Presentation on theme: "BA SET DESCRIPTION Introduction Carbon composite cylinder"— Presentation transcript:
1 BA SET DESCRIPTION Introduction Carbon composite cylinder Pressure regulatorPrimary, secondary & Breathing hosesGauge & whistle manifoldFace mask & breathing valveCarry frameHarnessAncillary equipmentADSUTallyPersonal lineTorchFlow of airStandard testsLog book
2 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 materialsThe 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
3 Standards & Guidance BS 4667 part 2 EN 137 Technical bulletin 1/97 OC notes 13/113/1/1 test procedures13/1/12 cylinders13/1/11 ADSU
4 CARBON COMPOSITE CYLINDER 1800 ltr air bar kgSeamless 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 - NomexInside coated with corrosion inhibitorPainted GREY with BLACK/WHITE shoulders Denoting BREATHABLE air
5 CARBON COMPOSITE CYLINDER (Cont.) LABELTest Pressure 310 barFilling Pressure 207 barWater capacity 9 LSerial numberWeight 3.9 kgThread ID M18Design life cycle 15 yrsAluminium alloy of liner AA 6061Specification HSC-AL-FW2Manufacturers markMark of approved inspection body
6 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
7 CYLINDER VALVE3 inch anti debris tube – Minimises risk of dust/small particles inside cylinder entering workings of cylinder valveM18 Parallel threaded connectionChromium plated marine brass3 turns to fully open hand wheel + black rubber coverSpring loaded ratchet to prevent accidental closure – 4 gland nutsDirect reading pressure gauge with POLYCARBONATE GLASS marked in QUARTERLY’S – not considered accurate as only in quarters
8 CYLINDER CONNECTOR CHROMIUM PLATED MARINE BRASS MALE THREAD SINTERED METAL FILTER ARRESTS PARTICLES DOWN TO MICRONSHIGH PRESSURE HOSE CONNECTION INCORPORATES LPM RESTRICTOR
9 PRESSURE REGULATOR Chromium plated marine brass Can deliver up to 1500 LPM – balanced piston type on knife edge sealDivided into PRIMARY / SECONDARY ChambersPressure relief valve operates between15-17 BARWorking pressure 7.5 BARStatic pressure 10.5 BAR
10 HOSES PRIMARY - HIGH PRESSURE w/p 300 bar, t/p 600 bar, b/p 1400 bar Construction :TEFLON INNERSTAINLESS STEEL BRAIDED OUTER SHEATHCOVERED IN HYTREL ANTI STATIC OUTER SHEATHSECONDARY - LOW PRESSURE BREATHING HOSEw/p 18 bar, t/p 36 bar , b/p 72 barConstruction :SPIRALLY WOUND FIBRE REINFORCEMENTCHEMICALLY BONDED WITH ANTI STATIC OUTER SHEATH.* Pin prick at end – Safety feature
11 WHISTLE UNIT Chrome plated brass Operates between bar when SAFETY MARGIN is reachedUses up to 5 lpm – normally no more than 2 lpm from cylinderMUST keep sounding down to zero90 db at 1 metre
12 HIGH PRESSURE GAUGE Gives direct pressure reading Calibrated in 10 bar segments up to 350 barBourdon tube principleShatterproof plastic coverBlow out disc on reverseProtected by rubber coverGauge needle markings are fluorescentBlack strip from 0-60 Bar
13 BREATHING HOSE Secondary hose leads to a ‘T’ piece Connection – female EURO COUPLINGQUICK COUPLING CONNECTORUsed to connect air lines during decontamination procedures
14 BREATHING VALVE Made of Reinforced plastic - Vistamid Positive pressure attachmentSupplementary air supplyBreathing Valve consists of:Valve cone & spring assemblyLever fork & rodPositive pressure & diaphragm assemblySupplementary air supply – 300 LPM
15 FACE MASK BS136 60% Natural rubber – NON DERMATITIC POLYCARBONATE VISOR FPC – IS REPLACEABLEINNER ORANASAL MASK with NON-RETURN VALVES to ELIMINATE DEAD SPACE – INHALED / EXHALED AIR WILL NEVER BE MIXED5 piece spider harness with stainless steel fixingsReflex seal with positive pressure in mask sealing against your face – wide sealing edge/inverted sealSPEECH DIAPHRAGM cover attached by 2 screws, fits over breathing valve PREVENTING breathing valve being removed
