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Self Contained Breathing Apparatus
(Positive Pressure) Open Circuit SCBA
OSHA 29 CFR 1910.134
1998
What are the four hazardous respiratory environments?
• 1. Heat• 2. Smoke• 3. Toxic gases (poisonous &
superheated)• 4. Oxygen deficiency <19.5%
Smoke
• Byproduct of incomplete combustion
Toxic gases include:
•
Carbon Monoxide
• Hydrogen Sulfide
• Phosgene gases
Air consists of:
• 78% nitrogen• 21% oxygen• 1% other
When do we use SCBA?
• Oxygen deficient atmospheres / confined spaces.
• Gas incidents.• Chemical incidents.• Salvage and clean-up operations.• True unknowns.• Whenever in doubt.
S.C.B.A. can’t protect you from:
• Gases absorbed through skin• Intense heat• Empty air supply• Radiation
Stress can add to an improper fit.
Psychological Problems
• Hyperventilation
Physiological problems
• Claustrophobia
How much time do you have with the SCBA?
• It’s never enough, but you have about 30 minutes if:
• You’re in good cardiovascular health.
• Not stressed out.• Good fit on mask
Factors that affect fit of mask
• Weight gain/loss• Facial hair• Shape of face• Good seal
Safety Check
• Tank pressure• Low air alarm• High pressure line• Regulator• Mainline valve• Emergency by-pass valve
Safety Check cont.
• Low pressure hose• Damaged lens• Facepiece straps• Facepiece seal
Sounds easy, right?