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Mensa is located in approximately 5,300 feet of water, 140 miles southeast of New Orleans and encompasses Mississippi Canyon Blocks 686, 687, 730 and 731.
Our contribution to the Mensa project was unique. The client needed to connect new oil wells located 500 feet from existing PLETs and manifolds. The distance was too far for a traditional jumper to make the span and a pair of PLETs would have been relatively expensive to fabricate and install. Our solution was simple and innovative: we created a jumper that was contained within a truss. This allowed the jumper loads to be supported by the truss and mudmats, thus giving the ability to span the piping greater distances. Using this design, we lowered the cost to the client while maintaining a very short lead time.
Another feature of our Jumper Truss design is the ability to be installed on a wide variety of seafloor grades and elevations. The Jumper Truss structure has freely hinged mudmats which allows the structure to adapt to the various slopes found along the seafloor. The structure can also support flow lines which need to span ravines. Additionally, the mudmats are designed to lock in a vertical position during installation from a vessel. By keeping the mudmats nearly vertical, it reduces the overall surface area affected by the surge loads during installation. That design decision greatly reduced the crane requirements necessary to install the structure subsea.
Finally, we created the Jumper Truss using a modular system of truss segments. This allowed the structure to be easily assembled into various lengths as well as simplifying the fabrication process. The current design allows for Jumper Truss lengths from 65′ to 300′.