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Purdue University

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International Compressor Engineering Conference School of Mechanical Engineering

1984

Basic Practices in Compressors SelectionM. O. Khan

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Khan, M. O., "Basic Practices in Compressors Selection " (1984).International Compressor Engineering Conference. Paper 509.h //d l b d d / /

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design is not readily adaptable tointercooler connections or for additionalside process loads. Exceptions to this maybe found in th e custom-built Europeandesigns of axial compressors.

WHEN TO USE AXIAL-CENTRIFUGAL COMPRESSORSA combination of axial/centrifugal staging isused:a.

b.

When fo r large inlet flows in excess of50,000 ACFM, higher compression dischargepressures above 150 psig are required.The centrifugal impellers placed at th e tai lend of axial compression stages optimize th elow flow-high head capability of th ecentrifugal stage, thereby reducing th eoverall length of th e rotor.

FUTURE TRENDSCompression machinery in any plant plays a keyrole. Careful aerodynamic, thermodynamic anddesign considerations ar e necessary as thereliable and eff icient operation of a plant isdependent on how the compressors ar e selected andoperated. In recent years much attention hasbeen directed to improve th e compressorrel iabil i ty through surveillence and efficiencythrough improved techniques in th e fabrication.Our knowledge of the limiting phenomena such assurge, stonewall and rotor dynamics needs furtheradvances such that the control systems andprocess operations can be adopted to fullyuti l ize th e complete range of performance withoutany precipitating damage. The materials ofconstruction is another area that needs ourattention. Materials need to be developed whichcould provide more confidence in predicting theirstress behaviour under corrosion, and cyclicfatigue. Improved machining, assembling andsurface finishing techniques fo r the aerodynamicflow paths in the compression machinery has beenrecently reported to have improved thecompression efficiency to a limited extent,Ref 5. Extensive equipment surveillance withdata logging and trending of rotor vibrations andbearing temperatures is rightfully becomingpopular in improving th e availability of th eturbomachinery in critical plant services.The advent of high pressure reinjection of

ACKNOWLEDGEMENTSThe author wishes to thank Brown & Root, Inc.Houston for the permission to publish thisarticle. Most of the material covered herein isbased on a Basic Practice (BP) developed by theauthor,REFERENCES

2.

3.4.

5.

"A Study On Design Criteria and Matching OfTurbomachines"0. E. Balje, Trans ASME J, Eng. fo r PowerParts B at Jan. 1962"Compressor Selection For The ChemicalProcess Industries"R. F. Neerken, Chern Eng. Jan. 20, 1975"Basic Practice in Compressors Selection"M. 0. Khan, Brown &Root BP-00-01 May 1984Compressor Handbook fo r th e HydrocarbonProcessing IndustriesGulf Publishing Company, Houston 1979Gulf South Compression ConferenceAug. 1983, Louisiana State UniversityGroup Discussions.

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POSITIVEDISPLACEMENT

ICYLINDER CYLINDERLUBED NONLUBED

~ ~ RANK CROSS CROSS DIA-CASE HEAD HEAD PHRAGMTYPE TYPE CYL.

COMPRESSORS&BLOWERS

IOIL SLIDING OIL OIL STRAIGHT HELICAL SCREWFLOODED VANESINGLE ECC.LOBE !.SLIDINGVANE

FLOODED FLOODEDHELICAL VANE LOBE LOBE OR(ROOTSJ ( LYSHOLMJSP IRAXI AL~ - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ~

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( ' \ FOUNDATION~ r::uco's"rC _Jor:t -("{

!N STALL AT ION \JOPERf\TINGCOST6ARIAT !ONS\J

FIG 3: GROUP OF Ff\CTORS INFLUENCING COMPRESSOR SELECTION

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c;"j'gtn

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Fig ( 4 )

Specif ic Op eed . N,

S pec if ic Spee d v/s Specific Diameter Range forReciprocating, Rotary, Centr ifugal and AxialC o m pr essors .

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