Heavy Duty Balanced Opposed Compressors - Ariel Corporation

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-
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