self contained breathing apparatus (positive pressure) open circuit scba

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?