BA SET DESCRIPTION Introduction Carbon composite cylinder Pressure regulator Primary, secondary & Breathing hoses Gauge & whistle manifold Face mask &

BA SET DESCRIPTION

• Introduction• Carbon composite cylinder• Pressure regulator• Primary, secondary & Breathing hoses• Gauge & whistle manifold• Face mask & breathing valve• Carry frame• Harness• Ancillary equipment

1. ADSU2. Tally3. Personal line4. Torch

• Flow of air• Standard tests• Log book

Design and use – Interspiro Spiromatic 90QS CABA set

• Its designed to enable the wearer to breath and work in atmospheres which would otherwise be irrespirable or hazardous to health.

• Can be used in conjunction with a chemical protection suit to give added protection when dealing with hazardous materials

• The set itself is a lung governed, self contained, open circuit type set which delivers cool air to the wearer in accordance with their requirements. This simply means the air flow is controlled by the wearer as he or she breathes in and out.

• Air which is breathed out is exhaled to the atmosphere not returning into the circuit.

• Defined as ‘ medium duration ‘ set

Standards & Guidance

• BS 4667 part 2

• EN 137

• Technical bulletin 1/97

• OC notes 13/1

• 13/1/1 test procedures

• 13/1/12 cylinders

• 13/1/11 ADSU

CARBON COMPOSITE CYLINDER

• 1800 ltr air 200 bar 3.9kg• Seamless aluminium liner around with EPOXY

RESIN IMPREGNATED CARBON FIBRES wound spirally to give approx 90% of its strength over this a layer of RESIN IMPREGNATED GLASS FIBRE + Carry case - Nomex

• Inside coated with corrosion inhibitor• Painted GREY with BLACK/WHITE shoulders

Denoting BREATHABLE air

CARBON COMPOSITE CYLINDER (Cont.)

LABEL

• Test Pressure 310 bar• Filling Pressure 207 bar• Water capacity 9 L• Serial number• Weight 3.9 kg • Thread ID M18 • Design life cycle 15 yrs • Aluminium alloy of liner AA 6061• Specification HSC-AL-FW2• Manufacturers mark • Mark of approved inspection body

CYLINDER (cont.)

Charged with 1800 L air at 207 bar

FULL DURATION 45 MINS @ av. rate of 40 L Min. SAFETY MEASURE – Working duration LIMITED to 35 mins. Leaving safety margin of 10 mins.

Difficult / strenuous operations will use more air, quicker

CYLINDER VALVE

• 3 inch anti debris tube – Minimises risk of dust/small particles inside cylinder entering workings of cylinder valve

• M18 Parallel threaded connection• Chromium plated marine brass• 3 turns to fully open hand wheel + black rubber cover• Spring loaded ratchet to prevent accidental closure – 4

gland nuts• Direct reading pressure gauge with POLYCARBONATE

GLASS marked in QUARTERLY’S – not considered accurate as only in quarters

CYLINDER CONNECTOR

• CHROMIUM PLATED MARINE BRASS

• MALE THREAD

• SINTERED METAL FILTER ARRESTS PARTICLES DOWN TO 50-60 MICRONS

• HIGH PRESSURE HOSE CONNECTION INCORPORATES 20-32 LPM RESTRICTOR

PRESSURE REGULATOR

• Chromium plated marine brass

• Can deliver up to 1500 LPM – balanced piston type on knife edge seal

• Divided into PRIMARY / SECONDARY Chambers

• Pressure relief valve operates between15-17 BAR

• Working pressure 7.5 BAR

• Static pressure 10.5 BAR

HOSESPRIMARY - HIGH PRESSURE w/p 300 bar, t/p 600 bar, b/p 1400 barConstruction :TEFLON INNERSTAINLESS STEEL BRAIDED OUTER SHEATHCOVERED IN HYTREL ANTI STATIC OUTER SHEATH

SECONDARY - LOW PRESSURE BREATHING HOSE w/p 18 bar, t/p 36 bar , b/p 72 bar

Construction :TEFLON INNERSPIRALLY WOUND FIBRE REINFORCEMENTCHEMICALLY BONDED WITH ANTI STATIC OUTER SHEATH.

