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27 Cards in this Set
- Front
- Back
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Number one protection provided by SCBA mainly being
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respiratory protection from heat
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Oxygen deficiency % and s/s
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1) 21% oxygen in air=normal
2) 17% oxygen in air=increased respiration and muscular impairment 3) 12% oxygen in air=signs of hypoxia including dizziness, headache, fatigue 4) 9% oxygen in air=unconscious 5) 6% oxygen in air=death |
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FYI: Carbon monoxide (CO)
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1) being the largest killer with cumulative effect.
a. There are large concentrations of CO during overhaul. b. CO combines with hemoglobin 210 times faster than oxygen, and displaces oxygen in the blood. c. .05% concentrations kill d. Comes from carbon fuels. |
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FYI: Hydrogen chloride (HCL)
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a. Obstructs respiration and heat.
b. From carbon fuels. |
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FYI: Hydrogen cyanide (HCN)
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a. Stops absorption of oxygen.
b. From sulfur based fuels like wool, nylon, rubber, and paper. |
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FYI: Carbon dioxide (CO2)
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a. Kind of a dam if you do dam if you don't kind of thing cause it increases breathing rate.
b. 10 to 12% can cause death. |
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FYI: Nitrogen oxides
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a. Blocks respiratory process, with a delayed reaction.
1) NO2 is a pulmonary irritant forming acid when mix with water. 2) Blocks body's respiratory process. |
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FYI: Nitric oxide (NO)
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1) Soluble in water. Also can cause a delayed reaction.
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FYI: Phosgene (COCL2)
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a. Mixes with water to form acid.
b. Refrigerants that are burned. |
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FYI: Hydrogen sulfide (H2S)
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a. Forms from rubber, and plastics.
b. Forms sulfuric acid in the lungs. |
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Air cylinder may be constructed
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of steel, aluminum, or composite carbon
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Fill pressure and durations consist of:
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a. 2,216 psi: rated for 30 min see this one on the field often
b. 4,500 psi: rated for 30 min see this one on the field often c. 3,000 psi: rated for 45 min d. 4,500 psi: rated for 45 min e. 4,500 psi: rated for 30 min |
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Hydrostatic testing of cylinders required by DOT
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a. Steel cylinders every 5yrs
b. Aluminum (not including hood-wrapped) every 5yrs c. Hood-wrapped every 3yrs d. Fully wrapped fiberglass every 3yrs e. Carbon-wrapped every 5 yrs unless retested in the field than 3 yrs from that date and than 5 yrs after that. |
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Cylinder life for:
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a. Steel and aluminum is indefinitely unless damaged beyond repair
b. Hood-wrapped and composite (carbon fiber) is 15yrs. Composite may become indefinite in the future. |
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Regulator
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reduces air pressure and supplies air on demand keeping the facepiece pressurized. It has an emergency bypass valve (purge or red valve) which can bypass the regulator if it fails to deliver air.
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Remote pressure gauge
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which should be mounted within wearers vision displaying the psi left in the cylinder by the 100.
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"End-of-Service-Time Indicator" or low-pressure alarm
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design to alert user when 20% to 25% is left and must stimulate more than one human sense including whistle, flashing light, and vibration.
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Facepiece
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has an exhalation valve, lens, speaking diaphragm, head harness, and a heads-up display. ● The exhalation valve must be a one way valve which lets air out without allowing outside air in, and it also must be kept clean so that it works properly. ● The Heads up display is now require as of March, 2003 from manufactures. It is to display cylinder content and battery condition, and also displays a visual alert when the cylinder has reduced 50% of rated service content.
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Every SCBA coming from the manufacturer as of March 2003 is required to have a
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RIC rapid intervention crew universal air connection male fitting to allow replenishment of breathing air to the SCBA breathing air cylinder.
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Before Donning complete the Pre-donning check. Check the:
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● Straps (mask & unit) extended
● Pressure checked -tank should be full ● High pressure connection secure ● Tank secure in holder-valve off-air bled from high pressure line ● Regulator and pressure demand valve positioned correctly. |
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Donning the facepiece
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a. Must be tightly sealed to the wearer's face to prevent toxic gases from entering.
b. The nomex hood should not be between the skin and the facepiece seal. c. The chin should be centered in the chin cup of the facepiece and the harness pulled over the head. d. Facepiece straps should be pulled evenly and simultaneously to the rear not the front or side. e. The lower strap should be tighten first, than the temple straps and finally the top straps. |
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The procedures for cleaning and sanitizing SCBA
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using approved manufacture's procedures are to clean after every use. The face piece should be wash with warm water and mild detergent, and rinsed in clean warm water. Than sanitized in approve manufacture, than rinsed in warm water again. Than air dry or with lint free cloth. SOLVENTS never use to clean SCBA.
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The procedures for daily inspection and maintenance of SCBA include checking:
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a. All components for cleanliness and damage.
b. Check cylinder for adequate air pressure and the hydrostatic test date. c. Donn the SCBA to ensure all works properly remember to check each pressure gauge. Check bypass. d. Doff the SCBA and check for operation of the low pressure alarm when bleeding the SCBA. e. Return all straps, valves and components to ready state. |
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There are two ways to repositioning of SCBA for use in restricted passages
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One being Tank Shift and two being Tank Dump
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Tank Shift
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(repositioning SCBA in restricted areas)loosen all the straps and shift unit to left side
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Tank Dump
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(repositioning SCBA in restricted areas)loosen and unbuckle straps roll unit to the left side, removing right arm fire. Place unit on bottle with regulator toward face, gather straps on top. After clearing obstacle rotate unit 180 degrees and grasp shoulder near end and swing unit around to left side onto back and tighten straps.
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"skip breathing"
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Inhale normally, hold breath as long as it normally take to exhale and inhale again before exhaling.
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