16 CARRY FRAME ‘Q’ BACKPLATE ANATOMICALLY DESIGNED MOULDED BACKPLATE TO DISTRIBUTE WEIGHT EVENLY ACROSS BACK AND HIPSMADE OF THERMO PLASTIC VISTAFLEXANTI STATIC COATINGCYLINDER STRAP ASSEMBLY WITH ‘OFF SET’ CAMCan be ‘Twinned’ – Red stitching
17 HARNESS CONSISTS OF 2 PIECES : SHOULDER STRAPS WAIST BELT NYLON WEBBING SHOULDER STRAPS WITH COMFORT PADSSTAINLESS STEEL BUCKLESADJUSTABLE HIP BELT ASSEMBLY
18 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 reasonManually operated evacuation and duration timerSpecial key used to turn on/offAny repairs carried out by Brigade BA technician or other designated personnel.Intrinsically safe
19 DSX 1000 MKII SPECIFICATION Frequency range 2.7Khz-3.0 KhzLocation flash – 1 flash every 1 second alternating sides and frontMovement monitor period – 30 SECONDSPre alarm – 10 80dbBattery – Duracell MN 1604 or as detailed on reverse of unitAuto rest indicator – Amber L.E.D. 1 sec flash on resetFull alarm sound – m in free airBA duration timer – at 15 mins then every 5 minsEvacuation whistle – 3 blasts every 20 secs.Size – x 87 x 39 mm, Weight 300 gLow battery indicator – 1 sec audio tone and red L.E.D. every 2 secs.
20 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
21 PERSONAL LINE6 m LongCARABENA 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 use4 mm No 2 plaited polyester
22 TORCH INTRINSICALLY SAFE – Wont create a spark in hazardous conditions Marked INTRINSICALLY SAFE on unitUsed to charge the PHOTO LUMINESCENT gaugeBatteries to be changed ONLY by trained technicianSpare bulb contained in unit
23 FLOW OF AIRAs 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.
24 PRESSURE REGULATORAir enters the regulator primary chamber from the cylinder connectionAir can then travel in 2 directions;1 – Through primary chamber and onto the gauge via the restrictor or2 – Through the central bore of the hollow piston and into the secondary chamber and then up to the breathing valve
25 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 BarWhilst 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.
26 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.
27 Warning whistle unitFitted 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
28 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 appliedSimple linkage at free end transmits it to pointer moving over suitably graduated dial.
30 Warning whistle unitAs 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.
31 Warning whistle unitThe 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.
32 BREATHING VALVEAir 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 springAutomatic pressure relief valve bar
33 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.
34 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.
35 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
36 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. RIDDOR3 main types of test in Bucks - ROUTINE,MONTHLY & ANNUALRoutine testsConsists of leakage/function tests+ visual checks for damage & wearCheck positive pressure switch opens on first breathCheck mask has a positive pressurePressure gauge shouldn’t rise or fall more than 10 bar in 1 minute when cylinder valve turned off then on againWarning whistle sounds at barCheck and record cylinder contentsCheck ancillary equipmentComplete log book
37 MONTHLY TESTSet subjected to periodic wear of not less than minimum wearing duration of 50 BarsHowever, 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 monthCylinders Physically examined every 6 months on station.
38 MONTHLY TEST SUFFICIENT AIRFLOW LOW EXHALATION RESISTANCE LEAKAGE TEST SEALING TESTAUTOMATIC POSITIVE PRESSURE OPERATIONRECORD ‘MINI TEST’ IN SET LOG BOOK
39 To be carried out by Workshops ONLY Notated in log book in red ink ANNUAL TESTTo be carried out by Workshops ONLYNotated in log book in red inkCylinders sent away every 3 years for inspection