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STL - Submerged Turret Loading

Brief Presentation of STL

The STL system was introduced in 1993 and represents the state of the art within offshore loading technology. The system is well proven and installed at various fields all over the world.

The development of the STL technology was a result of a demand in the marked for loading systems with high capasity in harsh environments. The loading systems available in the market at the time had restricted operation limitations in bad weather conditions. Loading buoys of the Calm type were efficient.
However, the buoys could not be used in sea states with significant waves (Hs) above 3.5 - 4 meters. More sophisticated loading terminals used in combination with dynamic positioned tankers, could be operational in sea states with Hs of up to 5.5 - 6 meters.

The STL technology offers a flexible, safe and cost-effective solutions for mooring of vessels applied as shuttle tankers or storage vessels. The main design requirements for the STL system are:

  • Connection in sea states up to 5 - 6 meters
  • Weather independent offshore loading
  • Disconnect regardless of weather conditions (if required)
  • Standardized interface between vessel and STL Buoy (any STL vessel can connect to any STL Buoy)
  • Low conversion costs for conventional tankers
  • High level of safety
  • Minimal risk for oil spills
  • The STL system can be used for several different applications, including:

  • Offshore Loading Terminal (OLT)
  • Floating Storage and Offloading (FSO/FSU)
  • Direct Shuttle Loading (DSL, dual STL Buoys)
  • The STL technology is simple, compact, flexible and suitable for a wide range of field developments and water depths:

  • STL for Deep Water
  • STL for Shallow Water
  • STL in Ice Infested waters
  • STL systems as basis for import and export terminals
  • STL Characteristics


     
     
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    STL - Submerged Turret Loading
    STP - Submerged Turret Production
    SAL/SAP - Single Anchor Loading & Production
    SYS - SAL Yoke System
    ETP - External Turret Production
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