Heavy Duty Balanced Opposed Compressors - Ariel Corporation

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FOR MODELS: JGZ AND JGU SECTION 5 - MAINTENANCE kets flush to the top of the base with a knife. 8. Reinstall the chain drives. (See “Chain Drive System” on Page 5-29). Be sure that the chain oiling system is properly installed. 9. Refill crankcase with oil. Thoroughly pre-lube compressor to be sure that bearings are lubricated and to help remove foreign materials from the lube system. Visually inspect for oil flow at all bearing locations. 10.Reinstall all spacer bars. Be sure that spacer bar o-rings in frame and crosshead guide are in place and in good condition, replace if necessary. Locate the match mark on the spacer bar. Install the spacer bar so that the match mark is up and next to the spacer bar boss with the same marking. Utilize the Top-Cover Spacer Bar Alignment Tools (A- 11987), see Figure 7-4 on Page 7-3. The top-cover spacer bars are used as gasket surfaces to top covers. Tighten all spacer-bar cap screws to value in Table 1-11 on Page 1- 18. 11. Check bearing jack and thrust clearances, see “Checking Main Bearing Clearances” on Page 5-17 and “Checking Connecting Rod (Crank Pin) Bearing Clearances” on Page 5- 3. Record values on a copy of the form on page 5-68. 12.Account for all tools, measuring and lifting equipment, supplies, replaced parts, etc. to be sure they have all been removed from inside the crankcase. 13.Inspect top cover gaskets. If there is any doubt that they are not in a good usable condition, install new gaskets. Before installing a gasket, apply a thin coating of anti-seize lubricant to both sides or to the metal seating surfaces. This will help to hold the gasket in place during assembly and aid in ease of future removal. Reinstall the top covers and tighten bolting hand wrench tight. 14.Reinstall the coupling hub and center member to the coupling manufacturer’s instructions. 15.When replacing any bearings and/or connecting rod(s) it is important to check the bearing break-in temperatures. When starting the compressor after the first 10 minutes of run time, after one hour and after 4 hours, shutdown compressor and remove the frame top covers. Immediately (within 5 minutes after shutdown), check the bearing cap temperatures using a temperature probe (hand held thermocouple probe or infrared thermometer), record on a copy of form on page 5-68. If a variation more than 8°F (4.5°C) is measured between any two main or any two connecting rod bearings, contact Ariel. CAUTION: DO NOT PLACE ANY PART OF YOUR BODY INSIDE THE CRANKCASE WITHOUT OBSERVING THE CAUTION ON PAGE 5-1. 16.Complete remaining information on the copy of the form on page 5-68 and fax the copy to Ariel Technical Services. Torsional Vibration Detuners - Installation on Crankshaft Torsional vibration in reciprocating compressors is a critical consideration. In a given application to avoid resonance that can occur at the natural frequencies of the system, the drive train may require tuning as determined by a qualified torsional vibration analysis provider working closely with the packager, driver manufacturer, and Ariel. Depending on the torsional vibration analysis (TVA) results, the compressor may be equipped with or require the addition of torsional vibration detuners (donuts) on the compressor crankshaft. Detuner donuts are sized specifically for the compressor and applica- 7/09 PAGE 5 - 27
FOR MODELS: JGZ AND JGU SECTION 5 - MAINTENANCE tion, and custom-bored for installation on a specific compressor crankshaft spreader section. Do not order or install detuner donuts unless specifically required by the TVA report. An improperly tuned compressor package could severely damage the compressor, coupling, and/or driver, and may cause personal injury. When the addition of detuner donut(s) is required, contact the Ariel Response Center and request Ariel Engineering Reference ER-42 "Determining Detuner Inside Diameter". A specific application may require one or more detuners. CAUTION: DETUNER INSTALLATION IS A TWO-PERSON OPERATION. DETUNER PARTS ARE HEAVY AND CUMBERSOME. TO AVOID PERSONAL INJURY OR EQUIPMENT DAMAGE AT LEAST TWO PERSONS ARE TO BE USED FOR SEVERAL OF THE FOLLOWING STEPS. Install torsional vibration detuners on Ariel crankshafts as follows: 1. Verify the correct quantity, type and mounting location(s) of detuner(s) for the specific application. Ariel, the driver manufacturer, the packager, and the torsional analysis provider cooperatively develop this information. The detailed location is to be provided by the TVA report provider. 2. A finished detuner has a custom-finished bore with identification stamping as shown in the Figure. The stamping includes the detuner part number, the instruction "mount this face toward coupling" on both halves, final bore dimensions, and frame serial number (or crankshaft serial number and nominal crankshaft diameter). Verify this information is on the detuner and that it correlates with the compressor and crankshaft. If this information is in question or missing, contact Ariel Engineering before proceeding. Detuner donuts are not interchangeable for use on other crankshafts, including replacement crankshafts. 3. Remove capscrews and discard the two Bolt Head Notch Identification Stamping Remove Shim Remove Shim FIGURE 5-16 DETUNER DONUT - TYPICAL Bolt Head Notch shims located between the joints of the new detuner. 4. Clean each detuner part thoroughly to remove any dirt or foreign material. 5. Remove crankcase top cover. 6. Wipe crankshaft spreader section clean and dry. 7. An overhead crane is recommended to handle detuner halves. For easy hoisting, install a forged steel eyebolt in the threaded hole provided on the outside diameter near the detuner bolt head notch. If a crane is not available, use two people to lift, position, and secure the detuner halves during installation. 8. Lower one detuner half onto the crankshaft with capscrew(s) removed. Use extreme care to avoid damage, such as nicks or scratches, to the crankshaft. Take care to prevent personal injury during this operation. Position the piece on the top of the crankshaft spreader section. 9. Position the other deturner half on top of the crankshaft spreader section, sideby-side with the first half. PAGE 5 - 28 7/09
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Heavy Duty Balanced Opposed Compressors - Ariel Corporation

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