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m DEMO off 2H HOT OIL RETURN LINE TO EM70 'Revm^v^l of "V- 410 For Re pairs PROCEDURE Ot-07-lHJ hart Sfl FETY Step AcUm 1 JOB MUST BE WALKED OUT & UNDERSTOOD BY EVERYONE BEFORE THE PERMTT IS ISSUED 2 ALL LINE OPENINGS MUST BE IDENTIFIED, WITH LINE OPENING SUCKERS, PIPE PAINTED PURPLE 3 MONOGOGGLES ARE REQUIRED FOR LINE OPENINGS 4 SAFETY HARNESS MUST BE USED FOR WORKING ABOVE GROUND LEVELS 5 EACH PERSON ON THE JOB MUST HAVE NORMAL BLOCK SAFETY EQUIPMENT ON HIS PERSON 4 MUST HAVE THE APPROVAL OF THE SAFETY OBSERVER TO START HOT WORK 7 IF A SLIP BUND OR BULL BLIND IS INSTALLED OR REMOVED, IT MUST BE UPDATED ON BUND LIST FOR THE JOB 9 FOLLOW SAFETY REFERANCE A-6 FOR PIPE STOPPER 9 OIL PADS SHOULD BE ON HAND WHEN SUP BUNDING EQUIPMENT FOR HOT WORK 19 SPECIAL PRECAUTIONS WHEN DEALING WTIH SYSTEM 1#A HOT OIL WHEN EMPTING SYSTEM ADAM MlCHtLPhe* Author* nacM A 00 A 019130 OONFIDFNTIAI DEMO of 2" HOT OIL RETURN LINE TO D-470 MB PIPE STOPPER PROCEDURENEEDS TO BE FOLLOWED S.&LP. A-6 WIIH CHECK SHEET FILLED OUT MC OIL SHEEN IF LINES ARE NOT TAKEN DOWN PROPERLY MD A DOUBLE BLOCK A BLEED WILL BE USED FOR ISOLATION ON R-250 A / B RETURN OIL LINES ( SEE DRAWING ) 15 'Peurntr ;s KQump Rem e>v/n-t I* 'DcuSELL U)!LL a/ 0-470, v-t?a EXPLANATIONS OF EACH STEP 00 a 019131 00NFT0FNTTA1, OPEN PLAN ACTLINE PROJECT: PROJ146I Aclj .Y DESCRIPTION EQUIP <LINE LINE-DESCRIPTION DOW CHEMICAL LAD ACTIVITY LINE ITEM LISTING by ACTIVITY NUMBER Filter: EQUIP = 'D-470 ' METHANES SHUTDOWN 1461 PAGE: 1 REPORT DATE:28MAY93 TIME NOU:15-AUG-07:OQ ENGR AREA DUR CAL MANJKXJRS TYPE WORK CREW CHAMPS MAN-HRS C.E.CODE QUANTITY MHrs/EACH > SDD470-A1 BUILD SCAFFOLD TO ISOLATE H/O LINE D-470 SD TRICE 8 16 HOT OIL .0 PREWORK SCAFF I < 1 SCAFFOLD AT E-52 RETURN LINE < 2 SCAFFOLD AT 3" PUMP RECIRC. LINE < 3 SCAFFOLD AT COLD CUT & WELD .0 .0 .0 0 0 0 SDD470-B1 REMOVE INSULATION TO SLIP BLIND H/O LINE 8 16 D-470 SD TRICE HOT OIL 6.0 PREWORK INSUL I < 1 REMOVE INSULATION TO INSTALL 2" S/B < 2 REMOVE INSULATION TO INSTALL 3" S/B < 3 REMOVE INSULATION TO INSTALL 8" S/B < 4 REMOVE INSULATION TO CUT & WELD LINE < 5 REMOVE INSULATION TO INSTALL 8" S/B 1.0 1.0 2.0 1.0 1.0 N 0 0 0 0 0 CLEAR D-470 & BAD TRACING LINES D-470 SD TRICE < 1 SEE CLEAR PROCEDURE < 2 COOL DOWN OIL IN D-470 < 3 EMPTY D-470 TO T-252 < 4 LOW POINT D-470 TO T-252 16 5 .0 OP HOT OIL PREWORK I .0 .0 .0 .0 0 0 0 0 0 SDD470-C2 DYE CHECK PAD EYES ON D-470 D-470 4 21 HOT OIL < 1 DYE CHECK PAD EYES ON D-470 .0 MTS 0 MTS 0 SDD470-D1 S/B D-470 HOT OIL RETURN LINE D-470 SD TRICE HOT OIL < 1 SLIP BLIND E-52 RETURN D-470 SIDE < 2 SLIP BLIND P-470 RECIRC. D-470 SIDE < 3 SLIP BLIND BYPASS R-250A RETURN D-470 SIDE < 4 SLIP BLIND BYPASS R-250B RETURN D-470 SIDE 7.7 PF I 1.5 .0 3.1 3.1 PF 0 0 0 0 > . .