Machinery Safety 101

ISO 13849 – 1 Analysis — Part 4: MTTFD – Mean Time to Dangerous Failure

This entry is part 4 of 9 in the series How to do a 13849 – 1 ana­lys­is

Post updated 2019-07-24. Ed. Func­tion­al safety is all about the like­li­hood of a safety sys­tem fail­ing to oper­ate when you need it. Under­stand­ing Mean Time to Dan­ger­ous Fail­ure, or MTTFD, is crit­ic­al. If you have been read­ing about this top­ic at all, you may notice that I am abbre­vi­at­ing Mean Time to Dan­ger­ous Fail­ure with all cap­it­al…

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ISO 13849 – 1 Analysis — Part 3: Architectural Category Selection

This entry is part 3 of 9 in the series How to do a 13849 – 1 ana­lys­is

Post updated 2019-07-24. Ed. At this point, you have com­pleted the risk assess­ment, assigned required Per­form­ance Levels to each safety func­tion, and developed the Safety Require­ment Spe­cific­a­tion for each safety func­tion. Next, you need to con­sider three aspects of the sys­tem design: Archi­tec­tur­al Cat­egory, Chan­nel Mean Time to Dan­ger­ous Fail­ure (MTTFD), and Dia­gnost­ic Cov­er­age (DCavg). In…

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ISO 13849 – 1 Analysis — Part 2: Safety Requirement Specification

This entry is part 2 of 9 in the series How to do a 13849 – 1 ana­lys­is

This art­icle was updated 2019-07-24. Ed. Devel­op­ing the Safety Require­ment Spe­cific­a­tion The Safety Require­ment Spe­cific­a­tion sounds pretty heavy, but actu­ally, it is just a big name for a way to organ­ize the inform­a­tion you need to have to ana­lyze and design the safety sys­tems for your machinery. Note that I am assum­ing that you are doing this in…

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Brexit Update – CE Marking and the UK

Brexit: UK and EU Flags against a blue sky

I recently read a press release by UKAS, the UK’s accred­it­a­tion body, regard­ing their ongo­ing dis­cus­sions with the UK gov­ern­ment regard­ing the impact that BREXIT could have on UK accred­it­a­tion. As men­tioned by Douglas Florence in a recent dis­cus­sion on Linked­In, it’s pos­sible that if not handled well things could end up in a bit of a mess. Mr…

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ISO 13849 – 1 Analysis — Part 1: Start with Risk Assessment

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

This post was updated 2019-07-24 I often get ques­tions from cli­ents about how to get star­ted on Func­tion­al Safety using ISO 13849. This art­icle is the first in a series that will walk you through the basics of using ISO 13849. Keep in mind that you will need to hold a copy of the 3rd edi­tion of ISO 13849 – 1 [1]…

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The Brexit Vote and CE Marking: What’s it going to mean for Canadian Exporters?

Shocked and Amazed by Brexit This morn­ing I am shocked and amazed to learn that one of the founders of the European Uni­on has chosen to leave that Uni­on. Join­ing the EEC in 1973, the UK and oth­er European coun­tries moved toward the form­a­tion of the EU, first as an eco­nom­ic treaty, and even­tu­ally as a polit­ic­al…

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Testing Emergency Stop Systems

This entry is part 11 of 16 in the series Emer­gency Stop

I’ve had a num­ber of ques­tions from read­ers regard­ing test­ing of emer­gency stop sys­tems, and par­tic­u­larly with the fre­quency of test­ing. I addressed the types of tests that might be needed in anoth­er art­icle cov­er­ing Check­ing Emer­gency Stop Sys­tems. This art­icle will focus on the fre­quency of test­ing rather than the types of tests. The Prob­lem Emer­gency…

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Risk Assessment Blunders

Updated 7‑Jul-2014 Recently I read a blog post writ­ten by Dav­id Cant, called, “Are You Mak­ing These Risk Assess­ment Blun­ders?”. Writ­ing in the UK, Mr. Cant spoke to some of the com­mon kinds of prob­lems that can occur when employ­ers con­duct risk assess­ments. Many his points are equally applic­able to machine build­ing: No Risk Assess­ment – This seems self…

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Interpreting the EU MACHINERY DIRECTIVE 2006/42/EC: An Interview with Ian Fraser

This art­icle was ori­gin­ally pub­lished on CEMarking.net. Check out the inter­view that Han Zuy­derwijk of CEMarking.net and I did with Ian Fraser, former Policy Officer at the European Com­mis­sion respons­ible for the Machinery Dir­ect­ive (2006/42/EC), and Team Lead­er about ques­tions related to the Machinery Dir­ect­ive (2006/42/EC). Dur­ing the inter­view, we dis­cuss: the reg­u­lat­ory devel­op­ments in the dir­ect­ive…

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Q & A SESSION ON THE MACHINERY DIRECTIVE WITH IAN FRASER

The Guide to the Machinery Dir­ect­ive: Ian Fraser Han Zuy­derwijk from CEMarking.net and Doug Nix inter­view Ian Fraser about the second edi­tion of the Guide to the Machinery Dir­ect­ive. CE Mark­ing is hard enough, and the rules change fre­quently. Give Google a rest. We have him: the man who wrote the Machinery Dir­ect­ive. If he can’t…

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