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Environmental conditions and environmental loads DNVGL­-RP-C205


Year: 2019
Language: english
Author: DNV GL AS
Genre: Methodological guide
Publisher: DNVGL­
Edition: September 2019 - Amended December 2019
Format: PDF
Quality: eBook
Pages count: 252
Description: Environmental conditions and environmental loads DNVGL­-RP-C205
1.1 Introduction
Environmental conditions cover natural phenomena, which may contribute to structural damage, operation
disturbances or navigation failures. The recommended practice (RP) is based on state of the art within
modelling and analysis of environmental conditions and loads and technical developments in recent research
and development projects, as well as design experience from projects.
The basic principles applied in this RP are in agreement with the most recognized rules and reflect industry
practice and latest research.
This RP provides background for environmental conditions and environmental loads applied in DNV GL's
standards and recommended practices and is considered to be a supplement to relevant national (e.g.
NORSOK) and international (e.g. ISO) rules and regulations.
Guidance on environmental conditions is given in Sec.2, Sec.3 and Sec.4, while guidance on the calculation
of environmental loads is given in Sec.5, Sec.6, Sec.7, Sec.8 and Sec.9. Hydrodynamic model testing is
covered in Sec.10.
1.2 Objective
The objective of this RP is to provide rational design criteria and guidance for assessment of loads on marine
structures subjected to wind, wave and current loading.
1.3 Scope
This recommended practice gives guidance for modelling, analysis and prediction of environmental
conditions, and guidance for calculating environmental loads acting on marine structures. The most important
natural phenomena covered in this document are:
— wind
— waves
— current
— tides.
Phenomena, which may be important in specific cases, but not covered by this RP include:
— ice
— earthquake
— soil conditions
— temperature
— fouling
— visibility.
The RP provides models for statistical description of the environmental conditions, both short­term statistical
models for each weather condition and general long­term statistical models for describing the metocean
climate at a specific site. Probability distributions for single metocean parameters and joint distributions are
presented for establishing design load conditions for different limit states. The RP also covers requirements to
measurement of environmental parameters. The guidance on load calculations involves simple methods for
hand calculations as well as state­of­the­art numerical methods for more complete physical models.
1.4 Application
This recommended practice is applicable to design of marine structures, including ships, fixed and floating
offshore structures, mobile offshore units, and marine renewables. The document may be useful for design
of new structures by engineering contractors, organisations carrying out third party verification, and by
engineers assessing life time extension of existing marine structures.

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