8.1 offshore illustrative drawings
DESCRIPTION
Offshore Illustrative DrawingsTRANSCRIPT
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Navitus Bay Development LimitedVersion 1.0
navitusbaywindpark.co.uk
OTHER DOCUMENTS
OFFSHORE ILLUSTRATIVE DRAWINGS
DOCUMENT 8.1
APRIL 2014
Pursuant to Regulations 5(2)(q) of the Infrastructure Planning (Applications: Prescribed Forms and Procedure) Regulations 2009
NAVITUS BAY WIND PARK
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DOCUMENT CONTROL
DOCUMENT PROPERTIES
Author Navitus Bay Development Limited
Title Offshore Illustrative Drawings
Document Reference
8.1
VERSION HISTORY
Date Version Status Description/Changes
10 April 2014 1.0 Final Issued for application submission
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TABLE OF CONTENTS
1. Purpose of this Document ........................................................ 1
1.1 Introduction ........................................................................... 1
1.2 Wind Turbine Generator ........................................................... 2
1.3 Monopile Foundation ............................................................... 5
1.4 Gravity Base Foundation .......................................................... 7
1.5 Space Frame Foundation .......................................................... 9
1.6 Offshore Substation Platform .................................................. 12
1.7 Inter Array Cable .................................................................. 15
1.8 Export Cables ....................................................................... 17
1.9 Meteorological Mast ............................................................... 19
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LIST OF FIGURES
Figure 1.1 - Indicative turbine classes Image not to scale .......................... 4
Figure 1.2 - Illustration of a monopile foundation ......................................... 6
Figure 1.3 - Illustration of a gravity base foundation .................................... 8
Figure 1.4 - Illustration of a space frame foundation .................................. 11
Figure 1.5 - Offshore substation platform at Prinses Amaliawindpark, The
Netherlands ........................................................................ 13
Figure 1.6 - Example of an installation of an Offshore Substation Platform
by a Sheer Leg .................................................................... 14
Figure 1.7 - An inter array cable .............................................................. 16
Figure 1.8 - Cross-section on an export cable ............................................ 18
Figure 1.9 A picture of a meteorological mast structure ........................... 20
Figure 1.10 - Diagram of an offshore wind farm ......................................... 21
Figure 1.11 - Offshore process in the development, installation and
operation of a Round 3 wind farm .......................................... 22
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1. Purpose of this Document
1.1 Introduction
1.1.1 This document contains illustrations, drawings, photographs and
images associated with the proposed offshore elements of the
Navitus Bay Wind Park (the Project). These are provided as
additional information to support the Project application to the
Planning Inspectorate (PINS) for a Development Consent Order
(DCO).
1.1.2 The final layout and design of the Project cannot be fixed until
the final optimisation and design process has been completed
post-consent. Therefore for this reason, the consent applied for
contains a range of design flexibility, limited by the parameters
set out in the draft DCO (Document 3.1). The need for this
flexibility is set out in Volume B, Chapter 2 Offshore Project
Description of the Environmental Statement (ES) (Document
6.1).
1.1.3 The illustrative information included in this document is intended
to assist in understanding how the form of the development
might appear taking account of the offshore parameters set out
in the draft DCO and the range of flexibility described in more
detail in Volume B, Chapter 2 of the ES. Specifically, this
document contains the following illustrative information:
illustration of a 5MW turbine class;
illustration of a 6MW turbine class;
illustration of an 8MW turbine class;
illustration of a monopile foundation;
illustration of a gravity base foundation;
illustration of a space frame foundation;
picture of the offshore substation platform at Prinses
Amaliawindpark, The Netherlands;
example of an installation of an offshore substation platform;
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inter-array cables;
export cables;
picture of a meteorological mast structure;
diagram of an offshore wind farm (Figure 1.10); and
illustrative offshore process in the development, installation
and operation of a Round 3 wind farm (Figure 1.11).
1.1.4 It should be noted that the final form of the development may
vary from the illustrations contained herein, within the limits set
out by the draft DCO, and as such the enclosed information
should be referred to as illustrative only.
1.1.5 The illustrations enclosed are not intended to qualify as plans
under the definitions set out by the Applications (Prescribed
Forms and Procedures) Regulations 2009, Regulation 5(2) and as
such do not need to comply with the requirements of Regulation
5(3) with regard to scaling. Note the illustrations included in this
document are not drawn to scale (although some of the
illustrative sections show relevant dimensions).
