Presentation on theme: "BA SET DESCRIPTION Introduction Carbon composite cylinder Pressure regulator Primary, secondary & Breathing hoses Gauge & whistle manifold Face mask &"— Presentation transcript:
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.ADSU 2.Tally 3.Personal line 4.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 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 QUARTERLYS – not considered accurate as only in quarters
CYLINDER CONNECTOR CHROMIUM PLATED MARINE BRASS MALE THREAD SINTERED METAL FILTER ARRESTS PARTICLES DOWN TO MICRONS HIGH PRESSURE HOSE CONNECTION INCORPORATES 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
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
WHISTLE UNIT Chrome plated brass Operates between 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 assembly 2.Lever fork & rod 3.Positive pressure & diaphragm assembly 4.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 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 – m in free air BA duration timer – at 15 mins then every 5 mins Evacuation whistle – 3 blasts every 20 secs. Size – 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 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 Bar the pressure sensor will re-assert itself, opening the airway allowing air to pass.
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 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 Inhalation 1.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 wearers 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 breath 2.Check mask has a positive pressure 3.Pressure gauge shouldnt rise or fall more than 10 bar in 1 minute when cylinder valve turned off then on again 4.Warning whistle sounds at bar 5.Check and record cylinder contents 6.Check ancillary equipment 7.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