Re: [SystemSafety] SIL ratings to be scrapped?

From: René Senden < >
Date: Wed, 21 Aug 2013 16:45:50 +0200

Hi Chris,  

I am afraid I am not 100% sure as to what it is you are asking.. Apparently an industrial control systems will be developed, and someone involved in this

undertaking reports that the usual SIL-based safety-standard will not be used for this particular project. Instead, and I quote, “it will be replaced

by ALARP”…  

Now regarding your query… There are already various safety-standards which do not apply the SIL-concept, but I am sure you are aware of these… So… I assume

you are interested to find out whether there is any safety-standard for which the most recent version (still) applies the SIL-concept (or something similar), and for

which the next update is known to involve “scrapping” the SIL-concept.  

I am not aware of any such development myself but I would be most interested in the answer to this question. May I ask which standard was used up to now for

the type of industrial control system you refer to?  

Best regards,


From: systemsafety-bounces_at_xxxxxx [mailto:systemsafety-bounces_at_xxxxxx Chris Hills
Sent: woensdag 21 augustus 2013 16:26
To: 'Bielefield Safety List'
Subject: [SystemSafety] SIL ratings to be scrapped?  

Hi all,  

I have just been taking to one of my customers who do control systems for industrial systems. They have been told by someone they are doing a system for that SIL ratings will “soon be scrapped”. Apparently “It will be replaced by ALARP”. This seems like a completely misunderstood half a message. Though usually on this sort of thing there is a grain of reality (if miss reported or miss represented) in there somewhere.  

I know I have not been paying attention over the summer but I haven’t seen anything. Is there a move on any standard to change from SIL ratings for projects?    



Eur Ing Chris Hills BSc CEng MIET MBCS FRGS FRSA Technical Specialist Phaedrus Systems Ltd Tel: FREEphone 0808 1800 358 Vat GB860621831 Co Reg #04120771
Http:// <> chills_at_xxxxxx    

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systemsafety_at_xxxxxx Received on Wed Aug 21 2013 - 16:46:04 CEST

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