BA Flashcards
TWO TYPES OF BA
standard duration ( SDBA ) and extended duration ( EDBA)
what does acute mean
immediate risk of
injury if RPE removed
what does chronic mean
long term risk to health but not immediate risk of injury
what is the default RPE for fires and other acute respiratory risks
BA
what are only
used in non toxic oxygenated environments
Dual purpose face masks (DPFM) with P3 particulate filter cartridge
Air and BA is 21% oxygen, 0.04% CO2 and exhaled air is..
16% oxygen and 4% co2
what are some consumtion factors
1. Physical exertion 2. Physical fitness 3. Stress
Four ways body dissipates excess heat:
1) radiation - heat from hot to cold areas
2) convection- cooling by air currents over the body
3) vaporisation- blood is cooled in lungs by air
4) evaporation- sweat covers skin and evaporates
Age, weight, health and fitness effect how body responds to what
heat stress
how much fluid intake should you have
2 litres a day when wearing BA and half a litre
watching 30mins of strenuous BA use
Heat stress psychological symptoms:
1. Coordination 2. Manipulation 3. Visual skills 4. Reasoning
Heat stress physiological symptoms 2:
1.
Heat cramps (caused by salt loss in sweat)
2.
Heat exhaustion (thirst, fatigue, nausea, confusion)
3.
Heatstroke (medical emergency, stop swearing, unconscious, convulsions)
Minimising heat build up:
1. Rotating crews to reduce exposure 2. Recovery/holding area in shade 3. Drinking water available 4. Relaxing dress when in hol ding/recovery area 5. Radial cooling (hands, wrists, neck and head) 6. Avoid using BA crews for other hard jobs 7. LAS monitoring crews health
Breathing apparatus used by the LFB
Drager PSS 7000 Compressed Air
breathing apparatus set
Working duration of dragger pss 7000
31mins at 50lpm consumption rate
weight of dragger pss 700
15.5kg
what does STOPCAP mean
self contained two stage open circuit positive pressure compressed air breathing apparatus set
checks for ba set
positive pressure, first breath achieved, speech diaphragm, additional flow button, stable air supply with low breathing resistance
complete ba set
bodyguard key, tally, personal line, cable cutters, cylinder, cylinder cover and log book
what face mask is used
face protection system 7000 (fps)
standard issue size for mask?
M2
what is the face mask made from?
anti dermatitis rubber with double reflex seal
feauture of outert mask
five strap adjustable harness with neck strap,
Impact resistant polycarbonate visor with airtight seal
what does inner mask do?
prevent the build up of co2 and misting
how is air controlled in mask?
controlles from medium pressure supply hose to mask via first breath button
how is air drawn into main mask?
two ports inside visor
how is air drawn into the inner mask?
inhalation non return valves
how is air exhaled in mask?
exhaled air closes lung demand valve which cuts of air supply and pushes into outer atmosphere via spring loaded exhalation valve
why is it a dual purposes face mask? (dpfm)
can disconnect demand valve and replace it with cartridge to convert into respirator
what does lung demand valve do?
supplies air at a breathable pressure
feauture of lung demand valve?
has automatic first breath mechanism which allows for opening of cylinder without putting on mask
Additional flow button on centre of outer rubber casing
after first breath air flows through at a positive pressure what does this mean
inside of the mask has higher pressure than outside atmosphere preventing entrance of contaminated atmosphere
how many quick release couplings does ba set have?
BA set has one inline and one second person connection with quick rel
ease
couplings
what does the quick release couplings do?
allows wearer to supply or receive air in an emergency
what does the REDUCER do?
reduces cylinder pressure to breathable pressure
where do the 3 air hoses leade on the reducer?
1) high pressure hose to electronic management unit
2) medium pressure hose to LDV providing air to mask
3) medium pressure air hose to second person connection
what does the bodyguard 7000 do
gives visual indication of air remaining and time to warning device in minutes
feature of bodyguard 7000
monitor available air pressure time to warning display led and audible warnings visual LEDs motion sensor and autyomatic distress signal unit (ADSU) button activated distress signal low bat signal 10 second backlight from left hand button
what are the visual led on bodyguard 7000
operational mode,key removed
warning mode
telemetry signal
what happens after 30 seconds of non movement
pre alarm emits, if then move within 15 seconds it goes off
after furthert 15 seconds only inserting key will switch off alarm
what happens if the bodyguard 7000 drops below 5.5 volts?
display empty battery icon and beep every 9 seconds
how long can bodyguard 7000 last
2 hours
what does low pressure warning device do
audible warning that working duration has expired
what are stages of low pressure warning device?
below 84 bar, electronic warning device and led sound intermittently
below 74 bar pheunamitc whistle blows until air exhausted ( should last 12 minutes at 50lpm at this point)
what can body alarm be affected by?
high strength magnetic flux
whole BA SET
pss 7000 BA set Face mask FPS 7000 lung demand valve quick release couplings reducer bodyguard 7000 low pressure warning devices BA tally backplate telemetry module harness
what is BA tally used for
Used to record details of each wearer, tally is secured to bodyguard key
what colour are the tallys?
yello (SDBA) and red (EDBA)
what do the tallys contain?
1) role and name of wearer
2) cylinder pressure
3) actual entry time into risk area
In radiation risk, dosimeter reading can be recorded on reverse side of tally
what does backplate do?
attaches air cylinder to reducer
what is back plate made off?
carbon fibre composite
feature of backplate?
set height settings (SML) which forms part of A and B Test
Neoprene coated belt, designed to have set low on back to reduce shoulder strap burns
what Is PSS merlins telemetry module?
Battery powered unit with integral digital radio transmitter/receiver and
antenna
Audible and visual alarm signal data can be received/transmitted from the BA set to the Entry Control Board
harnsess use
Neoprene coated with place for p
ersonal line and pouch
