exida explains Blog

Entries tagged with: IEC 61511

Certification and the Environmental Test
  • by John Yozallinas, CFSE
  • Tuesday, August 18, 2015
  • Certification

Certification and the Environmental Test

Functional Safety Assessments (FSA) focus on the relevant functional safety standards that are to be applied to a product in the appropriate industry.  These are standards such as IEC 61511 in the process automation industry, or ISO 26262 in the automotive industry.  And IEC 61508 is like an umbrella…

Read More...

  • by Ted Stewart, CFSP, exidaCSP
  • Friday, January 30, 2015
  • Certification

CFSE/CFSP: Why and How to Become One

 

As an engineer responsible for critical industrial processes, we face a variety of challenges:

  • coping with new and changing standards
  • increased pressures for process uptime and plant safety
  • a growing list of responsibilities
  • decreased availability of support personnel

This makes…

Read More...

Do you know your Site Safety Index?
  • by John Yozallinas, CFSE
  • Thursday, August 02, 2018
  • Certification

Do you know your Site Safety Index?

There’s a lot that exida does behind the scenes to advance the industry and benefit you. We try to make sense of data that we collect and put it to good use. One thing we found is that human activities play a role in functional safety, often causing the intended safety performance…

Read More...

Do You Measure the Performance of Your SIS?

Do You Measure the Performance of Your SIS?

It always amazes me that when teaching our FSE 100 Functional Safety Engineering course, the number of times I find that end users in the class are not really measuring the performance of their SIS. In most cases, they are doing some measurements, but not thoroughly.

It…

Read More...

Does Everyone Really Ignore Failure Rates?

Does Everyone Really Ignore Failure Rates?

While discussing functional safety certification of an integrated valve assembly with a manufacturer, exida stated that all devices (actuator, pneumatic parts, valve, etc.) must be IEC 61508 certified. The manufacturer said this was no problem, and provided a set of exida and TÜV certificates. 

Of…

Read More...

Duty of Care (Too Good to Be True Failure Rate Data)

Duty of Care (Too Good to Be True Failure Rate Data)

I have received several calls lately to our Australia / New Zealand office about whether it is acceptable to use published failure rates that seem too good to be true.

The person calling is usually doing a SIL verification calculation for an operating plant or for an…

Read More...

Fake Fact: Final Elements should not be included in SIF evaluation

Fake Fact: Final Elements should not be included in SIF evaluation

Ehh… If your safety action is stopping flow/closing a valve, how are you going to accomplish this if you consider that the remote actuated valve is not part of your SIF ?

So, what is this myth based on? The title of IEC 61508 reads “Functional safety of electrical/electronic/programmable…

Read More...

Fake Fact: IEC 61508 Does Not Affect Me As an End User

Fake Fact: IEC 61508 Does Not Affect Me As an End User

Though this is largely true, I want to discourage people from completely ignoring the good things that IEC 61508 does for the end user.

IEC 61511 is the process industry functional safety standard derived from IEC 61508. In the very first section of IEC 61511 (“Scope”), the standard describes…

Read More...

Functional Safety Assessment of Valve Assemblies  (Part 1)

Functional Safety Assessment of Valve Assemblies (Part 1)

In this blog series, I will cover the emerging trends in the valve assembly market, how these trends relate to the IEC 61511 requirements, and what's in a final element. When you look at the different devices that go into some of these safety systems, the final element becomes…

Read More...

Functional Safety Assessment of Valve Assemblies (Part 2)

Functional Safety Assessment of Valve Assemblies (Part 2)

In Part 1, I covered the emerging trends in the valve assembly market, how these trends relate to IEC 61511 requirements, and the anatomy of final elements.

Now let’s discuss why we need to show requirements traceability down through the design of the safety instrumented function and then…

Read More...

Functional Safety Assessment of Valve Assemblies (Part 3)

Functional Safety Assessment of Valve Assemblies (Part 3)

In Part 1, we covered the emerging trends in the valve assembly market, how these trends relate to IEC 61511 requirements, and the anatomy of final elements. In Part 2, we discussed the need to show requirements traceability down through the design of the safety instrumented function…

Read More...

Functional Safety Standards - IEC 61508 vs. IEC 61511

Functional Safety Standards - IEC 61508 vs. IEC 61511

IEC 61508 is considered a basic or “umbrella” standard for functional safety.  It is generic and sometimes even vague.  IEC 61508 was intended that various industry sectors provide their own specific standards and guidelines as needed.  Here we can see the relationship between 61508 and other standards, such as…

Read More...

Functional Safety, Cybersecurity, and Alarm Management in 2013
  • by Dr. William Goble, CFSE
  • Friday, January 10, 2014
  • Certification

Functional Safety, Cybersecurity, and Alarm Management in 2013

2013 was a good year for functional safety progress.  exida Certification issued a record number of new product functional safety certifications in mostly every product category - valves, actuators, solenoid valves, PLCs, fire and gas sensors, process sensors, and components.  The component category is one of the most…

Read More...

Getting Realistic Failure Rate Data - Part 1

Over the course of several blogs , I will talk about getting realistic failure rate data, where this failure data comes from, and how different methods of failure data analysis compare. I think if you understand this, you will begin to get a very good feel of what it…

Read More...

Getting Realistic Failure Rate Data - Part 4

Over the course of several blogs , I will talk about getting realistic failure rate data, where this failure data comes from, and how different methods of failure data analysis compare. I think if you understand this, you will begin to get a very good feel of what it…

Read More...

  • by Dr. William Goble, CFSE
  • Tuesday, August 04, 2015
  • Certification

Getting Realistic Failure Rate Data - Part 6

Over the course of several blogs , I talked about getting realistic failure rate data, where this failure data comes from, and how different methods of failure data analysis compare. I think if you understand this, you will begin to get a very good feel of what it takes…

Read More...

How do You Compare?

Industry Benchmark Survey on Alarms as Safeguards and Independent Protection Layers (IPLs)

exida recently conducted an industry benchmark survey on the practices for the use of alarms as safeguards and IPLs. With over 200 safety practitioners from around the world providing responses, you can use the survey findings to…

Read More...

How Good Is Your Functional Safety Management?

How Good Is Your Functional Safety Management?

I Failed the CFSE Exam, HELP!
  • by Dr. William Goble, CFSE
  • Thursday, February 27, 2020
  • Certification

I Failed the CFSE Exam, HELP!

It is tough to receive an email with this message from a prospective CFSE candidate.  I know that when I have failed exams, I want to understand what was wrong so I can study those areas of knowledge more deeply and try again. Given the recognition and prestige…

Read More...

Is It Possible to Extend Proof Test Intervals?

Is It Possible to Extend Proof Test Intervals?

I am often asked whether extending proof test intervals will be a problem. 

This is a tricky question. The design and engineering SIL calculations for the Safety Instrumented Functions (SIFs) are taking credit for a specific proof test interval with a defined level of coverage, as defined within the…

Read More...