Machinery Safety 101

ISO 13849 – 1 Analysis — Part 8: Fault Exclusion

This entry is part 9 of 9 in the series How to do a 13849 – 1 ana­lys­is

Post updated 2019-07-24. Ed. Fault Con­sid­er­a­tion & Fault Exclu­sion ISO 13849 – 1, Chapter 7 [1, 7] dis­cusses the need for fault con­sid­er­a­tion and fault exclu­sion. Fault con­sid­er­a­tion is the pro­cess of examin­ing the com­pon­ents and sub-sys­tems used in the safety-related part of the con­trol sys­tem (SRP/CS) and mak­ing a list of all the faults that could occur in each…

How Risk Assessment Fails — Again. This time at DuPont.

Casualty Evacuated by EMS
This entry is part 6 of 9 in the series Risk Assess­ment

A recent report released by the US Chem­ic­al Safety Board (CSB) looks at a series of acci­dents that occurred over a 33-hour peri­od on Janu­ary 22 and 23, 2010 at the DuPont Corporation’s Belle, West Vir­gin­ia, chem­ic­al man­u­fac­tur­ing plant. Copy­right secured by Digi­prove © 2011 – 2014Acknow­ledge­ments: US Chem­ic­al Safety Board for excerpts more…Some Rights ReservedOri­gin­al con­tent here is pub­lished under these license terms: X License Type:Non-com­mer­cial, Attri­bu­tion,…

The purpose of risk assessment

This entry is part 3 of 9 in the series Risk Assess­ment

I’m often asked what seems like a pretty simple ques­tion: “Why do we need to do a risk assess­ment?” There are a lot of good reas­ons to do risk assess­ments, but ulti­mately, the pur­pose of risk assess­ment is best summed up in this quo­ta­tion: “Risk assess­ments, except in the simplest of cir­cum­stances, are not designed for mak­ing judge­ments,…

How Risk Assessment Fails

Fukushima Dai Ichi Nuclear plant before the meltdown
This entry is part 2 of 9 in the series Risk Assess­ment

The events unfold­ing at Japan’s Fukushi­ma Dai Ichi Nuc­le­ar Power plant are a case study in ways that the risk assess­ment pro­cess can fail or be abused. In an art­icle pub­lished on Bloomberg.com, Jason Clen­field item­izes dec­ades of fraud and fail­ures in engin­eer­ing and admin­is­tra­tion that have led to the cata­stroph­ic fail­ure of four of six…

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CSA Z1002 Public Review – Only 15 days left!

Only 15 days remain to get your thoughts sub­mit­ted on the draft of CSA Z1002. Do it now!

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Reader Question: Multiple E‑Stops and Resets

This entry is part 7 of 16 in the series Emer­gency Stop

I had an inter­est­ing ques­tion come in from a read­er today that is rel­ev­ant to many situ­ations: “When you have mul­tiple E‑Stop but­tons I have often got­ten into an argu­ment that says you can have a reset beside each one. I was taught that you were required to have a single point of reset. Who is cor­rect?” — Michael Barb,…

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Understanding Risk Assessment

A group surrounding a computer discussing a problem.
This entry is part 10 of 9 in the series Risk Assess­ment

When people dis­cuss ‘Risk’ there are a lot of dif­fer­ent assump­tions made about what that means. For me, the study of risk and risk assess­ment tech­niques star­ted in 1995. As a tech­no­lo­gist and con­trols design­er, I had to some­how wrap my head around the whole concept in ways I’d nev­er con­sidered. If you’re try­ing to fig­ure out risk…

CSA Z1002 Risk Assessment Standard – 60 Day Public Review

Get more inform­a­tion on CSA Z1002. The draft of this doc­u­ment is now avail­able for pub­lic review through CSA.

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