Document 64GvDD3ZmRyx9Y6o9p7zvnJ6
August 7, 1985
Bill Leadford Industrial Hygiene
cc. Bob Norman Max Williams Sylvia Bray
Re: Benzene monitoring of RE-54 Cleaning
The depropanizer and debutanizer columns at LHC #3 have a fouling problem due to polymer formation. The polymer tends to collect in the column reboilers and cause plugging problems, it is necessary to clean a reboiler about every two months. The job involves isolating the reboiler, decontamination, line opening, and hydroblasting the system. The personnel exposure to benzene had been shown to be below the current TLV of 10 PPM, but with the proposed 1 PPM TLV it was felt that the job should be re-examined. Personnel were monitored for benzene exposure using 3M organic vapor monitors.
Both Dow and contract personnel were monitored for benzene and toluene exposure. The average time-weighted benzene exposure was 0.87 PPM with a high of 2.93 PPM and a low of 0.22. The average time weighted toluene exposure was 0.24 PPM. Respirators were worn during the line openings. Respirators were not worn by the people doing the hydroblasting. Face shields do not cover a worker's face very well if the person is wearing a standard respirator and the face shield took priority over the respirators. Special full face respirators have been ordered for use by hydroblasting personnel. The monitoring does point out a potential problem area. The procedures for working on the depropanizer and debutanizer will be reviewed with the intent of minimizing personnel exposures.
Jerry E. steward LHC #3
DO 081485 confidential
INDUSTRIAL HYGIENE MONITORING OF THE PREPARATION AND HYDROBLASTING OF RE-54 DURING NORMAL OPERATIONS.
PERSONNEL WERE WEARING RESPIRATORS DURING LINE OPENINGS BUT NOT DURING HYDROBLASTING.
DOW PERSONNEL-DAYS 7/17/85
NAME
ID #
TIME
PPM--TWA PPM--TWA MONITOR BENZENE TOLUENE
iM j j M H
A.R. LEE H. THERIOT R. McCELLAND R.V. PEAIRS
433197 220015 432829 432906
360 MIN 360 MIN 360 MIN 360 MIN
PR9248 AU9357 AU9386 AU9368
0.81 1.01 0.86 0.65
0.14 0.31 0.26 0.01
Average 0.83
0.18
CONTRACT PERSONNEL-DAYS 7/23/85
CTi (J1
L. MATHEINS 0. TAYLOR A. HERANDEZ D. ALLEN
600 MIN 600 MIN 600 MIN 600 MIN
AU0513 AU0537 AU0410 AU0401
0.33 1.06 2.93 0.33
0.15 0.43 0.90 0.20
C
Average 1.16
0.42
DOW PERSONNEL--DAYS 7/24/8 5
9 A.R. LEE
433197 150 MIN AU9428
10 R.V. PEAIRS 432906 165 MIN AU9431
0.50 0.22
0.01 0.01
Average 0.36
0.01
TLV
Benzene - 10 PPM Toluene - 100 PPM
DO 0S1406 CONFIDFNTIAl
FILLED IN BY Q, . >/ft?/??oAJJ) PLANT Z//C ,-?_________ BLOCK A8
EMPLOYEE EXPOSURE SUMMARY DR# _________________________
QUARTER S
YEAR &S
IHG /o Pf?/??' '
CHEMICAL j&F/'j ?.'/Vg__________________ MINIMAL DETECTABLE LIMIT AND UNIT , o / PP/77
JOB NO. CLASS
OR________
PERSONNELEXCURSION AREA
PT TWA
NO.
EXCUR. NO.
*
EQ. BASIS SAMP. AVG. HIGH
C DURATION SAMP. AVG.
HIGH C
A tfP
,83 /, 0/
SAMPLE NO. DURATION SAMP. AVG.
* HIGH C
oo z"Tf o nO um a\>. z H Cfl M ~sj if
.
PROTECTIVE EQUIPMENT: (1) MOUTHBIT (2) FULL FACE (3) HALF FACE OR DUST <4 > AIR SUPPLY (5) HEARING PROTECTION
COMMENTS (use reverse side)
LH:sb
IH-2 (12/86) F0RM1
FILLED IN BY Q. / . PLANT ///C :>_________
EMPLOYEE EXPOSURE SUMMARY
QUARTER 3
YEAR &S~.-
___
DR# _________________________
IHG /c?cj P/? /y? '
BLOCK g CHEMICAL
/oCcf^n.T-________________ MINIMAL DETECTABLE LIMIT AND UNIT , g / PP/P
JOB NO. CLASS
PERSONNELEXCURSION_____________________________
AREA
PT TWA
NO.
* EXCUR. NO.
* SAMPLE
NO.
EQ. BASIS SAMP. AVG. HIGH C DURATION SAMP. AVG. HIGH C DURATION SAMP. AVG.