1.2 Wind Turbine Generator
1.2.1 Indicative wind turbine classes are shown in Figure 1.1.
1.2.2 The following definition for the wind turbine generator (WTG) is
included in the draft DCO:
"wind turbine generator" or "WTG" means a structure
comprising a tower, rotor with three horizontal axis blades
connected at the hub, nacelle containing mechanical and
electrical equipment, ancillary equipment including
access ladders and platforms, lifts, cables, corrosion
protection systems, maintenance equipment, helihoist
facilities and other associated equipment, fixed to a
foundation.
1.2.3 The parameters for the WTG in the draft DCO are as follows:
a) Subject to paragraph (2), no wind turbine generator forming
part of the authorised development may
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i. exceed a height of 200 metres when measured from LAT
to the tip of the vertical blade;
ii. exceed a height of 112 metres when measured from LAT
to the height of the centreline of the generator shaft
forming part of the hub;
iii. exceed a rotor diameter of 176 metres;
iv. be less than 756 metres from the nearest WTG in either
direction perpendicular to the approximate prevailing
wind direction (crosswind) or be less than 1,008 metres
from the nearest WTG in either direction which is in line
with the approximate prevailing wind direction
(downwind); and
v. have a distance of less than 22 metres between the
lowest point of the rotating blade of the wind turbine and
mean high water spring (MHWS).
b) References to the location of a wind turbine generator are
references to the centre point of the tower of that WTG.
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Figure 1.1 - Indicative turbine classes Image not to scale
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1.3 Monopile Foundation
1.3.1 An indicative drawing of a monopile foundation is shown in
Figure 1.2.
1.3.2 A monopile foundation can support the WTGs and the
meteorological mast.
1.3.3 The following definitions for the monopile foundation are included
in the draft DCO:
"steel monopile foundation" means a steel, concrete, or steel and
concrete large diameter pile, typically cylindrical, driven and/or
drilled into the seabed or fixed to the seabed with suction
caissons, including associated scour protection, transition piece, J-
tubes, corrosion protection systems, boat landings comprising an
access ladder with vertical boat fenders fitted either side, access
and work platforms and equipment;
"suction caisson" means a steel cylindrical structure which is
fixed to the base of the foundation and partially or completely
penetrates the seabed and remains in place using its own weight
and hydrostatic pressure differential.
1.3.4 The parameters for the monopile foundation in the draft DCO are
as follows:
a) Each steel monopile foundation forming part of the authorised
development may be attached to the seabed using piles or
suction caisson and
i. Each piled steel monopile foundation must not have a
diameter more than 8 metres;
ii. Each suction caisson steel monopile foundation must not
have
a diameter at the level of the seabed which is more
than 20 metres;
a base height, where there is a flat base, which is
more than 20 metres; and
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more than one suction caisson per
foundation.
Figure 1.2 - Illustration of a monopile foundation
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1.4 Gravity Base Foundation
1.4.1 An indicative drawing of a gravity base foundation is shown in
Figure 1.3.
1.4.2 A gravity base foundation can support the WTGs, the Offshore
Substation Platforms and the meteorological mast.
1.4.3 The following definition for the gravity base foundation is
included in the draft DCO:
"gravity base foundation" means a structure principally of
concrete or steel and concrete which rests on the seabed due to
its own weight with or without added ballast or skirts, including
associated sea bed preparation, scour protection, J-tubes,
corrosion protection systems, boat landings comprising an access
ladder with vertical boat fenders fitted either side and work
platforms and equipment;
1.4.4 The parameters for the gravity base foundation in the draft DCO
are as follows:
a) Each gravity base foundation forming part of the authorised
development must not have
i. a diameter at the level of the seabed which is greater
than 45 metres;
ii. a column diameter which is greater than 8 metres;
iii. a cone/column intersect which is higher than 32 metres
above the top of the seabed; and
iv. a cone diameter at its base which is greater than 45
metres.
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Figure 1.3 - Illustration of a gravity base foundation
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1.5 Space Frame Foundation
1.5.1 An indicative drawing of a space frame foundation is shown in
Figure 1.4.
1.5.2 A space frame foundation can support the WTGs, the Offshore
Substation Platforms and the meteorological mast.
1.5.3 The following definitions for the space frame foundation are
included in the draft DCO:
"space frame foundation" means a jacket lattice type structure
constructed of concrete, steel or steel and concrete which is fixed
to the seabed at three or more points with driven or pre-installed
piles or suction caissons, including associated scour protection,
J-tubes, corrosion protection systems, boat landings comprising
an access ladder with vertical boat fenders fitted either side,
access and work platforms and equipment;
"suction caisson" means a steel cylindrical structure which is
fixed to the base of the foundation and partially or completely
penetrates the seabed and remains in place using its own weight
and hydrostatic pressure differential.
