BA SET DESCRIPTION

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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
• ADSU
• Tally
• Personal line
• Torch
• Flow of air
• Standard tests
• Log book

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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

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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

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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

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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

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CYLINDER (cont.)

• Charged with 1800 L air at 207 bar
• FULL DURATION 45 MINS _at_ 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

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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 QUARTERLYS not considered
  accurate as only in quarters

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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

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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

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HOSES

• PRIMARY - HIGH PRESSURE w/p 300 bar, t/p 600
  bar, b/p 1400 bar
• Construction
• TEFLON INNER
• STAINLESS STEEL BRAIDED OUTER SHEATH
• COVERED 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 INNER
• SPIRALLY WOUND FIBRE REINFORCEMENT
• CHEMICALLY BONDED WITH ANTI STATIC OUTER SHEATH.
• Pin prick at end Safety feature

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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

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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

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BREATHING HOSE

• Secondary hose leads to a T piece
• Connection female EURO COUPLING
• QUICK COUPLING CONNECTOR
• Used to connect air lines during decontamination
  procedures

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BREATHING VALVE

• Made of Reinforced plastic - Vistamid
• Positive pressure attachment
• Supplementary air supply
• Breathing Valve consists of
• Valve cone spring assembly
• Lever fork rod
• Positive pressure diaphragm assembly
• Supplementary air supply 300 LPM

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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

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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

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HARNESS

• CONSISTS OF 2 PIECES
• SHOULDER STRAPS
• WAIST BELT
• NYLON WEBBING SHOULDER STRAPS WITH COMFORT PADS
• STAINLESS STEEL BUCKLES
• ADJUSTABLE HIP BELT ASSEMBLY

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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

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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 _at_ 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 _at_ 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.

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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

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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

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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

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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.

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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

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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.

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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.

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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

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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.

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Cut away view of warning whistle
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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.

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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.

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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

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BREATHING VALVE Inhalation

• Wearer inhales and a reduction of pressure occurs
  in the diaphragm assembly, allowing the positive
  pressure spring to push the diaphragm assembly
  forward.
• The assembly now comes into contact with the
  lever fork and the lever fork pivots, pulling on
  the rod.

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BREATHING VALVE Inhalation

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

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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
  wearers exhaled breath to escape from the valve

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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
• Check positive pressure switch opens on first
  breath
• Check mask has a positive pressure
• Pressure gauge shouldnt rise or fall more than
  10 bar in 1 minute when cylinder valve turned off
  then on again
• Warning whistle sounds at 50-60 bar
• Check and record cylinder contents
• Check ancillary equipment
• Complete log book

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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.

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MONTHLY TEST

• SUFFICIENT AIRFLOW
• LOW EXHALATION RESISTANCE
• LEAKAGE TEST
• SEALING TEST
• AUTOMATIC POSITIVE PRESSURE OPERATION
• RECORD MINI TEST IN SET LOG BOOK

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ANNUAL TEST

• To be carried out by Workshops ONLY
• Notated in log book in red ink
• Cylinders sent away every 3 years for inspection

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• The end