Re: [foxboro] Locking / Disabling equipment
- From: stan <stanb@xxxxxxxxx>
- To: brad.s.wilson@xxxxxxxxxxxxxx
- Date: Sat, 3 Sep 2005 13:27:45 -0400
On Wed, Aug 24, 2005 at 02:11:52PM -0400, brad.s.wilson@xxxxxxxxxxxxxx wrote:
> We're wrestling with the best way to lockout equipment operated by the DCS.
> Our policy states that the technician doing the work must ultimately be in
> sole control of the locking "device". The obvious (and advertised) method
> to prevent operation of a DCS-controlled device is via the block DISABLE
> parameter. However, anyone with access to SELECT (or any other way to get
> block default display) also has access to the DISABLE parameter. Our past
> practice has been to physically lock a motor starter, disconnect a valve
> air supply, remove a valve acruator, etc, rather than rely on the DCS for a
> secure lockout.
>
> I'd like to know how other users manage lock/tag/try for DCS-controlled
> equipment.
>
I think you will find that removing all potential sources of energy
from the system to be worked on is the only industry wide acepted
practice for this.
--
U.S. Encouraged by Vietnam Vote - Officials Cite 83% Turnout Despite Vietcong
Terror
- New York Times 9/3/1967
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