PROVIDENCIALISMO EN LAS "CARTAS" DE BALBOA

101 This subsection presents the parts of DNV ‘Rules for Planning and Execution of Marine Operations’ which are relevant for the temporary phases for wind turbine structures.

D 200 Planning of operations

another according to safe and sound practice, and according to defined codes and standards. The planning of the operations should cover planning principles, documentation and risk evaluation. The planning and design sequence is given in Figure 1.

Figure 1

Planning and design sequence

202 Operational prerequisites such as design criteria, weather forecast, organisation, marine operation manuals as well as preparation and testing should be covered.

203 Requirements to planning of operations are given in ‘DNV Rules for Planning and Execution of Marine Operations, Part 1, Chapter 2.’

D 300 Documentation

301 Acceptable characteristics shall be documented for the handled object and all equipment, temporary or permanent structures, vessels etc. involved in the operation.

Guidance note:

Note that all elements of the marine operation shall be documented. This also includes onshore facilities such as quays, soil, pullers and foundations.

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302 Properties for object, equipment, structures, vessels etc. may be documented with recognised certificates. The basis for the certification shall then be clearly stated, i.e. acceptance standard, basic assumptions, dynamics considered etc., and shall comply with the philosophy and intentions of DNV ‘Rules for Planning and Execution of Marine Operations’.

303 Design analysis should typically consist of various levels with a “global” analysis at top level, and with strength calculations for details as a lowest level. Different types of analysis methods and tools may apply for different levels.

304 Operational aspects shall be documented in the form of procedure, operation manuals, certificates, calculations etc. Relevant qualifications of key personnel shall be documented.

305 All relevant documentation shall be available on site during execution of the operation.

306 The documentation shall demonstrate that philosophies, principles and requirements of DNV ‘Rules for Planning and Execution of Marine Operations’ are complied with.

307 Documentation for marine operations shall be self contained or clearly refer to other relevant documents.

308 The quality and details of the documentation shall be such that it allows for independent reviews of plans, procedures and calculations for all parts of the operation.

Guidance note:

A document plan describing the document hierarchy and scope for each document is recommended for major marine operations.

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Specifications, Standards

Overall Planning

Design Brief & Design Basis

Engineering & Design Verification

309 Applicable input documentation such as: — statutory requirements

— rules

— company specifications — standards and codes — concept descriptions

— basic engineering results (drawings, calculations etc.) — relevant contracts or parts of contracts

should be identified before any design work is performed.

310 Necessary documentation shall be prepared to prove acceptable quality of the intended marine operation. Typically, output documentation consists of:

— planning documents including design briefs and design basis, schedules, concept evaluations, general arrangement drawings and specifications

— design documentation including load analysis, global strength analysis, local design strength calculations, stability and ballast calculations and structural drawings

— operational procedure including testing program and procedure, operational plans and procedure, arrangement drawings, safety requirement and administrative procedures

— certificates, test reports, survey reports, NDE documentation, as built reports, etc.

311 Execution of marine operations shall be logged. Samples of planned recording forms shall be included in the marine operations manual.

312 Further requirements are given in DNV ‘Rules for Planning and Execution of Marine Operations’, Part 1, Chapter 2.

D 400 Vessel stability

401 Sufficient stability and reserve buoyancy shall be ensured for all floating objects in all stages of the marine operations. Both intact and damaged stability shall be documented. For operations where stability and/ or buoyancy at some stage is critical, special consideration shall be given to the duration of the critical condition, the risk of possible hazards and to the mobilisation time for – and amount of – back-up systems

402 Requirements to stability are given in ‘DNV Rules for Planning and Execution of Marine Operations’, Part 1, Chapter 2.

D 500 Systems and Equipment

501 Systems and equipment shall be designed, fabricated, installed and tested in accordance with relevant codes and standards. Systems and equipment shall be based on a thorough consideration of functional and operational requirements for the complete operation. Emphasis shall be placed on reliability and contingency.

502 Requirements for stability are given in ‘DNV Rules for Planning and Execution of Marine Operations’, Part 1, Chapter 2.

D 600 Design loads

601 The design loads are loads or load conditions which form the basis for design and design verification.

602 The design loads include basic environmental conditions like wind, wave, current and tide. The design process involving characteristic conditions, characteristic loads and design loads is illustrated in Figure 2.

Figure 2 Design process

Characteristic

Conditions CalculationsAnalysis & Characteristic Loads

Load Factors

Design Loads

603 The load analysis should take into account dynamic effects and non-linear effects. Permanent loads, live loads, deformation loads, environmental loads as well as accidental loads should be considered.

604 Further requirements are given in DNV ‘Rules for Planning and Execution of Marine Operations’, Part 1, Chapter 3.

D 700 Structural design

701 Prerequisites for structures involved in marine operations shall include design principles, strength criteria for limit state design, testing, material selection and fabrication.

702 Requirements and guidelines are given in DNV ‘Rules for Planning and Execution of Marine Operations’, Part 1, Chapter 4.

E. Marine Operations – Specific Requirements