2201Q4JE-MY-C9-N_2018.01.
Chapter 4 Compressor and Package Unit Operation
Compound 2-stage Screw Compressor 4032**C
4.1 Lubricating Oil (Refrigerant Oil)
4-4
4.1.5 Lubricating Oil Replacement Timing
4.1.5.1 After Starting the Initial Operation
As the oil can easily be contaminated and degraded relatively quickly during the initial operation due to
scales and deposits remaining in piping and vessels, be sure to sample and analyze the oil after 500
hours of operation.
If it is found as a result of the analysis that the criteria given in Tables 4-1 to 4-3 are not satisfied, the oil
must be replaced.
4.1.5.2 During Normal Operation
Lubricating oils will degrade gradually as the system is operated over time.
The rate of degradation depends on the operating condition, type of oil and amount of foreign matters
and moisture contained in the oil. The lubricating oil must be sampled and analyzed every six months. If
it is found as a result of the analysis that the control criteria given in Tables 4-1 to 4-3 are not satisfied,
the oil must be replaced.
If the oil filters are frequently clogged or the oil color quickly becomes darker and unclear, replace the
oil after removing the cause of the problem.
