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Notice to Mariners - Erebus (Mooring Recovery)



An attempt to recover two moorings, estimated to be located within the approx. locations below, will be undertaken between January 2022 and March 2022 subject to a suitable weather window. A further NtM will be issued to confirm the outcome of the recovery attempt. A Remotely Operated Vehicle (ROV) will be deployed to identify the moorings. The moorings will then be brought to deck and transported to shore.


Wave Buoy Mooring

 

Before the start of the ROV operation:

  • The vessel will run survey lines between the original location and recovery position (see coordinates below).

ROV search locations:

  • 51 °28’35.34”N 5 °36’8.10”W (original location)
  • 51 °28’37.44”N 5 °36’11.04”W (potential recovery position)

 

Damaged Mooring

 

ROV search locations:

  • 51 °27’45.29”N 5 °37’7.32”W (original location)
  • 51 °27’45.10”N 5 °36’39.66”W (estimated release position)

 

In case the mooring system cannot be found at the locations listed above, a survey will be completed within the search area (see NtM for more detail)

 

The NtM also includes further information about the activity, geographical co-ordinates, navigational safety features, vessel details and contact details.

 

It is recommended that mariners continue to remain vigilant and make note of the approximate mooring locations.

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Maintenance Operations - North Hoyle Wind Farm



Please be advised that RWE Renewables UK will be carrying out maintenance operations including heavy lifting at North Hoyle Wind Farm situated off the North Wales Coast. Operations will take place at NH29 and NH26 using the vessel Wind call sign:OXSW2 and will commence on or around 20th of January 2022 and will take approximately 14 days to complete subject to weather.


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Seabed instrumentation frame deployment - Yell Sound



A seabed instrumentation frame will be temporarily deployed in Yell Sound in early February (weather and tidal conditions permitting) for a period of at least 4 weeks before being recovered in a suitable weather / tidal window from mid-March onwards.


The ballasted instrumentation frame weighs around 370kg, measures approximately 1.5m high x 1.5m wide x 1.5m long  and is connected to a 100kg clump weight via a 100m wire ground line.

 

Once installed, the frame will sit on the seabed in water of at least 28m depth, with no surface infrastructure such as buoys or markers. Vessels will be able to pass safely through the area and above the frames. Use of static or mobile benthic fishing gear in the immediate area should be avoided to avoid the risk of snagging.

 

The as-deployed position of the frame will be updated if different from that stated here.

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Seabed Activity Bluemull Sound (Shetland) – Subsea Tidal Array



The purpose of the operation is to conduct work on a subsea tidal energy array in the Bluemull Sound, Shetland.


A multicat vessel the Leask Marine MV C-Force, call sign MITT4 (or a similar vessel) will conduct offshore and subsea operations. Works will include loading and preparatory work at Cullivoe Pier and Belmont Pier. Operations could take place during the day or at night.   Operations will be conducted within the works area bounded by points A/B/C/D below (vessels should keep well clear e.g. 100m) and up to 50m either side of the cable corridor route; see waypoints below.

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Demarcation Buoy 9 Special mark unlit - Moray Offshore Windfarm (East) Limited (Moray East)



Please be aware that while navigating the area to keep an extra look out for the unlit buoy 9 (Special marker buoy) during the hours of darkness and reduced visibility, until such a time as the buoy is repaired.


Please be advised that Moray Offshore Windfarm (East) Limited (Moray East) are reporting that Buoy 9  Special Mark has been reported as unlit Further details on the buoy locations and transit route are provided in Table 1 and figure 1 below. Update on vessel(s) involved in the repair work will be provided through future NtMs and Weekly  Notice ofOperations. These can be accessed in the Moray East website at: http://www.morayoffshore.com/moray-east/the-project/notices-to-mariners/

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Seagreen Offshore Windfarm - Export Cable Installation



Export cable installation activities will commence at the Carnoustie export cable landfall site. On completion of cable pull in activities at landfall the export cable will be surface laid to the Seagreen offshore site where it will be pulled in at the offshore sub-station platform.


On behalf of Seagreen Wind Energy Ltd, Nexans AS will commence the installation of the first of three Seagreen export cables.Operations will commence at the Carnoustie cable landfall site, the export cable will be floated ashore where it will be pulled into the landfall cable protection pipe and terminated. The cable will then be surface laid through the Seagreen export cable corridor to the offshore sub-station platform. Once at the offshore sub-station the cable will be pulled into the platform. The cable will be trenched at a later date. There shall be five vessels utilised during this operation. Nexans Aurora will transport the cable to site and lay it between the landfall site and sub-station platform, there shall be a number of small tenders deployed from the Nexans Aurora during operations at landfall. During pull-in operations at the sub-station platform the Manor Venture crew transfer vessel will deploy teams to the platform. Three guard vessels will be deployed to guard the surface laid cable. Nexans Aurora and Manor Venture are expected to arrive at the Seagreen site on or around the 18th of January. The guard vessels will arrive at different dates which are to be confirmed. 

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Boulder Clearance and Relocation Works - Seagreen Offshore Windfarm



A boulder clearance and relocation campaign will take place within Seagreen Offshore Windfarm site boundary.


An ROV with integrated grab tool will be launched from the Vessel using the vessels heave compensated crane to facilitate the relocation of pre-selected boulders from working areas. Any seabed debris located within working areas will also be relocated. The replacement boulder clearance vessel Siem Dorado is expected to arrive on site on the 17th November 2021 to recommence boulder clearance and relocation operations.

 

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Construction of Wind Farm - Triton Knoll



Activities related to the development of the Triton Knoll wind farm continue, as detailed below. For background information visit: http://www.tritonknoll.co.uk/ Mariners are advised that the asset installation phase of the Triton Knoll OWF is now complete. Post-installation commissioning and repair activity is continuing and it is anticipated that construction vessels required for repair work will be returning to site occasionally in early 2022 and further notices will be issued accordingly.


Mariners are advised that the following vessels continue to be active at the Triton Knoll Offshore Wind Farm as outlined within previously issued NtM's:

 

The following vessels continue to be active at the Triton Knoll as outlined within previously issued NtM's 

Vessel Name

Type

Call Sign

MMSI

IMO

Operating Port

Commence Date

Windcat 11 Crew Transfer Vessel 2BIS9 235066459 N/A Grimsby 14/12/2020
Esvagt Havelok Service Operations Vessel OYFR2 219026496 9878981 Grimsby 25/09/2021
HST Euan Crew Transfer Vessel MGQ03 232025959 9883974 Grimsby 15/01/2021

 

All vessels can be contacted via VHF channel 16 when operational in field.

 

*** Note ***

 

All 90 WTG's have now been fully installed, whilst WTG commissioning and service continues.

All Export Cables are fully installed/buried and need to be deemed live/energised.

All Inter Array Cables are fully installed and buried and need to be deemed live/energised.

Whilst the main installation works have been completed, major construction commissioning works are continuing.

 

*** Note ***

 

Whilst TKOWFL is reopening the site to fishing from the 14th December 2021, TKOWFL kindly request that all fishermen intending to fish within the boundaries of the Triton Knoll wind farm, contact the Triton Knoll control room prior to entering and exiting the field, and inform them of their fishing intentions.

