2205B0JE-DA-J-N_2014.05.
5 Maintenance and Inspection
Screw Compressor J-series
5.3 Management of Lubricant
5-18
5.3
Management of Lubricant
5.3.1 Lubricant Management Standard
The lubricant, to which the management standard is applied, is classified as follows:
(1) Synthetic oil: Polyalkylene Glycol (PAG)
(2) Mineral oil: Naphthenic base, Paraffinic base
Synthetic oil: Alkyl benzene (AB), Polyalphaolefin (PAO)
(3) Synthetic oil: Polyolester (POE)
We recommend analyzing oil by sampling at intervals of 6 months.
If the oil does not satisfy the management standards below, replace the oil. (This does not
apply to water contents in PAG oil)
The evaluation items and standards are as follows. The management standards may be changed
without notice.
Table 5-8 Synthetic oil (PAG)
Item
Management Standards
(a) Color
ASTM color standard: 4.0 or less
(b) Total acid number
0.1 mg•KOH/g or less
(c) Kinematic viscosity
Amount of change must be within ±10% from that of the new oil.
(d) Water content
2000 ppm or less
Note 1
(e) Contamination level
Contamination measured by gravimetric analysis (millipore filter value) is
15 mg/100 mL or less.
Table 5-9 Mineral oil, synthetic oil (AB, PAO)
Item
Management Standards
(a) Color
ASTM color standard: 6.0 or less
(b) Total acid number
0.3 mg•KOH/g or less
(c) Kinematic viscosity
Amount of change must be within ±15% from that of the new oil.
(d) Water content
100 ppm or less
Note 1
(e) Contamination level
Contamination measured by gravimetric analysis (millipore filter value) is
15 mg/100 mL or less.
Table 5-10 Synthetic Oil (POE)
Item
Management Standards
(a) Color
ASTM color standard: 4.0 or less
(b) Total acid number
0.2 mg•KOH/g or less
(c) Kinematic viscosity
Amount of change must be within ±10% relative to the new oil.
(d) Water content
200 ppm or less
(e) Contamination level
Contamination measured by gravimetric analysis (millipore filter value) is
15 mg/100 mL or less.
Note 1: Lubricant miscible with ammonia has high hygroscopicity and may contain water during
sampling.
In addition, ammonia dissolved in the lubricant may be detected as water when it is analyzed,
thereby preventing correct measurement of water content. Therefore, the management
standards above should be construed as guidelines.
