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Portable Air After Sales Market Department Basic compressor knowledge.
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Transcript of Portable Air After Sales Market Department Basic compressor knowledge.
![Page 1: Portable Air After Sales Market Department Basic compressor knowledge.](https://reader035.fdocuments.us/reader035/viewer/2022062805/5697bfae1a28abf838c9ca51/html5/thumbnails/1.jpg)
Portable Air After Sales Market Department
Basic compressor knowledge
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Portable Air After Sales Market Department
Effective Absolute pressure
atmosphericpressure
absolutepressure
effectivepressure
total pressure
pressure = 0
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Portable Air After Sales Market Department
Absolute pressure8 bar (118 psi)
Atmospheric pressure 1 bar (15 psi)
Effective pressure7 bar (103 psi)
Effective pressure
• The effective pressure is the difference between absolute pressure and atmospheric pressure
• It is the pressure available to deliver work
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Portable Air After Sales Market Department
Effective pressure
• XRVS 455 Md : receiver pressure during unload is 27 bar (397 psi)
• Forces on the air receiver cover (0.08 m²) is more then 22,000 kgf (about 48k pounds)
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Portable Air After Sales Market Department
Free Air Delivery
• Free Air Delivery :is the measured “real” delivered volume of air (in l/s or m³/min or cfm) at the same conditions of pressure and temperature at the air inlet
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Portable Air After Sales Market Department
Free Air Delivery
• FAD is not equal to the displacement volume of the compressor element, because internal losses in the element (leaks to air inlet)
• FAD is independent from the ambient conditions (temperature & pressure)
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Portable Air After Sales Market Department
Screw Compressor
• Introduced in 1958 by Atlas Copco
• Male and female rotors move towards each other, while the volume between them and the housing decreases.
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Portable Air After Sales Market Department
Screw Compressor
• Screw profile improved in 1966
• Symmetrical screw was changed to an asymmetrical helical profile
• 10% more efficiency
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Portable Air After Sales Market Department
Compression principle
Com
pres
sion
sta
rt
Com
pres
sion
Suc
tion
Del
iver
y
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Portable Air After Sales Market Department
Pressure Ratio
• Each screw element has a fixed, integrated pressure ratio
• This depends on :– length of the rotors– Pitch of the screw– form of the discharge port
• Best efficiency is reached when the pressure ratio is adapted to the required working pressure
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Portable Air After Sales Market Department
Screw Compressor Design Advantages
• High shaft speeds and large flow rate :– gives small exterior dimensions
• Simple and strong design :– no valves and seals reliable and maintenance
friendly– small dirt particles improve the sealing and the
efficiency– almost pulsation free air
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Portable Air After Sales Market Department
Screw Compressor Design Advantages
• Low wear :– guaranteed long life time and constant capacity– life time is determined by the bearing wear
• Absolute oil free design possible
• No inertia forces– vibration free operation– high speeds possible– big power possible
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Portable Air After Sales Market Department
Screw Compressor Design Disadvantages
• Lower efficiency because of internal leaks• High quality bearings on the rotors required
– rotor clearances are small – axial bearings needed
• Noise level (high frequency)• High quality finishing of the rotors required
– expansion of rotors through heat results in blocked elements
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Portable Air After Sales Market Department
Oil injected screw compressors
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Portable Air After Sales Market Department
Oil injected screw compressors
• Oil is used for :– Cooling : compression heat is absorbed by the oil– Lubrication of rotors, bearings, gears– Sealing between rotors and rotor and housing– Corrosion protection of the internal metal parts
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Portable Air After Sales Market Department
Oil injected screw compressors
Oil is injected in the bottom of the rotor housing, onto thebearings and gears, and discharged with the compressed air
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Portable Air After Sales Market Department
Oil injected screw compressors
• Only one rotor is driven, this rotor then drives the other one :– old XAS 90 : female driven rotor– all other compressors : male driven rotor
• When required a gear box or drive belt brings the compressor element to the correct speed
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Portable Air After Sales Market Department
Compressor running condition
• Four major running conditions :– NO-LOAD
Machine started, minimal pressure build-up– LOAD
Receiver tank pressurized and air consumption– UNLOAD
Receiver tank pressurized, no air consumption– BLOW-DOWN
Machine stopped, blow-off of air pressure
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Portable Air After Sales Market Department
• Air filter Compressor Element (AFCE) (with
vacuator valve VV, Safety Cartridge SC and vacuum indicator VI)
• Unloading Valve (UV)
• Compressor Element (CE)
• Temperature Switch (TS)
• Check Valve (CV)
• Air Receiver (AR)
• Non Return Valve• Minimum Pressure Valve (MPV)
• Air Outlet Valve (AOV)
Air system
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Portable Air After Sales Market Department
Air filter
• Filtration of the inlet air in 3 stages :– centrifugal dust separation– paper filter element– safety cartridge (optional)
• Vacuum indicator gives an indication when the pressure drop over the filter element is too high filter element needs to be replaced
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Portable Air After Sales Market Department
Air filter
Air inlet Centrifugal separation
Dust
Filter element
to compressor element
Vacuum indicator
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Portable Air After Sales Market Department
Unloading valve
• Opens and closes the air inlet to the compressor element.– Open position at load condition
=> Air consumption– Closed position at no load condition
=> No air consumption.