 

This precaution is requested to safeguard all vessels operational at the TKOWF site (including fishing vessels) and your cooperation, to ensure the safety of all parties is appreciated. The following contact details should be used when notifying the Triton Knoll control room of fishing activity:

 

Control Room Manager: Derek Whyte

Radio: VHF channel 16

Callsign: TK MCC

Phone: +44 1793 896250

Email: tkcr@rwe.com

 

Construction activities carried out over the previous 7 Days:

  • Ongoing activities at Offshore Sub Station Platforms East & West continues.
  • Ongoing activities at Offshore foundations & WTG's continues.
  • Wind Turbine Generator Commissioning and Service coontinues infield.

Construction Activities planned for the next 7 days:

  • Ongoing activities at Offshore Sub Station Platforms East & West continues.
  • Ongoing activities at Offshore foundations & WTG's continues.
  • Wind Turbine Generator Commissioning and Service continues.

*** Note ***

 

Application of Triton Knoll Wind Farm Safety Zones During Construction

The Secretary of State has granted the Application of Safety Zones on the Triton Knoll Wind Farm Project as follows:

  • 500m “rolling” safety zones around any structure where construction is being undertaken (as indicated by the presence of construction vessels).
  • 50m pre-commissioning safety zones surrounding partial structures or completed structures prior to commissioning.

Demarcation Buoys

The 12 Demarcation Buoys that were deployed to mark the perimeter of the Triton Knoll Offshore Wind Farm (TKOWF) site boundaries have been removed by th MV 'Barney'.  The southern Metocean Buoy (TK13) has also been removed from the TKOWF.  The northern Metocean buoy (TK14) will remin on locations, as detailed below, until further notice.

 

Buoy

Structure

Latitude

Longitude

Individual Specification

TK14

Metocean Buoy

53°30.581'N

000°47.944'E

Triaxys metocean wave and current buoy (North) exhibiting a Fl (5) Y 20s light character (3 nm nominal light range)

 

Mariners are advised that all foundations monopiles have been installed and all inter-array and export cables have been installed.

 

Local Notice to Mariners Recently

NtM 001-2021 (05th January 2021)

NtM 002-2021 (20th January 2021)

NtM 003-2021 (17th March 2021)

NtM 004-2021 (24th March 2021)

NtM 005-2021 (06th April 2021)

NtM 006-2021 (16th April 2021)

NtM 007-2021 (18th May 2021)

NtM 008-2021 (29th June 2021)

NtM 009-2021 (29th July 2021)

NtM 010-2021 (20th August 2021)

NtM 011-2021 (12th November 2021)

NtM 012-2021 (18th November 2021)

NtM 013-2021 (16th December 2021)

NtM 014-2021 (22nd December 2021)

NtM 015-2021 (31st December 2021)

 

Navigation Warning - 08th January 2021

 

Mariners are advised that the remnants of a Wave Rider Buoy sinker weight and partial rigging are located within the Triton Knoll Offshore Wind Farm Construction site at the following location;

 

53° 30.442N 000° 50.564E

 

It is advised that the partial rigging could potentially be floating up to 9.7m above the seabed, reducing the navigable safe water in the immediate area to 10m LAT.  Mariners are advised to avoid the indicated position by 250 metres.

 

Possible Dangers to Navigation - Properties of the polypropylene show that the rope is buoyant, this makes the line sensitive for thruster currents. Taking the site water depth into consideration (19.7m LAT) and the maximum expected height above seabed of the rope 9.7m the line is expected to be floating submerged at approximately -10m LAT. In addition, it is noted that over time sediments will be trapped between the fibres and the heavier rope may finally sink. The polypropylene rope may impose a risk to foul propellers / propulsion of vessels due to the buoyant nature of the rope. As the rope is submerged at a depth of ~-10m LAT the risk is considered minimum for vessels with a shallow draught (<5m) and medium for a vessel with a deeper draught (>5m). Over time sediments will be trapped between the fibres and the heavier rope may finally sink thereby reducing the risk to propellers/propulsion of vessels. The clump weight itself (chain) is expected to have sunk into the seabed and has no significant height above seabed. In addition, the edges of the clump weight are mostly rounded (chain), the risk the clump weigh imposes to fishing activities/gear is therefore considered to be minimal.

 

Navigation Warning - 16th March 2021

 

Mariners are advised that two UXO targets have been confirmed within the Triton Knoll Offshore Wind Farm Array.

 

Mariners are advised that the two confirmed targets are located within 20 metres water depth (LAT) and a 10 metre radius exclusion zone is required around each target.  The following table provides the coordinates and a description for each target.

 

Description of Target Latitude Longitude

Water Depth

(LAT) Metres

Required Exclusion

Zone (Metres Radius)

Archaeological - The item is thought to be an air-delivered bomb.  It appears to be in a stable condition and is resting on the seabed.  Marine growth and concretion cover the body, indicating it has been in situ for a significant duration. The tail section of the bomb is missing, which is typical of unexploded bombs from WWII found in these circumstances and there is a significant hole in the case. The dimensions and characteristics gathered are consistent with a 500kg German bomb. Considering the state of the bomb the Net Explosive Quantity of the bomb is likely to be <5kg. 53°31'50.249"N 00°47'45.908"E 20 10
Archaeological - The item is thought to be an air-delivered bomb.  It appears to be in a stable condition and is resting on the seabed.  Marine growth and concretion cover the body, indicating it has been in situ for a significant duration. The tail section of the bomb is missing, which is typical of unexploded bombs from WWII found in these circumstances and there is a significant hole in the case. The dimensions and characteristics gathered are consistent with a 500kg German bomb. Considering the state of the bomb the Net Explosive Quantity of the bomb is likely to be <5kg. 53°31'49.895"N 00°47'45.115"E 20 10
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Survey - Aberdeen Wind Farm - HT1 Pipeline Route



Survey Operations will take place for the proposed HT1 Pipeline Route, located between the Aberdeen Offshore Wind Farm and Aberdeen Port. The route starts at the existing Aberdeen Offshore Wind Farm (AOWF), with KP0 located at the proposed landfall in Nigg Bay and ends at Wind Turbine Generator (WTG) B06.


Please be advised that Vattenfall Windpower Ltd. has contracted Fugro to carry out a geoscience survey for the proposed HT1 Pipeline Route, located between the Aberdeen Offshore Wind Farm and Aberdeen Port.

 

The route starts at the existing Aberdeen Offshore Wind Farm (AOWF), with KP0 located at the proposed landfall in Nigg Bay and ends at Wind Turbine Generator (WTG) B06 at KP12.4. 

 

The geoscience survey shall provide seabed bathymetry, sub bottom data, side scan sonar imagery and magnetometer readings, as well as geotechnical/environmental data, all within the defined survey area.

 

The survey will utilise one vessel to complete survey operations:

  1. Valkyrie (nearshore vessel) Operating during daylight hours
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Cable Route Survey - Oceaniq Q&E North and South



Mariners are advised that survey vessels and equipment will be used in the offshore areas and coastal sea waters between UK, France and Belgium. Further nearshore and landfall survey work will be concentrated around Ramsgate, UK, to Oostende, Belgium on the Northern Q&E route and Newhaven, UK to Cayaux-surMer, France on the Southern Q&E route.


The offshore geophysical surveys will be conducted by MMT using survey vessel Northern Franklin call sign: OZIH2  from approximately the 13th of January 2022.

The nearshore geophysical surveys work will be conducted by DeepBV using survey vessels Deep Seapal call sign: PCAA and Deep Marker call sign: PDXJ from late January 2022, approximately the 24th Jan 2022.

