2202L5JE-DA-C5-N_2015.05.
4. Compressor and Package Unit Operation
Compound 2-stage Screw Compressor
4.1 Lubricating Oil (Refrigerant Oil)
1612LSC Speed Increaser Type
4-5
4.1.5 Lubricating Oil Management Criteria
Lubricating oils that are managed by the criteria are classified into the following categories:
(1) Synthetic oils: Polyalkylene glycols (PAG)
(2) Mineral oils: Naphthenic base oils and paraffinic base oils
(3) Synthetic oils: Alkylbenzene (AB) and Polyalphaolefine (PAO)
(4) Synthetic oils: Polyolesters (POE)
Oil sampling and analysis is recommended every six months.
If the following control criteria are not satisfied, replace the oil.
◆
Note that the water content of PAG shall be excluded from the above oil replacement criteria.
Refer to the
Note
in the following table.
The analysis items and the criteria are shown in the following tables. Please note that these
management criteria may be changed without notice.
Table 4-1 Synthetic Oil (PAG)
Item
Criteria
(a) Color phase
ASTM color scale: 4.0 or less
(b) Total acid number (TAN)
0.1 mg KOH/g or less
(c) Kinematic viscosity
Within ±10 % from that of fresh oil
(d) Water content
2000 mass ppm or less
Note
(e) Degree of contamination
Degree of contamination measured by mass method (Millipore
value) shall be 15 mg/100 mL or less
Table 4-2 Mineral Oil and Synthetic Oil (AB, PAO)
Item
Criteria
(a) Color phase
ASTM color scale: 6.0 or less
(b) Total acid number (TAN)
0.3 mg KOH/g or less
(c) Kinematic viscosity
Within ±15 % from that of fresh oil
(d) Water content
100 mass ppm or less
(e) Degree of
contamination
Degree of contamination measured by mass method (Millipore
value) shall be 15 mg/100 mL or less
Table 4-3 Synthetic Oil (POE)
Item
Criteria
(a) Color phase
ASTM color scale: 4.0 or less
(b) Total acid number (TAN)
0.2 mg KOH/g or less
(c) Kinematic viscosity
Within ±10 % from that of fresh oil
(d) Water content
200 mass ppm or less
(e) Degree of
contamination
Degree of contamination measured by mass method (Millipore
value) shall be 15 mg/100 mL or less
Note
: Synthetic oils (compatible with ammonia) are so highly hygroscopic that they can absorb
moisture at the time of sampling. In addition, the ammonia content they have absorbed
may be detected as the water content at the time of the analysis, making it difficult to
precisely measure the water content. Thus, use the criterion value only as a reference.
