VISION

1
VISION TO DELIVER FINANCE GRADE METOCEAN DATA
WITH PROVEN WIND LIDAR ON A STABLE FLOATING
PLATFORM IN A COST EFFECTIVE AND SAFE MANNER
2

• SeaZephir Design

• ZephIR Continuous wave lidar

• History of accurate and reliable ZephIR lidar
  data onshore
• Track record of accurate and reliable ZephIR
  lidar data from fixed offshore platforms
• Continuous Wave lidar less susceptible to motion
  induced errors and tilt identified as a
  significant factor
• Therefore the easiest way to deliver industry
  acceptable ZephIR lidar data with a high level of
  confidence was to restrict the motion of any
  floating platform

3

• Floating Continuous Wave lidar

• Early Trials of ZephIR to ZephiR - 2009

• Norwegian Island and Floating lidar
• 15m water depth
• 800m separation

THEORETICAL EFFECT OF TILT ON DATA

• Low frequency periodic tilt (0.01 Hz)
• The averaging effect of a periodic (sinusoidal)
  tilt motion reduces the error by a factor of
  approximately 2, relative to the static case. For
  the cases of static and low frequency periodic
  tilt, vertical wind speed has no effect except at
  very high tilt angles. For tilt less than 5,
  bias is seen as 0.25 or less

4

• Motion Induced Error

• Effect of wave motion on wind lidar measurements
• - Comparison testing with controlled motion
  applied

• Christian Michelsen Research AS (Jon Hellevang)
• Explored comparison test between pulsed and
  continuous wave lidar systems subject to
  controlled wave motion
• Bosch Rexroth Boxtel 6 DOF E-Motion 1500

Effect of wave motion on SeaZephIR measurements

• Motion experienced by the Platform ZephIR ranging
  between 3 degrees and 5 degrees of tilt from
  vertical (heel) at a frequency between 0.1 and
  0.2 Hz
• Outside of these parameters the ZephIR performed
  very well and subsequently Fugro Oceanor
  developed and tested a free floating ZephIR buoy

5

• SeaZephIR Stability and testing

• Testing

Stability

• Lateral acceleration of the order of 0.3 g. with
  vertical accelerations of 0.1 g
• Less than 5 Degrees heel 95 of the time
• Relative positions of the centre of gravity and
  centre of buoyancy ensure minimal movement in any
  direction
• Predictable pattern of behaviour

• 3 Prototypes
• Model Simulations and Tank Tests
• System Testing
• System Validation
• Commercial Deployment including the following
  validation

SeaZephIR has since experienced HSig 5.12m
HMax 8.50m
6

• SeaZephIR System Description

sYSTEM

• General principle of operation
• Motion restricted, Tension leg , Gravity base
  foundation
• Designed for 1 in 50 year storm, 20m water
  depth, 14m Hmax, 6.6m Hsig (adaptable design
  to vary form this)

• Equipment

• Lidar System / Lidar Met Station, Computer /
  Network Switch / Access Point, Wifi Antenna,
  Fleet Broadband Antenna, Mast Camera / Camera And
  Output Control Unit, Motion Sensors, External
  Hard Drive, Battery Monitoring System, Wave Radar
  / Wave Radar, Modem, Met Logging System, Radar
  Transponder, Nav Light, Forced Ventilation
  System, Lighting

Power Supply

• Subject to site audit optimised for specific
  site, generation and demand
• Combination of PV and wind generation
• 20 Lifeline AGM 8D batteries configured as 2550Ah
  _at_ 24, giving 10 day redundancy period
  respectively.
• Battery equaliser and battery monitoring system

7

• Deployment

• Permitting

• Marine Licence EIA unlikely but consult for
  local sensitivities
• IALA Compliance/NavAids lights, markings, etc

Vessel

• Crane barge/vessel with 4 point anchoring system
• Crane capacity of 100Te at required reach
• lt24 hour installation/relocation
• Full Engineering, Procurement, Construction and
  Installation available

MAINTENANCE

• Watchdog System checks every 100 seconds
• 6 monthly routine visits visual checks, washer
  fluid
• Trouble shooting communications,
  instrumentation
• Recovery two yearly overhaul