 

Project Description
Oceaniq Q&E route surveys will be conducted by MMT on behalf of Oceaniq, Global Marine Group. Global Marine are turnkey installation contractors to two fibre optic cable systems; Q&E North and Q&E South. A pre-installation geophysical survey with towed/tethered-equipment and sensors is scheduled between January and March 2022, with the installation is scheduled for 2023. The proposed subsea fibre optic cables are required to increase internet bandwidth capacity to meet rising demand. The International Cable Protection Committee (ICPC) notes that approximately 99% of the World’s communication are provided by such subsea cables.


Survey task
A detailed geophysical & geotechnical survey will be carried along the proposed cable route corridor of Q&E north and Q&E south.

  • Q&E north is approximately 112 km long and a 500 m wide corridor.
  • Q&E south is approximately 141 km long and a 500 m wide corridor.

The geophysical survey work will be conducted by vessels Northern Franklin and Deep Seapal & Marker with hull mounted MBES and SBP with ROTV mounted sidescan sonar, sub-bottom profiler and tethered magnetometer beginning January 2022.

 

Port of Operation
Northern Franklin will mobilise in the port of Dover, UK from 13th January 2022. Deep Seapal and Deep Marker will mobilise in the port of Ramsgate, United Kingdom from 24th January 2022.
 

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Inter Array Cable Installation - Seagreen Site Boundary



On behalf of Seagreen Wind Energy Ltd, Seaway 7 will install and trench inter-array cabling between the wind turbine generator foundation structures and offshore sub-station platform within the Seagreen site boundary. Operations will commence with cable lay and trenching between wind turbine generator foundation structures, inter array cables will also be installed into the Offshore Substation Platform at a date to be confirmed. Two vessels will be involved in the operation.


Siem Day – This vessel will act as the Installation Support vessel, cable installation technicians will be deployed to the wind turbine generator foundation structures using the vessels’ motion compensated gangway system. The cable pulling equipment will be transferred onto the foundation structure and set up ready for the cables to be pulled into the structure and secured in the foundation basement. The motion compensated gangway system can be used for personnel and cargo transfers.

 

Seaway Aimery – This vessel will lay the inter array cable between adjacent foundation structures. Once the cable has been pulled in and secured at the first foundation, the cable will be surface laid to the second foundation, pulled in and secured. On completion of this operation the cable will be trenched to a pre determined depth utilising a remotely operated trenching vehicle.

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Mattress Installation - Nemolink



Jifmar SA from France has been engaged by NEMOLINK to carry out subsea mattress installation works offshore Ramsgate on the Nemolink cable interconnector between the UK and Belgium. Using Vessel Roxane Z call sign: FIRJ from 23rd of January 2022 Expected duration max 10 days.


The operations will be carried out in the following area as defined in the marine licence: L/2021/00335/1

 

The operations will be carried out using the Multipurpose vessel ROXANE Z, FLAG FR, IMO 9751456  Callsign FIRJ, specifications enclosed. 

 

Small assistance craft may be employed on site in a direct vicinity of the works.

 

In total 3 concrete mattresses of 6 x 3 x 0.3m will be installed. All mattresses will be fitted with artificial seaweed fronds. 

 

Please find attached the construction drawing for your reference. 

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Blind Joints Installation Works - Viking Link Project



Mariners are advised about cable jointing activities planned for the Viking Link project which is an HVDC electricity transmission interconnector between Denmark and England, a joint venture between National Grid and Energinet. Installation of 2 blind joints at the end of offshore C2 cable ends using vessel Cable Enterprise call sign: 2FOV9 and Tug Norne call sign: PCJR from 13th January. Expected completion by early February 2022.


Vessels are requested to pass at a safe speed and distance and fishing vessels are advised to remain a safe distance, approximately 550m (0.3 nautical miles) from the areas identified. During these works the vessel will have restricted manoeuvrability as it completes its work scope.


VHF CH 16 will be monitored at all times and will be used to contact the coastguard in the event of an emergency
 

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Dogger Bank Wind Farms (A & B) - Nearshore Intervention Works



The Backhoe Dredger vessel Capall Mara will transit from the Port of Grimsby on the 22nd January 2022 to the work site at Bridlington Bay. The Capall Mara will be carrying out spoil management activities. She will remain on station/site during the night and be manned 24 hours throughout.


Diving operations will be carried out from the Capall Mara. These will include exposing the Horizontal Direct Drilling (HDD) exit points and preparation of the ducts ready for the submarine power cables. Diving operations will be carried out in the hours of darkness. A short safety message will be broadcast on CH16 warning of diving operations starting and ceasing.

 

The Celtic Mara will be carrying out Multi Beam Echo Sounder (MBES) surveys of the seabed and along the pre-cut trenches throughout the dredging activities. The survey gear will be positioned on a side mounted pole and extended into the water. Celtic Mara will make several passes over the area at a reduced speed. Celtic Mara will transit daily from Bridlington Harbour to the Capall Mara throughout the project.

 

During dredging and diving operations it is requested that The Capall Mara and Celtic Mara be given a 500m safety clearance zone. Diving flag ‘Alpha’ and the appropriate lights will be displayed during diving operations. The appropriate day shapes and lights will be displayed during survey operations

 

Both vessels will monitor VHF Ch 70 and 16 during operations.

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Dogger Bank B Geophysical Survey



The survey vessel, Fugro Pioneer, will conduct a geophysical survey at the Dogger Bank B wind farm (DBB) array site in the Southern North Sea, between 17th January 2022 and approximately 28th February 2022.


The Fugro Pioneer will be surveying prescribed survey lines, which will require large turning circles. It is therefore requested that all vessels maintain a minimum 3000m separation distance from the survey vessel and pass at reduced speed.

 

Survey operations will be continuous, 24 hours a day, the vessel towing subsea sensors up to approximately 300m behind the vessel. 

 

During operations the vessel will be restricted in its ability to manoeuvre and will display the appropriate day shapes and lights.

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WTG Installation and Commissioning - Moray East Windfarm



Moray Offshore Windfarm (East). Now that installation is complete, Commissioning will continue using 1 SOV (Esvagt Alba) , which will transfer teams of technicians via walk-to-work to carry out commissioning works in readiness for energisation. Installation and commissioning works will commence circa 5th January 2021 until completion.


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Proposed Scotland - N.Ireland 4



Global Marine will be conducting the installation of the Scot-NI 4 telecommunications cable in Scottish and Northern Irish waters on behalf of British Telecommunications plc. Timings are dependent upon weather and other operational conditions.


Nearshore/beach works

The Green Isle, Challenger & Gracy Eva vessels will be supporting & conducting intertidal and nearshore cable installation & trenching works. These works will be conducted along with some supporting shallow draft vessels (RIBs).

 

Cable Name Landing Point Date
Scot - NI 4 Girvan

Landings complete with some outstanding burial works.  Expected to be completed 14th to 28th January 2022.

Timings and locations are dependent on weather and other operation conditions.
Scot - NI 4 Larne Landing expected to be completed 11th January 2022 followed by outstanding burial works. Expected to be completed by 28th January 2022.

