asbestos awareness we 1
TRANSCRIPT
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Asbestos
Awareness
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What is Asbestos
Asbestos is the name applied to six naturallyoccurring minerals that are mined from the earth.
Amosite Chrysotile
Tremolite
Actinolite
Anthrophyllite
Crocidolite
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What is Asbestos
Three are used more commonly:
Chrysotile - white asbestos
asbestos cloth and cement products
Amosite - brown asbestos
heat insulation and pipe lagging
Crocidolite - blue asbestos
very high temperature and acid resistant purposes
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Asbestos Products
Non Friable the asbestos fibres are bonded by another
material
Friable
non bonded asbestos fabric or material is in powder form
can be reduced to powder by hand pressure
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Asbestos Products Asbestos was generally processed as:
Fibrous
sprayed preformed
Textile
woven
wound
Mixed with a binder
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Asbestos Materials
Friable products
sprayed fire retardant thermal lagging
fire blankets
welding blankets
backing to sheet vinyl floor covering
flexible connection
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Asbestos Materials
Non Friable
cement products
flat sheet corrugated sheet
pipes
compressed sheet
vinyl floor tiles
switch board
brake and clutch lining
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When is Asbestos a hazard
When asbestos fibres become airborne
friable- disturbance of loose or non bonded asbestos
non friable
- when the cement or resin breaks down
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When is Asbestos a hazard
Respirable Fibre
less than 3 microns in diameter
longer than 5 microns
with a length to diameter ratio greater than 3:1
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Health effects
The body cannot breakdown asbestos fibres.
Three primary diseases associated with asbestosexposure
Mesothelioma
Lung Cancer
Asbestosis
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Asbestos and your health
The potential for harm depends on:
fibre size and type
length of exposure
concentration of Respirable fibres
individual susceptibility
influence of other factors
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Identification of Asbestos
Materials containing asbestos are not readilyidentified.
Laboratory analysis
- X-ray diffraction
- Polarising light microscopy in conjunction withdispersion staining
- Electron microscope
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Limit asbestos exposure
Installed asbestos
be aware of any installed asbestos
asbestos register
Do not disturb asbestos
no drilling, cutting, sawing, sanding
no activities that creates dust
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Limit asbestos exposure
Housekeeping
ensure that damage material is repaired
replace broken or damaged ceiling tiles
Policy and Procedure
for accessing ceiling space
areas where friable asbestos is present- air monitoring, after hours work
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Management of Asbestos
DECS Asbestos Management Procedure
www.decs.sa.gov.au/hrhealthsafety/- Resources/Policies and Procedures
Regulations and Codes of Practice
www.workcover.com/ www.safework.sa.gov.au/
- Resources/Publications/Legislation & Codes of Practice
http://www.decs.sa.gov.au/hrhealthsafety/http://www.workcover.com/http://www.safework.sa.gov.au/http://www.safework.sa.gov.au/http://www.workcover.com/http://www.decs.sa.gov.au/hrhealthsafety/ -
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Airborne asbestos fibres
Membrane filter method Sample is collected by:
- drawing a measured quantity of air through a membrane filterby means of a pump
- filter is transformed to a transparent, opticallyhomogenousspecimen
- the fibres are then sized and counted using a microscope andeyed graticule
- the results are expressed as fibres per millilitre of air,calculated from the number of fibres and the measuredvolume of air sampled.
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Asbestos Shots..
Pictures and comments of the next9 slides by David Ellis, DEMS,
asbestos consultant.
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Shows 2 plugs with
Warning labels stuckover them.
Same plugs with one labeland PVC cap removed to
expose asbestos plug.
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A single plug with the cap missingwhite asbestos.
Plug has fallen down making it more visible.Lower right shows plastic former still in place from
construction. (These formers were supposed to have
been removed during construction).
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Two labeled caps with
white asbestos visible inthe underside of the slab
just right of a paper
label.
Plugs that have been
tampered with andresealed. Note a third
type of warning label.
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This is a view looking down on top of a
slab. The damaged carpet has been peeled
back to show the inside of the PVC sleeve
with white asbestos visible around the top
of the hole. Cables had been pushed up
through this hole to feed a floor fastened
power or telephone socket.
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This is unusual contamination on the under side of
a slab, approximately 50mm across.
A worker has thrown wet white asbestos up during
construction and it has remained stuck to the slab.
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Shows loose grey/brown asbestos (Amosite)
on top of ceiling tiles under a large water pipe.