> .> .> .> ,> > ,> > > > > > > A00 comp TFNTToi. OPEN PLAN ACTLINE PROJECT: PROJ146I acI ! <r DESCRIPTION <LINE EQUIP LINE-DESCRIPTION DOW CHEMICAL LAO ACTIVITY LINE ITEM LISTING by ACTIVITY NUMBER Filter: EQUIP `D-470 1 METHANES SHUTDOWN 1461 PAGE: 2 REPORT DATE-.Z8MAY93 TIME NOW:15-AUG-07:Q0 ENGR AREA DUR CAL MAN_HOURS TYPE WORK CREW CHAMPS MAN-HRS C.E.CODE QUANTITY MHrs/EACH > SDD470-E1 PREPARE TO COLD CUT AND WELD FLG 2" TRACING RETR D-470 SD TRICE HOT OIL 6 5 < 1 DEMO 4' 2" HOT OIL RETURN LINE < 2 CLEAR RESIDUE OIL BEFORE INSTALLING SEWER PLUG < 3 INSTALL SEWER PLUG < 4 WELD 2" 300# FLG. < 5 INSTALL 2" 300# VALVE ON NEW FLG. < 6 INSTALL B/B ON VALVE 11.1 PF I 2.0 2.0 1.5 2.1 2.0 1.5 PF 0 0 0 0 0 0 > > > > > > SDD470-F1 REMOVE ALL SLIP BLINDS ON HOT OIL RETURN LINE D-470 SD TRICE HOT OIL 5 5 < 1 REMOVE S/B E-52 RETURN LINE & BUTTON UP < 2 REMOVE S/B P-470 RECIRC. & BUTTON UP < 3 REMOVE S/B BYPASS R-250A & BUTTON UP < 4 REMOVE S/B BYPASS R-250B & BUTTON UP 9.5 PF I 1.5 1.8 3.1 3.1 PF (M O SD. J1 INSULATE D-470 VESSEL D-470 < 1 INSULATE D-470 VESSEL HOT OIL .0 PREWORK INSUL .0 N 0 ,> SDD47Q-J2 CHECK SCAFFOLD ON D-470 D-470 < 1 CHECK SCAFFOLD ON D-470 4 21 HOT OIL .0 PREWORK SCAFF .0 S 0 #> SDD470-K1 REMOVE EXISTING D-470 INSULATION D-470 HOT OIL 8 5 < 1 REMOVE EXISTING D-470 INSULATION .0 INSUL N .0 0 V. > SDD470-L1 REMOVE D-470 INSTR D-470 HOT OIL 6 12.0 t/E I/E 00 A 019133 CONFIDENTIAL OPEN PLAN ACTLINE PROJECT: PR0J146I "VI ACT ............................ ,Y DESCRIPTION EQUIP <LINE LINE-DESCRIPTION DOW CHEMICAL LAD ACTIVITY LINE ITEM LISTING by ACTIVITY NUMBER Filter: EOUIP * 'D-470 METHANES SHUTDOWN 1461 PAGE: 3 REPORT DATE:28MAY93 TIME NOW:15-AUG-Q7:Q0 ENGR AREA DUR CAL MAN_ HOURS TYPE WORK CREW CHAMPS MAN-HRS C.E.COOE QUANTITY MHrs/EACH > < 1 REMOVE PSH-8991 < 2 REMOVE PT-8977 < 3 REMOVE LSHH-8976 < 4 REMOVE LSL-8979 < 5 REMOVE LT-8975 < 6 DISCONNECT GROUND CABLE 2.0 2.0 2.0 2.0 2.0 2.0 0> 0> 0> 0> 0> 0> SDD470-M1 DISCONNECT AND REMOVE D-470 D-470 10 HOT OIL 5 < 1 DISCONNECT NZ LINE TO PSV'S N2-1900 < 2 REMOVE HD-2030 FROM D-470 TO 3-WAY VALVE < 3 B/B BOTTOM OF 3 WAY VALVE & SPOOL < 4 REMOVE VENT TO C/L SPOOL < 5 B/B VENT AND C/L < 6 DISCONNECT HO-2029 3" 300# < 7 DISCONNECT HO-2058 16" 300# < 8 DISCONNECT HO-Z056 6" 300# < 9 DISCONNECT HO-2010 20" 300# < 10 REMOVE LSHH STRONG BACK & VALVES < 11 B/B VALVES ON STRONG BACK < 12 REMOVE VALVES FOR LT-8975 WRAP IN VISQUEEN < "--iiEnagrvHP?nnr-noEELE b i iob" < 14 REMOVE VALVE ON NOZZLE M 2" 300# < 15 REMOVE VALVE ON NOZZLE E 3" 300# < 16 WRAP VALVES IN VISQUEEN < 17 REMOVE ANCHOR BOLTS < 18 REMOVE