Grasso RC6, Руководство по установке и обслуживанию

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4.3 LUBRICATING OILS (choice and recommendations)
For lubrication of refrigeration compressors, several
brands and types of specially developed lubricating oils
are on the market. The choice of oil depends not only
on its good lubrication properties (viscosity) and
chemical stability at the operating conditions of the
compressor, but also on the operating conditions of the
refrigerating plant (solidifying and floc point, solubility).
Grasso has tested and approved for use in its
reciprocating-compressors the brands and types of oil
as listed in the adjacent table 4.4.
The choice of the viscosity of the lubricating oil
depends on the operating conditions of the
compressor. The oil viscosity should always be more
than 15 cSt (based on bearing construction
requirements of the compressor). For the selection of
the oil viscosity grade number, refer to table 4.3 below.
A higher viscosity should be chosen, when a high oil
temperature is expected, due to arduous operating
condition such as:
•
high evaporating temperature;
•
large superheat of the refrigerant suction vapour;
•
prolonged part-load operation with a large number
of cylinders cut-out;
•
a high surrounding temperature;
•
large pressure ratio.
Remark
For the oil types mentioned in the table 4.4, applied
with the refrigerants R22, NH
3
and R134a, the
minimum requirement of the actual oil viscosity of
15 cSt is fulfilled, but only when the maximum oil
temperature as mentioned in the table 4.3 below is
not exceeded.
Refrigerant
used
Brand Type designation
ISO VG
number
1
)
NH
3
and
R22
AVIA
Avilub FC 46/68
2
)
BP
Energol LPT-F 46
Energol LPT-F 68 46
68
CASTROL
Icematic 299
2
)
CPI
CP-1009-68
2
) (NH
3
only!)
ELF
Elfrima FR 68
2
)
ESSO
Zerice 46
Zerice 68
Zerice S 46
Zerice S 68 46
68
46
68
FINA
Purfrigol MP 68 68
FUCHS
KC 46
KC 68 46
68
KROON OIL
Carsinus FC 46/68
2
)
MOBIL
Arctic oil 300
2
)
PETRO
CANADA
Reflo 68A
2
) (NH
3
only!)
Q 8
Stravinsky B
Stravinsky C
2
)
2
)
SHELL
Clavus 46
Clavus 68
Clavus G 46
Clavus G 68
Clavus G 100 46
68
46
68
100
SUN-OIL
Suniso 3.5 GS
Suniso 4 GS
Suniso 5 GS
Suniso 4 SA
2
)
2
)
2
)
2
) (NH
3
only!)
TEXACO
Capella WF 68 68
TOTAL
Lunaria S 46/68
2
)
R134a
and
R404A
3
)
CASTROL
Icematic SW 68
Icematic SW 100 68
100
CPI
Solest 68
Solest 120
2
)
2
)
DEA
Triton SE 55
Triton SE 80
Triton SE 120
2
)
2
)
2
)
ELF
Planetelf ACD 68
Planetelf ACD 100
2
)
2
)
FINA
Purfrigol ST VG 68
Purfrigol ST VG 100
2
)
2
)
FUCHS
Reniso E 68
Reniso E 100 68
100
ICI
Emkarte RL 68S
Emkarte RL 100S
2
)
2
)
MOBIL
EAL Arctic 68
EAL Arctic 100
2
)
2
)
SHELL
Clavus R68
Clavus R100
2
)
2
)
SUN-OIL
Suniso Excel
2
)
TEXACO
Capella HFC 68
Capella HFC 100 68
100
Some of the oil types listed in the table may be marketed under other
names and/or designations; these oils can also be used, provided
their identity can be proved beyond any doubt.
Application of other
oils is not permitted without written consent of Grasso.
1
) Viscosity grade number designation according to ISO Standard
3448.
2
) Consult your oil supplier to determine the maximum allowable oil
temperature at an oil viscosity of 15 cSt, under prevailing operating
conditions and refrigerant used.
3
) In case of R404A always consult your oil supplier in advance for
advise.
Refrigerant
used
Max.
allowable
evaporating
temperature
t
o,max.
(
o
C)
Maximum allowable
crankcase oil temperature*
ISO VG-number
46 68 100
NH
3
- 60 68 76
R22
-64 59 68 76
-30 56 66 74
-20 54 64 71
-10 51 62 68
0 44 56 64
+10 29 47 56
R134a
-50 - 74 83
-30 - 71 80
-20 - 69 79
-10 - 67 77
0 - 61 74
+10 - 47 67
*
Data based on minimum oil viscosity of 15 cSt at the bearing
surfaces, which is derived from the oil type, solubility of the
refrigerant in the oil (halocarbon refrigerants only) and operating
conditions. Assumed is that the oil temperature at the bearing
surfaces = 6 K above crankcase oil temperature.
Example: R22, t
o,max.
= 0
o
C : recommended oil type is ISO VG100
NH
3
under normal operating conditions, oil type with
ISO VG68 is recommended.
Table 4.3 Oil selection table
Table 4.4 Approved oil types for Grasso reciprocating
compressors
The grey areas show the recommended ISO VG-numbered oils.
Refrigeration Division
Grasso
4 . GE NE R A L D A T A
page C2.6 Installation and Maintenance Manual RC(U)6 v001.99.01.en