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Shows a similar wall penetration with NON ASBESTOS fireproof packing. It is very difficult to distinguish between
asbestos and asbestos free fibrous material. All plumbing
waste floor penetrations so far have been packed with asbestos
free fibrous insulation.
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Shows white asbestos rich mastic sealant on an air
conditioning duct flange after the joint had been opened.
This is a well bonded form of white asbestos that cannot
easily be compromised without high temperatures, some
solvents or years of exposure to sunlight.
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There are many uses of asbestos to be found within and around our
environment, mostly commonly in the form of asbestos cement products.
It can be found as:
flat or corrugated sheets used mainly for garages and sheds
cold water storage tanks
external rainwater pipes and guttering
fascia boards as a lining cladding for fire protection
for internal partition walls
Asbestos cement is a hard, brittle, greyish material, however if there are any
suspicions that a product is asbestos it should be treated as such.
In DECS worksites, products known to contain asbestos should be marked
with appropriate safety signage. Refer to the worksites Asbestos
Register and to the DECS Asbestos Management Procedure
(www.decs.sa.gov.au/hrhealthsafety/)
http://www.decs.sa.gov.au/hrhealthsafety/http://www.decs.sa.gov.au/hrhealthsafety/ -
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While asbestos roofs are not common in
DECS worksites, they can be found in
some older worksites, and SA homes.
There are at least three types of asbestosshingles. Regular flat shingle tiles are
shown at top, common diamond shaped
tiles are shown at middle, and side-lap
tiles are shown below. It is difficult to find
asbestos replacement tiles that match theoriginal roof in colour shade. Note the
three replacement tiles on the diamond
asbestos roof (they appear whiter than the
original tiles).
Asbestos is a brittle and fragile material.
It cannot be walked on as the tiles will
crack and these hairline cracks, which are
hard to see, will leak. Fragile roof
considerations need to be made as well.
Signage is appropriate.
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Asbestos sheetson a roof. These
sheets are also
known as
Deep 6. This type
of roof is fragilewhen walked upon,
and appropriate
signage is required.
Painting the roof can
minimize hazards
associated with
flaking fibres.
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Some examples of Asbestos Signs
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Twisted yarn with asbestos fibre.
Extensively used as caulking,
sealing and heat insulating
materials on thermal installationsand heat conducting systems, eg
kilns (above), slow combustion
fire doors, incubators, mantles
and laboratory ovens (left).
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Asbestos fencing can still
be found. This is also
known as Deep 6.
Similar sheets were also
used in roofing. Note itsfriable nature when
broken or chipped. This
can be a hazard when
removing the fence, or if
it is rubbed against.
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Deep 6 asbestos
fencing with warning
signs.
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Another example of
an asbestos deep
6 style of fencing.
Removal of suchfences should be in
accordance with the
DECS Asbestos
Management
Procedure.
http://www.decs.sa.gov.au/docs/files/communities/docman/1/Asbestos_Management_Proced.pdfhttp://www.decs.sa.gov.au/docs/files/communities/docman/1/Asbestos_Management_Proced.pdfhttp://www.decs.sa.gov.au/docs/files/communities/docman/1/Asbestos_Management_Proced.pdfhttp://www.decs.sa.gov.au/docs/files/communities/docman/1/Asbestos_Management_Proced.pdfhttp://www.decs.sa.gov.au/docs/files/communities/docman/1/Asbestos_Management_Proced.pdfhttp://www.decs.sa.gov.au/docs/files/communities/docman/1/Asbestos_Management_Proced.pdf -
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Carrels, common in the
later half of the 70s
and in the 1980-s, can
still be found in some
schools. They are often
located in time out
rooms, resource
centres, and languagerooms. The surfaces
are often defaced, due
to the secluded nature
of the space. Asbestoswas often used as a
base, underneath the
soft plastic/leather
surface.
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Backing to sheet vinyl floor covering can be made from
asbestos, as pictured above.Vinyl floor tiles can contain asbestos in the tile mix, which
deteriorates over time, and can release asbestos fibers. Such
flooring should be replaced, or covered, if deemed a hazard.
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Asbestos
thermal
lagging
around
pipe work
Asbestos
cement
flue pipes
Another example of asbestos products found in worksites.
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Asbestos thread can be found on gas mantles, used in camping
lights. Radioactive Thorium is also present in the mantle
material. (Thorium when heated by LPG flame, emits radiation that is weighted lessheavily in the infrared and more heavily in the visible spectrum, leading to an enhanced
output of useful light ). Wash hands after handling.
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Asbestoswhite substance in the ground in this picture
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Crushed asbestos and mud
Asbestos