 

Pre-Lay Grapnel Run (PLGR) & route clearance 3rd - 8th December 2021 (Scot-NI 4) - Complete

 

Cable installation Expected completion date 11th January 2022

 

Post Lay Inspection Burial (PLIB) 1st January 2022 – 31st January 2022 (Scot-NI 4)

The CS Sovereign vessel will be conducting PLIB activity along the Scot-NI 4 proposed cable route between 1st January 2022 and 31st January 2022, starting at Girvan and moving towards Larne.

 

The vessels will be limited in manoeuvrability therefore, vessels working in the area should maintain a distance of at least 1NM from the cable ship during operations.

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Havhingsten Cable - surface-laid cable awaiting burial works (expected January 2022)



Please be advised that Post Lay Inspection and Burial (PLIB) of the Havhingsten fibre optic telecommunication cable system in the Irish Sea outside of the Irish and Isle of Man 12 nautical miles is planned to occur from the 14th January 2022. The cable has been installed and is surface laid at the locations detailed below until the PLIB takes place. It is advised that extra care is taken when vessels are operating near this area and that no vessel should trawl within 500m.


Please be advised that Post Lay Inspection and Burial (PLIB) of the Havhingsten fibre optic telecommunication cable system in the Irish Sea outside of the Irish and Isle of Man 12 nautical miles is planned to occur in early January 2022. Works outside Irish and Isle of Man Territorial Waters (TW) are planned to start on 14th January 2022, the duration of the works is provided below.

 

The cable has been installed and is surface laid at the locations detailed below until the PLIB takes place. It is advised that extra care is taken when vessels are operating near this area and that no vessel should trawl within 500m.

 

The supplier of the Havhingsten cable is Alcatel Submarine Networks (ASN). Intertek are the environmental and permitting consultants.

 

The entire cable system comprises marine elements that pass from Denmark to the UK (NE region); from the UK (NW) to the Republic of Ireland; with two segments installed into landfalls on the Isle of Man. 

 

Installation will be via industry standard burial tools including water jetting with Remote Operated Vehicle (ROV). Target cable burial depth is 1.5m below seabed level in the region.

 

There will be 2 locations where PLIB will be performed, at Final Splice (FS) location outside Irish TW and at Branching Unit (BU) location outside Isle of Man TW.

 

All vessels are requested to maintain an appropriate and safe distance of 500m around installation vessels whilst operational and should pass at the lowest possible speed to avoid vessel wash effects.

 

Vessels will be working throughout 24 hours and will display appropriate day shapes and lights during reduced visibility and night operations.

 

 

Planned durations of works in Irish Sea are as per below (subject to weather):

Area

Start

Finish

Duration

Irish Sea PLIB works

14/01/22

20/01/22

7 days

 

All planned installation dates/durations are subject to weather.

 

Coordinates for the location of surface-laid cable and the installation area at each PLIB location:

Location

Latitude

Longitude

Location

Final Splice (FS)

53° 38.6200’ N

5° 40.3271’ W

Irish EEZ

Branching Unit (BU)

53° 50.9783’ N

4° 59.3763’ W

IoM/UK EEZ

 

 

Details of the vessel proposed to be used are provided below:

Cable Installation Vessel: Ile d'Aix                                                                                                              

Length Overall:                                  151.5 m

Breadth:                                              21.6 m                 

 

For further information please contact the following Vessel / Fisheries Liaison Officer (FLO) contacts:

 

Vessel contacts:

Call sign of the Ile d’Aix: FICI

Ile d’Aix Master: master@iledaix.lda.fr; Tel: +47 23 67 47 85 and +47 23 67 47 84

Pierre Alain Marchadour, Offshore Operations Manager:

pierre_alain.marchadour@asn.com; Tel: +33 6 43 45 01 88

 

FLO, MarineSpace:

Bethan Owens                  bethan.owens@marinespace.co.uk – 07833 557808

Jonny Lewis:                       jonny.lewis@marinespace.co.uk – 07817 644284

 

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Maintenance Repairs on the Sheringham Shoal Windfarm - February 2022



Start date slippage from approximately 4th February 2022 the Construction Vessel/Self Elevating Unit (Jack Up Vessel) “Wind Enterprise” will perform maintenance at the following locations A07 & B02 with an approximate duration of 4 days at each location. Mobilisation dates and duration are subject to weather delays.


Equinor is planning to undertake a maintenance activity on the Sheringham Shoal windfarm using the Wind Enterprise Offshore Construction Vessel /Self Elevating Unit.

 

The maintenance  is planned to take place during February 2022 as per the attached notice.

 

Mariners should note that there is a mandatory 500m Safety Zone whenever the “Wind Enterprise” is alongside a turbine and a minimum 500m is also requested whenever the vessel can be observed afloat and manoeuvring into position.

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Exposed and Free Span - Greater Gabbard Offshore Wind Farm



Results of the Greater Gabbard OFTO export cable survey. The chart lists the changes to the exposures on the three export cables, on the inshore section between KP 3 and KP 5 with a free span remaining around KP 4. Between KP 36 and KP 38 there are some exposed sections as the cables enter the site. In addition, although listed as exposures on the chart, there are areas of shallow burial at KP10 and a cable exposure on the interconnector cable within the site.


Please find attached a chart showing the results of the Greater Gabbard OFTO export cable survey. The chart lists the changes to the exposures on the three export cables, on the inshore section between KP 3 and KP 5 with a free span remaining around KP 4. Between KP 36 and KP 38 there are some exposed sections as the cables enter the site. In addition, although listed as exposures on the chart, there are areas of shallow burial at KP10 and a cable exposure on the interconnector cable within the site.

 

The exposed/shallow burial areas are shown as the coloured dots on the cable route highlighted in a black box.  Equitix (Greater Gabbard OFTO) have asked that all Fishermen operate with caution when fishing anywhere on the cable route and particularly the areas that are shallow buried around KP10.’

 

Coordinates of exposed/shallow burial areas are shown on the attached chart.

 

The OFTO is updating its risk assessments to determine the extent of remedial measures that may be required. Equitix intend to provide an update on remediation after the risk assessment exercise is complete.’

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Eastern Irish Sea Wind Farms - Monthly Notice To Mariners - Update



General Maintenance and Survey for Barrow, Burbo Bank, Burbo Bank Extension, Walney 1, 2, 3 & 4, West of Duddon Sands.


General Maintenance

Site Lighting and Marking Status Survey Jack-Up Vessel Other Works
Barrow (BOW) All currently operational N/A N/A MCS Pampero
Burbo Bank (BBW 01) BB42 partial outage

N/A

N/A

Dropped Object

Forth Trojan, Forth Jouster,

Forth Atlas

Burbo Extension (BBW 02) All currently operational EGS Watchful

N/A

N/A

Walney 01 and 02 (WOW 01&02) All currently operational N/A N/A

Bibby Wavemaster

Walney Extension (WOW 03 & WOW 04) (WOW Ext)

All currently operational N/A N/A N/A
West of Duddon Sands All currently operational N/A N/A

N/A

 

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Inch Cape Offshore Wind Farm - Development Area Site Investigations



Site investigation in the Development Area for the consented Inch Cape Offshore Wind Farm located within the Outer Firth of Tay.


Please be advised that Fugro will be continuing to perform site investigation works on behalf of Inch Cape Offshore Limited. The works are to be carried out within the Development Area (see Figure 1 below) for the consented Inch Cape Offshore Wind Farm located within the Outer Firth of Tay.

