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Copy of Asbestos Awareness
Transcript of Copy of Asbestos Awareness
First used by the Ancient Turks, Romans, and Egyptians 2000 years ago to make wicks for oil lamps and cremation cloths
“inextinguishable, unquenchable, inconsumable,”
In the late Industrial Revolution asbestos cloth became useful for steam engines, boilers and piping from 1866 onward.
1977-1986 Subsidized insulating of ~242,000 residences through the
"Canadian Home Insulation Program"
1940’s Asbestos transferred to commercial and industrial buildings
1930’s Spray fireproofing in military ships and trains
1904 About 75% of all steam carrying systems in the
US insulated with asbestos
the product came into wide use in the early 1900s, because of its ability to hold heat without catching fire.
derived from a Greek word meaning
What is Asbestos?
Asbestos is a naturally occurring mineral mined from the earth
High Insulation Factor
Stronger than steel of the same weight
The Magic Mineral
Friable Asbestos - material when dry can be crumbled, pulverized or powdered by hand pressure, generating respirable dust
Non-Friable Asbestos - material which cannot be crumbled, pulverized or powdered by hand pressure
Water / Liquids
You can use these breathing rates to calculate how many fibres might be breathed in. For example, a worker (without a respirator) breathing at a rate of 25 liters per min, in an area for 8 hours where the fiber levels are one fiber per ml (f/ml), would breath in 12 million fibers. Calculated as follows:
25,000 ml/min x 480 min x 1 f/ml = 12M fibers!!
Fibrotic scarring of lungs (latency 15 years +)
Prevalent with large dose exposure over a long period of time (asbestos/construction workers)
Typical latency period of 15-30 years
Asbestos exposure is a contributing factor to lung cancer (latency 15-30 years +)
Smoking increases cancer risk with asbestos exposure by 50-90 times
Cancers of chest cavity lining and lining of abdominal cavity predominantly associated with amphibole exposure (latency 30-40 years +)
Quite rare and some occurrences in the absence of asbestos
Some cases of low level exposure (i.e., family members of factory workers)
Before you can select what precautions you need to take to protect yourself from exposure to a hazard, you must assess the “risks” involved and the type of hazards that you may encounter in performing the work activity. Normally the risk will be divided in four categories:
"qualified person" as someone who:
"has knowledge of the management and control of asbestos hazards through education and training, and"
"has experience in the management and control of asbestos hazards."
Single Use (Disposable) NO!!!
Half Face Mask Air Purifying
Full Face Mask Air Purifying
PAPR (Powered Air Purifying)
Supplied Air Pressure Demand
The most important element of an effective respirator program is fit testing; a respirator that has not been fit tested is not protecting you.
As important as the respirator selection is the cartridge selection. You must select the cartridge which is designed for the type and make of respirator you are using and the appropriate hazard type.
Make sure it is comfortable (buy oversize no need to use “Tyvek” only)
Elasticised cuffs and booties!
Clothing underneath coveralls only when undertaking moderate risk work
Tuck booties inside of gum boots in modified moderate risk and high risk work
Repair tears immediately
Can be re-used on moderate risk jobs
Bag immediately on completion of work
Wear respirator UNDER hoody!!
It belongs to the group of "crystalline silicates" just like quartz, however, asbestos crystals form in long thin fibres
types of asbestos:
Chrysotile from Canada
Amosite from Africa
also called grunerite
Crocidolite from Africa
The import of crocidolite peaked in 1950, fell by 25% in 1960 and by 88% in 1970.
What it is
Where to find it
& How to Protect yourself
How is it mined?
Open Pit mining &
Processing required for asbestos
No additives, bleaching, melting, or steaming required
Simply crushed and sifted into:
Canada was a major global exporter of asbestos until
Shipped around the world to:
China, India, Thailand, South Korea, Sri Lanka...
is it coming back?
Cassiar Mines, BC
1953 - 1992
1999 - 2001
Cassiar, produced ~380 tonnes/day of raw asbestos
At today's disposal costs that's about £80,000/day to dispose of it
40Million spent to keep mine operational
Cassiar Closed 1999
Jeffery Closed 2011
Legal in Canada to make non-friable products
Legal to sell raw asbestos overseas
Legal to import asbestos products
canceled in Oct 2011
How long have we known about Asbestos
We exported 178,000 tones/year as recent as 2005
Blocked a unanimous vote to add chrysotile to the Rotterdam Convention on internationally recognized hazardous materials
How many uses of Asbestos could there be?
Never been replaced by mineral wools, fiberglass, or ceramics
Asbestos is a respiratory hazard, therefore the risk of harm is based on it becoming airborne
What Does Asbestos Do To The Body?
