Heavy Duty Balanced Opposed Compressors - Ariel Corporation

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FOR MODELS: JGZ AND JGU SECTION 2 - COMPRESSOR INSTALLATION Take Measurements Here FIGURE 2-1 FLATNESS CHECK LOCATIONS - TYPICAL TABLE 2-1 TOP-COVER-MOUNTING SURFACE - FLATNESS TOLERANCE COMPRESSOR FRAME a TOLERANCE FOR ALIGNMENT INCHES (mm) JGM:N:P:Q/1/2, JG:A/2/4, JGR:J/2 0.004 (0.10) JGA/6, JGR/4, JGJ/4/6, JGH:E:K:T/2/4, JGC:D/2/4, JGU:Z/2/4, JGB:V/4, KBB:V/4 0.006 (0.15) JGE:K:T/6, JGC:D/6, JGU:Z/6, JGB:V/6, KBB:V/6 0.008 (0.20) a. The underlined frames are required to use both top plane flatness and soft foot checks. 5. In preparation for frame plane measurements, be sure that the compressor frame hold down bolting is properly installed and tightened. Either remove or reposition the top cover(s) and gasket(s) to expose the frame's top-covermounting surface, be sure that the top-cover-mounting surface is clean. With new unit installations it is recommended that the frame plane be initially checked prior to the guide feet being shimmed and after the initial rough coupling alignment. On compressors shipped disassembled, the initial check should be carried out prior to the guide & cylinder assemblies being installed. Take the appropriate corrective shimming, or other height adjustment, action to have the top-cover-mounting surface fall within the specified plane tolerance. Subsequent readings should be taken and recorded after the guides and cylinders have been fully installed and then again after any vessels have been installed and shimmed. Corrective action is to be taken if guide, cylinder and/or vessel installation results in the frame top rail measurements not meeting the specified tolerances 6. Refer to Ariel ER-26, Appendix A in the Ariel Packager’s Standards for proper frame foot and crosshead guide bolt size and torque values. 7. The top-cover-mounting surface should be measured for flatness and/or soft foot check be done as required: a.When setting a new compressor. b.After reinstalling a compressor frame. c.When loose hold down fasteners are found. PAGE 2 - 4 7/09
FOR MODELS: JGZ AND JGU SECTION 2 - COMPRESSOR INSTALLATION d.Every 6 months or 4000 hours as recommended maintenance inspection. 8. The Equipment used for flatness measurements should have a published accuracy of + 0.001 inches (+ 0.025 mm) over the required distance to measure the entire length of both frame rails. 9. To check soft foot, the compressor frame hold down bolting is to be properly installed and tightened. Loosen each hold down bolt individually while checking the frame foot to skid deflection with a calibrated dial indicator. Correct any hold down position that deflects more than 0.002 inches (0.05 mm) when released. Re-torque the hold down bolt and repeat at each frame to skid bolt. Setting Crosshead Guides With crosshead guides and cylinders unsupported, prior to bottle installation: 1. Measure the clearances between each crosshead guide foot and the guide support. Except for JGZ:U and KBB:V frames when equipped with long two compartment (L2) crosshead guides, measure clearance at the outboard feet under the guide extension, which are used to support the guide and the feet under the guide are to be unsupported. 2. Completely fill the clearances with shim stock (reference Figure 2-1). 3. Tighten the crosshead guide foot (or long two compartment guide extension foot) to guide support holddown bolting to full fastener torque. Refer to Ariel ER-26. Crosshead Guide Foot Shim Thickness = Unsupported + Deflection Thicknesses to paragraph 4. above Crosshead Guide Skid Support (Connected to Skid) FIGURE 2-1 Crosshead Guide Foot to Skid-Support Shim - Typical 4. Loosen the bolting while checking with a dial indicator to be sure that the clearance is completely filled and there is no deflection. 5. Using the information from the current Ariel Performance Program, determine the estimated crosshead guide foot deflection for JGH:E:K:T:C:D:Z:U:KBB:V frames. This calculated value is required to compensate for the deflection or droop of the cantilevered weight of the guide and cylinder. For the JG:A:M:N:P:Q:R:W:J frames, the guide and cylinder weights are not sufficient to deflect the guide. 6. Lift or jack cylinder, just slightly to allow insertion of additional shims based on the calculated value. 7. Re-tighten the crosshead guide hold down bolting to full fastener torque. 8. Repeat for each crosshead guide support. 9. Shims may need to be adjusted so that the crosshead to guide top and bottom clearances, and piston rod run-out measurements are within the tolerance requirements. Reference Section 5 for checking crosshead clearances and piston rod run-out, and Section 1 for tolerance limits. 10. For some applications, head-end cylinder supports may be desirable for larger classes of cylinders (bosses and tapped holes are provided on all K:T:C:D:Z:U:B:V class cylinders). See Ariel cylinder outline drawings for dimensional details. These supports must be adjusted and set when the components are at operating temperature. 7/09 PAGE 2 - 5
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Heavy Duty Balanced Opposed Compressors - Ariel Corporation

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