 

The second phase of the site investigation works continue and are expected to complete by 28th February ‘22, weather permitting. The works will be undertaken primarily using the vessel Fugro Scout mobilising from the port of Aberdeen. The vessel will return to port periodically for a crew changes. To expedite the work a second vessel, Fugro Synergy, will be on site for a approximately 3 weeks on or after the 14th of January.

 

During the survey the vessel will be displaying the relevant RAM lights and displays during periods of restricted manoeuvrability. Whilst not recommended, vessels entering the survey area are requested to maintain a 500 m safety zone.

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Deployment of Two Metocean Buoys, with Co-Located Guard Buoys - Dogger Bank



Partrac are to deploy two metocean buoys at two locations within the Dogger Bank South Project Area in January 2021, for a period of 6 months. The metocean buoys will be deployed alongside two guard buoys which will be co-located ~200 m NNW from the Metocean Buoys. Please maintain a 500 m clearance from the deployed equipment.


The guard buoys are yellow pillar shaped special marks, exhibiting a yellow St Andrews Cross day shape and radar reflector.  The buoys are each fitted with a yellow light, flash sequence: Fl (5) Y 20s 

 

The metocean buoys are 1.1 m diameter spherical buoys, fitted with a navigation light, flash sequence: Fl (5) Y 20s. 

 

Further details, including vessel informaiton, will follow ahead of deployment operations. 

 

 

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Survey - Uncrewed Surface Vessels (USV) Irish Sea



Operations of remotely piloted Uncrewed Surface Vessels (USVs) are planned out of Beaumaris, Isle of Anglesey. There will be up to 3 USV’s operational at any one time.


Dates: Operations are expected to commence on Sunday 9th January, subject to weather, and throughout the month of January 2022.

 

A support vessel will escort the USV from the active ports to the port limits.

 

Although the vessel is uncrewed, it is managed throughout the 24 hour operation, piloted remotely using 360 degree cameras and other navigational aids.

 

Figure 1 and 2 below indicate the operational area. The operational boundary is indicated in Tables 1 and 2 below also. In addition to the survey areas, the USVs will transit from Carlingford Lough (Ireland) or Douglas (Isle of Man) or Rhyl harbour.

 

The USV sends real time images and situational awareness data over satellite to a team of operators keeping watch and controlling the vessel remotely 24/7.

 

Safety Precautions: The USV is equipped with the following to make it conspicuous to other marine traffic:

  • AIS
  • Navigation Lights & Sound Signal
  • Active Radar Reflector
  • Superstructure Painted Yellow

 

Seafarers are asked to avoid contact with the vessel and be aware of the operational area during this period.      

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Survey - Outer Dowsing Offshore Wind



Outer Dowsing Offshore Wind (a joint venture between TotalEnergies and Green Investment Group) shall be conducting a 5-6 month offshore geophysical survey approximately 60km East of the Humber Estuary from 10th August 2012 to 31st January 2022.


Using vessel Guard Celena call sign : V7OY7. The survey vessel shall be towing a cable up to approximately 150m behind the vessel (the end marked by a tail buoy) at depths of up to 3m below sea level. The survey vessel shall have limited maneuverability so please allow a safe distance.

 

Company: Outer Dowsing Offshore Wind

Contractor: Enviros Survey & Consultancy Limited

Survey vessel : Guard Celena

Survey vessel call sign: V7OY7

 

Earliest start date: 10th August 2021 Latest finish date: 31st January 2022

 

It should be noted that the survey vessel shall be initially accompanied by a fishing vessel: Sorrento GY189 providing visual reconnaissance for any sea surface obstacles. Company : Outer Dowsing Offshore Wind

Contractor : NFFO Services Limited

Support vessel : Sorrento GY189

Support vessel call sign : 2XLE

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Construction of wind farm - Moray East



Due to the construction of the Moray East Offshore Wind Farm, there are several elements to this notice - safety zones; construction schedule; and buoy positions.


For background information about Moray East, please visit: www.morayoffshore.com/moray-east

 

Safety Zones

Please be advised that the Scottish Ministers have authorised the use of the safety zones during construction and operation of the Moray East Offshore Wind Farm as detailed below.

 

During construction

  • A 500 metre radius around each WTG and OSP where construction works are taking place that include sensitive activities being undertaken by vessels RAM. A maximum of three of such zones is permitted at any one time. 
  • A 50 metre radius around partially completed WTGs and OSPs where work is not underway and the risk assessments identify a need. 
  • A 50 metre radius around each completed WTG and OSP prior to commissioning and as required by a risk assessment process. 

During major maintenance

  • A 500 metre radius around all major maintenance works being undertaken around the WTGs and OSPs. No more than one major maintenance zone is permitted at any one time.

Construction Activities

It is currently anticipated that weather permitting offshore construction works will be carried out on a continuous basis (i.e. 24 hour working, seven days a week) unless notified otherwise.

 

Please be aware that by virtue of its mode of operation and the equipment deployed, construction vessels listed in the table below may be Restricted in their Ability to Manoeuvre as defined under COLREGS (International Regulations for Preventing Collisions at Sea 1972, Rule 3). Masters of vessels are therefore requested to maintain their vessels and gears at a minimum safe distance from these vessels of 500 metres when they are undertaking it work and showing the appropriate shapes and lights.  Further Notice to Mariners will be issued as construction progresses.

 

  •  
 

Company,

Vessel &

Call Sign

Survey Area

Survey Area

Start Timeframe & Duration

Seacat weatherly

MHXT7

As above As above 29 September 2021 Until further notice
Esvagt Wind 8 As above As above 2nd July 2021 until further notice
Esvagt Alba As above As above

2nd July 2021 until further notice

 

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Seabed instrumentation frame deployments - South Stack Irish Sea



Two seabed instrumentation frames with associated ground lines and clump weights have been temporarily deployed for at least 6 weeks and will be recovered in a suitable weather / tidal window from early February 2022.


Each ballasted frame weighs around 370kg, measures approximately 1.5m x 1.5m x 1.5m and is connected to a 100kg clump weight and remotely actuated pop-up buoy via a 100m wire ground line.

 

Once installed in the Morlais demonstration zone the frames will sit on the seabed at depths of at least 30m, with no surface infrastructure such as buoys or markers. Vessels will be able to pass safely through the area and above the frames. Use of static or mobile benthic fishing gear in the immediate area should be avoided to avoid the risk of snagging.

 

The positions listed here are as deployed.

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Skye - Harris Subsea Electricity Cable



Mariners should be aware that a new subsea electricity cable between Ardmore (Skye) and Beacravik (Harris) has been installed within the corridor indicated. Charts and other datasets will be updated to reflect this new cable route once final as-laid positions have been received.


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Shetland HVDC Link - Boulder Clearance Activity



NKT, on behalf of Scottish Hydro Electric Transmission Plc (SHE Transmission), will be undertaking boulder relocation along the Shetland HDVC link cable route between Noss Head, North of Wick and a landfall in Weisdale Voe, Shetland. Due to uncertain weather conditions the sequence of boulder relocation operations may require the vessel, SEAWELL, to move to Weisdale Voe, Shetland to undertake boulder relocation works earlier than previously notified.


The Shetland HVDC link is a critical electricity transmission link and will form part of the electrical transmission grid that is essential to the transport of renewable energy between the locations where it is generated and areas of demand, and the delivery of both Scotland’s and the United Kingdom’s 2030 climate change targets.

