Flotation Technologies

Distributed Buoyancy Modules

Distributed buoyancy modules are a critical component of deepwater production systems and are used to maintain a pre-defined configuration such as lazy, steep, or pliant wave in flexible risers, umbilicals and SCRs. These configurations allow the vessel a full range of surface movement without putting undue stress upon the subsea lines and to decouple wave action from the seabed. Made from two major components, the internal clamp and the flotation element, distributed buoyancy modules are engineered and manufactured by Flotation Technologies to meet the stringent requirements of long-term service while minimizing installation time.

The Internal Clamp

The internal clamp is the most important and complex component of the module. It securely attaches the exterior buoyancy to the subsea riser, resisting axial movement throughout all design conditions. These conditions include loads from various sources as well as expansion and contraction of the riser during service which may last for up to 30 years. The clamp is specifically designed to meet these stringent criteria. The internal clamp body is made of high-density Flotec™ syntactic foam that is extremely resistant to creep and provides additional buoyancy to the module. All metallic elements are produced from super duplex stainless steel—providing superior corrosion resistance and tensile strength.

Buoyancy Element

The exterior buoyancy element provides uplift for the system. We manufacture our unique 1/2:1/2 module design from a special grade of Flotec™ syntactic foam and cast into rotationally molded, high-strength polyethylene shells. Each half shell is designed with an internal recess to accommodate the internal clamp, when assembled, locking the buoyancy element in place. A bellmouth at either end of the internal diameter allows for localized bending of the riser, without concern for contact with the element.

Flotation Technologies also offers a 2/3:1/3 module design (PATENT PENDING). Our unitary hinged module latches around the internal clamp and is secured with a single locking pin. This unique snap-rod fastening system dramatically cuts installation time while increasing rig safety.

Testing

A rigorous testing protocol is completed with each production order ensuring that the distributed buoyancy modules meet the service requirements. Testing includes:

• Visual Inspection
• Density Testing
• Dimensional Testing
• Buoyancy Testing
• Weight Testing
• Hydrostatic Strength Testing
• Axial Load Testing
• Clamp Compliance Testing
• Fit Up Testing
• Assembly Testing

• 
  Houston
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  Rio
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  Aberdeen
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  Singapore