Heavy Duty Balanced Opposed Compressors - Ariel Corporation

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FOR MODELS: JGZ AND JGU SECTION 2 - COMPRESSOR INSTALLATION • If dial indicator methods, are used, be sure that readings are repeatable. • Correct for indicator arm sag. • Check the crankshaft thrust, or end play, after any movements have been made. Both the compressor and driver shafts should “float” either direction and hold position. If the shafts resist float or “spring” back, the axial clearance must be corrected. See Section 1 for allowable compressor crankshaft thrust clearance values. • Confirm that the alignment is within tolerance by checking the face and rim TIR at the coupling after all components are heat soaked. When properly aligned, the forces on the connected equipment will be at a minimum. This will result in a smooth running unit and long bearing life. Cold Alignment Align the compressor to the driver taking into account the difference in thermal growth between the compressor and driver, so the face and rim TIR measurements at the coupling will be within the Figure 2-2 limits when equipment warms to the normal operating temperatures. Reference Figure 2-3 and Table 2-3 for the compressor centerline height change, based on 6.5 x 10 -6 /°F (11.7 x 10 -6 /°C) and a typical differential temperature increase of 100°F (55.6°C). For other significantly different predicted differential temperature increases, the thermal growth value may be calculated for the compressor. Refer to the driver manufacturer’s thermal growth prediction for the driver differential temperature increase to normal operating temperature. When larger compressors are shipped with the crosshead TABLE 2-3 TB Woods HSH/FSH Couplings - Angular TIR Coupling Size Flange OD, In. (cm) Angular TIR, max., In. (mm) 105 29.25 (76.1) 0.0084 (0.21) 160 33.50 (85.1) 0.0096 (0.24) Compressor Centerline HOT Compressor Centerline COLD FIGURE 2-3 Compressor Thermal Growth Thermal Growth TABLE 2-3 Typical Thermal Growth Predictions Frame Model THERMAL GROWTH Inches (mm) JGM:N:P:Q 0.006 (0.15) JG:A:I 0.007 (0.18) JGR:W:J 0.008 (0.20) JGH:E:K:T 0.011 (0.28) JGC:D 0.014 (0.36) JGZ:U 0.016 (0.41) KBB:V 0.018 (0.46) JGB:V 0.020 (0.51) guides removed, it may be desirable to align the frame to the driver prior to installing the PAGE 2 - 8 7/09
FOR MODELS: JGZ AND JGU SECTION 2 - COMPRESSOR INSTALLATION guides and crossheads. Frames shipped without guides after July 13, 2007 are provided with temporary plates, through bolts and protective sleeves at each connecting rod bushing. This allows for the frame to be properly pre-lubed prior to turning the crankshaft for alignment. The temporary hardware at the connecting rods is then removed (and discarded) prior to installing the crosshead guides and crossheads. When removing this temporary hardware, oil may flow from the rod bushing cavity behind the plates. A catch basin to prevent oil spillage is recommended. Hot Alignment After 24 to 48 hours of full load operation, or when entire skid and block mount is heat soaked, TIR measurements at the rim of the coupling are not to exceed 0.005 inches (0.13 mm) and on the face are to be within the Table 2-2 or Table 2-3 limits. If not within the these limits, re-align the compressor. Alignment Methods 1. Laser - the preferred method for JGC:D:Z:U:B:V and KBB:V frames. 2. Face/Rim Dial Indicator Measurements at Coupling. 3. Reverse Indicator. 4. Optical. 5. Mechanical direct to computer. Electrical Grounding CAUTION: The compressor skid must be wired to a suitable earth ground to reduce the potential for electric shock injury, while protecting the equipment. Refer to the local electrical codes to determine a suitable ground rod. Pneumatically Actuated Unloaders & Clearance Devices When compressor cylinders are equipped with pneumatically actuated unloaders or clearance devices, care must be taken to be sure that the actuating air or gas system is appropriately vented, and that the system incorporates provisions that will not allow the process gas to back flow into the actuating air or gas system. The control media supply system and vent system for the unloader must provide for the safe and effective operation of the unloader throughout the full range of compressor operating conditions. ACI, an <strong>Ariel</strong> supplier, has published a document outlining system design and requirements. Please reference this document for system design and evaluation. The document may be found at support/vendor literature/reciprocating compressors/ACI on the <strong>Ariel</strong> web site: www.arielcorp.com. 7/09 PAGE 2 - 9
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Heavy Duty Balanced Opposed Compressors - Ariel Corporation

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