Project Profiles

Spar Project Experience

Devils Tower

PROJECT DATA
Client Dominion E&P Co.
Award Date June 2001
Completion Date January 2004
Location Gulf of Mexico; Mississippi Canyon 773
Water Depth 5,610 ft
Hull Type Truss Spar
Hull Diameter 94 ft
Hull Total Length 586 ft
Hard Tank Length 241.6 ft
Hull Weight 13,188 s. tons
Mooring Type 9-line,
Taught Catenary
Chain-Wire-Chain
Risers 8 x TTR
11 ¾”
Single cased
Riser Support System Buoyancy Can
Topsides Dimensions 185’ x 167’ x 66’
Topsides Payload 9,456 s. tons
Production Capacity 110 MMscfd,
60 Mbopd
Export Pipelines 1 x 14” Oil SCR
1 x 14” Gas SCR
   
Project Execution Overview
PMT SparTEC (now FloaTEC, LLC)
Hull Engineering J. Ray McDermott Engineering (JRME)
Topsides Engineering & Procurement JRME
Mooring Engineering & Procurement JRME
Riser Design & Procurement Mentor Subsea (a JRM Company)
Hull Fabrication J. Ray McDermott - Batam Fabrication Yard
Topsides Fabrication TNG Yard/Harbor Island
Buoyancy Can Fabrication JRM TNG Fabrication Yard (Mexico)
Pile Fabrication JRM TNG Fabrication Yard (Mexico)
Mooring Installation JRM DB-50
Hull Installation JRM DB-50
Topsides Installation JRM DB-50 + SLC 5000
   

Scope/Description:

Full EPCI contract to Engineer, Procure, Construct and Install a complete truss spar floating production platform, complete with topsides and workover rig. Scope of work included:

  • Project management
  • Engineering and procurement management
  • Hull, Mooring System & Topside detailed engineering design
  • Procurement of all topsides and hull marine systems equipment and mooring system equipment and components
  • Hull and topsides fabrication, assembly, outfitting and pre-commissioning
  • Installation, hook-up and commissioning ready for hydrocarbons

Innovations:

  • Worlds deepest Spar platform.

Technology:

  • The Spar is moored by a nine line permanent, taut catenary system. The mooring is composed primarily of jacketed steel spiral strand wire, with 5.75" chain at each end. The mooring system is secured to the seafloor with suction pile anchors.
  • Top tension for the risers is provided by buoyant air cans. Production Risers are single cased with threaded coupling connectors.
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