 

The vessel Seawell will utilise a grab, similar to the illustration in the attached NtM, to relocate the boulders. Boulders will be picked and relocated within the consented installation corridor, so that sufficient clear seabed is created for the safe installation of the cables. The locations of boulders picked and the location they are placed will be recorded.

 

Due to uncertain weather conditions the sequence of boulder relocation operations may require the vessel, SEAWELL, to move to Weisdale Voe, Shetland to undertake boulder relocation works earlier than previously notified. The vessel may begin works nearshore and move out offshore along the cable route from the 17 December 2021. An extension to the overall remaining boulder relocation works has also been updated within the attached NtM. The estimated completion date is now the 31 January 2022, please note that this date is subject to weather and operational uncertainties that could extend the overall duration to 14/02/2022, with the potential for further extension to the work duration.

 

This updated notice provides the coordinates and locations of the working area, with further details provided in the attached NtM. Indicative schedules for boulder clearance operations are provided below:

 

Boulder Clerance Activities are completed in the following areas;

 

  • Area 1: (KP250 – KP225) 
  • Area 2: (KP225 – KP200)
  • Area 3: (KP200 – KP150) 

Boulder Clearfance Activities will continue in the following areas;

  • Area 4: (KP150 – KP100) Start date: 22/11/2021 Estimated Completion Date: 31/01/2022
  • Area 5: (KP100 – KP50) Start date: 22/11/2021 Estimated Completion Date: 31/1/2022
  • Area 6: (KP50 – KP25) Start date: 22/11/2021 Estimated Completion Date: 31/01/2022
  • Area 7: (KP25 – KP0) Start date: 17/12/2021 Estimated Completion Date: 31/01/2022

These dates are subject to weather and operational uncertainties that could extend the overall duration to 14/2/2022, with the potential for further extension to the work duration.

 

Please be aware that the Seawell will be restricted in her ability to manoeuvre as defined under COLREGs (International Regulations for Preventing Collisions at Sea 1972). Masters of vessels are therefore requested to maintain their vessels at a minimum safe passing distance of 500 metres. The Seawell will display the appropriate shapes and lights in accordance with COLREGs Rules 16 and 18.

 

Legal Notice

Please be advised that this Notice to Mariners should be treated as official notice of the nature, duration and location of the works which are scheduled to take place. During the period of this notice, failure to remove equipment or entry into the identified location in a manner that would constitute a hazard to the operations described may be considered a breach of the Convention on International Regulations for Preventing Collisions at Sea 1972 and/or the Merchant Shipping Act 1995 (a breach of which can carry criminal sanctions). Additionally, should any failure to remove any equipment within the notified location, or the presence of any vessel, prevent, obstruct, or delay the works, Scottish Hydro Electric Transmission Plc may consider taking legal action to remove the obstruction and/or seek damages for any delay, in addition to any legal costs in doing so.

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Morgan (North) & Mona (South) - Eastern Irish Sea - FUALTY AIS



PLEASE BE AWARE THAT THE AIS ON BOTH OF THE METOCEAN BUOYS THAT HAVE BEEN DEPLOYED WITHIN THE PROPOSED WIND FARM SITES, MORGAN AND MONA, IS PRESENT BUT APPEARS TO BE ONLY UPDATING THE POSITION INTERMITTENTLY. THIS IS BEING INVESTIGATED. THE MAIN NAVIGATION LIGHTS REMAIN FULLY FUNCTIONAL. FURTHER INFORMATION ON THE BUOYS IS CONTAINED WITHIN THE ATTACHED NtM. Please see attachment and Description below regarding Deployment of Metocean and Floating LIDAR Buoys


Position of the two METOCEAN BUOYS  ( Now Deployed)

 

MORGAN (North)  53°59.71'N   003°59.73' W

 

MONA (South)       53°40.27'N   003°53.77' W

 

Description of Buoys : Yellow ‘X’ shaped topmark, Yellow in colour.  

 

Characteristics of Buoys  :  FI (5) 20s light (3.5nm range)  Flash rate not exceeding 20 per minute

……………………………………………………………………………………

 

Position of the two FLOATING LIDAR BUOYS (Deployment scheduled for Quarter 1 2022)

 

MORGAN (North)  53°59.52'N   003°59.40'W

 

MONA (South)       53°40.08'N   003°53.44'W

 

Description of Buoys : Yellow ‘X’ shaped topmark, Yellow in colour.

 

Characteristics of Buoys  :  FI (5) 20s light (3.5nm range)  Flash rate not exceeding 20 per minute

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Recovery of dropped moorings within the proposed Erebus Site



An attempt to recover two moorings, estimated to be located within the approx. locations below, will be undertaken during between December 2021 and mid-January 2022 subject to a suitable weather window.


A Remotely Operated Vehicle will be deployed to identify the moorings. The moorings will then be bought to deck and transported to shore.

 

Wave Buoy Mooring:

Before start of the ROV operation:

  • The vessel will run survey lines between original location and recovery position (see coordinates below).

ROV search locations

  • 51°28'35.34"N     5°36'8.10"W (original location)
  • 51°28'37.44"N     5°36'11.04"W (potential recovery position)

 

Damaged Mooring:

ROV search locations:

  • 51°27’45.29”N    5°37’7.32”W (original location)
  • 51°27'45.10"N     5°36'39.66"W (estimated release point)

In case the mooring system cannot be found at the above locations, a survey will be completed within the search area:

 

Description

Degrees Decimal Minutes

Degrees Minutes Seconds

Latitude

Longitude

Latitude

Longitude

NW

51° 27.777’ N

005° 37.152’ W

51° 27’46.74”N

005° 37’09.12”W

N

51° 27.757’ N

005° 36.832’ W

51° 27’45.42”N

005° 36’49.92”W

NE

51° 27.813’ N

005° 36.490’ W

51° 27’48.78”N

005° 36’29.34”W

SE

51° 27.758’ N

005° 36.488’ W

51° 27’45.48”N

005° 36’26.94”W

S

51° 27.703’ N

005° 36.837’ W

51° 27’42.18”N

005° 36’50.22”W

SW

51° 27.731’ N

005° 37.162’ W

51° 27’44.22”N

005° 37’09.72”W

 

 

These locations identified will be surveyed to ensure all possible known locations have been searched.    

 

A further NtM will be issued to confirm the outcome of the recovery attempt.

 

It is recommended that mariners continue to remain vigilant and make note of the approximate mooring locations.

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Seagreen Offshore Wind Farm –Installation & Commissioning of Wind Turbine Generators



Installation of wind turbine generators (WTG) will commence within the boundaries of the Seagreen offshore wind farm.


On behalf of Seagreen Wind Energy Ltd, MHI VestasOffshore Wind will commence the installation and commissioning of 114 wind turbine generators.There shall be four vessels utilised during thisoperation.The Jack up Vessel Wind Ospreywill be the main installation vessel. Wind Osprey will transport the WTG components to site, jack up to the required height next to the foundation structure and install the WTG components.The Service Operation Vessel (SOV)Acta Centauruswill provide accommodation for the WTG commissioning technicians. Personnel will utilise the Acta Centaurus’s walk to work gangway system to access the WTG structures for commissioning activities.Two Crew Transfer Vessels(CTV’s), HST Euanand the HST Harriwill support the above two vessels during installation andcommissioning activities.The above vessels are expected to arrive at the Seagreen site on or around the 5thof December, WTG installation activities shall continue until late 2022.

