The present article discusses the methodology to include potential wind turbine failures in quantified risk assessments (QRA) of transmission pipelines or stations, which is included in the latest version of the Dutch national ‘Handbook on Risk Zoning of Wind Turbines’ (‘Handboek Risicozonering Windturbines’) .
The methodology includes a simple set of wind turbine failure modes and frequencies, probability density functions and failure criteria of the impacted underground pipeline or aboveground station components. Using the methodology, an additional failure frequency can be calculated for a transmission pipeline or a station due to the presence of one or several wind turbines.
The focus of the methodology is not on the physics of each of the separate scenarios (many different studies and approaches are publically available), but as a practical tool for quantified risk assessments and determination of acceptable siting distances for wind turbines near gas infrastructure. The pressure and the (possibly non-uniform) construction parameters and depth of cover of underground pipelines are taken into account in the calculations.
The methodology shown in this article was developed by DNV GL and published in Netherlands Enterprise Agency’s ‘Handbook on Risk Zoning of Wind Turbines’ in May of 2013. Following the publication of this Handbook, a software tool has been developed to implement the calculation method. This software is also discussed in this article.