Respiratory_Protection_7.ppt
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Transcript Respiratory_Protection_7.ppt
Outline
• Classroom
– Introduction
– Terminology
– Respirator Program
• Hands-on
– Cleaning
– Inspection
– Fit testing
Training Goals
• You should understand
the extent of the
requirements of a
respiratory protection
program.
• You should understand
the limitations of the
program and your
respirator.
Permissible Practices
• Engineering and administrative controls
before respirators.
• Engineering: substitution, minimization,
isolation, ventilation controls.
• Administrative: scheduling or rotation of work.
• Maintenance and Research are areas where
respirator use is still fairly common.
Exposure
• Exposure is
the
concentration
of air
contaminant
Exposure Assessment:
According to MSDS for
Hydrochloric Acid,
recommended Personal
Protective Equipment
should include:
– Chemical goggles or face
shield.
– Chemical resistant gloves.
– Clothing, to avoid skin
contact.
– Respiratory protection
based on airborne levels
of acid vapor.
Hydrochloric Acid
Exposure Assessment: Muriatic Acid
According to MSDS for
muriatic acid,
recommended personal
protective equipment
should include:
• Chemical goggles or face
shield and chemical
goggles.
• Chemical resistant gloves
• Coveralls, boots, or apron
to avoid skin contact.
• Respiratory protection
based on airborne levels of
contaminants.
Process Selection
• Physical Plant’s
respirator program
has a complete
“process selection”
chart in your
handouts
• Power Plant hasn’t
developed such a
tool yet.
• Other departments –
?
Exposure Acronyms
• PEL - Permissible
Exposure Limit
• TWA - Time Weighted
Average
• STEL - Short Term
Exposure Limit
• C - Ceiling Limit
• TLV - Threshold Limit
Value
• IDLH - Immediately
Dangerous to Life and
Health
• AL - Action Level
Explanation of Exposure Terms
Exposure Chart
Exposure Chart
Outside Contractor
Exposure Chart
Asbestos Exposure Limits
Types of Respirators: Fit
• Tight-fitting
• Loose-fitting
Tight fitting respirators
QuickLatch Respirator
• The only respirator with the easy on and off latching
system. Just flip the latch and the respirator slides
off the face. Close the latch and the respirator slides
back into its original fitting position.
Loose-fitting respirators
Classes of Respirators:
Positive and Negative Pressure
• Positive pressure
– The sandblasting helmet
system is a positive
pressure respirator
• Negative pressure
– North 7700 is a negative
pressure respirator
– Disposable masks
Positive Pressure Respirators
• When inhaling,
the pressure
inside the
respirator is
kept higher
than outside
the respirator
Examples: positive pressure respirators
• Powered air purifying
respirator
Examples: positive pressure respirators
Examples: positive pressure respirators
• Atmosphere supplying respirator
– Supplied air respirators
– Self-contained breathing apparatus
Examples: escape-only respirators
• Can not be
used for entry
Negative Pressure Respirators
• When inhaling, the pressure inside the
respirator is less than outside the respirator
Examples: negative pressure respirators
• Filtering facepieces or
Dust masks
Examples: negative pressure respirators
• Use for sensitizers like
allergens?
• Immunologic asthma
develops after a variable
period of time during
which "sensitization" to an
agent present in the
workplace takes place
• If sensitization occurs, it
may follow the first
exposure, or may not
occur until after exposure
has continued for a long
time.
Voluntary and Mandatory
• Dust masks are
being used for
protection against
biological agents
such as Anthrax
• Voluntary Use
– One page OSHA
mandatory “Voluntary
Use” form required
• Mandatory use of
dust masks kick in
the full respirator
requirements
Examples: negative pressure respirators
• Air-purifying respirator
– North 7700
Negative Pressure Respirators: filters
• Color coded
• Made specific for a
single manufacturers
line of respirators
Filters used against dust: HEPA
• High Efficiency Particulate
Air (magenta ???)
• HEPA-only or combination
filter
• Pancake
Filters used against vapors:
Cartridges or Canisters
• Cartridges are the
most common type.
–
–
–
–
OV (black)
OV/AG (bl/yellow)
OV/HEPA
OV/AG/pancake
HEPA
Filters used against vapors: Cartridges or
Canisters
• Photo
from
cover of
Chronicle
of Higher
Education
Respirators in the News
• Soldiers
prepared
for
chemical
warfare
during
Gulf War
(photo from
Science
magazine,
Feb. 2001)
Service Life
• End of service life indicators
– mercury
• Service life calculations
Factors that can Reduce Cartridge
Service Life
•
•
•
•
•
Exertion Level
Cartridge Variability
Temperature
Humidity
Multiple Contaminants
Cartridge Service Life Estimates
Fit factors
• We’ll talk about this at the end, if time
permits.
Particulate
Respirator
Combination
Respirator
Gas & Vapor
Respirator
Latex Allergy
• Latex allergy can result from repeated exposures
to proteins in natural rubber latex. Exposure can be
due to skin contact with a latex-containing item or
inhalation of the proteins. Reactions can range from
skin rash to anaphylaxis and shock. Some items that
include latex are gloves, medical supplies,
respirators, rubber bands, balloons, and baby bottle
nipples.
• Respirators are available in rubber and silicone. The
silicone masks can be used by those with latex
sensitivities