Safety Integrity Level

ALD offers vast expertise in providing organizations of various industries, with SIL (Safety Integrity Level) services, analysis and reports.

SIL (Safety Integrity Level) is a way to indicate the tolerable failure rate of a particular safety function.
SIL (Safety Integrity Level) is a measure of the safety risk of a given process.
SIL (Safety Integrity Level) process identifies all process hazards, estimates the risk of specific failure.

SIL is divided into 4 levels of safety (1-4); each level represents an order of magnitude of risk reduction.
SIL levels are used when implementing a SIF (Safety Instrumented Function) that must reduce an existing intolerable process risk level to a tolerable risk range.

The assignment of the target SIL is a decision requiring the extension of the Hazard Analysis. It’s based on the amount of risk reduction that is necessary to maintain the risk at an acceptable level. Various methodologies, such as Fault Tree Analysis and Markov Analysis, are used for assignment of target SILs.

The following standards use SIL as a measure of safety, reliability and/or risk reduction:
• ANSI/ISA S84 (Functional safety of Safety Instrumented Systems for the process industry sector)
• IEC EN 61508 (Functional Safety of electrical/electronic/programmable electronic safety related systems)
• IEC 61511 (Safety Instrumented Systems for the process industry sector)
• IEC 62061 (Safety of machinery)
• EN 50128 (Railway applications – Software for railway control and protection)
• EN 50129 (Railway applications – Safety related electronic system for signaling)
• EN 50402 (Fixed gas detection systems)
• MISRA, various (Guidelines for safety analysis, modelling, and programming in automotive applications)
• Defense Standards 00-56 Issue 2 – accident consequence

Contact ALD for more info and support regarding SIL (Safety Integrity Level):
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