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Sec.2: Principles and Process [Table of Contents]

DNV-OSS-312 Certification of Tidal and Wave Energy Converters

[-] Sec.3: Documentation

SECTION 3
Documentation

Sec.3
A. General

Sec.3
A 100   Typical documentation and type of service

Sec.3 A
101   In this chapter typical documentation to be submitted in connection with certification of a tidal or wave energy converter is described. The level of detail and areas to be covered will obviously depend on the contractual agreements. It should be noted that for certification of a tidal or wave energy converter there will be a minimum set of areas to be documented in order for DNV to issue a certificate. The areas described in this chapter are covering more than the minimum requirements in this respect.

Sec.3 A
102   Depending on type of device, parts of or whole groups of documentation described in the following will not be relevant. A detailed list reflecting the type of converter and operational mode must therefore be established in each case.

Sec.3
B. Structural design

Sec.3
B 100   Type of installation

Sec.3 B
101   Tidal and wave energy converters may be either fixed or floating, and the construction material may be steel, concrete or composite or a combination. The documentation requirements will vary depending on construction material and type of device.

Sec.3
B 200   Environmental data

Sec.3 B
201   The environmental data used as basis for the design should be submitted. This should include:
—waves
—wind
—current profile and turbulence
—water depths
—tide
—soil conditions
—marine growth, thickness and specific weight
—seismic conditions
—design temperature.

Sec.3
B 300   Floating Tidal and Wave Energy Converters

Sec.3 B
301   Typical documentation to be submitted for verification of the structural design of a floating tidal or wave energy converter will be:
—general arrangement plan
—plans for spaces and tanks
—structural design brief
—design load plan, including design accidental loads
—structural categorisation plan
—structural drawings
—model test documentation
—loading manual
—docking arrangement plan
—fabrication specification, including welding procedures
—design analyses, both global and local design, including temporary phases such as transit
—standard details
—local arrangement plans
—corrosion protection
—opening and closing appliances
—stability, including inclining test procedure, stability manual watertight integrity plans, etc.
—freeboard plan and list of watertight and weather tight items
—description of access for inspection and maintenance of the structure.

Sec.3
B 400   Fixed Tidal and Wave energy converters

Sec.3 B
401   Typical documentation to be submitted for verification of the structural design of a fixed converter will be:
—general description of the design in terms of size and type of structure, layout of equipment, deck elevations, operational loading requirements and design life and construction material
—general arrangement plan
—description of computer programs used in design
—field data in terms of location and orientation of the converter
—soil data and foundation analysis
—description of scour protection system
—structural design brief
—design load plan, including design accidental loads
—structural categorisation plan
—structural drawings
—fabrication specification, including welding procedures
—design analyses, both global and local design, including temporary phases such as transit
—standard details
—local arrangement plans
—corrosion protection
—description of access for inspection and maintenance of the structure.

Foundation and mooring design must be shown by analysis (and testing if necessary) to be sufficient to survive the site conditions and lifetime identified in the basis for certification. This will be confirmed by independent verification by DNV. Internationally recognised standards should be used where relevant.

Sec.3
C. Position keeping

Sec.3
C 100   General

Sec.3 C
101   The position keeping system can be included in the verification of a tidal and wave energy converter. Typically it will comprise the anchors/suction piles, anchoring lines, windlasses and winches on board the converter. The following documentation will typically be submitted:
—line and anchor pattern
—type and weight and dimension of all line segments
—characteristic line strength
—anchor type, size, weight and material specification
—arrangement of fairleads and anchor points/pretensions
—position and weight of buoyancy elements and weight elements
—position and type of connection elements, such as Kenter shackles, D-shackles, and triplates
—windlass, winch and stopper design
—mooring line tensions in ULS and ALS limit states
—fatigue calculations of mooring line segments and accessories
—strength calculations of anchors, windlass components and fairleads
—corrosion allowance.

Sec.3
D. Machinery and Marine Systems

Sec.3
D 100   Floating Installations

Sec.3 D
101   Machinery and marine systems are covered by DNV-OS-D101, Marine and Machinery Systems and Equipment. Typical systems are ballast system, bilge system, fuel system, HVAC system, etc. Documentation for such systems should include:
—functional descriptions
—gear and other equipment used for production of electricity
—piping (or ducting) and instrumentation diagrams
—piping specifications
—control system
—reliability studies for critical systems.

Sec.3
E. Electrical systems

Sec.3
E 100   General

Sec.3 E
101   Electrical systems are covered by DNV-OS-D201, Electrical Installations. The verification of the electrical system on a tidal and wave energy converter will be based on the following typical documentation:
—system description
—line diagram
—generator description
—converter description
—overall single line diagram for emergency power
—principal cable routing sketch
—cable selection philosophy
—load balance
—discrimination analysis
—table of Ex-installation
—electrical system calculations
—battery systems.
—reliability studies for critical systems.

Sec.3
F. Instrumentation and control systems

Sec.3
F 100   General

Sec.3 F
101   Typical documentation for instrumentation and control systems is:
—functional description of control systems
—system block diagrams
—power supply arrangements
—user interfaces
—instrumentation and equipment lists
—arrangement and layouts
—description of functions covered by software
—reliability studies for critical systems.

Sec.3
G. Fire protection and safety systems

Sec.3
G 100   General

Sec.3 G
101   As a general basis for the fire protection and safety systems, a risk analysis should be conducted, where design accidental loads are defined, as well as risk mitigating measures. These loads should cover fire and explosion loads, impact loads from dropped objects and collisions, unintended flooding and loads caused by extreme weather. Based on input from the risk analysis and prescriptive requirements in applicable codes, the following should typically be documented:
—active and passive fire fighting systems
—general arrangement
—emergency shutdown system
—escape routes
—evacuation systems and life saving appliances.
D: Verification of Procured Items [Table of Contents]