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Exposed Pipe - Installation of temporary marker buoy



This notice to mariners (NtM) relates to the location of a temporary marker buoy positioned between the exposed export cable ducts protruding from the seabed, and further relating to spoil piles, which are estimated to reduce water levels at LAT by approximately 25%.


For periods between the active nearshore works (described in NtM LF500013-MIP-DOG-NOT0012), the temporary marker buoy will be positioned between the exposed ducts (as shown in the charts below). When the works vessels are on site, the buoy will be moved to the north of this location to allow work to continue.

 

On completion of all the nearshore works, estimated for end July 2023, the temporary marker buoy will be removed from site.

 

This NtM supersedes LF500013-MIP-DOG-NOT005 Rev02, issued on the 26th Aug 2021

 

The marker buoy characteristics are: Yellow Special Mark, light pattern: Fl(Y)5s

 

Mariners are reminded to navigate with caution, keeping a safe passing distance from the temporary marker buoy and keeping a continuous watch on VHF Ch. 70/16 when navigating the area.

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Deployment of metocean buoys and Floating LiDAR buoys - Morgan & Mona



Metocean buoys have been successfully deployed within the Morgan and Mona project sites. Two floating LiDAR buoys will be also be deployed, estimated during Q1 2022 (weather dependent), and the vessel will be onsite for a maximum of 24 hours at each site.


Metocean buoys have been successfully deployed within the Morgan and Mona project sites. The equipment will be maintained in position via appropriate mooring systems and will gather metocean data to inform the proposed Project. Details of the devices and relevant Aids to navigation in the attached NtM.

 

Two floating LiDAR buoys will be towed to the Mona Project site and the Morgan project site for deployment which is anticipated to commence in Q1 2022, and the vessel will be onsite for a maximum of 24 hours at each site.

 

The metocean buoys and floating LiDAR equipment will undergo regular scheduled maintenance during the operation period, where vessels may be onsite for 1 day at a time; further notice to mariners will be issued confirming the dates and maintenance activities. During the Floating Lidar servicing it will be towed to port for servicing prior to redeployment. Details of the anticipated scheduled maintenance dates are provided in Section 4 below, please note that these are currently the expected timings.

.

 

All vessels are requested to maintain a safe distance (500m) from the installation vessels (Vital or Vector) at all times. All vessels are requested to maintain a safe distance (200m) from the monitoring equipment at all times.

 

Further details can be found within the attached Notice to Mariners.

 

Floating LiDAR buoy

Morgan MMSI: 992351368

Mona MMSI:  992351369

 

Metocean buoys

 Morgan MMSI: 992351367

 Mona MMSI:  992351366

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Shetland HVDC Link - Presence of HDD Exit Ducts at Noss Head



This notice is issued to make mariners aware of the completion of the HDD operations and the presence of three ducts protruding from the seabed at Noss Head.


The Shetland HVDC link is a critical electricity transmission link and will form part of the electrical transmission grid that is essential to the transport of renewable energy between the locations where it is generated and areas of demand, and the delivery of both Scotland’s and the United Kingdom’s 2030 climate change targets. As part of the installation schedule Horizontal Directional Drilled (HDD) exit points have been installed at Noss Head by NKT, on behalf of Scottish Hydro Electric Transmission.

 

The HDD exit points are located approximately 400m offshore in around 20m depth of water. This Notice is issued to make mariners aware of the presence of three ducts protruding from the seabed at this location.

 

Three steel pipe ducts have been installed with trajectories that emerge from the seabed around 400m offshore. The ducts have been pushed out from each of the three HDD exit points and extend up to 4m into the water column at an angle of approximately 9º to the horizontal as shown in the diagram and illustrations within the attached Notice to Mariners.

 

The HDD installation operations are now complete, and the moorings and anchors used to assist with diving operations for the HDD installation activities have been fully recovered. Therefore, the HDD exit point area is no longer identified by marker buoys.

 

It is recommended that mariners make note of the HDD duct locations and remain vigilant of the seabed protrusions until June 2022, when further installation works are scheduled.

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Landfall Works at Boygrift - Viking Link Project



Mariners are advised about landfall works at Boygrift, Lincolnshire (English Landfall) planned for the Viking Link project which is an HVDC electricity transmission interconnector between Denmark and England, a joint venture between National Grid and Energinet. The cable landfall works include cable repositioning on seabed, diving operations and soil reinstatement.


The marine landfall works are ongoing with expected completion in UK waters by the end of April 2022. The marine landfall works covers cable relocation inside the pre-excavated trench and excavation works. Diving works, including inspection and preparation activities are also foreseen. Round Norwegian marker buoys will mark areas where spoil is temporarily left in place and poses a hazard to navigation.

The works are being managed by Prysmian PowerLink carried out by GPC Cumbria using the following vessels:

  • Severn Supporter Call Sign: MHBD6 (Multicat) - support vessel.
  • Vanishing point 2 Call Sign: 2FYL6 - for diving support & survey activities.

A dedicated guard vessel will be in position to guard the area at the landfall.

 

Vessels are requested to pass at a safe speed and distance and fishing vessels are advised to remain a safe distance, approximately 1000m from the areas identified. Dive works will be ongoing and during the works the vessel will have restricted manoeuvrability as it completes its work scope.

The Communication between the vessels will be through CH67 & 72.

VHF CH 16 will be monitored at all times and will be used to contact the coastguard in the event of an emergency  

 

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Deployment of Floating LiDAR Buoy - Berwick Bank Wind Farm



Mariners are advised that SSE Renewables will be deploying a floating LiDAR Buoy within the proposed Berwick Bank Wind Farm array area.


The LiDAR buoy will measure the wind conditions to provide valuable meteorological data to the offshore community that is needed for offshore wind resource characterisation

 

All locations referred to are outlined in Table 1 and displayed Figure 1 within the Notice to Mariners (provided as an attachment to this notice). These locations are all within the Berwick Bank Wind Farm (BBWF) in the outer Firth of Forth on the east coast of Scotland.

 

Expected arrival on site is 5th to 22nd November 2021 with the works completed the same day, weather conditions permitting. Therefore, we would like the validity period for this Notice to Mariners to be the 01 November 2021 – 30 November 2022 to allow for any eventualities during installation operations and also to cover any ongoing O&M activities throughout the deployment period.

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Seagreen Offshore Windfarm - Foundation Grout Installation



Grout will be installed in the Wind Turbine Generator foundation suction caisson voids within the Seagreen site boundary


On behalf of Seagreen Wind Energy Ltd, Seaway 7 will install grout to the Wind Turbine Generator foundation suction caisson voids within the Seagreen Site Boundary. The vessel EDT Hercules will transport the grouting mix to site and set up at the requisite foundation location. A grout hose will be connected to the suction caisson with the grouting mixture being injected into the caisson void. A remotely operated vehicle (ROV) will also be utilised in this operation.

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Carradale - Arran North and South Subsea Cables Charting Errors



The charted locations of the Carradale to Arran subsea electricity cables in the Kilbrannan Sound may be inaccurate and are being reviewed. Any corrections required will be issued as soon as possible. Mariners should be aware that the true cable locations may be up to ~300m from the presently charted positions. The location of this hazard notice is not indicative of any true cable location and is for information only.


