Adding a model

Purpose

(Single) EFFECTS models use an EFFECTS model for consequence calculations to describe a single phenomenon, such as jet fire, pool fire, or toxic dispersion.

Usage

• Calculate effects such as heat radiation, toxic damage​ and overpressure.

• Requires the definition of corresponding probabilities in the phenomenon’s base frequency.

• Requires the calculation of previous steps (e.g., release, evaporation, etc.) to be carried out in other consequence modelling programs like EFFECTS.

Procedure

• Right-click in the ‘‘Equipment’’ node to open a pop-up menu.

• Move the cursor at <Add scenario> → <Fire/Explosion/Dispersion>.

• Select the appropriate model.

• The Scenario consisting of 2 nodes will be created:

  • Failure frequencies and associated probabilities: These represent the likelihood of different types of failures occurring and are available in the upper node.

  • Consequence model: Calculates the potential effects and damage resulting from the failures, and is available in the lower node.

• Fill in input parameters and press ''Calculate’’.

Alternatively, you can copy-paste consequence models from EFFECTS into RISKCURVES, but failure frequencies need to be defined separately.

Purpose

Combined EFFECTS models describe multiple phenomena within a single release scenario.

Usage

• Use combined EFFECTS models to calculate the entire chain of events in RISKCURVES. For instance, for a given set of process conditions, all relevant phenomena such as release, evaporation, dispersion, etc. will be calculated.

• Allows entering event probabilities for all possible events at once in the input fields.

• RISKCURVES automatically links models and combines released mass sources (e.g., Liquefied Gas LOC scenarios resulting in a flash and liquid spill will combine airborne mass from the pool evaporation source and spray source into a dispersion model).

Procedure

• Right-click at the ‘‘Equipment’’ node to open a pop-up menu.

• Move your cursor at <Add scenario> → <Combined models>.

• Select the appropriate model.

• The Scenario consisting of 2 nodes will be created:

  • Failure frequencies and associated probabilities: These represent the likelihood of different types of failures occurring, and can be found in the upper node.

  • Consequence model: Calculates the potential effects and damage resulting from the failures, and can be found in the lower node.

• Fill in input parameters and press ‘‘Calculate’’.

Purpose

The footprint importer allows the import of consequence results from other consequence modelling software tools at once.

Usage

• No direct consequence calculations are available within RISKCURVES

• Utilizes the Footprint Importer tool found in the Calculation set dropdown.

Procedure

Follow the steps in the article Importing footprints from other software.

Purpose

Describes a single event such as jet fire, pool fire or fireball. Uses consequence results from pre-calculated footprint data (which can be threshold or lethality based).

Usage

• No direct consequence calculations within RISKCURVES.

• Based on already calculated consequence levels or lethality distances from previous EFFECTS calculations or other consequence modelling tools.

• Includes event probability in the base frequency.

Procedure

Follow the steps in the Footprint definition scenario article