D-470 < 19 D-470 WEIGHTS 45,600# < 20 TOP OF D-470 TO FACE BACK OF TRUCK 55.6 PF 1.5 3.0 1.5 4.5 1.5 1.7 7.4 2.6 8.8 3.0 3.0 3.4 1.3 1.0 1.4 1.0 1.0 8.0 .0 .0 PF 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 > > > > > > > > > > > > > > > > > > > > SD0470-N1 SET UP TO WASH D-470 D-470 HOT OIL 7 5 < 1 INSTALL 5 EA. 2" B/B 300# < 2 INSTALL 1 EA. 1-1/2" B/B 300# < 3 INSTALL 3 EA. 3" B/B 300# < 4 INSTALL 1 EA. 6" B/B 300# < 5 INSTALL 1 EA. 16" 300# FLG. W/3" FITTING < 6 INSTALL 1 EA. 20" 300# FLG. W/3" FITTING < 7 MOVE TO DECON AREA < 8 INSTALL 3" 300# FLG. W/3" FITTING 42.0 PF 7.5 .5 7.2 2.6 7.4 8.8 8.0 .0 PF 0 0 0 0 0 0 0 0 > > > > > > > > DO A 01.9104 rONFIDFNTIAI. OPEN PLAN ACTL1NE PROJECT: PROJ146I DOU CHEMICAL LAD ACTIVITY LINE ITEM LISTING by ACTIVITY NUMBER Filter: EQUIP = 'D-470 ' METHANES SHUTDOWN 1461 PAGE: 4 REPORT DATE:28MAY93 TIME NOW:15-AUG-07:00 AC? TY DESCRIPTION <LINE EQUIP LINE-DESCRIPTION ENGR AREA DUR CAL MAN_HOURS TYPE WORK CREW CHAMPS MAN-HRS C.E.COOE QUANTITY MHrs/EACH > SDD470-N10 OPERATION TO SET UP TO DRY D-470 D-470 HOT OIL Z 4 < 1 TIE NZ TO D-470 TO DRY < Z ESTABLISH FLOW ON ALL NOZZLES .0 OP .0 .0 0 0 0 > > SDD470-N11 DRY D-470 D-470 < 1 DRY D-470 12 HOT OIL 4 .0 N2 .0 N2 0 .> SDD470-N1Z REMOVE BULL BLINDS & FITTINGS ON D-470 D-470 <0 HOT OIL .0 PF .0 PF 0 SOP^'-NZ CLEAN D-470 D-470 16 HOT OIL 1 CLEAN D-470 2 HAS TO BE CLEAN & READY FOR V/E D/W D/W SDD470-N3 PURGE D-470 D-470 < 1 PURGE D-470 WITH AIR HOT OIL 2 4 .0 OP .0 0 0 > SDD470-N4 PULL MANWAY ON D-470 D-470 < 1 PULL 24" 300# MANWAY HOT OIL 0 5 .0 PF .0 PF 0 SD0470-N5 RUN BAG SAMPLE ON D-470 D-470 HOT OIL Z 4 .0 OP 0 00 A 019135 CONFIDENTIAL OPEN PLAN ACTLINE PROJECT: PROJ146I DOW CHEMICAL LAD ACTIVITY LINE ITEM LISTING by ACTIVITY NUMBER Filter: EQUIP = 'D-470 METHANES SHUTDOWN 1461 PAGE: 5 REPORT DATE:28MAY93 TIME NOW:15-AUG-Q7:00 act ! iy DESCRIPTION <LINE EQUIP LINE-DESCRIPTION ENGR AREA < 1 RUN BAG SAMPLE ON D-470 < 2 INSPECT FOR INTERNAL DAMAGE < 3 NDT V/E INSPECT FROM MANWAY OUR CAL MAN_HOUR$ TYPE WORK CREW CHAMPS MAN-HRS .0 .0 .0 C.E. CODE QUANTITY 0 0 0 MHrs/EACH > .> *> *> SDD470-N6 SEND D-470 TO SHOP D-470 HOT OIL 4 < 1 SEND D-470 TO SHOP FOR REPAIR 5 8.0 PF 8.0 PF 0 > SDD470-N7 REPAIR D 470 D-470 30 HOT OIL < 1 REPLCE NOZZLE H 24" 300# < 2 REPLACE NOZZLE C 1-1/2" 300# < 3 REPLACE NOZZLE L 2" 300# < 4 CMP TO INSPECT D-470 PRIOR TO HYDRO < 5 HYDRO D-470 TO 450# FOR ONE HOUR 4 .0 FAB SHOP OUT .0 0 .0 0 .0 0 .0 0 .0 0 > > > > > SDi N8 SHIP D-470 BACK TO CMP D-470 < 1 SHIP D-470 BACK TO CMP HOT OIL 4 5 8.0 PF 8.0 PF 0 SDD470-N9 SET UP TO DRY D-470 . D-470 < 1 INSTALL M/W LOOSE 24" 300# < 2 LOOSEN UP ALL 10 B/B'S HOT OIL 2 5 8.0 PF 2.0 6.0 PF 0 0 SDD470-01 INSTALL NEW D-470 D-470 HOT OIL 9 < 1 D-470 WEIGHTS 45,600# < 2 INSTALL NEW D-470 < 3 REINSTALL VALVE ON NOZZLE D 3" 300# < 4 REINSTALL VALVE ON NOZZLE M 2" 300# < 5 REINSTALL VALVE ON NOZZLE E 3" 300# < 6 REINSTALL VALVES FOR LT-8975 2" 300# 5 52.2 PF .0 4.0 2.8 2.0 2.8 4.0 PF 0 0 0 0 0 0 > > > ,> .