First, it must get into the body...
Routes of Entry
Airborne fibers are small enough in size that they are inhaled deep into the lungs (5-10 microns in length and 1-3 microns in diameter).
The Respiratory System
The Respiratory System
The body's need for oxygen varies, so the breathing rate varies as does the heart rate. Average respiratory rates tend to fall into ranges according to the level of activity:
Resting: 5-7 liters per/min
Working Moderately: 25-30 liters per/min
Hard exercising: 100-150 liters per/min
Cancer of esophagus,
Rates of occurrence...
What Are The Regulations We Need To Follow?
Where does Asbestos Come From?
Order of Operations
IS A BUILDING DEMOLITION OR RENOVATION REQUIRED?
HAS A HAZMAT (ASBESTOS, LEAD, PCB’S, CHEMICALS ETC.) SURVEY BEEN COMPLETED AND DO YOU HAVE THE SURVEY?
YES NO (You need to do one!!)
YES NO (Safe to proceed)
ARE HAZARDOUS MATERIALS PRESENT?
THE MATERIAL MUST HAVE A RISK ASSESSMENT CONDUCTED ON IT THEN MUST BE REMOVED BY A QUALIFIED ABATEMENT CONTRACTOR PRIOR TO WORK STARING.
Exposure Control Plan
Before you can demolish (or renovate) equipment or structures you must:
Have conducted an inspection for asbestos, lead, or any other heavy metal, toxic, flammable or explosive materials
Have the inspection results available on site
Safely contain of remove the hazardous materials
If you discover any further materials that may be hazardous during demolition/renovation you must stop work until those materials can be contained or removed safely
Exposure Limits, the employer must implement an Exposure Control Plan (ECP)
The ECP must cover (minimally):
The responsibilities of employer, supervisors, and workers
Risk Identification, assessment, and control measures
Safe Work Procedures
Modified Moderate Risk
Low & Moderate Risk
Modified Moderate & High Risk
Involves working with or in close proximity to asbestos-containing materials
limited in that it only involves work that would not necessarily require the use of PPE
Activities other than High risk that involve working with asbestos while it is being disturbed (i.e. by cutting, sanding, drilling,etc)
Necessary to use PPE to protect workers
Modified Moderate Risk
As with Moderate Risk, however, also includes higher PPE and decontamination showers
Will never require greater protection than PAPR
Activities where most controls will be ineffective at managing the asbestos containing material and thus fibre concentrations will be very high
Full enclosures, high level PPE, and strict work procedures will be required
Removing Asbestos Containing Material
How to Protect Yourself
Asbestos Respirator Protection (Types)
solvents, thinners, varnishes
wood/lead dust, asbestos
HVAC Systems, laboratories
acid spill clean up
Organic vapour, acid gas, fumes
Organic vapour only
Dusts, particulate, aerosols
Respirator Cartridge Selection
Respirator Fit Testing
Three tests are commonly used to check the fit of a respirator :
Irritant Smoke Test (once a year)
Positive/Negative Pressure Test (every time you put it on)
Also called a "Seal Check"
Respirator Care & Maintenance
Respirators should be cleaned after each heavy use
Wipe inside and outside with an antiseptic wipe – an uncleaned respirator will smell terrible the next time it’s used
If heavy cleaning is needed, the respirator can be completely disassembled, then, washed with warm water and soap
Store your respirator in a bag with your name on it
All the parts of your respirator can be replaced by ordering bits from the manufacturer. Ensure that all the parts, especially the valves, are in place when you put on your mask
CSA-L1-Core1 Session 5
Health & Safety in construction & associated industries
Asbestos awareness session
What is it ?
Where is it found ?
What harm does it cause ?
Control / removal techniques/ regulations
Asbestos is the single greatest cause of work-related deaths in the UK
Resistance to alkaline attack makes chrysotile a useful reinforcing material in asbestos-cement building products.
Where is asbestos found?
The dangers of asbestos were largely ignored in the United Kingdom for many decades, until use of the mineral was finally banned in 1999.
55% of Britain's asbestos imports (Canada)
Latest stats (HSE)
There are three essential steps:
find out whether the premises contains asbestos, and, if so, where it is and what condition it is in. If in doubt, materials must be presumed to contain asbestos;
assess the risk; and
make a plan to manage that risk and act on it.
Control of Asbestos Regulations 2012
Law also states that work must be performed in accordance with the approved code of practice, and any plans for the removal of asbestos must be submitted to the HSE at least two weeks prior to the beginning of work.
Previous HSE campaigns
Carry out a check list/ report of possible locations for asbestos for the property you have been given ?
Complete the asbestos activity sheet