## How To Calculate Air Compressor CfmAcaca protocol ACACA PROTOCOL 2000(AS AT 31st MARCH, 2002)ACACA PROTOCOL 2000 INCLUDES (A) CODE OF PRACTICE FORMANUFACTURERS AND/OR SUPPLIERS OF COMMERCIAL AIRCOMPRESSORS AND METHOD FOR DETERMINING (B) RECIPROCATINGAIR COMPRESSOR PUMP DISPLACEMENT (C) FREE AIR DELIVERY OFAN AIR COMPRESSOR PACKAGE WITH A PUMP DISPLACEMENT OF UPTO 600 LITRE/MINUTE AND (D) TEST REPORT.Table of ContentsA.Code of PracticePage 2B.Pump DisplacementPage 2C.Free Air Delivery (FAD) of Air CompressorPage 3(i) Pump Up Test (Simplified Method)Page 3 (ii) General Pump Up FormulaPage 4 (iii) Specific ACACA Pump Up Test MethodPage 4 (iv) Calculation of FADPage 4 (v) Protocol 2000 FAD Standard Testing ProcedurePage 5D.Test Report RecordPage 7A.CODE OF PRACTICEMembers of the Australian Commercial Air Compressor Association agree to :i) Actively promote the aims and objectives of ACACA in the market, andii) To manufacture and/or supply air compressors which are safe to useiii) Where regulations so require, to apply the relevant Australian Standardiv) Act in accordance with ACACA Protocol 2000 when calculating thev) To affix the approved ACACA Protocol 2000 label on each and everya)Each ACACA label shall show both Pump Displacement (PD)b) each member may choose to show PD and FAD in litres/min oralso shall be shown in litres/min.vi)To encourage other manufacturers, assemblers, and importers to joinB.PUMP DISPLACEMENT1.Cylinder Bore Diameter measured in mm2.Cylinder Bore Area [= (Bore diameter)_ ] 43.Length of piston movement (Stroke) measured in mm4.Number of pistons or cylinders5.Rotational speed of pump shaft which shall be determined by the speedThe calculation requires the area of the cylinder bore to be multiplied by thepiston stroke, this give cylinder volume or capacity. This is then multiplied by3PD(litres/min) = Bore Area (mm_) x Stroke (mm) x No. of cylinders x pump speed (rpm) 1,000,000.Conversion Factorsb)To convert litres/min to litres/sec divide by 60.c)To convert litres/min to cubic feet/min (cfm) divide by 28.3.Bore diameter (d)=60mm (Bore Area = Stroke length=40mmSpeed of pump shaft=933rpm as measured by a tachometerNumber of cylinders=2(46060xxxxx= 211 litres/min (rounded to nearest litre)PD (cfm) = 211 28.3 = 7.5 cfm (rounded to nearest 0.1)C
.FREE AIR DELIVERY (FAD) OF AIR COMPRESSOR PACKAGEa)FAD is the volume flow rate of air (measured at ambient pressure andb) Pump Up Test (Simplified Method)i)The pump up test consists of operating a compressor at a constant speed and observing the time required to increase the kPa(g) to 800 kPa(g) ie when the compressor is operating ii) General Pump Up FormulaTo estimate the average free air delivered by the compressorduring the pump up pressure change the following formula maychanges throughout the systemTPPPV)(012=WhereFAD is the average volume of air delivered by the compressor And where Piii) Specific ACACA Pump Up Test Methodpressure in the air receiver to increase from 600 kPa to 800 kPa(or 6 Bar to 8 Bar).This recognises that as the pressure builds2000
FAD Standard Test Procedure refer (v) below.(iv)Calculation of FADUsing the general formula (refer (ii) above)TPPPV)(012=Then FAD= the nearest 0.2 litre.pressure of air in the receiver to increase from 600 kPa to 800 kPa. Thencrease from 600 kPa to 800 kPa (6 Bar to 8 Bar).FAD (litres/minute) = 2V (twice the volume of receiver - litres)ExampleV = 54 litresThenFAD = 2 x 54 To convert from litres/min to CFM divide by 28.3(v)Protocol 2000 - FAD Standard Testing Procedurea) Measure the volume of the air receiver tank by filling the air receiveraccuracy of 0.4%.For example, for a nominal 50 litre air receiverb) Ensure stable 240 volt supply to compressor package under test.If(a) outlet valve of compressor package using no more than 1 metre of(b) Plug in Test Box to 240 volt supply.a)With compressor at operating temperature and air receiverb)Timer will activate when pressure reaches 600 kPa and stopc)Read off time and record it.Record time to nearest 0.01 second.d)Press reset button to zero timer for next test.e)IMPORTANT: bleed all pressure in unit back to zero kPa. Iff)Do not remove connection tube between compressor and testg)Repeat procedure 3 times and record the test results on ACACAh)Testing must be completed within twenty minutes after thei)After the results of 3 tests have been recorded, take the averagej)Round the results as follows:-i)CFM should be rounded to the nearest 0.1 CFM eg.9.15ii)litres/min should be rounded to the nearest litre eg.282.5 litres/min to under 283 is rounded up to 283, and. Caaa protocol Press reset button to zero timer for next test.e)IMPORTANT: bleed all pressure in unit back to zero kPa.If pressure isnot bled back to zero the timer WILL NOT ACTIVATE on your next test.Red OUT1 LED must be off for the next test to proceed.f)Do not remove connection tube between compressor and test box untilall testing for unit is completed.Drain residual air via another port(bleed valve).g)Repeat procedure 3 times and record the test results on CAAA Protocol2000 Test Report.h)Testing must be completed within twenty minutes after the Compressorhas reached normal operating temperature.i)After the results of 3 tests have been recorded, take the average andcalculate FAD of compressor package in accordance with the CAAAProtocol 2000 formula.j)Round the results as follows:-i)CFM should be rounded to the nearest 0.1 CFM eg.9.15 tounder 9.2 should be rounded up to 9.2, and between 9.10 and. |

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