1.5.4 The parameters for the space frame foundation in the draft DCO
are as follows:
a) Each space frame foundation forming part of the authorised
development must not have
i. a width spacing between each leg at the level of the
seabed which is greater than 35 metres; and
ii. more than 4 legs.
b) Each space frame foundation forming part of the authorised
development may be attached to the seabed using piles or
suction caisson and
i. each piled space frame foundation must not have
a pile diameter which is more than 3.5 metres;
and
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more than one pile per leg.
ii. Each suction caisson steel space frame foundation must
not have
a diameter at the level of the seabed which is more
than 15 metres;
a base height, where there is a flat base, which is
more than 20 metres; and
more than one suction caisson per leg.
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Figure 1.4 - Illustration of a space frame foundation
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1.6 Offshore Substation Platform
1.6.1 The following definition for the offshore substation platform is
included in the draft DCO:
"Offshore Substation Platform" means an offshore platform
constructed of steel or concrete or steel and concrete with single
or multiple decks housing major electrical equipment including
high voltage transformers, switchgear, control rooms, cabling
and busbars, lightning protection masts, communications masts,
cable management, back-up generators, fuel storage,
emergency accommodation, workshops and stores, helidecks or
helihoist facilities, cranes and other associated electrical and
ancillary equipment.
1.6.2 The parameters for the Offshore Substation Platforms in the
draft DCO are as follows:
a) the total number of offshore substation platform forming
part of the authorised scheme must not exceed three;
b) the dimensions of any offshore substation platform forming
part of the authorised scheme (excluding helipads, towers,
masts and cranes) must not exceed 50 metres in height
when measured from LAT, 45 metres in length and 45
metres in width; and
c) each offshore substation platform must have no more than
one supporting foundation.
1.6.3 A picture of the offshore substation platform at Prinses
Amaliawindpark is given in Figure 1.5.
1.6.4 An example of an installation of an offshore substation platform
by a Sheer Leg is given in Figure 1.6.
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Figure 1.5 - Offshore substation platform at Prinses Amaliawindpark, The Netherlands
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Figure 1.6 - Example of an installation of an Offshore Substation
Platform by a Sheer Leg
(courtesy of Belwind)
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1.7 Inter Array Cable
1.7.1 The inter array cables are laid between the turbines and will;
be Alternating Current (AC), operating at a voltage of 66kV,
33kV or 11kV;
be steel armoured, 3-core cables with XLPE insulation;
have a conductor which will be either copper or aluminium
with cross sections up to 800 mm2; and
have integrated optical fibre cables for data transmission.
1.7.2 An inter array cable is shown in Figure 1.7.
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Figure 1.7 - An inter array cable
CopyrightNexans Norway
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1.8 Export Cables
1.8.1 The High Voltage export cables will connect the offshore
substation platforms to the shore and will;
be Alternating Current (AC) operating at a voltage level of up
to 275kV;
the number of cables required will be between three and six,
depending on the final design and cost detailed cost analysis;
be armoured, 3-core cables with XPLE insulation;
have a conductor which will be either copper or aluminium
with cross sections up to 1600mm2; and
have export cables with integrated optical fibre cables for data
transmission.
1.8.2 A cross-section of an export cable is shown in Figure 1.8.
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Figure 1.8 - Cross-section on an export cable
CopyrightNexans Norway
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1.9 Meteorological Mast
1.9.1 The following definition for the meteorological mast is included in
the draft DCO:
"meteorological mast" means a lattice tower housing or
incorporating equipment to measure wind speed and other wind
characteristics, including a service platform housing electrical
and communication equipment and associated equipment,
oceanographic equipment and connecting cable, and marking
and lighting;
1.9.2 The parameters for the meteorological mast in the draft DCO are
as follows:
a) No lattice tower forming part of a meteorological mast shall
exceed a height of 120 metres above LAT;
b) Each meteorological mast must have no more than one
supporting foundation.
1.9.3 A picture of a meteorological mast structure is given in Figure
1.9.
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Figure 1.9 A picture of a meteorological mast structure
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Figure 1.10 - Diagram of an offshore wind farm
CopyrightEDF Energies Nouvelles
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Figure 1.11 - Offshore process in the development, installation and operation of a Round 3 wind farm
(Reproduced with the permission of The Crown Estate and BVG
Associates)
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