03-Reciprocating Gas Compressors 1.0

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    1. Print slides 2-66 as note pages and distribute

    2. Print slide 67 as a slide and distribute

    3. Print slide 68 as a slide but do not distribute

    4. Click on Slide Show, view slide show to start the show

    5. Hit escape to end show.

    6. If any icons ( ) appear in the bottom left of any slide, touch

    on the icon to animate the slide. Hit escape to stop the animation

    and return to the slide. Move the cursor slightly before advancing

    to the next slide.

    7. After tests are taken, grade them and multiply the number

    correct by 10 to get a percentage. Write the percentage on the test

    and send them to your district training record keeper for processing.

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    Reciprocating GasCompressors

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    100psi

    10psi

    Gas well Gas pipeline

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    10psi

    105psi

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    Applications

    for

    Gas compressors

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    Gas Injection

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    Gas Lift

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    Gas Gathering

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    Coal Seam Gas Evacuation

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    Gas Storage

    open

    open

    closed

    closed

    Summer

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    Gas Storage

    closed

    closed

    open

    open

    Winter

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    Gas Transmission

    Station 1 Station 2

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    WATER STEAM

    Gas Turbine

    Fuel BoosterCo-generation (Co-gen)

    application

    GENERATOR TURBINE ENGINE

    BOILER

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    Larger diameter cylinders are for lower

    pressures. Gas, at a lower pressure,

    occupies more space.

    The size of the cylinder is determined by the

    pressure and quantity of the gas to be

    compressed.

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    Smaller diameter cylinders are for

    higher pressures. Gas, at a higher

    pressure, occupies less space.

    The size of the cylinder is determined by the

    pressure and quantity of the gas to be

    compressed.

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    CYLINDER BORE

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    INLET VALVES

    DISCHARGE VALVES

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    Differential pressure opens

    the inlet valves.

    50 psi

    45 psi

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    Springs inside the valve

    close the valve.

    50 psi

    50 psi

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    Differential pressure holds

    the inlet valve closed.

    50 psi

    105 psi

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    100 psi

    100 psi

    Springs inside the valve

    close the valve.

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    45 psi

    100 psi

    Differential pressure holds

    the discharge valves closed.

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    Valve internals

    SEAT PLATE

    DAMPING PLATE

    DAMPING SPRINGS

    CLOSING SPRINGS

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    What causes the pressure

    changes in the cylinder bore?

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    ~ r (length of bore)2

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    PISTON ROD PISTON

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    PISTON ROD

    OIL IN

    VENT

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    114.7 psiA

    458.8 psiA

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    80 F

    320 F

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    100

    psig

    2000

    psig

    Ex: Overall ratio, when considering absolute, is 17.56 : 1

    1st stg= 100-283, 2nd stg= 283-760, 3rd stg= 760-2000(2.6 : 1) (2.6 : 1) (2.6 : 1)

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    100 psi

    444 psi

    ?

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    vent and drain

    connections

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    Compressor

    101

    1.

    Compressorsal

    wayshavethesamesizecylindersnomattertheapplication.

    2.

    Differentialpres

    sureoperatesthevalves.

    3.

    Aslongasthere

    isenoughhorsepower,as

    inglestagecompressorcanbeusedfor

    anyratio.

    4.

    Excessiveratioacrossacylindercanresultinexcessivepistonrodlo

    adand

    temperatureincrease.

    5.

    Thepurposeofapistonistochangevolum

    ewithinthecylinder.

    6.

    Acylindercano

    nlybeoperatedasdouble

    acting.

    7.

    Theprimarypurposeofthecompressorfra

    meistoconvertrotatingm

    otionto

    reciprocatingmotio

    n.

    8.

    Acylindercanb

    emadesingleactingbyre

    movingadischargevalve

    onone

    cylinderend.

    9.

    Largecylinders

    arenormallyusedforhigh

    pressures

    10.

    Pistonringsare

    addedtosealtheclearanc

    ebetweenthepistonandt

    hebore.

    Name:

    Date:

    Percentage:

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    Compressor

    101

    1.

    Compressorsalw

    ayshavethesamesizecy

    lindersnomattertheapplication.

    F

    2.

    Differentialpress

    ureoperatesthevalves.

    T

    3.

    Aslongasthereisenoughhorsepower,asinglestagecompressorcan

    beusedfor

    anyratio.

    F

    4.

    Excessiveratioa

    crossacylindercanresult

    inexcessivepistonrodloa

    dand

    temperatureincrease.

    T

    5.

    Thepurposeofa

    pistonistochangevolumewithinthecylinder.

    T

    6.

    Acylindercanon

    lybeoperatedasdoublea

    cting.

    F

    7.

    Theprimarypurp

    oseofthecompressorframeistoconvertrotatingm

    otionto

    reciprocatingmotion.

    T

    8.

    Acylindercanbe

    madesingleactingbyrem

    ovingadischargevalveo

    none

    cylinderend.

    F

    9.

    Largecylindersa

    renormallyusedforhigh

    pressures

    F

    10.

    Pistonringsareaddedtosealtheclearance

    betweenthepistonandth