3 / //{'
-iS
,3/
v
* HIGH C
oO zq o
O am ti- Z -t 0) -i a> j>
1
PROTECTIVE EQUIPMENT: (1) MOUTHBIT (2) FULL FACE (3) HALF FACE OR DUST (4) AIR SUPPLY (5) HEARING PROTECTION
COMMENTS (use reverse side)
LH:sb
IH-2 (12/86) FORM 1
FILLED IN BY /?. Z. Z? 'S//? ,'j?oAj, PLANT /.//(. C___________ BLOCK
EMPLOYEE EXPOSURE SUMMARY
QUARTER 3 YElAR 9 S7
DR# ___________________________
IHG /O f'/?/?? '
CHEMICAL /^f-W
________________ MINIMAL DETECTABLE LIMIT AND UNIT . / >p/y?
JOB NO. CLASS
PERSONNELEXCURSION AREA
PT TWA
NO.
EXCUR. NO.
EQ. BASIS SAMP. AVG. HIGH C DURATION SAMP. AVG.
J> tO ///' V //^ o Ot Jp
* HIGH C
SAMPLE
NO.
DURATION SAMP. AVG.
HIGH C
oo z-n o *-i O aT1 Z--1 03 t-4
J>
PROTECTIVE EQUIPMENT: (1) MOUTHBIT (2) FULL FACE (3) HALF FACE OR DUST (4) AIR SUPPLY (5) HEARING PROTECTION
COMMENTS (use reverse side)
LH:sb
IH-2 (12/86) FORM 1
FILLED IN BY >. 6- /? PLANT ///r -?___________ BLOCK
EMPLOYEE EXPOSURE SUMMARY __ DR# __________________________
QUARTER IHG
YEAR
CHEMICAL
/
_________________ MINIMAL DETECTABLE LIMIT AND UNIT . j
'
JOB NO. CLASS
PERSONNELEXCURSION
AREA
*PT TWA
NO.
* EXCUR. NO.
EQ. BASIS SAMP. AVG. HIGH C DURATION SAMP. AVG. HIGH C
IS (Z->p>r. /yj/hn'r. 3 /o Sr. V
Sfo
SAMPLE
NO.
DURATION SAMP. AVG.
* HIGH C
n
oo Z"T1 o
Z? 3)
m-- MJN. O
PROTECTIVE EQUIPMENT:(1) MOUTHBIT (2) FULL FACE (3) HALF FACE OR DUST (it) AIR SUPPLY (5) HEARING PROTECTION
COfOTENTS (use reverse side)
LH:sb
IH-2 (12/86) F0RM1
EMPLOYEE EXPOSURE SUMMARY
FILLED IN BY j?. L - // 33#rtf o/'JO
DR#
PLANT cr/r , __________ BLOCK 3.3 CHEMICAL
ZFss/f
3QUARTER
YEAR
<r .
________________
IHG /cJ Pf/?7
MINIMAL DETECTABLE LIMIT AND UNIT 'Of 3 3f/f
JOB NO. CLASS
PERSONNELEXCURSION
AREA
PT TWA
NO.
* EXCUR.
NO.
** SAMPLE NO.
EQ. BASIS SAMP. AVG. HIGH C
DURATION SAMP. AVG.
HIGH C DURATION SAMP. AVG.
* HIGH C
0 3 OS
3 \3 tfp. 3L .31 s~o
r> oO Zo 'i r--l O o1
UTj-s1
-o -*
PROTECTIVE EQUIPMENT: (1) MOUTHBIT (2) FULL FACE (3) HALF FACE OR DUST (4) AIR SUPPLY (5) HEARING PROTECTION
COMMENTS (use reverse side)
LH:sb
IH-2 (12/86) FORM 1
FILLED IN BY Z?. . /?
PLANT i //r ^___________
EMPLOYEE EXPOSURE SUMMARY
QUARTER 3
YEAR &S .
DR# __________________________
IHO /q<j P f'/W "
BLOCK __ CHEMICAL
/ o c^/TA//r_________________ MINIMAL DETECTABLE LIMIT AND UNIT , ^ / &P/V
JOB NO. CLASS
PERSONNEL__________ _______________________
EXCURSION
AREA
*PT TWA
NO.
** EXCUR.
NO.
* SAMPLE
NO.
EQ. BASIS SAMP. AVG. HIGH C DURATION SAMP. AVG. HIGH C DURATION SAMP. AVG.
3 ? //jP-
- / .O/
* HIGH C
r> UV zo ~n MO O& rn -- 2 P* h ii M \t
PROTECTIVE EQUIPMENT: (1) MOUTHBIT (2) FULL FACE (3) HALF FACE OR DUST (l) AIR SUPPLY (5) HEARING PROTECTION
COMMENTS (use reverse side)
LH:sb
IH-2 (12/86) FORM 1