Subsea structures

Subsea structures

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Suction piles for Subsea structures foundations

If you’re looking for some significant cost reductions in the fabrication and offshore installation of a subsea structure, founding it with SPT Offshore’s suction piles is the solution.

Benefits of suction piles for Subsea structures foundations

  • Proven technology with numerous suction pile founded structures installed worldwide
  • Very swift and vibration free offshore installation
  • Fabrication costs are reduced significantly, since no pile sleeves, -catchers, -centralizers and mud mats are required
  • No pile drive-, leveling- and grout spread and operation required
  • Leveling of the structure < 0.25 degrees by selective suction
  • Easy decommissioning by reversed installation
  • Engineering and installation by one party, hence SPT Offshore takes over installation and in-situ responsibility

Product Characteristics

  • Integrated suction pile foundation of 3 or 4 suction piles in the subsea structure
  • Suction pump is mounted on top of the subsea structure with one hose to each individual suction pile
  • Manifold in the suction pump controls the flow to each suction pile proportionally
  • Subsea structure installations to a maximum of 3,000m water depth

Transportation & Installation

  1. Mount suction pump on top of subsea structure and lock using remotely operated hydraulic pins
  2. Connect the suction pump with a water hose to each individual suction pile
  3. Open suction pump vent valves
  4. Lift subsea structure and lower to seabed
  5. Position and orientate subsea structure using ROV
  6. Lower suction pile foundation to self weight penetration and close vent valve
  7. Suction operation with ROV
  8. Suction pump proportional control of the flow in each suction pile of the subsea structure makes verticality
  9. Unlock suction pump with ROV hotstab and remove suction pump

Suction Pile Clusters (SPC) for subsea structures

If you’re looking for a quick, efficient and low cost foundation for subsea structures, founding these on SPT Offshore’s Suction Pile Clusters (SPC) is the solution.

Benefits of the SPCs for subsea structures

  • Proven technology with numerous suction pile founded structures installed worldwide
  • Very swift and vibration free offshore installation
  • Fabrication costs are reduced significantly, since no pile sleeves, -catchers, -centralizers and mud mats are required
  • No pile drive-, leveling- and grout spread and operation required
  • Leveling of the structure < 0.25 degrees by selective suction
  • Easy decommissioning by reversed installation
  • Engineering and installation by one party, hence SPT Offshore takes over installation and in-situ responsibility

Product Characteristics

  • SPC with 3 bundled suction piles and subsea connector
  • SPC lift capacity of the SPT Offshore’s suction pump up to 200 mT
  • SPC installation to maximum of 3,000m water depth

Transportation & Installation

  1. Lift suction pump on SPC and lock using remotely operated hydraulic pins
  2. Open suction pump vent valve
  3. Lift suction pump using SAPS-002 lift frame and lower to seabed
  4. Position and orientate SPC using ROV
  5. Lower suction pile to self weight penetration and close vent valve
  6. Suction operation with ROV
  7. SAPS-002 proportional control of the flow in each suction pile of the SPC makes verticality
  8. Unlock suction pump with ROV hotstab and remove suction pump