Document 938Gx2LOm1VyOqMnM3NJDe1g7
FILE NAME Brakes BRK DATE 1968 Apr 18
DOC BRK180
DOCUMENT DESCRIPTION Letter from Liberty Mutual Insurance Co. to Abex RE Inspection Results with Initial Inspection Report Attached
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Hygiene
Winchester
- 2 Corporation
American Brakeblok Division
WINCHESTER WRCINIA 22601 TIL 703-662-1573
April 18 1962
Huckebra Hygienist
Department Insurance Company
Campbell Avenue Virginia 24005
Dear Mr. Huckebra
In reference to your hygiene survey taken at our plant on January 23 and January 24 1956 for airborne lead and asbestos
The followingfollowing are corrections and actions that have taken place
SUBJECT Air Borne Dust
Your samples number 5 7 and 3
rubber gasketing is being replaced on top
area Also dust leaks down the sides near
hoppers
also
of all hoppers the gates in
the
The
area
operator is
to create a
being instructed not to draft He is also being
instructed to open
the clam shell on the bottom of the mix buggy with caution not
to open fully all at once to keep from creating creating as much dust as
possibposilble e Also when opening the bags of asbestos asbestos he is to keep
the
bag bag
below the
intake
duct
so
it
it will
receive
as much dust
as
possible possible This duct is working to its maximum capacity This
should be very effective for this area
PLAINTIFF'S
KAZ
002916-
Huckebra
The intake draft system in the
functioning properly This will be the gasketing is installed
Reppers 2 in each 1 is
much more effective after
Your sample number 11
This operation was observed by plant engineering and myself and we found the intake draft system working at its maximum
capacity On our first observation of this they were dumping
our most dusty mix
All dust was being drawn up the intake
draft even the dust escaping from between the lower boards in
the mix buggy
The day the survey was taken we feel the gates
on the dust collector could have possibly been partially closed
or the collector'not working at its maximum capacity
.
now is clear of cust
The area
Your samples number 12 and 13
The dust collector was found to be working at approximately of its its capacity It has been corrected
We have installed in the rear of each preform a canvas curtain to contain escaping dust from getting away from the intake draft and keeping it out of the general room air This has worked very effectively
On each preform scale we have installed an intake draft tube extending from the main collector to collect dust when the operator is weighing the mix This again will be very effective for the operators breathing zone and also the general area air
SUBJECT Air Borne Lead
Your sample nuncer 4 is answered under samples number 12
and 13 under Air Borne Dust paragraph two..
Your sample number 11 is answered under samples 6 number
7 and 8 under Air Borne Dust paragraphs and three
KAZ
KHALL02917
002917
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April 15
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1968
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We certainly feel corrections will be very
effective in contati he vn arioi us opn erag tors breathing
zanes and the general room air in the effected areas
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any
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feel free
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KHALL02918 002918
ABEX CORPORATION
AMERICAN BRAKEBLOK DIVISION
WINCHESTER VIRGINIA
Hygiene Survey for Lead and Asbestos
an 1s. wn a
R
. On January 23 and 24 1968 samples for airborne lead and as-
bestos dust were collected in the wet and dry compounding areas
in the book and the block press preforming areas and in the
block and the strip finishing areas
.
The lead samples were analyzed our Hopkinton Laboratory and compared to a Threshold Limit Value of 0.2 Mg c.m of
air
.
The dust samples were counted microscopically at 300X and com-
pared to a Threshold Limit Value of 5 mppcf
CONCLUSIONS
1 Asbestos in Air While some of the dust counts are above
the recommended level of 5 mppcf for asbestos containing dust examination of the samples under the microscope indicate that only a few of the particles counted are actually fibers
and the other appears to be dust other than asbestos Based
on these observations I am not inclined to consider these levels as hazardous as suggested by the total count but to tamper this judgment in view of the fact that something less than 10 of the particles counted were actually fibers
Reference to the data sheet will show that the grinding operations appear to be well controlled and the operations which resulted in the higher dust count were those which a large volume of air was displaced such as in the dumping operation and in the strip preform area
LIBERTY MUTUAL INSURANCE COMPANY
. KAZ
KHALL02919
002919
2. Lead Concentrations in Air Reference to the data sheet will
show only two were above the recommended Threshold Limit Value
of 0.2 c.m of air
One of these was general room air collected near press 8
in the strip preform area in view of the other levels in
this area and our observations this is probably due to contamination of the filter paper somewhere in the sampling and packaging technique All other samples collected in
this area were well below this level and those collected in
the breathing zone of the operator were well within the suggested Threshold Limit Value
The other high concentration of the airborne lead was collected in the breathing zone of the operator dumping the scale hopper on the wet compound line Our observation at the time was that a small plume of dust is released into the atmosphere when this operation is conducted
Even considering the fact that this operation takes only a few minutes about 10-15 times per shift this is still high enough to constitute a significant exposure and additional
