Installation Manual Series CF (without incapsulated screw compressors) 23042013 Rev. A / May 2007 18 of 60
4.6 Recommendations for
Lubricants
4.6.1 Type of lubricants
In consideration of the high stresses to which
lubricants are subjected in screw compressors
with oil injected cooler, it is recommended to ex-
clusively use non-aging and anti-corrosive oil
grades with a low foaming tendency that have
been demonstrated to be suitable for application.
GHH RAND recommend stable and proven char-
acteristic lubricants:
„PrimeCool“ on mineral basis &
„PrimeCool Plus“ on synthetic basis.
In case of utilisation of another lubricant, it is
mandatory that oil specification as follows must
be observed.
Technical specification of PrimeCool (mineral
lubricant)
Properties Unit Test method
Density at 15 °C kg/m3 874 DIN 51 757
Kinematic viscosity
at 40 °C
at 100 °C
mm
2
/s
46
6,8
DIN 51 550 &
DIN 51 562-1
Viscosity index 101 DIN ISO 2909
Flashpoint °C 230 DIN ISO 2592
Pourpoint °C -31 DIN ISO 3016
Neutralization number TAN mgKOH/g 0,2 DIN 51 558-2
Demulsification at 54 °C min 15 DIN 51 599
Foaming
Seq.I: 24 °C
Seq.II: 93,5 °C
Seq.III after 93,5 °C
ml/ml
ml/ml
ml/ml
0/0
20/
0
5/0
ASTM D 892
ASTM D 892
ASTM D 892
Air release at 50° C min 3 DIN 51 381
Technical specification of PrimeCool Plus (syn-
thetic lubricant)
Properties Unit Test method
Density at 15 °C kg/m3 837 DIN 51 757
Kinematic viscosity
Bei 40 °C
Bei 100 °C
mm
2
/s
46
7,8
DIN 51 550 &
DIN 51 562-1
Viscosity index 139 DIN ISO 2909
Flashpoint °C 278 DIN ISO 2592
Pourpoint °C <-60 DIN ISO 3016
Neutralization number TAN mgKOH/g 0,4 DIN 51 558-2
Demulsification at 54 °C min 15 DIN 51 599
Foaming
Seq.I: 24 °C
Seq.II: 93,5 °C
Seq.III: after 93,5 °C
ml/ml
ml/ml
ml/ml
5/0
20/0
5/0
ASTM D 892
ASTM D 892
ASTM D 892
Air release at 50° C min 3 DIN 51 381
Different specifications will lead to non-warranty!
As deterioration of lubricant strongly depends on
conditions of the airborne area and the operating
method of the compressor, regular checks of the
oil quality have to be carried out and docu-
mented. In either case the interval of oil change
has to be observed according to maintenance
instructions.
In case of utilisation of synthetic lubricants, com-
patibility with compressor component material
has to be ensured. Furthermore oil additives
within the oil must not chemically react to the
condensate which is unavoidably developed at
start-up of compressor unit.
Authorisation for other lubricants other than
PrimeCool / PrimeCool Plus will not be given!
4.6.2 Lubricant selection
Viscosity is the most important criterion of any
lubricant. To avoid damage to the bearings, a
minimum viscosity of 15 mm²/s (cSt) is required
for the selected oil injection temperature. As vis-
cosity changes with temperatures, the recom-
mendations as per the following table are appli-
cable depending on respective injection tempera-
tures:
Injection temperature °C up to 50 up to 60 up to 70
ISO-Viscosity class
VG 32 VG 46 VG 68
Viscosity at 40 °C mm²/s 28.8-35.2 41.4-50.6 61.2-74.8
Flashpoint COC °C >200 >210 >220
The pour point is min. 5 °C below the lowest am-
bient temperature.
On machinery which is continuously operated at
very low speeds (male-rotor tip speed less than
15 m/s), the respective next higher viscosity
class is to be used in accordance with the above
table.
To avoid wearing effects on antifriction bearings
and driving gears to the greatest possible extent,
only those oil grades are accepted which contain
wear-reduction additives to provide FZG load
stage no. 10 as a minimum.
To Next Page
Loading...