To start creating a Hazard, click on ‘+’.
To perform a SIL Determination, SIL Verification, SRS or Cost Benefit Analysis you’ll need to define a Hazard. SIL Comp® allows you to record all vital information that is required and facilitates full traceability from the Drawing Numbers and Node being analysed.
Tip – Use the Used Text Function to use previous text used in that field within any Hazards in the project.
After creating your Hazard, you can right click on the Hazard to perform the following operations:
- Load Hazard – Conduct the SIL Determination, SIL Verification, Safety Requirement Specification and access the Notes and Recommendations.
- Duplicate Hazard – This will duplicate the Hazard with a new ID, keeping all the information in the SIL Determination, SIL Verification, Safety Requirement Specification and Notes sections.
Note: The SIF Tag will not be copied, as this is a unique field. A default will be used until the new SIF Tag is added.
- Delete Hazard – Delete the Hazard and all of its contents.
Mode of Operation
The module allows differentiation between ‘Low Demand’ Mode of Operation and ‘Continuous’ Mode of Operation.
Low Demand Mode – Where the safety function is only performed on demand, in order to transfer the Equipment Under Control (EUC) into a specified safe state, and where the frequency of demands is no greater than one per year.
Continuous / High Demand Mode – Where the safety function retains the EUC in a safe state as part of normal operation.
Method Of Determination
The SIL Determination can be set to conducting the following methodologies:
- Layers Of Protection Analysis (LOPA) – A semi-quantitative method for assigning Safety Integrity Level (SIL) targets to Safety Instrumented Functions (SIFs).
- Risk Graph – A method for assigning SIL targets to SIFs through combining several parameters that make up the risk graph (Consequence, Exposure Frequency, Avoidance Probability and Initiating Event Frequency)
- Risk Matrix – A method for assigning SIL targets to SIFs through combining the likelihood and severity of the consequence. Then the SIL target is determined from the matrix calibration
- Combinations – Allows for SIL Determination to be carried out using both the LOPA and Risk Graph methods OR LOPA and Risk Matrix methods
The SIL Determination methodology selected will determine the consequences selection in the Hazard setup screen.
Click on the Edit button and the available consequences will be displayed. Use the radio buttons to select the consequences.
LOPA consequences are configured using the Risk Profile Configuration.
Risk Matrix Consequences are configured using the Risk Matrix Configuration.
You can list the relevant Drawing Numbers that are included in the Node. You can enter multiple drawings by clicking “Configure Drawing Numbers”.
Tick the “Assigned” checkbox to assign a preconfigured Drawing Number to the Hazard. Untick the “Assigned” checkbox to remove the Drawing Number.
Click “Add New” to configure a new Drawing Number.
All Drawing Numbers on the project can be reviewed and managed in the Drawing Numbers Manager.
You can list the relevant Sessions in which the Hazard was evaluated. You can enter multiple sessions by clicking “Configure Sessions”.
Tick the checkbox to assign a preconfigured Session to the Hazard. Untick the checkbox to remove the Session. You can only assign preconfigured Sessions.
All Sessions on the project can be reviewed and managed in the Sessions Manager.
You can add the relevant site Structure in which the Hazard is located. You can configure a Site Structure by clicking “Configure Site Structures”.
You can only assign preconfigured Site Structures.
All Site Structures on the project can be reviewed and managed in the Site Structures Manager