joint coating on the Marathon Droshky project in Gulf of Mexico Block GC 65. The flowline will be assembled at the new Subsea 7 spoolbase in Port Isabel on the Gulf of Mexico coastline, Texas, USA during Q3 2009.

In order to confirm suitability of Densiflex 6100, OJS applied three field joints onto a section of 8" dia pipe with GSPU parent coating. The pipe was placed through 3 cycles of bending and straightening and then held in the bent position for a further 24 hours. After the bend test, samples of the pipe/Densiflex and PP parent coating were taken from the field joints and sent to a different laboratory for further testing.

The identical procedure was undertaken with a second pipe section, on this occasion with Hyperlast 439 applied to the three field joints.

The results presented in the table below were reported by the independent testing laboratory and witnessed by OJS Installation Contractor Client .

The Droshky pipeline will be 60 Km in length, 8.625" dia x 0.832" W.T API 5L X-70 steel with Polypropylene coating and installed in water depths up to 900 metres using a reeling vessel at the end of 2009.

The above tests were designed to closely simulate the installation conditions, (bending on the reel) and in service conditions. Product data sheets are based upon laboratory samples being tested after casting without bonding or bending stress/strains imposed.