Enhanced Consequence Modeling with Target Leaks

Enhanced Consequence Modeling with Target Leaks

We're excited to introduce the Target Leaks feature which provides a new capability to calculate and then visualize consequences from subsea releases. This new feature enables you to define fluid leak cases and the associate them with targets, which have fluids associated with them, to calculate potential consequences from fluid releases from the targets.

What Are Target Leaks?

Target Leaks represent potential fluid release scenarios that can occur when targets are damaged by dropped objects. Each leak definition includes:

• Leak Name - A descriptive identifier for the leak scenario
• Leak Size - The size of the leak in mm - used for informational purposes only
• Mass Rate - The fluid release rate in kilograms per second - used in consequence calculations
• Loss Rate - The percentage loss rate (0-100%) of fluid mass in the water column before arriving at the surface - used in consequence calculations

How It Works

The Target Leaks feature integrates seamlessly with DORAS's existing damage assessment workflow:

1. Define Fluids - Create fluids with different properties that will be used in the consequence calculations (as many as you need)
2. Define Targets - Create targets as per normal, which will be associated with the defined fluids (one fluid per target)
3. Define Leaks - Create leak definitions specifying mass rates and other parameters
4. Associate with Targets - Use the Releases interface to assign leaks to specific targets
5. Calculate Pool Sizes - Pool sizes are calculated using the selected methodology in the study definition

Key Benefits

• Consequence Analysis - Model multiple release scenarios for each target, enabling detailed risk assessment
• Bulk Management - Efficiently assign different leaks to different targets using the streamlined Releases interface to show target and fluid specific consequences
• Flexible Configuration - Define custom leak scenarios tailored to your specific analysis requirements
• Automatic Calculations - Release frequencies and pool sizes are automatically calculated based on target damage assessment results
• Methodology Support - Supports multiple pool size calculation methods

Getting Started

To start using Target Leaks in your study:

1. Navigate to the Leaks section in your study
2. Create one or more leak definitions with appropriate mass rates and parameters
3. Go to your Targets list and click the Releases button for any target
4. Assign leaks to targets and configure release parameters
5. Run the plots calculations to generate map layers to visual pool sizes for each target and release scenario

Technical Details

The Target Leaks feature follows DNV-RP-F107 standards for consequence modeling. Release frequencies (R0, R1, R2) are calculated using the target damage frequencies (D1, D2, D3) and pool sizes are determined using established methodologies that account for the following depending on the method chosen:

• Leak mass rate (kg/s)
• Fluid density and properties
• Environmental conditions (i.e. water current)
• Target-specific characteristics

Each release scenario links a leak to a target and fluid, and stores the calculated frequencies and pool sizes, enabling comprehensive visualization and reporting of consequence scenarios.

What's Next?

This feature enhances DORAS's capability to model the full spectrum of dropped object risks, from initial impact through to fluid release consequences. We're continuously improving the application based on user feedback, so please let us know how you're using Target Leaks in your analyses.  For more information about consequence modeling methodologies, please refer to the Methodology page.