ROTORCOMP NK 31 - Lubricants and Operating Materials; Oil Recommendation

8.1
[en] 02/2014
Installation and operating manual - NK 31
8.1 Lubricants and operating materials
8.1.1 Oil recommendation
RC screw compressors must be operated with
an oil suitable for special requirements. This oil
must be approved by the manufacturer for screw
compressors.
It must even be suitable under unfavorable oper-
ating conditions, such as soiling of the intake air
with gases, solvent vapors and exhaust gases
and at high ambient temperatures.
Suitable oil types and oil manufacturers can be
specied for screw compressor on request.
Rened oils (mineral oils) synthetic oils and bio
oils (biodegradable) can be used as screw com-
pressor oil.
The materials and gaskets used in the screw
compressor system must be taken into account
when selecting the oil type. Corrosion and other
material damage may not occur.
It is not permissible to mix different oils.
8.1.2 Topping up oil
Use the same manufacturer and the same oil
type as is currently in use in the screw compres-
sor.
8.1.3 Measures at low room temperature
Sufcient room heating.
At ambient temperatures below 0°C/32°F, the
system must be heated up to at least 20°C/68°F
before start-up with an integrated standstill
heater.
8.1.4 Piping materials
Plastic compressed-air piping systems can be
attacked by the oil used in the screw compressor.
Note
See the information sheet!
The requirements placed on the cooling oil in the
screw compressor include the following:
– High resistance to aging
– High dispersive power
– Flash point: over 200°C/392°F
– Minimum foaming
– High corrosion protection
– Operating temperature: up to 110°C/230°F
– Select suitable viscosity class, e.g. ISO VG 68.
Attention
Be sure to comply with the oil viscosity, as other-
wise there is a danger for the bearing service life.
8 Lubricants and Operating Materials Maintenance Parts