Safety Integrity Level

Date: 20^th & 21^st May, 2021

SIL Assessment

Safety Instrumented Systems (SIS) are installed in Process Plants to mitigate process hazards by taking the method to a “safe state” when predetermined set points are exceeded or when safe operating conditions have been transgressed. The SIS is one Protection Layer during a multi-layered safety approach since no single precautions alone can eliminate risk. A Layer of Protection Analysis (LOPA) may be a method whereby all known process hazards and every one known layers of protection are closely scrutinized. For each process hazard where the LOPA study concludes that existing protection cannot reduce risk to a suitable or tolerable level, a security Instrumented System is required. Not all process hazards will require the use of a SIS. Each hazard that needs the utilization of an SIS must be assigned a target SIL level. This article is a high-level summary on how SIL levels are determined for process applications.

Tentative program agenda

1. Introduction
2. Layer of protections
3. Definitions
4. What does assessment means
5. Different techniques for SIL assessment
6. Risk Graph methods
7. LOPA methods
8. Independent Protection Layers
9. Risk Matrix
10. Situational modifiers
11. Different Guidewords
12. Risk Assessment
13. Proposed control measure
14. Latest development
15. Hands on & practical session
16. Question & Answer

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