> ,> ,> ,> ,> DO A 019136 conftdfnttai. OPEN PLAN ACTLINE PROJECT: PROJ146I AcV . TY DESCRIPTION <LINE EQUIP LINE-DESCRIPTION DOW CHEMICAL LAO ACTIVITY LINE ITEM LISTING by ACTIVITY NUMBER Filter: EQUIP = 'D-470 ' METHANES SHUTDOWN 1461 PAGE: 6 REPORT DATE:28MAY93 TIME NOW:15-AUG-07:00 ENGR AREA DUR CAL MAN_HOURS TYPE WORK CREW CHAMPS MAN-HRS C.E.CODE QUANTITY MHrs/EACH > < 7 REMOVE B/B ON STRONG BACK < 8 REINSTALL LSHH STRONG BACK & VALVES < 9 BOLT UP HD-2010 20" 300# < 10 BOLT UP HD-2056 6" 300# < 11 BOLT UP HD-2029 16" 300# < 12 BOLT UP HD-2058 3" 300# < 13 REMOVE B/B'S VENT AND C/L < 14 INSTALL VENT TO C/L SPOOL < 15 REMOVE B/B'S FROM 3 WAY AND SPOOL < 16 INSTALL SPOOL TO 3 WAY VALVE < 17 BOLT UP N2 LINE TO PSV'S 3.0 3.0 8.8 2.6 7.4 1.8 1.5 4.5 1.5 1.0 1.5 0> 0> 0> 0> 0> 0> 0> 0> 0> 0> 0> SDD470-P1 REINSTALL D- 470 INSTR. D-470 HOT OIL 6 < 1 REINSTALL PSH-8991 < 2 REINSTALL PT-8977 < 3 REINSTALL LSHH-8976 < 4 REINSTALL LSL-8979 < 5 REINSTALL LT-8975 < 6 RECONNECT D-470 GROUND CABLE 5 12.0 I/E 2.0 2.0 2.0 2.0 2.0 2.0 I/E 0 0 0 0 0 0 > > > > > > SDD470-Q1 PRESSURE TEST D-470 D-470 < 1 PRESSURE TEST D-470 HOT OIL 4 4 .0 OP .0 0 0 .> SDD470-Q2 START UP D-470 D-470 * 1 START UP D-470 HOT OIL 84 .0 OP .0 0 0 > SDD470-R1 COMPLETE INSULATION ON D-470 D-470 HOT OIL 6 < 1 COMPLETE INSUL ON D-470 < 2 INSULATE 16" RETURN LINE AT D-470 < 3 INSULATE 2" E-52 RETURN LINE < 4 INSULATE 3" PUMP RECIRC. LINE < 5 INSULATE 8" BYPASS R-250A RETURN 5 42.0 INSUL N .0 14.0 4.0 4.0 10.0 0 0 0 0 0 .> ,> .> .> .> DO A 019137 CONFTOFTNTT Al. OPEN PLAN ACTLINE PROJECT: PROJ146I DOW CHEMICAL LAD ACTIVITY LINE ITEM LISTING by ACTIVITY NUMBER Filter: EQUIP * 'D-470 ' METHANES SHUTDOWN 1461 PAGE: 7 REPORT DATE:28MAY93 TIME NOW:15-AUG-07:00 ACW i'Y DESCRIPTION EQUIP <LINE LINE-DESCRIPTION ENGR AREA DUR CAL MAN_HOURS TYPE WORK CREW CHAMPS MAN-HRS C.E.COOE QUANTITY MHra/EACH > < 6 INSULATE 8" BYPASS R-250B RETURN 10.0 0 00 A 01.913R OONFTDFNTTAl. D-470 COOLDOWN PROCEDURE Prework: Scaffold E-52 return valve. This procedure assumes: a. HCI Purification is down . b. Both R-250's are down, padded and depadded, and purging with nitrogen to atmosphere. c. Only one hot oil pump is running. See attached drawing. 1. Manually block in oil to and from E-52. 2. Manually block oil to and from R-250A. a. Block in FCV upstream valve. b. Close flow control valve on TDC. c. Block E-470 valve to R-250A temperature control loop. d. Block E-480 valve to R-250A temperature control loop. 3. Manually block in 475 psig steam to E-470. 