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After thorough study of data derived from sample# obtained in this plant, the following specific recommends*fclone are ra&dei
1* Installation of a properly d#ei$ne& exhaust ventilation system In the misting, room of Swlldlng k*
2* iK|ai3Pe#nt that men making in dusty freight eara war duet respirators. With regard to the first of thee#* it it important. If tele
dependence ia placed upon the ventilation system, that hood# be properly placed relative to mlxer# and that hood entrance velocities be such as to insure collection of all highly aoao&tpted duct* given off by the operation of charging tM mix*#** Tfe* appended blueprint shows location of sassplins points' In the mixing room and analyses of the corresponding sample* & careful study of these data should give some Idea M to bh# parte of the room where ventila tion is most needed* It mmm advisable to locate hoods neat* each mixer in such a way that all dust generated by charging mixers would be drawn into the spate end away fro the operators* If it proves to be Impractical to do this for all mixers,' It defiedtoly should be done for all,those In which lead or ellieu paints are mixed- and those palate should never be mixed in other machines*
In addition to hood# located near the aixers, there should be exhaust ventilators located in all parts of the room where dry dusts are stored and handled* tm such places are indicated on the drawing by samples number 28 and number k* it may be stated in
HE 0013342
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general that any operation Involving the handling of dry, dusty sateslsl**- either openly or contained la paper hags, la potentially a generator of hasardeit* dust concentration la the surrounding air* Any #aa* of collecting this dust at it* sears# may ho th* swans of maintaining lorn dust soneeatrstlon* la the t$mtittdlag alr*
There is eonsidenttole difference between condition in the
plant as a whole in. $wmmr and those in winter* & comparison of staple* taken in sumter (fuly) with those taken in winter is tabulated in Table %, taking average results of all- simple taken in the mixing
reon at each time xoept that Sample taken near mixer during opera tion of ebarging are omitted*
TAUL3 1 caparison of Average Duet Samples taken in Mixing Hoorn
SttMnsv
Winter '$ Xneresss
Dust -Concentration* article .per cu* ft* . 1.233.500 . 6*?39.aoo
hZk
________________________________________________________ ____Skills .0*938 -...... 59*
.
These data are easily aaeeunted for by observation of ventilation oond.itions during the two extreme seasons of the year* In mmm? th plant is operated with most window open and natural ventilation gives rapid change# of air within the plant* In winter th windows are all closed and with a obmm ot air occurring very seldom, concentration# of dust and ether contaminants continually increase throughout the working day* This is particularly true of the most minute particles which remain In suspension Indefinitely, instead of settling out a do th# larger particles* since these
X 0013243
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stmXX particles do not settle* the only means of eliminating them Is by ventilation*
f&BtM XI Special Samples Showing Acute Exposure (July, 1^0)
Sample 1 2
11 12
Dust Count
'l5&d Cone*
Location ............... .. Operation................... .Fartidea/oe*ft * . Hj /10 u*H*
Charging Mixer Ho# 6 for
Mixing Hoorn Paint Bo* ?82, Mellow aloes
a#t^#soo
0*165
White
Charging Misers 1 and 3' for
Mixing Room Faint Ho, 1005, Sigh stand-
8*840*000
1*5$
.. ..w^U.
__t.. _____ ___
Receiving 'Unloading freight oar of department leaded %in oxide
20,l45#600
25.?
Receiving Unloading freight oar of Deportment Titanium Oxide
11,055*200^
2.25
Table XX shows analyses of four sample taken under unusual cottditione# Samples X and 2 were taken near sixers during the cM?g* lug operation in gurneer* the analyses show that the won engaged in these operations are atifejest to Jmserdou* oonoontratioiui of dust for th short time required for charging %hm sixers* Continuous exposures to fmoh oonoentr&feions would oonttffeube a deageretts besard# However* tbs chief slgnlfloanee of those data is'that it- indicates the principal origin of hygienic dust in the mixer roost* namely the operation, of charging the mixers with dry powdered mterisle*
Samples XX and XSL mm taken inside freight ears which were being emptied of leaded. sino oxide and titanium. oxide respectively# Both doors of each ear mm pen but neither was ventilated by any artificial method* The materials wore contained in paper bags* The bags were moved by hand from the floors of the oars to skids upon
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which they were sieved and stored until Deed, the tins# required for unloading a ear le approximately three how# depending upon the number of men working*' For that, length of time, exposure to air con taining 25*? milligrams of particulate lead per ten cubic stater* 1
an extreme exposure which definitely should be eliminated* Forttmately such lead concentration# arc met only In ear# leaded with duct# whoa lead content la very-high* These do not occur often enough to have
caused serious exposures of the mm %n the past. since it might be impractical to- attempt to ventilate the
care la a way that would effectively eliminate the h&gard, the use of respirators has been previously and is again roeouwended In the unloading of all freight cars containing powdered xaterlal#*
Fable 1X1 contains.results of analyses of all samples taken in the plant# Those which arc- indicative of particular feasarde have been discussed above* In general* it may bo stated that all those which show lead concentration* below 1*0 milligram per 10 cubic meters and duet counts of leas than X*$0O#QQ0 partlole* per cubic foot indicate condition# that arc safe from thee# hazards* The dust count of 2*10^*000 shown for the grinding room la mt a dangerous condition but is aimply higher than normal due to poor winter ventila tion in that part of the plant*
- The analyses of dust scraping# from- the mixing room indicate that over a long period of time the lead content of atmospheric duets in the mixing roots is about 8*736 by weight* This wa# determined by analysing for lead eaapla* of the dust which has settled over such things a# pipes near the celling and motor starter bofe on the walls*
001 3345
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Finally it.
that a thorough final ebook bo
mad* on whabavdr roiadi*l soaaiaroa *r taken to tlimiimto bh* daub
bastard fro fehlo plant* ganploa of airborne dust ahooM bo takon
at tb broafefcint point of salxor operators and aloe in part* of bh
room wboro so daofe i g*ao*ato& bo soo If ttao ^ma&at ovoroll
haaard 4 *XX a bb looal aouto ba&$?3t bato boon roKOvod*
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