Technology Editor, Surface Systems & Vessels
COLLEGE STATION, Texas -- FloaTEC commenced Phase-2 of their Truss Semi (T-Semi) model test program on Monday at the Offshore Technology Research Center (OTRC) at Texas A&M University in College Station, Texas.
"I was very pleased with the tests," said John Murray, director of Technology Development for FloaTEC. "They confirmed our design tools and gave an indication of the nonlinear-type responses that can only be quantified in these model test campaigns."
The dry tree semi utilizes versions of FloaTEC's proprietary deep draft semi hull design and relies on hydrodynamic interaction between the heave plate and the hull to reduce motions. The truss would be launched like a conventional jacket and mated with the hull either near shore or offshore.
The motions are limited to enable the use of commercially available tensioners, currently limited to under 30-ft (9.2-m) stroke. Longer stroke tensioners beyond 30 ft would require more real estate to accommodate and are currently not commercially available, FloaTEC said, adding they would also be prohibitively expensive. FloaTEC is developing base case designs of the dry tree semi for Gulf of Mexico conditions for two different water depths – 4,300 ft (1,311 m) and 8,000 ft (2,438 m).
The next step is to publish the results of these tests in appropriate periodicals and use the information to promote the design, Murray said.
FloaTEC expects to be ready to offer the design in 2009.
"We are confident in its performance," Murray said.