4. Line up E-475 cooldown loop. a. Turn on E-475 fan. b. Slowly open 3 valves near P-475 to allow hot oil to fill up cooldown piping, (see drawing) c. Slowly open R-250B cooldown HIC valve (HIC-6066, TDC group 151, slot 6) until it is 100 % open. 5. Manually block oil to R-250B. a. Block E-470 valve to R-250A temperature control loop. b. Block E-480 valve to R-250A temperature control loop. 6. Monitor the R-250B hot oil flow to ensure oil is flowing through E-475 and back to D-470. 7. Monitor the oil temperature in D-470. When the oil gets below 90 deg C, we will begin putting it in T-252. ' oX JJS 6/93 D-470 DRAIN AND CLEARING PROCEDURE Prework: Ensure T-252 level is low enough to handle D-470 liquid and associated piping. Run tubing to low point D-470 to T-252 (See tubing drawing). Cut a red tag master for pulling D-470 master and write out tags. (See attached list) Scaffold D-470. Locate 3 P-470 AOV clamps. This procedure assumes: Procedure. temperaturefrrD-470 is below aft deg C. See attached drawing. ^rXlosetbe up^ri^Vedrcutatk^ ailow oil - from 0-470 to enters 52r Monitor both the drum andtahk feveTon TDCTai well as *jie"tjressure^^|HhS?H th^Tield. W^Cfose the R-25OB FdVZ^tream- ti&SgfflgWttttTySiS wefasthe R-250B Jk.V. IT* 4. Shut off E-475 fan. fWben CbA&aOt^mpty;goTo theF4Wpumps and shutdown the running pump -when it gases out. - 6. Close the D-470 pressure control valve and pressure up D-470 to about 25 psig. Note: There is a hole in the manway so rope off the area to prevent anyone from being hit with a oil laden mist. 7. Low point D-470,to T-252 via the prerun tubing. When complete open bleeds to ` ensure all the oil is removed. 8. Red tag the system as per drawing. JJS 6/93 00 A 01914? CONFTDFNTT Al. P- 47& PfKfitlN X JJV fi/93 DO ^ DT91 ^ CONFIDENT 1 Al t - 'i; 2 *r f> r* o Li^f' OJJ (S/?> f>u`-Lis'c D 47 $ f* >{jc/i//'7Yo ~y Opf/J / CLSl> JC i D- 470 fey UPiffvfrt/v, G.*/. C z D, 47o re/ PY/vui c?./. C- 2 fo 0.41* bo&ftjM 8. /. c 4 pc / Byr/Uj f. / c S .'2*0/? Pc*' Ufjr/te/c'i 6. 1/ c C P-'?5o^ pc/ gucto WLl/t o 1 fc-Z5o pc/ p t/. c 2 Z 'Z5. e Pc u Pi f/f On /- c 4 |Z'Zyf pc*/ 2lFF^ Mc/G 0 10 E'&l Q\t- KT(U g. */ c U f- 41<3 fife/fie G-^' <L \% f47o ^trr-n' terrp 0 (3 P'47o/4 dLArtP P-WA F{} t>rr 15 f'il^A t\oV S^t*cU C 1C p- +7cg O-tfAV `7 f>- 47s ?ls U p-4pl? AoV J'rJl'ftn if p-47*c cw/ip Z-o P' 47*6 ffs P/T? C Off Zi P'4 7<>C Z'0 1/ -Hc/'T'cip C \ 9 DO A 019144 CONFIDENTIAL - * & "A c 1 c C\ 00 A 019145 CONFIDENT!Al CHECKLIST (ATTACHMENT 1) NOTIFICATION OF PROCESS CHANGE CHECKLIST Originator: CtSZE'i ............................. Date of Origination: o i f- T/?