controls are warranted
3 Exhaust Ventilation With the exception of the strip preforming and the dumping from the upper level to the lower level the exhaust ventilation equipment appears to be providing adequate controls These two exceptions are probably
due to the operation itself creating turbulent velocities
in excess of the control velocities designed for these installations and as a result dust is blown out of the influence of the exhausted environment Even though the
dust concentrations in these areas are not considered
severely hazardous they are high enough to warrant investi-
of gation into the feasibility either providing better en-
closures and increased velocities for these operations
March 8 1968
GWH
Dr. C. C. Blackwell Jr. Mr. Charles Borcherding
Industrial
W. Huakela
Huakela
Huakela
Hygienist
Loss Prevention Department
Liberty Mutual Insurance Company
LIBERTY MUTUAL INSURANCE COMPANY
KHALL02920
KAZ
C02920
INDUSTRIAL HYGIENE CORRECTIONS REQUIRED
1 Wet Compound Line - Mixer Exhaust It is recommended that all the mixers on the wet compound line be provided with an inward draft sufficient to control the puffs of dust which are released when dumping the weighing hopper
2 Strip Press Preformin angd Dumping Locations on First Floor
It is recommended that the exhaust ventilation on these
locations be improved either by increased velocity or in-
proved enclosure to a degree sufficient to control the puffs
of dust emitted when operating the presses and dumping the material from the upper level to the lower level
KAZ
KHALL02921 002921
DISCUSSION
On the days of the survey all operations appear to be operating
normally and for the part the exhaust ventilating equipment
doing job for appeared to be
the
|
which it was intended
1
As was mentioned earlier some of the dust concentrations are
above the Threshold Limit Value of 5 mppcf suggested for dust
containing asbestos However since something less than 10 1 of the particles counted were fibers it is felt that the
severity of the situation is not quite as serious as would be
the case if all the particles were fibers
MANAGEMENT INTEREST The interest of management and supervision in
providing a healthful environment seems to be carrying over well
to the individual employees During our survey we noted no evidence of ventilation equipment abuse or lack of respect
on the part of the individual employees
Since the exhausting of air contaminants for this plant is such an important part of the operation it is urged that continued emphasis be placed on quality maintenance and proper utilization
of equipment provided
KAZ
KHALL02922 KHALL02922
002922
DATA
Method of Collection
AIR BORNE DUST ___.
Collected in distilled water with midget impingers at the rate of 5 m
Method of Analysis
,
Counted with microscope at 300X using a
Spencer Hemacytometer Counting Chamber
Recommended Threshold Limit Value for dust containing asbestos _ 5 million particles per c ft of air mppef
SAMPLE # 1
2
4 5
6 7 8
LOCATION
RESULTS IN MPPCF
Breathing zone of the operator on automatic block chamfer grinder 810 - Note The exhaust installation on the grinder appears to have a good inward draft though enclosure might be improved to reduce amount of - flying material
1.9
Same location
2.3
Operator's breathing zone -
rough grinder 806
Breathing zone of the operato-r
automatic block chamfer 654
2.6 4.0
Operator's breathing zone - disc finishing operation 22 - machine 1209 ~ Note The exhaust appears to be doing a very good job of dust control at this operation
General room air in scale area
weighing material for wet mix line Little dust is apparent
in the area
'
Operator's breathing zone general
room air during the weighing of asbestos and emptying of the hopper
for the wet line
3.5 7.8
7.9
Operating breathing zone weighing asbestos and dumping for the wet
line
.
6.0
KAZ
KHALL02923
002923
Data
continued
Dry line weighing general room
air before weighing sabestos No dust apparent in the area
10
Operator's breathing zone weighing
asbestos for dry line only no other
operations included in this sample
11
General room air on the ground level where the mills are dumped into the cart Some dust noted to be escaping from the enclosure during the filling
of the cart
Operator's breathing zone in the strip preform area Some dust seemed to be coming out of the mole when the plate is placed on top of the filling Most
of the dust appears to be the tap
which is dusted on the moles
13
General room in the strip preform area
0.2 4.8
8.3
12.9 10.6
KAZ
KHALL02924
002924
DATA
AIR BORNE LEAD
Method of Collection
filter Collected on
pump
paper using vac~-nm
Method of Analysis
Dithizone method read on Beckman spectro-
photometer
Threshold Limit Value for air borne lead 0.2 Mg./c m
SAMPLE #
1 -2
3 4
LOCATION
RESULTS MgPb
Operator's breathing zone strip preform area mix 353
.01
Strip preform area press 5 operator's
breathing zone mix 154
.01
General room air in back of press 6 in the strip preform area
General room air back of press 8 in
the strip preform area .
.14 .21
General room air wet line compounding
.12
Operator's breathing zone block grinding automatic bur and chamfer grinder
General room air near dust collector
room in block grinding area
.02
Operator's breathing zone in dry mix dump area on ground level - dumping mix at the time of sample
General room air in dry mix dump area
during dumping
.10 .09
Operator's breathing zone with wet line compound weighing operation
.04
Operator's breathing zone during the dumping of the weighing hopper on the wet line - Note There is no screen on this mixer and a small puff of dust is noted to be generated when first starting to empty the weighing hopper
4.02
KAZ
KHALL02925
002925