Re: [foxboro] Safety systems
- From: Neil Martin <neil_martin@xxxxxxxxxxxx>
- To: foxboro@xxxxxxxxxxxxx
- Date: Wed, 22 Mar 2006 12:22:12 -0600
It all depends on the SIL requirements, Boiler Code, desired full function
test frequency, and desired low spurious trip rate. We have SIL2
requirements, and desire a minimum 2 year test frequency, thus the
expection is that we will install a TMR system on a project we are
currently looking at. If you want low spurious trip rates, the hardware
cost difference after providing available redundancy is not really very
much. If you use a PLC and implement per the safety manual, I believe you
will find that it will require you to do a lot more than what would be
required for a TMR, and it will have a higher spurious trip rate. The
Allen Bradley safety manual for using a Control Logix PLC mentions a SIL2
compatibility at a 1 year test frequency. Most likely, the PLC will not
have the capability for the same level of redundancy as can be provided by
TMR system.
Neil Martin, P.E.
Huntsman Polymers Corporation
2505 South Grandview
Odessa, TX. 79766
ph) 432-640-8436
pager)432-742-4289
email page)4327424289@xxxxxxxxxxxxx
<duc.do@dowcornin
g.com> To:
<foxboro@xxxxxxxxxxxxx>
Sent by: cc:
foxboro-bounce@fr Subject: [foxboro] Safety
systems
eelists.org
03/22/2006 10:15
AM
Please respond to
foxboro
Hi list,
A question came up about what people commonly use for their safety
systems such as BMS (burner management system) on boilers and other
critical and perhaps dangerous things. For those of you who use such
things, do you use PLC-type equipment or more robust stuff like Triconex
or August systems?
Since this is a fairly generic question that probably engender generic
answers, please send your answers directly to me, off-list. Thank you!
Duc
--=20
DCS Group, Carrollton Plant
Dow Corning Corporation
Carrollton, KY, US
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