* P - ' Date of Change .......7"....?=?.............................. Area: Hot oil (HYQR' ........ ./................. Temporary ........................ From ................................. To ...................................................... Description and Location of Change (Scope) ........OiL____ frJkHHf......................kfJJJL................................. rk.......BJ*. \AJ [Aj,OU-sb ssfiA___ Technical Basis for Change:._.................. _____ !ci?..................................... ..............^k.?,.......isSd...(A.......HAfi.___ _______ i--| 0/J r/iif /liter Trt'hf >7.............. ......................f*........... 'A r/'<r' 0 /w UviATfosJ At Q-qte Cur Ll^r\................................................v.../..f................................................ Impact on: I____ I Safety I____ I Loss Prevention I___ I Environment |___ | Health Type of Change;____ ii I I Alarm 1------1 Shutdown Point Instrument Process Computer Control Addition or Removal of Equipment [*] Piping Modification 1____| Equipment/Material Modification Job Procedure I----- 1 I I Other Pre-Modification Checklist: Applicable N/A Initials || I___ | Chemical ~7 ^7 Consult piping and equipment specifications. Perform Reactive Chemicals testing. l/7/93In-Progress? Add materials involved to Toxic Substance Control Act (TSCA) inventory. Calculate impact on F&EI and CEI IZ J 7 Comply with Engineering Practices. Comply with Technology Center guidelines. Comply with Dow "Environmental Protection Guidlelines for Operations". Comply with Safety and Loss Prevention requirements. _.lZ Consult maintenance. (Name)__ _______________________C21i7A_____ Consult instrument and electrical technician. (Name)_________ Consult parts technician.(Name)____ _____________________ ___________ Evaluate and modify relief system.(Name)_________ __________________ 7 Contact Industrial Hygiene.(Name)..,,_________________________________ 7 Contact Process Engineering. (Name).________________________________ / Complete required reviews. (Name them)____________ ________________ "7 Other Post-Modification Checklist: (Before startup) 7~ ~7~ "7 / 7 3H Perform pre-startup audit. Instrument loop drawings. Electrical drawings. Complete or update training program. Job procedures written and approved. P&ID's, process flow sheets and plot plans updated. Personnel trained on the change. Critical instrument checklist updated. Computer code and documentation changed. Department Head/Superintendent &J2JS-L______ Fwm No 470-00162-291 DO A 01.9146 CONFTDFNTTAI KCi) ft\C F**- PCaoiaC Hr o/c. 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