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Lavrio – Syros Nearshore Protection Work Mattresses Photo 4

Lavrio – Syros, Nearshore Protection Work & Mattresses

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Asso.subsea > Projects > Cable Protection > Lavrio – Syros, Nearshore Protection Work & Mattresses

The Lavrio-Syros II project concerns the second interconnection, between Syros and the Greek Mainland (Lavrio, Attica). This project is the third phase of the Interconnection of the Cyclades to the Greek Mainland Grid.

In summary, the submarine cable route has a length of approx. 108km and a maximum sea depth of approximately 300 meters. The underground part of the 150kV AC Transmission Line on Lavrio side is approximately 1050m long, while the underground part of the 150kV AC Transmission Line on Syros side is approximately 600m long.

Nexans has awarded ASSO a contract for the execution of pre-lay mattresses installation, the submarine cable protection up to 100m w.d. and additionally the landfall preparation and assistance.

 ASSO’s scope of work included:

  • Preparation Activities // Mobilization Activities 
  • Pre-excavation - Onshore 
  • Pre-excavation - Nearshore/Shallow Waters 
  • Pre-lay Mattresses Installation 
  • Pre-trenching - Offshore/Deep Waters (Syros side up to 100m w.d)
  • Post-lay Burial Operations (Lavrio side up to 100m w.d) 
  • Landing Assistance 

PROJECT SPECIFICATIONS

  • Owner
    ADMIE (IPTO)
  • Contractor
    Nexans Norway A/S
  • Year
    2019, 2020
  • Location
    Greece
  • Cable Type
    hvac
  • Cable Diameter
    201 mm
  • Cable Weight
    48 kg/m
  • Alternative Protection
    Pre-lay mattresses: 85m, Cement bags installation: 60m
  • Trenching Length & Burial Depth
    3600m (Pre) & 5660m (Post) @ 0.5m, 1.0m, 1.6m or 2.0m
  • Jetting Length & Burial Depth
    2110m (Post) @ 1.0m & 2645m (Pre with eductor)
  • Max Water Depth
    120m (@ Jointing area)
  • Lavrio – Syros Nearshore Protection Work Mattresses Photo 4
  • Lavrio – Syros Nearshore Protection Work Mattresses Photo 3
  • Lavrio – Syros Nearshore Protection Work Mattresses Photo 2
  • Lavrio – Syros Nearshore Protection Work Mattresses Photo 1

SERVICES PROVIDED

Some of the services we provided for Lavrio – Syros, Nearshore Protection Work & Mattresses 

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VESSELS USED

  • Ariadne

    DP III - Cable Laying Vessel The Ariadne is a DP-3 Cable Laying Vessel built for worldwide operations, ...

    Ariadne Cable Laying Vessels

  • Aethra

    DP II - Trenching Support Vessel The Aethra is a DP-2 Trenching Support Vessel built for worldwide operations, ...

    Aethra Trenching Support Vessels

  • Astrea

    DP II - Multipurpose Support Vessel The Astrea is a DP-2 Multipurpose Support Vessel built for worldwide operations ...

    Astrea General Support Vessels

  • Alcyone

    Multipurpose Support Vessel The Alcyone is a Multi-Purpose Support Vessel specially built for shallow water operations, in light ...

    Alcyone General Support Vessels

EQUIPMENT USED

  • AssoTrencher IV Mk9

    AssoTrencher IV Mk9 sits at the top of the mechanical trenchers range as it forms the latest version ...

    AssoTrencher IV Mk9 Deep Water Trenchers, Subsea Burial Equipment

  • AssoTrencher V Mk3

    Assotrencher V Mk3 is the 3rd version of the AssoTrencher V vehicle from the AssoTrencher series, designed for ...

    AssoTrencher V Mk3 Shallow Water Trenchers, Subsea Burial Equipment

  • Atom

    'Atom' is an ultra-compact work class ROV comparable in size to an electric ROV system. It is designed ...

    Atom Remotely Operated Vehicles

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