• Control of the valve by regulating pressure.
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Portable Air After Sales Market Department
Unloading valve
Valve
Spring loaded
Regulating pressure Air inlet
Integrated blow-down valve
Vent Hole
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Portable Air After Sales Market Department
Unloading valveLOAD UNLOAD
Reg
ulat
ing
pres
sure
Air inlet
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Portable Air After Sales Market Department
Check valve
• Check valve is integrated in the unloader for Series 6 compressors (XAS 185, 375, 400)
• Closes when the compressor is stopped.
• The air receiver is pressurized, which would result in a reverse air flow. the check valve prevents this.
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Portable Air After Sales Market Department
Check valveLOAD BLOW-DOWN
Receiver pressure return after shut-down
Check valve
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Portable Air After Sales Market Department
Air receiver / Separator
Air/Oil
Centrifugal separation
Separator element
Air outlet
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Portable Air After Sales Market Department
Minimum pressure valve / nozzle
• Guarantees a minimum pressure in the oil separator (approx. 45-60 psi)
• Minimum pressure is required to guarantee an continuous oil supply to the element.
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Portable Air After Sales Market Department
Nozzle / Minimum pressure valveMINIMUM PRESSURE VALVE
NOZZLE
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Portable Air After Sales Market Department
Oil system
• Air receiver
• Oil cooler
• Oil filter
• Oil stop valve (where used)
• Compressor element
• Oil separator
• Scavenge line
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Portable Air After Sales Market Department
Oil system (without TBV)
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Portable Air After Sales Market Department
Oil System (with TBV)
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Portable Air After Sales Market Department
Air receiver
Oil flow
Pressure
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Portable Air After Sales Market Department
Oil coolerCool Oil
Warm Oil
Cooling air
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Portable Air After Sales Market Department
Oil filter
Dirty Oil Filtered Oil
By-pass valve
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Portable Air After Sales Market Department
Compressor element
Oil
Oil
Air/Oil
Greasing to the bearings
Air inlet
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Portable Air After Sales Market Department
Oil separator
Air/Oil
Centrifugal separation
Separator element
Oil
Scavenge line
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Portable Air After Sales Market Department
Regulating system
• Regulating valve
• Unloading valve
• Speed regulator
• Blow-down valve
• Safety valve
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Portable Air After Sales Market Department
Regulating system (XAS 185)Regulating Valve
Unloading Valve
Speed Regulator
Safety Valve
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Portable Air After Sales Market Department
Regulating valve
• Regulates the effective pressure in the air receiver
• Provides regulating pressure to :– unloading valve
=> regulates the air inlet according the air requirements
– speed regulator=> regulates the engine speed to reduce fuel consumption
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Portable Air After Sales Market Department
Regulating valve
Spring loaded
Adjusting receiver pressureby changing spring tension
Pressure gauge
to speed regulatorto unloading valve
Regulating pressure
Receiver pressure
to blow-down valve
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Portable Air After Sales Market Department
Regulating valveLOAD UNLOAD
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Portable Air After Sales Market Department
Speed regulator
• Regulates the engine speed in relation to the required air flow
• Load condition : maximum engine speed
• Unload condition : minimum engine speed
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Portable Air After Sales Market Department
Speed regulator
Spring loaded
Regulating pressure Vent Hole
Engine speed
- Min
- Max
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Portable Air After Sales Market Department
Speed regulatorLOAD UNLOAD
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Portable Air After Sales Market Department
Blow-down valve
• Blows off the air receiver pressure once the compressor has shut-down=> this to depressurize the receiver tank
• Integrated in the unloading valve
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Portable Air After Sales Market Department
Blow-down valve
blow
-dow
n va
lve
Receiver pressure
blow-off hole
Air inlet
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Portable Air After Sales Market Department
Blow-down valveLOAD / UNLOAD BLOW-DOWN
Receiver pressure
Receiver pressure return after shut-down
Blow-off receiver pressure
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Portable Air After Sales Market Department
Safety valve
• Blows off the air receiver pressure once this pressure raises above the design pressure.
