Re: [foxboro] Locking / Disabling equipment

You cannot rely on the DCS to lockout devices. You must control the =
source of energy, whether that is electrical, pressure, hydraulic or =
other. In fact, you can't comply with OSHA requirements unless you use =
lockout/tagout on the energy source, not just the controller of the =
device.

> -----Original Message-----
> From: brad.s.wilson@xxxxxxxxxxxxxx=20
> [mailto:brad.s.wilson@xxxxxxxxxxxxxx]
> Sent: Wednesday, August 24, 2005 2:12 PM
> To: foxboro@xxxxxxxxxxxxx
> Subject: [foxboro] Locking / Disabling equipment
>=20
>=20
> We're wrestling with the best way to lockout equipment=20
> operated by the DCS.
> Our policy states that the technician doing the work must=20
> ultimately be in
> sole control of the locking "device".  The obvious (and=20
> advertised) method
> to prevent operation of a DCS-controlled device is via the=20
> block DISABLE
> parameter.  However, anyone with access to SELECT (or any=20
> other way to get
> block default display) also has access to the DISABLE=20
> parameter.  Our past
> practice has been to physically lock a motor starter,=20
> disconnect a valve
> air supply, remove a valve acruator, etc, rather than rely on=20
> the DCS for a
> secure lockout.
>=20
> I'd like to know how other users manage lock/tag/try for=20
> DCS-controlled
> equipment.
>=20
> Brad Wilson
> ExxonMobil Chemical Co
> Edison Synthetics Plant
> 732-321-6115
> 732-321-6177 fax
> Brad.S.Wilson@xxxxxxxxxxxxxx
>=20
> =20
> =20
> ______________________________________________________________
> _________
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> Invensys Process
> Systems (formerly The Foxboro Company). Use the info you=20
> obtain here at
> your own risks. Read=20
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> =20
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>=20
 
 
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