Defines the criteria for weather windows, wave heights, and current loads during operations.
This is the heart of the standard. It prescribes how to compute: dnvglstn001 pdf
This standard does not cover site-specific assessments for MODUs, which are covered by the companion standard (this is a key exception noted in the standard's scope). Defines the criteria for weather windows, wave heights,
| Section | Title | Key Content / Legacy Replaced | | :--- | :--- | :--- | | | Introduction | Foundational information, scope, and normative references. | | Sec.2 | Planning and execution | Project management, risk assessment, and operational procedures. Replaces parts of DNV-OS-H101 and GL Noble Denton 0001/ND. | | Sec.3 | Environmental conditions and criteria | Requirements for wind, waves, current, and other environmental loads. | | Sec.4 | Ballast and other systems | Operational systems and procedures for load transfer and flotation. Replaces parts of DNV-OS-H201 and several GL Noble Denton guidelines. | | Sec.5 | Loading and structural strength | Covers global and local structural strength assessments for transportation and installation. | | Sec.6 | Gravity based structure (GBS) | Specific requirements for concrete GBS construction and installation. Replaces GL Noble Denton 0015/ND and DNV-OS-H201. | | Sec.7 | Cables, pipelines, risers and umbilicals | Specific operational requirements for subsea infrastructure. | | ... (Further sections) | ... | The standard includes detailed sections on specific asset types (jackets, topsides, FPSOs, etc.) and operations like load-out, transportation, and installation. | | Section | Title | Key Content /
This foundational section outlines the document's scope, the legacy standards it replaces, and the general principles for its use.
DNV offers a digital "Wizard" that allows users to input their specific project details (e.g., asset type, operation) to generate a tailored, condensed document containing only the relevant sections of the 800-page standard.
The standard demands you use a 100-year return period for extreme conditions during transport, but a 10-year return period for operational conditions. Many novice engineers use 100-year values for both, resulting in over-engineered (and financially unviable) designs.
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