[SystemSafety] SIL ratings to be scrapped?

[Inge, James Mr]

It is possible that this rumour might relate to the current work
underway to revise Def Stan 00-55, Requirements for Safety Related
Software in Defence Systems.

 

A system of SILs was defined Def Stan 00-56 Issue 2, Safety Management
Requirements for Defence Systems (1996), which was also used in Def Stan
00-55.  However, SILs were removed from the mandatory part of 00-56 in
Issue 3 (2004) as part of the move to a goal-based approach to
requirements setting.  Instead, the guidance in 00-56 Part 2 discussed
setting integrity requirements in generic terms, rather than using a
specific SIL scheme.  However, the guidance made it clear (in Annex C,
section C.2) that SIL schemes could still be used where they were
suitable.  

 

Def Stan 00-55 was made obsolescent by the release of 00-56 Issue 3, and
has not been re-issued.  However, new work is currently underway to
revise both standards.  I have not seen recent drafts, but it is likely
that neither standard will define a system of SILs, or require use of a
specific SIL scheme.  That said, it is also likely that use of suitable
standard that incorporates SILs or a similar concept could still be part
of the argument to demonstrate compliance with either 00-55 or 00-56.

 

Regards,

 

          James Inge

 

 

________________________________

From: systemsafety-bounces at lists.techfak.uni-bielefeld.de
[mailto:systemsafety-bounces at lists.techfak.uni-bielefeld.de] On Behalf
Of Dominey, Alan (UK)
Sent: 21 August 2013 16:59
To: safetyyork at phaedsys.com; 'Bielefield SafetyList'
Subject: Re: [SystemSafety] SIL ratings to be scrapped?

 

I think there may have been a misunderstanding somewhere along the way
here.

 

UK MoD implemented the use of SILs into many of their projects a few
years ago and these are now being replaced by

SIRs  -  Safety Integrity Requirements  ( High / Medium / Low) . . .
Don't know if this is a pointer in any direction . . .

 

        Many Thanks 

        Regards

        Alan

        Alan G. Dominey

        Electrical Safety Engineer 

        Torpedo Capability Contract Project Surveillance Manager

        Spearfish Safety Group

*      BAE Systems,  Maritime Services

Building 31, Broad Oak Business Park,

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From: systemsafety-bounces at lists.techfak.uni-bielefeld.de
[mailto:systemsafety-bounces at lists.techfak.uni-bielefeld.de] On Behalf
Of Chris Hills 
Sent: 21 August 2013 15:26
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? 

 

 

Regards 

     Chris 

    

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://www.phaedsys.com <http://www.phaedsys.com/>  chills at phaedsys.com 

 

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