BA Flashcards
At what pressure would a cylinder fail the general test on a interspiro BA set?
Below 270 bar
At what pressure will the relief valve on the regulator operate at?
12 - 20 bar
What is the correct composition of air on inhalation?
Nitrogen and rare gases = 79%
Oxygen = 21%
Define the term “tidal capacity” and state the volume?
Flow to and from the lungs under inactive conditions
1/2 litre
What is the average lung capacity of a human adult in litres?
5.5
List the 4 main parts of the respiratory tract
Trachea
Bronchiole
Biro chi
Alveoli
What is the maximum number of fire-fighters a stage 2 BA entry control supervisor can be responsible for?
12
List the occasions you would perform a general test on a BA set?
On drill night
On return from BA workshops
Collecting from holding area prior use or on the way to an incident
After an incident or training exercise
What is the purpose of the inner orinasal mask on the BA set?
To prevent the build up of Co2 in the mask
List 4 safety features incorporated into the DDU and BAC?
Automatic distress signalling unit
Back light
Pneumatic low pressure warning whistle
Electronic low pressure warning whistle
What is the maximum number of stage 2 BAEC boards a single BA sector command board can be responsible for?
4
What is the volume level of a sounding alarm on the interspiro BA set?
105db
How long should new batteries last on the BA set torch when it is used continuously?
6 hours
What is the length of the short personal line in metres?
1.25 metres
What is the overall length of a personal line
6 metres
When are stage 2 BA entry control procedures introduced?
When guidelines are in use
When the incident requires a higher degree of command and control
When there is 2 or more entry control points
When there is a need for more than 6 wearers
List 3 items of additional equipment provided with each interspiro BA set?
Torch
Tally
Cylinder cover
What is the approximate volume of air breathed by a person walking at 4mph whilst wearing a BA set in L/min?
50 L/min
How will you know when you have reached your TAP whilst wearing your interspiro BA set at an incident?
Screen on DDU will display TAP
A audible warning of 2 beeps will emit
Led lights will flash red on the DDU and BA set computer
List the 22 rules to be remembered by BA wearers?
Only wear BA on instruction of IC
Ensure effective fire fighting is used
Keep close contact with other wearers

Ensure correct PPE is worn correctly
Work as part of a team, sharing workload to maximise duration
If a BA set malfunctions, the wearer and the remained of the team must report to entry control
Check fire fighting equipment by operation before entering the risk area
Ensure an adequate seal is established in safe air
Check communication equipment at regular intervals
Approach entry control in full PPE holding DDU with key in
Carry out comm’s check prior to going under air
Always carry out safe movements and search and rescue techniques
When a DSU is sounded all wearers hearing it will proceed in the direction of the sound and render assistance
What voltage are the BA set cable cutters insulated to?
1000 volts AC
1500 volts DC
What is the minimum period between each face mask fit test?
Monthly
What is the harness made of?
Kevlar and coated in nomex
What is the minimum pressure you must have in your cylinder when reporting to entry control?
240 bar