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Areas of Exposure & Suspension - Carradale to Arran North Subsea Cable



Mariners should be aware that the Carradale to Arran North cable has areas of exposure and suspension.


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Seagreen Offshore Wind Farm - Scour Protection Installation



Subsea Scour Protection rock installation will commence on the Seagreen Offshore Windfarm foundation structures within the site boundary.


On behalf of Seagreen Wind Energy Ltd, Seaway 7 will install seabed scour protection rock to the foundation structures within the site boundary. The Flexible Fall Pipe Vessel (FFPV) Bravenes will transport and install the rock on the seabed using its flexible fall pipe system. This allows the scour protection to be installed with a high degree of accuracy. An ROV at the end of the fall pipe will be utilised to control the flow of rock to the seabed.

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Deployment of Wave Data Buoy



Deployment of a temporary Wave Data Buoy. On behalf of Seagreen Wind Energy Ltd. Seaway 7 will deploy a temporary Wave rider buoy to assist the Heavy lift vessel Saipem 7000 to install foundations. The Waver rider buoy will stay on location until the completion of foundation installation phase.


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Carradale - Arran South Subsea Power Cable areas of exposure



Mariners should be aware that the Carradale - Arran South subsea power cable has areas of exposure and suspension.


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Seagreen Offshore Windfarm - Deployment of a Guard Vessel



Due to construction activity commencing within the Seagreen development site a guard vessel will be deployed.


In conjunction with the commencement of wind turbine generator foundation installation activities, Seaway 7 will deploy a site Guard Vessel on behalf of Seagreen Wind Energy Ltd. The vessel will be deployed on or around the 01st October and will make six hourly VHF radio broadcasts containing information regarding the Seagreen development, including installation activity, safety zone information and site demarcation buoyage information. The first guard vessel to arrive will be the Renown FR246.

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Construction work - Seagreen Offshore Windfarm



On behalf of Seagreen Wind Energy, Seaway 7 will commence installation of 114 three legged suction caisson foundation structures. The foundations will be towed from Nigg,Cromarty Firth.On arrival at site the foundations will be installed by the Heavy Lift vessel Saipem 7000.The tug Nicobar will assist the Heavy Lift vessel with barge mooring operations.Foundation grouting operations will take place from the vessel EDT Hercules. Installation is expected to commence on or around 1st October 2021.


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Sanday - Eday subsea cable installation



A new subsea electricity cable between Spurness (Sanday) and London Bay (Eday) has been installed. The cable is surface laid in proximity to the previous and now out of service cable.


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Eday - Westray subsea electricity cable installation



A new subsea electricity cable has been installed between Fersness Bay (Eday) and near Point of Geldibist (Westray). The cable is installed on the seabed in proximity to the previous and now out of service cable


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Wave Buoy Deployment - London Array Offshore Wind Farm



A Wave Rider Buoy will be deployed onsite from 24th September until further notice as part of ongoing monitoring of offshore conditions to support operations. Spectrum Offshore will be engaged to deploy the buoy. Description of wave rider buoy: Yellow spherical buoy, transparent top dome with solar panels and flashing light. Weight: 197kg Size: 1.10m Diameter. The buoy is connected to a subsea weight on a surface line. Vessels are requested to always maintain a 250m clearance around the buoy.


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Construction of Wind Farm - Neart na Gaoithe Offshore Wind Farm Limited



Neart na Gaoithe Offshore Wind Farm Limited (NnGOWL) will commence construction work for Neart na Gaoithe (NnG) Offshore Wind Farm, from the 9th August 2020, with the start of casing and pile installation operations on the wind farm site.


NnGOWL is developing the NnG Offshore Wind Farm, jointly owned by EDF Renewables and ESB, which is located in the outer Firth of Forth, Scotland. The NnG wind farm area is 15 km east off Fife Ness and 29 km from the East Lothian coastline and covers an area of 105 km2

The wind farm consists of 54 no. wind turbines (WTGs) and 2 no. Offshore Substation Platforms (OSPs), with a total capacity of approximately 45 0MW. Water depths across the offshore wind farm area generally range from 40 to 60 m below LAT. The generated power will be transmitted to the grid via two subsea export cable circuits which will reach landfall at Thorntonloch Beach, East Lothian, Scotland. Specific details and location of activities within the Wind Farm Area and Export Cable Corridor will be provided via subsequent notices as work progresses.

 

Buoyage

 

Five special markers are now in position:

 

Name Location

SP 1 - Special Mark - Fl Y 5s light character

56°18.180'N 02°12.075'W

SP 2 - Special Mark - Fl Y 5s light character

56°15.643'N 02°09.329'W

SP 3 - Special Mark - Fl Y 5s light character

56°12.294'N 02°15.796'W

SP 4 - Special Mark - Fl Y 5s light character

56°14.038'N 02°18.975'W

SP 5 - Special Mark - Fl Y 5s light character

56°18.924'N 02°18.951'W

 

Four cardinal buoys are due to be deployed the week commencing 16th March. Planned deployment locations

 

Name Location

NNG - North Cardinal - Quick (Q) white light character

56°20.425'N 02°14.617'W

NNG - East Cardinal - Q (3) 10 s white light character

56°14.329'N 02°08.558'W

NNG - South Cardinal - Q (6) + Long (L) FL 15 s white light character

56°12.294'N 02°09.760'W

NNG - West Cardinal - Q (9) 15 s white light character

56°17.057'N 02°21.084'W

 

A steel chain will be connected to each marker buoy, and the chain will be present through the water column, connected to an anchor placed on the seabed.

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Pentland Floating Offshore Wind SEAWATCH LiDAR Buoy



Fugro have deployed a SeaWatch LiDAR Buoy (SWLB) within the Pentland Firth, located off the north coast of Scotland. The equipment will be deployed for approximately one year and has been moored through a combination of steel chains, rope and rubber cord to approximately 2250 kg anchor weight at the seabed.


Fugro have deployed a SeaWatch LiDAR Buoy (SWLB); this is a sea state measurement instrument (referred to as ‘the equipment’). The deployment location is within the UK Sector of the North Sea off the north coast of Scotland.

  • The equipment was deployed on 29 August 2021, and will be deployed for approximately one year.
  • The equipment's location is provided within the attached Notice to Mariners.
  • Scheduled maintenance of the equipment is planned every six months, but unforeseen maintenance may be required.
  • The equipment has been moored through a combination of steel chains, rope and rubber cord to approximately 2250 kg anchor weight at the seabed.
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Deployment of 2 x Metocean Buoys - North of Cromer



Partrac is to deploy two large metocean buoys (E03 and E13) at two separate locations approximately 18 miles northwest of Cromer and 28 miles north of Cromer in the southern North Sea 


Partrac is to deploy two large metocean buoys (E03 and E13) at two separate locations approximately 18 miles northwest of Cromer and 28 miles north of Cromer in the southern North Sea 

 

Once deployed, please maintain a 500m exclusion around each buoy.

 

Deployment is estimated to be carried out over one day from the 5th May 2021, weather permitting.

 

The deployments will be completed by the vessel Isle of Jura.

 

The surface buoys will include: AIS; A day shape of yellow St Andrews Cross; radar reflector; and yellow navigation light.

 

The metocean buoys record meteorological data and are anchored to the seabed by means of a mooring chain and a ground weight. The buoy has dimensions of 4m x 4m, and when deployed the tallest mast on the buoy sits approx. 4m above the water line  

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