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19 2008SSD-34 (5/11) 18 2008SSD-34 (5/11)
Single-Compressor Module Maintenance
4.3 Oil Service
The oil level indicated on the rst-stage oil separator site glasses varies with inlet and discharge
pressures and operating speed.
• New oil is clear, it may be necessary to use a ashlight to verify the correct oil level.
• The oil level should never reach the top of the upper site glass on the primary oil separator under any
operating conditions.
• If possible block the compressor discharge to force the system into full bypass.
1. Compressor operating at minimum speed 1,800 RPM,
• Lower site glass 50%: No action required.
• Lower site glass less than 50%: Add approved oil to this level.
• Lower site glass more than 100%: Remove excess oil.
2. Compressor is operating at full speed 4,800 RPM the lower site glass will be 100% full and the upper
site glass will also show some level of oil
• Upper site glass 50%: No action required.
• Upper site glass 100% or more: Remove excess oil.
High Oil Carryover
1. System is overlled with oil: The oil level should never reach the top of the primary oil separator top
site glass under any operating condition.
2. No back pressure on the discharge when the compressor is turned off resulting in oil foaming and
carrying over to the secondary oil separator: Check upper site glass when the compressor is rst turned
off.
3. Contaminated or oil saturated secondary oil separator: Replace the secondary oil separator every
8,000 operating hours, more frequently if the gas is dirty.
4. Clogged or restricted scavenge line orice: Remove inspect and clean.
5. Clogged or restricted oil scavenge tube: Remove inspect and clean.
6. Incorrect oil: Use only approved oil.
7. Inlet pressure too high: Verify that the inlet pressure is less than 10 PSIG.
Symptoms
• Low oil level, High temperature fault, Oil in gas.
Possible Cause
• Secondary oil separator is saturated with oil or at the end of its service life. Replace.
• Oil level above top site glass under any operating condition. System overlled with oil. Remove
excess oil, replace secondary oil separator.
• Failed “O” ring in the oil separator block assembly. Repair or replace assembly.