Heavy Duty Balanced Opposed Compressors - Ariel Corporation

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FOR MODELS: JGZ AND JGU SECTION 5 - MAINTENANCE be done without removing the piston from the cylinder. Replace the wear band before it has worn enough to allow the piston to touch the cylinder bore. Piston Rings - Installation 1. Place the rings in the grooves in the piston. Compress the rings by hand. 2. For two-piece high-pressure face cut piston rings, be sure notches face toward the pressure (notches face away from wear band), reference Figure 5-29 on Page 5-43. 3. With the rings fully compressed in the grooves, insert the rod and piston into the cylinder. Make sure the rings stay in place while inserting the piston and rod. NOTE: RING END GAPS ARE TO BE STAGGERED AROUND THE PISTON, RATHER THAN IN LINE. 4. Follow the steps under “Piston and Rod - Installation” on Page 5-40. Special Purpose Piston Rings - High Pressure Face-Cut Face-cut piston rings are typically used in cylinders with 2500 psi (172 bar) MAWP or higher, and generally with notched and fluted wear bands. The rings are installed with the face cuts toward the highest pressure, or toward the nearest head. Gas pressure in the wear band area is allowed to escape past the piston rings, via the face cuts, during the suction stroke to prevent loading the wear band and provide for a long service life. Piston Rod Crank End Piston Notches Pressure Pressure FIGURE 5-29 HIGH-PRESSURE FACE-CUT PISTON RING ORIENTATION Wear Band - Installation Piston Rings Wear Band Piston Rings Staggered End Gaps Install the wear band as if it were another piston ring as above. Notches Piston Rod Pressure Packing - Removal & Disassembly 1. Remove the piston and piston rod. See “Piston and Rod - Removal” on Page 5- 36. 7/09 PAGE 5 - 43 Head End
FOR MODELS: JGZ AND JGU SECTION 5 - MAINTENANCE 2. Remove oil wiper gland(s) from the crosshead and oil wiper packing. 3. Disconnect all tubing and instrumentation (if applicable) from the packing flange. Remove the twelve point cap screws that hold the pressure packing gland to the crank end of the cylinder/head. 4. At this point do not remove the small stacking tie rod nuts from the studs, as they hold the entire packing case together, so it can be removed as an assembly. 5. Pull the entire pressure packing out into the crosshead guide. It will then come out through the large side opening of the guide. The pressure packing may now be taken to a clean place for disassembly. 6. Set the pressure packing on a clean surface on its nose cup (cylinder-end down). Match mark the outside diameter of the cups to be sure of proper reassembly. Long tie studs hold the pressure packing together. The stud holes are not equally spaced. This prevents the stack of parts from being aligned incorrectly. Remove the stud nuts and the pressure packing can be un-stacked. Replace these nuts each time the pressure packing is serviced. 7. Ring wear can be determined by placing the assembled rings, (note matchmarks), on the piston rod. Check end gap clearance. If the ends butt, or nearly butt, they should be replaced by new rings. See “Types of Piston Rod Packing Rings” on Page 5-46 for end gaps. 8. Fins or wire edges on the rings due to wear should be carefully filed off so that all matching edges will be square. 9. Remove the spiral wound gasket on the end cup by prying loose with a sharp awl. Be careful not to scratch the sides of the gasket groove. Discard old gasket. 10. Before reassembly be certain all parts are perfectly clean. Piston Rod Packing - Reassembly 1. Be sure to refer to the pressure packing assembly in your parts book. <strong>Ariel</strong> supplies parts books with each unit. Please contact your distributor if you do not have a parts book. A pressure packing assembly drawing also is packaged with each pressure packing re-build kit. 2. Care must be taken to prevent scratching the mating surfaces of the cups, which can cause leaks. Cup surfaces must be clean and dry when being re-assembled. 3. Before a packing case is installed, it should always be disassembled and thoroughly cleaned in an appropriate solvent for the intended service. 4. If installing a new set of rod rings in an existing packing case, the case parts need to be inspected for wear. Cups should be smooth and flat on the back side where the rod rings must seal. If the cups or grooves have worn concave or tapered, they should be reground or re-lapped. Do not reduce the cup thickness to less than the rework dimension shown on the packing assembly drawing in the <strong>Ariel</strong> Parts Book. It is rarely necessary to alter the crosshead side of the cups, however, if this is found necessary, care must be taken so that the correct side clearance for the renewal rings is not destroyed. NOTE: IF PREMATURE WEAR IS SUSPECTED, REFER TO “Cylinder and Packing Lubrication” ON PAGE 4-16. 5. Before assembling the rings into the case, following is recommended: Put each PAGE 5 - 44 7/09
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Heavy Duty Balanced Opposed Compressors - Ariel Corporation

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