This Slideshare presentation is a partial preview of the full business document. To view and download the full document, please go here: http://flevy.com/browse/business-document/sis-and-esd-iec-61511-61508-training--faqs-3092 DOCUMENT DESCRIPTION The full course on Safety Instrumented Systems (SIS) and Emergency Shutdown (ESD), in accordance with the IEC 61511 and IEC 61508 standards and boiler/gas turbine control safety instrumented systems, consists of 19 training modules. This document refers to the 19th training module only, which is a compilation of FAQs: 1. What is a SIS? 2. What is a SIF? 3. What is SIL? 4. What does functional safety mean? 5. Why were the ANSI/ISA 84, IEC 61508, and IEC 61511 standards developed? 6. When do I need a SIF or a SIS? 7. What is a proof-test interval? 8. What is a Process Hazard Analysis (PHA) and who conducts this? 9. What voting configurations are required for each SIL level? 10. Will a SIL rated system require increased maintenance? 11. Can a F&G system be a SIF or SIS? 12. What is SIL 4? 13. Can an individual product be SIL rated? 14. What are the process plant requirements for devices used in SIS loops when IEC 61508 is applied? 15. What type of communication buses or protocols are applicable for SIL 2 or SIL 3 systems? 16. Can a field mounted device be SIL approved by TÜV, FM, or Exida for SIS applications? 17. What changes can be expected in the future? Upon the successful completion of the full SIS/ESD course (all 19 modules), you will be able to: * Apply a comprehensive knowledge in safety instrumented systems (SIS) and emergency shutdown in accordance with the IEC 61511 and IEC 61508 standards and boiler/gas turbine control safety instrumented systems * Differentiate safety instrumented systems, control system, and ESD system * Review the concepts and requirements of IEC 61511 and IEC 61508 standards * Determine the safety integrity level (SIL), as well as recognize technology choices and reliability analysis * Perform proper initial system evaluation and discuss the issues related to field devices * Explain safety systems engineering and carryout system installation covering factor acceptance testing, validation, site acceptance tests, functional safety assessment, pre-start-up safety review, handover to operations, start-up, and post start-up activities * Recognize the need for functional testing and define hazards and risks * Illustrate SIS design for gas turbines, gas compressors, and gas stations, as well as SIS design for waste heat boilers We can also furnish additional materials via email relevant to your purchased document(s). For an additional fee, we can provide technical support to relevant engineering projects.

1. XRS Consulting Engineers and Project
Managers 1
Section 19
Safety Instrumented Systems (SIS) & Emergency Shutdown
(IEC 61511 & IEC 61508) and Boiler/Gas Turbine Control
Safety Instrumented Systems
Section 19
Addendum

2. XRS Consulting Engineers and Project
Managers 4
Section 19
Safety Instrumented Systems (SIS) & Emergency Shutdown
(IEC 61511 & IEC 61508) and Boiler/Gas Turbine Control
Safety Instrumented Systems
2. What is a SIF?
SIF stands for Safety Instrumented Function.
A SIF is designed to prevent or mitigate a hazardous
event by taking a process to a tolerable risk level.
A SIF is composed of a combination of logic solver(s),
sensor(s), and final element(s).
A SIF has an assigned SIL level depending on the amount
of risk that needs to be reduced.
One or more SIF’s comprise a SIS.
Frequently Asked Questions
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3. XRS Consulting Engineers and Project
Managers 7
Section 19
Safety Instrumented Systems (SIS) & Emergency Shutdown
(IEC 61511 & IEC 61508) and Boiler/Gas Turbine Control
Safety Instrumented Systems
4. What does functional safety mean?
Functional safety is a term used to describe the safety
system that is dependent on the correct functioning of
the logic solver, sensors, and final elements to achieve
the desired risk reduction level.
Functional safety is achieved when every SIF is
successfully carried out and the process risk is reduced
to the desired level.
Frequently Asked Questions
This document is a partial preview. Full document download can be found on Flevy:
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4. XRS Consulting Engineers and Project
Managers 10
Section 19
Safety Instrumented Systems (SIS) & Emergency Shutdown
(IEC 61511 & IEC 61508) and Boiler/Gas Turbine Control
Safety Instrumented Systems
7. What is a proof-test interval?
Proof testing is a requirement of safety instrumented
systems to ensure that everything is working and
performing as expected.
Testing must include the verification of the entire
system, logic solver, sensors, and final elements.
The testing frequency varies for each SIS and is
dependent on the technology, system architecture, and
target SIL level. The proof-test interval is an important
component of the probability of failure on demand
calculation for the system.
Frequently Asked Questions
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http://flevy.com/browse/document/sis-and-esd-iec-61511-61508-training-faqs-3092

5. XRS Consulting Engineers and Project
Managers 13
Section 19
Safety Instrumented Systems (SIS) & Emergency Shutdown
(IEC 61511 & IEC 61508) and Boiler/Gas Turbine Control
Safety Instrumented Systems
10.Will a SIL rated system require increased maintenance?
SIL solutions are certainly not always the most cost-
effective solutions for decreasing process risk. Many
times, implementing a SIL solution will require
increased equipment, which inevitably will require
increased maintenance.
Additionally, it is likely that the higher the SIL level,
the more frequent the proof testing interval will be,
which may ultimately increase the amount of system
maintenance that is required. This is why the
standards recommend a SIL based solution only when
process risk cannot be reduced by other methods.
Frequently Asked Questions
This document is a partial preview. Full document download can be found on Flevy:
http://flevy.com/browse/document/sis-and-esd-iec-61511-61508-training-faqs-3092

6. XRS Consulting Engineers and Project
Managers 16
Section 19
Safety Instrumented Systems (SIS) & Emergency Shutdown
(IEC 61511 & IEC 61508) and Boiler/Gas Turbine Control
Safety Instrumented Systems
13. Can an individual product be SIL rated?
No. Individual products are only suitable for use in a
SIL environment.
A SIL level applies to a Safety Instrumented Function /
Safety Instrumented System.
Frequently Asked Questions
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7. XRS Consulting Engineers and Project
Managers 19
Section 19
Safety Instrumented Systems (SIS) & Emergency Shutdown
(IEC 61511 & IEC 61508) and Boiler/Gas Turbine Control
Safety Instrumented Systems
16. Can a field mounted device be SIL approved by TÜV,
FM, or Exida for SIS applications?
The end user must define the level of SIS required for
the application and determine the level of
documentation required.
What can be said is that the transmitters are suitable
for use in SIS applications with a specific SIL
classification.
Frequently Asked Questions
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http://flevy.com/browse/document/sis-and-esd-iec-61511-61508-training-faqs-3092

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