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IEC 61508 Standard – What is it?IEC 61508 Standard – What is it?

IEC 61508 is a Standard for the functional safety of Electric / Electronic / Programmable Electronic (E/E/PE) Safety related systems

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IEC 61508 - Overall Safety LifecycleIEC 61508 - Overall Safety Lifecycle

Overall Installation and commissioning

Decommissioning or disposal

Overall operation and maintenance and repair

12

16

14 Overall modification and retrofit

15

Back to appropriateoverall safetylife cycle phase

Safety related systems: E/E/PES

9Realization (see E/E/PES

safety lifecycle)

External risk reduction facilities11

Realization

Safety related systems: other technologies

Realization

10Overall operation & maintenance planning

6

Overall planning

Concept

Overall scope definition2

1

Hazard and risk analysis

Overall safety requirements4

3

Safety requirements allocation5

Overall validation planning

7

Overall installation and commissioning

planning

8

Overall safety validation13

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Purpose of IEC 61508 Purpose of IEC 61508

To provide a right safety system for the facility and to avoid under protection and over protection, both of which costs money.

Under protection results in increased risk cost while, Over protection results in higher procurement and maintenance cost.

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IEC 61508 – Where recommended? IEC 61508 – Where recommended?

Following are the areas in the process industry that IEC61508 is applicable:

•Emergency Shutdown System (ESD).

•Fire & Gas System (F&G).

•Turbine Control.

•Burner Management.

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Functional Safety Assessment – What is it? Functional Safety Assessment – What is it?

1. Safety System Project has various phases in its lifecycle.

2. Functional Safety Assessment is a critical activity that checks and reviews output of each phase to make sure that the Functional Safety has actually been achieved.

3. Based on the Risk level (Safety Integrity Level) an Independent person or an independent organization is required to carry out Safety Assessment.

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Functions of Assessment Functions of Assessment

1. To review that hazard and risk assessments and make sure their recommendations implemented or resolved.

2. To make sure the Safety Instrument System is designed, constructed and installed in accordance with Safety Requirements Specifications.

3. To review Safety Validation Planning and make sure all Validation activities have been completed.

4. To make sure recommendations from previous assessments and audits are resolved, and plans for future are in place.

5. Outputs of assessments are in the form of recommendations.

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Safety System Audits Safety System Audits

Functional Safety System Audits are part of Functional Safety Assessment, applicable to Operation, Maintenance and Repair phase of the lifecycle.

This makes sure that all the Safety Assessment functions are complied with and documented.

This also makes management and staff aware of degree of implementation and effectiveness of their Safety Instrument System.

This should be a periodic (say, once in three years), systematic and independent examination.

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Safety System Audit - Reports Safety System Audit - Reports

The outputs of Safety System Audits are in the form of reports.

These are in the form of action plans for improvement and Safety Instrument System(SIS) implementation as per IEC standards.

These reports shall be verifiable.

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Facility HSE Audit Facility HSE Audit

Safety Instrument System Audits can be part of HSE audit as called for in EPA and OSHA.