Heavy Duty Balanced Opposed Compressors - Ariel Corporation

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FOR MODELS: JGZ AND JGU SECTION 6 - MAINTENANCE INTERVALS & TROUBLE SHOOTING SECTION 6 - MAINTENANCE INTERVALS & TROU- BLE SHOOTING Recommended Maintenance Intervals Like all equipment, Ariel compressors do require maintenance. The frequency of maintenance is dictated by the environment in which the compressor is placed, the loads the user imposes on the compressor and the cleanliness of the gas. First and foremost on the preventative maintenance list is the completion and compliance with the Ariel Corporation Packagers Standard and Compressor Start Up Check List. All items must be adhered to, both before and after start up. The following is a guide only and, as stated above, may vary due to operating conditions. The time intervals start from the start up date of the unit. If your oil supplier's recommended oil service changes are more frequent than the Ariel recommendations, the supplier’s intervals should be followed. Regular oil analysis is recommended. If problems develop the oil should be changed immediately and the cause of the problem determined and corrected. A log book should be kept with each unit. Every maintenance item can be entered with exacting detail in order that records will be available for tracking maintenance costs per unit and for trouble-shooting. Operator logs should be reviewed by qualified personnel to determine trends in compressor performance and/or maintenance. CAUTION! BE SURE THAT THE COMPRESSOR IS COMPLETELY VENTED TO RELIEVE ALL GAS PRESSURE, AND THE DRIVER WILL NOT EXERT TORQUE ON THE COMPRESSOR CRANKSHAFT THAT COULD RESULT IN INJURY, PRIOR TO TAKING COUPLING READINGS, RE-CHECKING BOLTING TORQUES ON PRESSURE CONTAINING COMPONENTS OR REMOVING ACCESS COVERS FOR PERFORMING INTERNAL INSPECTION OR MAINTENANCE ON THE COMPRESSOR. IN THE CASE OF A DIRECT DRIVE MOTOR, THE BREAKER IS LOCKED OUT. FAILURE TO FOLLOW THESE STEPS CAN RESULT IN SERIOUS PERSONAL INJURY OR DEATH. Daily After running a new compressor (or after a re-location, re-configuring or major overhaul) for the first 24 hours, shutdown, vent gas system and perform a hot alignment check at coupling within 30 minutes, while barring driver shaft to packager’s recommendations. Realign if necessary to hold coupling hub face and rim hot alignment within 0.005 inch (0.13 mm) TIR, except for hub O.D. >17 in. (>43 cm) angular hub-face limit is increased to 0°1’ (0.0167°). Also check fastener torque on gas nozzle flange, valve cap, cylinder head, compressor rod packing flange and, if applicable, crosshead guide to frame bolting. Reference Ariel Techni- 7/09 PAGE 6 - 1
FOR MODELS: JGZ AND JGU SECTION 6 - MAINTENANCE INTERVALS & TROUBLE SHOOTING cal Manual, Fastener Torque Tightening Values or Toolbox Torque Chart, ER-63. After the first week or 150 hours, repeat this fastener torque check. If bearing temperatures increase or a visual inspection of the crankcase indicates bearing wear, check main, connecting rod and crankshaft-thrust bearing clearances. Replace affected bearings if clearances are out of tolerances. See the Ariel Technical Manual for instructions and clearance tolerances. 1. Check frame oil pressure. It should be 50 to 60 psig (3.5 to 4.2 barg ) when at operating temperature. Compressor inlet oil temperature is 190°F (88°C) maximum. 2. Check frame oil level. It should be visible in the sight glass and approximately mid-level when running, if not, determine and correct cause. Do not overfill. Check oil makeup tank for sufficient oil supply. 3. Check lubricator block cycle time. Refer to information plate on top of lubricator box for correct cycle time. Very dirty or wet gas may require a more frequent cycle time than normal. 4. Check primary and secondary packing vents for blowing. If blowing, determine cause and, if necessary, replace packing internal parts. 5. Check and correct any gas leaks. 6. Check and correct any oil leaks. 7. Check operating pressure and temperatures. If not normal, determine cause of abnormality and correct. It is recommended that a daily log of operating temperatures and pressure be kept for reference. 8. Check shutdown set points. 9. Low oil pressure shutdown 35 psig (2.4 barg ) minimum. 10. High discharge gas temperature shutdowns are to be set within 10% or as close as practical above the normal operating discharge temperatures, but not to exceed the “Maximum Discharge Temperature Shutdown Setting” for the service in which the compressor is operating. 11. High and low pressure shutdowns are to be set as close as practical. Consideration should be given to the rod load capacity of the machine. 12. Check lubricator box oil level. 13. Check for unusual noises or vibrations. Monthly (in addition to Daily Requirements) After running a new compressor (or after a re-location, re-configuring or major overhaul) for the first month or 650 hours, shutdown, vent gas system and check fastener torque on gas nozzle flanges, valve caps, cylinder heads and compressor rod packing flanges. Reference Ariel Technical Manual, Fastener Torque Tightening Values or Toolbox Torque Chart, ER-63. Fasteners that turn at the first month check, should be re-checked after the second month or 1300 hours. If loosening persists, consult your packager or Ariel to help determine the cause and recommend the correction. 1. Check and confirm safety shutdown functions. 2. Take a frame oil sample and send to a reputable lubricant laboratory for analy- PAGE 6 - 2 7/09
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Heavy Duty Balanced Opposed Compressors - Ariel Corporation

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