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Portable Air After Sales Market Department
Electrical system
• Battery voltage : 12 or 24 V
• Starting system– cuts-out starter motor when engine is running– avoids cranking when receiver tank is pressurized
• Safety shut-downs
• Instrument indications
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Portable Air After Sales Market Department
Safety shut-downs
• Compressor :– Compressor element outlet temperature
• Engine :– Coolant temperature– Coolant level– Oil pressure– Fuel level
• Emergency stop
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Portable Air After Sales Market Department
Air treatment options
• Aftercooler
• Water separator
• Fine filters PD / QD
• Re-heater
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Portable Air After Sales Market Department
Air treatment options
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Portable Air After Sales Market Department
Aftercooler - Water separator
• The aftercooler is a heat exchanger, which cools the hot compressed air to precipitate the water that otherwise would condensate in the air hose.
• The outlet temperature is ambient + 7°C.• It is followed by a water separator that separate
the condensate and drains it• Used for : sandblasting, fibre optic cable steering,
pipe cleaning
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Portable Air After Sales Market Department
Aftercooler - Water separator
Water separator
Aftercooler
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Portable Air After Sales Market Department
Fine filters PD / QD
• PD filter will separate oil and solid particles.
• QD filter or carbon filter will separate oil and water vapour.
• Discharge air is instrument quality--nearly “oil free”.
• Only 0.003 ppm oil present in the air outlet
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Portable Air After Sales Market Department
Fine filters PD / QD
PD filter
QD filter
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Portable Air After Sales Market Department
Re-heater
• The re-heater is a heat exchanger, which warms up the compressor outlet air to ambient + 60°C.
• The water and oil will be vaporized resulting in hot and dry air, this avoids condensate problems.
• XAS 46-96 : engine oil warms up the compressed air.
• XAS 146-186 : compressor oil warms up the compressed air
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Portable Air After Sales Market Department
Product nominationoil injected compressors
X A M S 750 C d
Product rangeX : Oil injected portable compressor
Working principleA : Single stage compressorR : Two stage compressor
Working pressure Single stage Two stage
: standard pressure 7 bar/100psi 17 bar/250psiM : medium pressure 8.6 bar/125psi -T : “ten” pressure 10.3 bar/150psi -H : high pressure 12 bar/175psi 20 bar/295psiV : very high pressure 14 bar/200psi 25 bar/365psi
Silencing : Un-silencedS : Silenced
Capacity (FAD)Liter/secCFM (US-version)
Engine supplierC : CaterpillarD : DeutzG : Detroit DieselJ : John DeereK : KubotaY : Yanmar
Prime moverd : diesel engineE : electric motor
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Portable Air After Sales Market Department
60
Contact Numbers•Main Number Atlas Copco Technical Support 800-732-6762 Option 3
•Ed Kukfisz – Compressors – Supervisor 281-542-2562 direct & 832-385-4697 mobile
•Andrew Stevenson – Compressors: Low Pressure720-479-2486 direct & 404-751-6717 mobile
•Andrew Calendar – Compressors: High Pressure720-479-2487 direct & 404-242-6203 mobile
•Scott Ellinger – Compressors720-479-2476 direct & 720-375-1795 mobile
•Robert Walsh – Generators – Supervisor 803-487-0256 direct (mobile)
•Will Hudson – Generators/Compressors 800-732-6762 Ext. 12920 & 832-454-8123 mobile
•Brandon Hobbs – Hydraulic Attachments /Handheld Construction Tools – Supervisor 303-287-8822 direct & 913-424-4039 mobile
•Al Eckenfels – Hydraulic Attachments/Handheld Construction Tools800-760-4049
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Portable Air After Sales Market Department
Committed tosustainable productivity.
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