Document 3or7KMgkkn2DJwY2VzpMVZwJ
A s e r i e s o f e x p e r im e n ts w as made i n B - P l a n t t o : ' - ? ' ' >
determ ine th e amount o f le a d exposure encountered in v a tia n s
p laces.
- .... .
.
"
The p r o c e d u r e w as t h e sam e-'as. t h a t u s e d i n 'p r e v i o u s "' '-: ' l ' :'4
d e te rm in a tio n s, th e d e ta ils of w hich can be o b ta in e d by r e - . f e r r in g to th e r e p o r ts w hich have been su b m itted in th e p a s t. '
The d a ta o b ta in e d a re l i s t e d on th e a tta c h e d s h e e t.
The r e s u l t s in d ic a te th a t p ro g re s s i s b e in g made ,
;
tow ard red u c in g le a d exposure in th e e n tir e p l a n t . The s t i l l
:
f lo o r o f th e m ain b u ild in g shows a d ecid ed im provem ent. The
v;
a llo y and s m e lte r show some im provem ent, e s p e c i a l l y around
,
th e g rin d e rs (w hile f i l l i n g th e h o p p e rs), and a t th e sla g g in g
door of th e fu rn a c e . The p o in ts o f g re a te s t exposure d u rin g -- ;
t h e s e i n v e s t i g a t i o n s seem ed t o b e o n `t h e f o u r t h f l o o r o f t h e
m ain b u ild in g and in th e a llo y b u ild in g g enerally. The fo u rth
flo o r exposure ap p aren tly i s due to d iffu sio n from th e en clo su res
d u rin g th e p e rio d when th e an g le v a lv e i s open. E xposure in th e
a llo y b u ild in g is q u ite g e n eral, due to th e presence of lead
d u st alm ost everyw here. The o p e ra tio n s of c a s tin g and g rin d in g
seem to be th e most h a z a rd o u s due to le a d fume from th e h o t
a llo y in th e f i r s t case, and to o ccasio n al b its of a llo y d u st
g e ttin g .in to th e a i r in th e second c a se . However, in b o th
.
in sta n c e s th e heavy lea d p a r tic le s s e ttle to th e low er le v e ls
so th a t am an stan d in g e re c t is su b ject to but l i t t l e of th e -
t o t a l le a d th a t e sc a p e s. -T h is c o n tin u a l d iffu s io n from c a s tin g
and g rin d in g acco u n ts la rg e ly fo r th e le a d d u st w hich can and
-
' does a c c u m u la te /in m ost; p la c e s .. T h e 'o p e ra tio n of sla g g in g in '
,, t h e s m e l t e r h a s 'p r e v i o u s l y , b e e n st h e j g r a t e s t s o u r c e o f e x p o s u r e - ',
i n t h i s b u i ld i n g . The" u s e o f an im p ro v ed h o o d o v e r t h e s l a g -
,
' . g in g d o o r seem s, t o have"-reduced ..th is h a z a rd t o a minimum. The' - ,
exposure in o th e r p a r ts 'o f th e p la n t is in te rm itte n t and is--
_
' c h ie fly ' due to em ergency' c o n d itio n s re q u irin g th e d ism an tlin g -
of equipm ent, e tc . The d eg ree of exposure can be k ep t to
'
o minimum' i n t h e s e c a s e s by s t r i c t a d h e re n c e t o t h e s a f e t y r u l e s t h a t
* have been fo rm u lated by th e A rea and th e P la n t.
o o
I n g e n e r a l , i t may b e s t a t e d t h a t t h e l e a d e x p o s u re
i n 3 P l a n t h a s a p p a r e n t l y b e e n r e d u c e d s i n c e t h e l a s t s e r i e s o f ::y .
o te s ts . C ontributing fa c to rs to - th is red u ctio n are th e in s ta lla tio n ' -
o f new m e c h a n ic a l s a f e g u a r d s , im p ro v e d e q u ip m e n t, a n d e f f e c t i v e '-if"-''
Ut s a f e t y e d u c a tio n .- o f t h e o p e r a t i n g an d m e c h a n ic a l d e p a r t m e n t s . . y.;!
A tte m p ts t o s t i l l f u r t h e r r e d u c e t h e h a z a r d , o f l e a d .e x p o s u re a re - ,T' ' -
b e in g Made and o th e r s e r i e s , o f t e s t s w i l l b e c o n d u c te d p e r io d ic a lly .- ;
ECI ICR*
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Place
Time o f Run V o l .o f Air Amount o f le adcs
F lo o r b e t.p o t rooms 1-2
Top f lo o r
Tep p o t #1
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#2
#3 #4
#6
24 hours
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Bucket c o n tr o l room f! tf tf
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24 ti
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DUST SAMPLES
Pla.ce
Top a i r d u ct ( s m e lte r) Top f u rn a c e Top s t r i n g e r F lo o r
f > Lead
15.0
4 9 .0
10.0 22.0
Too g r in d e r hood
Office flo o r
F irst flo o r
Second flo o r
T hird flo o r
A ir
it
d u c ts
ti
( (
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" ( 3d
)
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.
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6 0 .0
17.0
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23.0 ^ ,
4 6 ,0
52.0 13.0
:
-
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^S pecial co n d itio n suck as changing f i l t e r bags, p u llin g plug
cock core, e tc . S p ecial p la n t sa fe ty r e g u la tio n s apply in th e se
cases.
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