Selecting rpe
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Transcript of Selecting rpe
Mike Slater
Respiratory Protection
RPE
Air purifying
Negative pressure
AerosolGas /
Vapour
Air assisted
AerosolGas /
Vapour
Air supplied
SCBA Compressed air fed Air hose
Air supplied – where an independent air supply is provided
RPE
Air purifying
Negative pressure
AerosolGas /
Vapour
Air assisted
AerosolGas /
Vapour
Air supplied
SCBA Compressed air fed Air hose
Air purifying – where the ambient air is passed through a filter
RPE
Air purifying
Negative pressure
AerosolGas /
Vapour
Air assisted
AerosolGas /
Vapour
Air supplied
SCBA Compressed air fed Air hose
Air purifying devices should NOT be used when
< 19% oxygen
Concentrations unknown
Concentration immediately dangerous to life and health
Respirator Selection
Equipmentperformance User
Task Other PPE
Selecting Respiratory Protection
1. Can sufficient oxygen be guaranteed?
Sufficient Oxygen?
Air purifying devices should not be used where the oxygen concentration is less than 19%
.
Sufficient Oxygen?
Where the oxygen concentration is less than 19% air supplied equipment will be needed.
Selecting Respiratory Protection
2. Identify the contaminants
The filter needed will depend on the what the containants are
Airborne Contaminants
Aerosol *
Dust Fume Mist
Gaseous
Vapour Gas
*Aerosols are particles suspended in the air
Filter Types (Europe)Substance Filter
TypeColour
Particulates P White
Organic gases & vapours (BP >65C) A Brown
Organic gases & vapours (BP <65C) AX Brown
Inorganic gases / vapours (but not carbon monoxide)
B Grey
Acid gases E Yellow
Ammonia K Green
Mercury Hg/P3 Red-white
Oxides of nitrogen NO/P3 Blue-white
Other specified substances SX Violet or
violet-white
With gas filters the filter class is really about how long the filter will last
They are not really about the concentration they will protect against
Respirator filter selection guides are available from suppliers such as
3Mshttp://multimedia.3m.com/mws/media/738488O/filters-for-reusable-respirators-selector.pdf
Scott Safetyhttps://www.scottsafety.com/en/emea/DocumentandMedia1/Pro2000_Brochure_English_72dpi.pdf
If the contaminant is a gasand
• It doesn’t have good warning properties
• Concentration > 10% of Occupational Exposure limit
air supplied equipment will be needed
Selecting Respiratory Protection
3. Determine the concentration of the contaminant(s)
Selecting Respiratory Protection
4. Identify acceptable concentration and determine Assigned Protection Factor (APF)
What is "acceptable” inside the respirator ?
Minimum APF = Ambient Airborne Concentration
Acceptable Exposure Conc.
APF – Assigned Protection Factor
“Acceptable exposure” will be the Occupational Exposure Limit (OEL) for the substance of concern
To ensure greater safety use a fraction of the OEL
Occupational Exposure Limits
Example
xyz dust Concentration 0.5 mg/m3
Exposure standard 0.1 mg/m3
Required minimum PF = 0.5 / 0.1 = 5
Half face piece respirator (P1, P2 or P3 filter)
Assigned Protection Factor (APF)
Based on protection achieved in real use
Applies to filter/facepiece combination
Assigned Protection Factor (APF)
Assumes:
correct fitting
good maintenance
Protection Factors are reduced by
incorrect fitting
contamination
poor maintenance
Selecting Respiratory Protection
5. Evaluate compatibility with
User
Task
Other PPE
Respirator Selection
Equipmentperformance User
Task Other PPE
RPE Selection - Human factors
Medical fitness
Face - shape and size
Facial hair
Spectacles
Comfort
RPE Selection - Task Factors
Physical effort
Length of time RPE to be worn
Mobility
Visibility
Communication
Confined Spaces
Compatibility with other PPE
Selecting Respiratory Protection1. Can sufficient oxygen be
guaranteed?
2. Identify contaminant
3. Determine contaminant concentration
4. Determine required APF
5. Assess compatibility with User
Task
Other PPE
Air purifying devices should only be used for gases and vapours if:
there is sufficient oxygen available
the gas has good warning properties
concentration is < 10 x OEL
Filtering Facepiece
APFs (Europe)
FFP1 = 4
FFP2 = 10
FFP3 = 20
Half Mask
APFs (Europe)
P1 = 4
P2 = 10
P3 = 20
Full Face Mask
Negative pressure Power assistedAPF up to 40 APF up to 40
Powered Full Face Mask
Powered Hoods and Visors
APF = 40
Air Supplied
Depending on design, APF = 40 to 2000
Source: 3M Australia Pty Limited – reproduced with permission
http://www.hse.gov.uk/pubns/books/hsg53.htm
Source: HSG53
Source: HSG53