* Pin prick at end – Safety feature

WHISTLE UNIT

• Chrome plated brass• Operates between 50-60

bar when SAFETY MARGIN is reached

• Uses up to 5 lpm – normally no more than 2 lpm from cylinder

• MUST keep sounding down to zero

• 90 db at 1 metre

HIGH PRESSURE GAUGE

• Gives direct pressure reading

• Calibrated in 10 bar segments up to 350 bar

• Bourdon tube principle• Shatterproof plastic cover• Blow out disc on reverse• Protected by rubber cover• Gauge needle markings

are fluorescent• Black strip from 0-60 Bar

BREATHING HOSE

Secondary hose leads to a ‘T’ piece

Connection – female EURO COUPLING

QUICK COUPLING CONNECTOR

Used to connect air lines during decontamination procedures

BREATHING VALVE

• Made of Reinforced plastic - Vistamid• Positive pressure attachment• Supplementary air supply

Breathing Valve consists of: 1. Valve cone & spring assembly2. Lever fork & rod3. Positive pressure & diaphragm assembly4. Supplementary air supply – 300 LPM

FACE MASK BS136• 60% Natural rubber – NON DERMATITIC• POLYCARBONATE VISOR FPC – IS REPLACEABLE• INNER ORANASAL MASK with NON-RETURN VALVES

to ELIMINATE DEAD SPACE – INHALED / EXHALED AIR WILL NEVER BE MIXED

• 5 piece spider harness with stainless steel fixings• Reflex seal with positive pressure in mask sealing

against your face – wide sealing edge/inverted seal• SPEECH DIAPHRAGM cover attached by 2 screws, fits

over breathing valve PREVENTING breathing valve being removed

CARRY FRAME

• ‘Q’ BACKPLATE• ANATOMICALLY DESIGNED MOULDED

BACKPLATE TO DISTRIBUTE WEIGHT EVENLY ACROSS BACK AND HIPS

• MADE OF THERMO PLASTIC VISTAFLEX• ANTI STATIC COATING• CYLINDER STRAP ASSEMBLY WITH ‘OFF

SET’ CAM• Can be ‘Twinned’ – Red stitching

HARNESS

• CONSISTS OF 2 PIECES :

1. SHOULDER STRAPS

2. WAIST BELT

• NYLON WEBBING SHOULDER STRAPS WITH COMFORT PADS

• STAINLESS STEEL BUCKLES

• ADJUSTABLE HIP BELT ASSEMBLY

ANCILLARY EQUIPMENT

ADSU• DSX 1000 MKII DISTRESS SIGNAL UNIT• Can be AUTOMATICALLY or MANUALLY

Operated to give AUDIBLE WARNING if wearer becomes DISTRESSED for any reason

• Manually operated evacuation and duration timer

• Special key used to turn on/off• Any repairs carried out by Brigade BA technician

or other designated personnel.• Intrinsically safe

DSX 1000 MKII SPECIFICATION

• Frequency range 2.7Khz-3.0 Khz• Location flash – 1 flash every 1 second alternating sides and front• Movement monitor period – 30 SECONDS• Pre alarm – 10 Secs @ 80db• Battery – Duracell MN 1604 or as detailed on reverse of unit• Auto rest indicator – Amber L.E.D. 1 sec flash on reset• Full alarm sound – 90-96 db @ 2 m in free air• BA duration timer – at 15 mins then every 5 mins• Evacuation whistle – 3 blasts every 20 secs.• Size – 119.5 x 87 x 39 mm, Weight 300 g• Low battery indicator – 1 sec audio tone and red L.E.D. every 2

secs.

BA TALLY

• YELLOW COLOUR – OPEN CIRCUIT

• CONTAINS SAFETY CRITICAL INFO SUCH AS WEARERS NAME, RANK, BRIGADE NUMBER, BA SET NUMBER, STATION, CYLINDER PRESSURE, CAPACITY AND DOSIMETER READINGS ON BACK

PERSONAL LINE

• 6 m Long

• CARABENA on one end secured to set at the other end - belt

• ‘D’ Ring attached with TENNEX clip 1.25 m from running end to allow use of short personal line when guidelines in use

• 4 mm No 2 plaited polyester

TORCH

• INTRINSICALLY SAFE – Wont create a spark in hazardous conditions

• Marked INTRINSICALLY SAFE on unit

• Used to charge the PHOTO LUMINESCENT gauge

• Batteries to be changed ONLY by trained technician

• Spare bulb contained in unit

FLOW OF AIR• As the hand wheel is

turned the valve stem is also turned- this in turn opens the valve slug.

• Air enters from the cylinder into the valve through the debris tube.

• From here the air moves through the outlet tubes of the cylinder valve and out through the regulator connection and into the regulator unit.

PRESSURE REGULATOR

• Air enters the regulator primary chamber from the cylinder connection

• Air can then travel in 2 directions;

• 1 – Through primary chamber and onto the gauge via the restrictor or

• 2 – Through the central bore of the hollow piston and into the secondary chamber and then up to the breathing valve

Pressure regulator cont.• With the action of the air

changing direction and expanding into the larger secondary chamber the pressure reduces to the dynamic working pressure of 7.5 Bar

• Whilst air is not being used, a back pressure builds up in the secondary chamber.

