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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
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
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
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:
http://flevy.com/browse/document/sis-and-esd-iec-61511-61508-training-faqs-3092
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
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
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
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
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
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
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
1
Flevy (www.flevy.com) is the marketplace
for premium documents. These
documents can range from Business
Frameworks to Financial Models to
PowerPoint Templates.
Flevy was founded under the principle that
companies waste a lot of time and money
recreating the same foundational business
documents. Our vision is for Flevy to
become a comprehensive knowledge base
of business documents. All organizations,
from startups to large enterprises, can use
Flevy— whether it's to jumpstart projects, to
find reference or comparison materials, or
just to learn.
Contact Us
Please contact us with any questions you may have
about our company.
• General Inquiries
support@flevy.com
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press@flevy.com
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billing@flevy.com

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SIS & ESD (IEC 61511, 61508) Training - FAQs

  • 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 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
  • 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: http://flevy.com/browse/document/sis-and-esd-iec-61511-61508-training-faqs-3092
  • 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 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
  • 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 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
  • 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 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
  • 8. 1 Flevy (www.flevy.com) is the marketplace for premium documents. These documents can range from Business Frameworks to Financial Models to PowerPoint Templates. Flevy was founded under the principle that companies waste a lot of time and money recreating the same foundational business documents. Our vision is for Flevy to become a comprehensive knowledge base of business documents. All organizations, from startups to large enterprises, can use Flevy— whether it's to jumpstart projects, to find reference or comparison materials, or just to learn. Contact Us Please contact us with any questions you may have about our company. • General Inquiries support@flevy.com • Media/PR press@flevy.com • Billing billing@flevy.com