Document 71JqLLwN3bKnweJD3k9k33QKR

.' CHECKLIST (ATTACHMENT 1) Record Number 460541 NOTIFICATION OF PROCESS CHANGE CHECKLIST TypeChunge Major Q Moderute 0 MinorQ Originator:................... GaryJRiZZODate of Origination:..............................,7/10/9.6............................. Proposed Date of Change .4/.1JUS6...... Area: ...................JVLQD..Y.................... Followup Requited: i~l Yes H No I Permanent Temporary......... From ................. To ................ Temp MOCReuirned to Original Semis O Yes No 1 Description and Location of Changeg^J^ -- Technical Basis for Change: .WibMinL.t!^^ " ____a! _ Impact on: Type of Change: Safety Alarm Instrument Shutdown Point X Process Computer Control .Cppjs pffjp m Loss Prevention Addition or Removal of Equipment Equipment/Material Modification Piping Modification Environment Job Procedure Chemical Other ---- Li Health Pre-Modification Checklist: Applicable N/A ...X.. Initials Consult piping and equipment specifications. ...X.. Perform Reactive Chemicals testing. 7/10/96In-Progress? ...X.. Add materials involved to Toxic Substance Control Act (TSCA) inventory. ...X.. Calculate impact on F&EI and CE1 Comply with Engineering Practices. Comply with Technology Center guidelines. ..X.. Comply with Dow LAD Environmental Project Checklist. ..X.. Comply with Safety and Loss Prevention requirements. Consult maintenance. (Name) ........................................................................ ,,x,, Consult instrument and electrical technician. (Name).......................................................................................................... ...X.. Consult parts technician.(Name)..................................................................... ..x,, Evaluate and modify relief system.(Name) .................................................. ..X.. Contact Industrial Hygiene.(Name)................................................................ Contact Process Engineering. (Name)........................................................... Complete required reviews. (Name diem)...................................................... ..X... ...X.. Consult Computer programming support (Name) ................................................. Consult Operations (Name ) ............................................................................... Contact Environmental (Name )................................................................................ Champs work order (List) ..................................................................................... Review Training Needs With Operations Supervisors or Technologist (Name) Consult With Quality Person to determine if product MOC Required (Name) ,, Other .............................................................................................................. Approvals: J- Signature Dale Originator First Reviewer Post-ModififcafKtn Checklist: (Before startup) NtT^^Init \... Perform pre-startup audit. X................ Instrument loop drawings X.. Complete or update training program. ...X................ Electrical drawings. X.. Job procedures written and approved. X... P&ID's, process flow sheets and plot plans updated. _______ ,.x.. M. Personnel trained on the change. Training Documentation Attached fr I Yes X.. ,,x,, Critical instrument checklist updated. MOD check sheet completed, computer code and documentation changed. DO A 025637 X.. Complete and Update Plant Files and equipment files CONFIDENTIAL Final Reviewer ,/hlu* Form No. 470-00162-t p System C-1500 Equipment Number 100 Can AO(121) - C-1500 Steam Control Valve. Old Control Upon enabling, AO(121) goes to a fixed flow rate AK(830) until a minimum temperature based on AC(47) is reached. When the minimum temperature is reached control switches to Steam/Feed ratio control, (see DC(803),DC(805)) New Control The initial control is the same however when the minimum temperature is reached, control will now switch to bottoms temperature control and will remain in this control mode until the reactor is started up. Once the reactor has been started up, indicated by DC(2763) becoming TRUE, the control will switch to steam/feed ratio control. (See DC(143)) AO(131) - C-1500 Freon Control Valve Old Control When the system is first started up it is on level control. When the operator sets DK(74) true it switches to temperature control of tray 43 at AK(162) setpoint New Control Anytime the reactor is down DK(74) autozero's placing AO(131) in the level control mode, controlling Al(104) at AK(804) setpoint. Other Additions \ Failure Logic for the following have been written and added to alarm (116) Al(161) - DC(761) Al(162) - DC(195) AI(172) - DC(1588) Al(182) - DC(1579) D0 A 025638 CONFIDENTIAL D System C-1500 Equipment Number 100 Can Over Head Temperature Transmitter Logic Has Been Added. AC(777) has been added to the overhead temperature control selection, allowing the operator to choose which overhead temperature transmitter they want to control. Also in the event that the default temperature, Al(162) fails, indicated by DC(195) becoming true, control will automatically switch to Al(172) and control at the temperature was running at the time of the swap. The operator also has the option of choosing any of the 3 temperatures for control by setting AK(847) equal to the transmitter. In the event that the transmitter chosen fails, the AK will be autozered on control will default back to Al(162). Swapping From Bottoms Temp Control To Steam / Feed Control When swapping from bottoms temperature control to steam/feed ratio control, if there is a difference between the actual ratio, AC(16) and the ratio setpoint AK(125) by an amount set by AP(790), DC(790) will become true, holding the ratio setpoint at its current value. DC(790) will remain true until the operator makes AK(125) equal to AC(16). When DC(790) becomes true, ALM(109) will activate, indicating that there is a setpoint problem. When swapping from Steam/Feed ratio control to bottoms temperature control, the same situation occurs if the bottoms temperature differs to much from the actual setpoint. The current temperature latches in as the setpoint and remains as the setpoint until the board operator makes AK(161) equal to AC(1496). (SEE DC(1589), AC(1496)). Contingencies 1. If, while on bottoms temperature control, Al(161) should fail, indicated by DC(195), control will switch to steam/feed ratio control. 2. If, while on steam/feed ratio control, a large feed reduction is indicated, control will switch to bottoms temperature control and the ov'hd will switch to level control. (See DC(1201),DC(143)) 3. If all three ov'hd temperatures fail, the last good position will be held. Ch^ORlNA TED Mh / HANES NON COMMUNIQUE TRAINING RECORDS .y... Facilitator Training Area _tXl.iz2*ain*...CrizQM__ ___________________________ 7-__ Month Year :fer............... Description Staff Super SOS's Name Jj. Master # Classif. /JZ < 37 Ct -f3/til J7~ J .P3U3T/. C-lfttUV<Lt. Uet&*- ^4fTJ 7jj6fotB4? Mr-tfJrUK 7)ajnr(jr^ ^flL- ) V . _ H.U. vX7. ziias1) ^7?-5 , 2JU> 2&>-, Loaders Day Oper. Date 7 0 - 2JL& 7- ^ -v'c7-6 i?6- - 7-^ >- J&10C 7-/1-7C 2-JS-Il y=i,\25f^ Signature /Zi+AJ*&r~> \ DO A 025640 CONFIDENTIAL