We do the physical things you mentioned as part of a "clearance". I am = using the word clearance, as lockout can be a part of a clearance. In = addition to the physical measures we "hang" on the DCS display. This = means we ask a visual block be placed over the Motor start controls (ie. = a pump start stop) display. This red block has an input to reference a = clearance number. We have rules that insure the motor is in a safe = condition prior to being able to place the red box over the start stop = control on screens. We make the start stop buttons non accessible. Bryan Wiggins=20 Xcel Energy -----Original Message----- From: foxboro-bounce@xxxxxxxxxxxxx [mailto:foxboro-bounce@xxxxxxxxxxxxx]On Behalf Of brad.s.wilson@xxxxxxxxxxxxxx Sent: Wednesday, August 24, 2005 12:12 PM To: foxboro@xxxxxxxxxxxxx Subject: [foxboro] Locking / Disabling equipment 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. Brad Wilson ExxonMobil Chemical Co Edison Synthetics Plant 732-321-6115 732-321-6177 fax Brad.S.Wilson@xxxxxxxxxxxxxx =20 =20 _______________________________________________________________________ This mailing list is neither sponsored nor endorsed by Invensys Process Systems (formerly The Foxboro Company). Use the info you obtain here at your own risks. Read http://www.thecassandraproject.org/disclaimer.html =20 foxboro mailing list: http://www.freelists.org/list/foxboro to subscribe: = mailto:foxboro-request@xxxxxxxxxxxxx?subject=3Djoin to unsubscribe: = mailto:foxboro-request@xxxxxxxxxxxxx?subject=3Dleave =20 _______________________________________________________________________ This mailing list is neither sponsored nor endorsed by Invensys Process Systems (formerly The Foxboro Company). Use the info you obtain here at your own risks. Read http://www.thecassandraproject.org/disclaimer.html foxboro mailing list: http://www.freelists.org/list/foxboro to subscribe: mailto:foxboro-request@xxxxxxxxxxxxx?subject=join to unsubscribe: mailto:foxboro-request@xxxxxxxxxxxxx?subject=leave