• This acts against the face of the piston forcing it back down on the knife edge seal overcoming the pressure of the spring at 10.5 Bar.

Pressure regulator cont.

• As the air is used, the back pressure decays, the secondary spring asserts itself, lifting the piston from the valve thus allowing the cycle to be repeated.

• In the side of the regulator a spring loaded relief valve is fitted. Its purpose being to protect the low pressure hose if the main valve is open and the breathing valve is disconnected from the manifold. The relief valve will operate between 15-17 Bar.

Warning whistle unit

• Fitted to the pressure gauge manifold block situated on the left shoulder close to the ear and operates at between 60 and 50 Bar.

• Air consumption is up to but not exceeding 5 l/min.

• Operates by means of a system of pistons and springs.

• Bourdon tube style gauge

Bourdon tube gauge

• Made of Phosphor bronze.• Consists of tube, oval in

section, sealed at one end formed in shape of the greater part of the circumference of a circle. When pressure applied internally tube straightens – when air exhausted tends to curl up.

• Amount of curvature approx. proportional to pressure or vacuum applied

• Simple linkage at free end transmits it to pointer moving over suitably graduated dial.

Cut away view of warning whistle

Warning whistle unit

• As the cylinder valve is opened the whistle sounds momentarily until the spring on the pressure sensor piston is overcome and the airway is closed.

• When the cylinder contents reach between 60-50 Bar the pressure sensor will re-assert itself, opening the airway allowing air to pass.

Warning whistle unit

• The back pressure is built up between the whistle nozzle and the head of the regulating piston which cause the 2 pistons to work together to regulate the flow of air.

• When the cylinder is fully exhausted both pistons will have travelled to their fullest extent.

BREATHING VALVE

• Air from the gauge manifold flows through the breathing hose to the breathing valve.

• The flow of air is now held in check as a result of the valve cone being pushed onto the the valve inlet by means of a spring

• Automatic pressure relief valve 12-17 bar

BREATHING VALVE Inhalation

1. Wearer inhales and a reduction of pressure occurs in the diaphragm assembly, allowing the positive pressure spring to push the diaphragm assembly forward.

2. The assembly now comes into contact with the lever fork and the lever fork pivots, pulling on the rod.

BREATHING VALVE Inhalation1. The rod is connected to the

sealing piston assembly which now lifts the valve cone off the inlet allowing air to flow into the mask.

2. Air flows up through the demister ports over the inside of the visor, preventing any condensation forming and on through the non-return valves into the inner oranasal mask and into the wearers lungs.

3. The only outlets from the mask are the wearers lungs and the exhalation valve in the diaphragm assembly.

BREATHING VALVE Exhalation

• Wearer now exhales increasing the pressure of the diaphragm assembly.

• This has already been extended as far as it can by the positive pressure.

• The exhalation valve opens putting pressure on the sealing disc which opens allowing the wearer’s exhaled breath to escape from the valve

STANDARD TESTS• …..ensure that the set is functioning properly• If set fails any, then its made defective and taken off the run-

Impounded/Distress to wearer procedure Appendix 6 OC 13/1. RIDDOR• 3 main types of test in Bucks - ROUTINE,MONTHLY & ANNUAL

Routine tests• Consists of leakage/function tests+ visual checks for damage & wear

1. Check positive pressure switch opens on first breath2. Check mask has a positive pressure3. Pressure gauge shouldn’t rise or fall more than 10 bar in 1 minute when

cylinder valve turned off then on again4. Warning whistle sounds at 50-60 bar5. Check and record cylinder contents6. Check ancillary equipment7. Complete log book

MONTHLY TEST

• Set subjected to periodic wear of not less than minimum wearing duration of 50 Bars

• However, if set has been worn for drill or incident for at least 50 bars then an asterisk should be entered in column 4 ( OTHER TEST ) in log book, to indicate that the ‘WEAR DOWN’ test will not be required for that month

• Cylinders Physically examined every 6 months on station.

MONTHLY TEST

1. SUFFICIENT AIRFLOW

2. LOW EXHALATION RESISTANCE

3. LEAKAGE TEST

4. SEALING TEST

5. AUTOMATIC POSITIVE PRESSURE OPERATION

• RECORD ‘MINI TEST’ IN SET LOG BOOK

ANNUAL TEST

• To be carried out by Workshops ONLY

• Notated in log book in red ink

• Cylinders sent away every 3 years for inspection

The end