---
title: "The Safety Lifecycle"
slug: "the-safety-life-cycle"
updated: 2026-10-27T23:12:18Z
published: 2026-10-27T23:12:18Z
canonical: "ims-handbook.cenosco.com/the-safety-life-cycle"
---

> ## Documentation Index
> Fetch the complete documentation index at: https://ims-handbook.cenosco.com/llms.txt
> Use this file to discover all available pages before exploring further.

# The Safety Lifecycle

![Diagram Description automatically generated](https://cdn.document360.io/e492a0e0-a4ba-4aca-8fc6-76b95f91fdf3/Images/Documentation/SIS-Test_work_order-for-webinar(1).png?sv=2026-02-06&spr=https&st=2026-10-28T15%3A25%3A01Z&se=2026-10-28T16%3A25%3A01Z&sr=c&sp=r&sig=A4EOoV%2BIuUgNaJwo9%2B5yQWjWteoZfEiVXRHYtIJxGzY%3D)The Safety Lifecycle (in IMS SIS).

The Safety Lifecycle, a cyclic process where all hazards are identified and analyzed, can be outlined in a few steps:

- Determining the Hazard Scenario and Consequence (via a [HAZOP study](/v414/docs/overview-hazop)).
- In case of a high Consequence, initiate a [LOPA study](/v414/docs/overview-lopa).
- During the LOPA, based on the Initiating Event frequencies, and Barrier PFDs, calculate the Overall RRF and Overall SIL level for the Consequence.
- Evaluate the Overall SIL to assess the adequacy of the existing Barriers against the Hazard Scenario.
- If the Overall SIL for the Consequence is not acceptable, [start a SIF Analysis](/v414/docs/starting-new-sif-analyses) and determine the SIF’s minimum required RRF, i.e., its Target PFD, that achieves an acceptable Overall SIL level.
- [Design a SIS so that each SIF](/v414/docs/sif-analysis-overview)’s Achieved PFD is less than its Target PFD.
- Lastly [assign the selected Tests](/v414/docs/assigning-tests-to-equipment-schedules) (with their tuned Test intervals) to the associated Equipment’s Schedules to ensure the SIFs achieve the target PFDs.