Installation, Operation & Maintenance Manual - Acme Fluid Handling

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2.4 Liquid TrapsCompressors are designed to pressurize gas, notto pump liquids. The entry of even a small amountof liquid into the compressor will result in seriousdamage to the compressor.On liquefied gas applications, a liquid trap must be usedto prevent the entry of liquid into the compressor.SERVICE TO PERFORMVALVE POSITION4-WAY A B C1. Unload Tank Car into Position Open Open CloseStorage TankOne2. Recover Vapors from Tank Position Close Open OpenCar into Storage TankTwoFigure 2.3C: Three-Valve Manifold Piping Systemlarge enough to do a good job and these should be replacedby a suitable size valve. The liquid discharge should beconnected to the tank truck pump inlet line rather than theoften oversized filler valve connection in the tank head.Corken offers three types of liquid traps for removal ofentrained liquids. The simplest is a mechanical float trap(see figure 2.4A). As the liquid enters the trap the gasvelocity is greatly reduced, which allows the entrainedliquid to drop out. If the liquid level rises above theinlet, the float will plug the compressor suction. Thecompressor creates a vacuum in the inlet piping andcontinues to operate until the operator manually shuts itdown. The trap must be drained and the vacuum-breakervalve opened before restarting the compressor, to allowthe float to drop back. This type of trap is only appropriatefor use where the operator keeps the compressor underfairly close observation. This trap is provided with the109 and 107 compressor packages (see Appendix C fordetails on standard Corken compressor packages).When the compressor will not be under more-or-lessconstant observation an automatic trap is recommendedIt is of extreme importance to prevent the entry of liquidinto the compressor. The inlet of the compressor shouldbe protected from liquid entry by a liquid trap (see section2.4). It is of equal importance to protect the dischargeof the compressor from liquid. This may be done byinstalling a check valve on the discharge and designingthe piping so liquid cannot gravity-drain back into thecompressor. Make sure to install a check valve on vaporlines discharging to the liquid space of the tank.All piping must be in accordance with the laws andcodes governing the service. In the United States, thefollowing codes apply:For LP Gas – The National Fire Protection AssociationPamphlet No. 58, Standard for the Storage and <strong>Handling</strong>of Liquefied Petroleum Gases.For Ammonia – The American National StandardsInstitute, Inc., K61.1-1989, Storage and <strong>Handling</strong> ofAnhydrous Ammonia.Copies of these are available from NFPA, 60 BaterymarchStreet, Boston, Mass, 02110 and ANSI, 1430 Broadway, NewYork, N.Y., 10018. Install, use and maintain this equipmentaccording to Corken instructions and all applicable federal,state, and local laws and previously mentioned codes.Figure 2.4A: Mechanical Trap10
(see figure 2.4B). The automatic trap replaces the float withelectrical float switches. If the liquid level should rise toohigh, the level switch will open and disconnect the powerto the motor starter, stopping the compressor. This designensures the machine will be protected even when it is notunder close observation and is standard in the 109A and107A mounting configurations.Corken’s most sophisticated trap provides the mostthorough liquid separation (see figure 2.4C). This trap islarger and is ASME code stamped. It contains two levelswitches, one for alarm and one for shutdown. In somecases the alarm switch is used to activate a dump valve(not included with trap) or sound an alarm for the trapto be manually drained by the operator. This trap alsocontains a mist pad. A mist pad is a mesh of interwovenwire to disentrain fine liquid mists. The ASME code trap isstandard in the 109B and 107B mounting configurations.A typical wiring diagram for the liquid level switch isshown in figure 2.4D.If your compressor is equipped with a liquid trapof other than Corken manufacture, make sure it isof adequate size to thoroughly remove any liquidentrained in the suction stream.Typical Float Switch Wiring Diagram(1) = Common, black(2) = Normally closed, blue(3) = Normally open, redFigure 2.4D: Typical Float Switch Wiring DiagramNOTE: The level switch MUST be removed fromthe trap before grounding any welding devices tothe trap or associated piping! Failure to do so willdamage the switch contacts.Figure 2.4B: Automatic Liquid TrapFigure 2.4C: ASME Automatic Liquid Trap11
Page 5 and 6: this by withdrawing vapors from the
Page 7 and 8: Corken’s automatically reversible
Page 12 and 13: 2.5 Driver Installation / Flywheels
Page 14 and 15: Chapter 3—Starting Up Your Corken
Page 16 and 17: Chapter 4—Routine Maintenance Cha
Page 18 and 19: Disassembly1. Unscrew the valve cap
Page 20 and 21: of damage to cylinders is corrosion
Page 22 and 23: 5. Push down on washer and insert r
Page 24 and 25: 5.9 Servicing the Four-Way ValveUnl
Page 26 and 27: Appendix AVertical Single-Acting Mo
Page 28 and 29: Appendix B—Vertical Single-Acting
Page 34 and 35: Appendix C—Compressor SelectionCo
Page 36 and 37: Appendix C—Compressor SelectionPr
Page 38 and 39: Appendix D—Outline DimensionsMode
Page 42 and 43: AUTOMATIC LIQUID TRAPLIQUID LEVEL S
Page 50 and 51: Appendix F—91 and F91 Head and Va
Page 52 and 53: Appendix F—91 and F91 Piston Asse
Page 54 and 55: Appendix F—91 and F91 Connecting
Page 56 and 57: Appendix F—91 and F91 Crankcase A
Page 58 and 59: Appendix G—291 and F291 Head and
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Appendix G—291 and F291 Piston As
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Appendix G—291 and F291 Connectin
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Appendix G—291 and F291 Crankcase
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Appendix H—490, 491, and F491 Hea
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Appendix H—490, 491, and F491 Pis
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Appendix H—490, 491, and F491 Con
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Appendix H—490, 491, and F491 Cra
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Appendix I—691 and F691 Head and
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Appendix I—691 and F691 Piston As
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Appendix I—691 and F691 Connectin
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Appendix I—691 and F691 Crankcase
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Appendix J—D891 Head and Valve As
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Appendix J—D891 Crosshead Guide A
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Appendix J—D891 Connecting Rod As
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Appendix J—D891 Crankcase Assembl
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CORKEN, INC. • A Unit of IDEX Cor
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Installation, Operation & Maintenance Manual - Acme Fluid Handling

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