Castrol Aircol PD 68

Castrol Aircol™ PD oils are a range of compressor lubricants, based upon highly refined mineral oils, which are intended for the lubrication of both reciprocating and rotary air compressors.

Castrol Aircol PD 68 grades are ashless oils recommended for the lubrication of rotors, bearings and gears in rotary compressors, especially the oil-flooded screw type with lubricant drain cycles of up to 2000 hours under normal use. Normal use in screw type compressors is defined by a maximum air discharge temperature =/< 100°C as defined by ISO 6743-3:2003.

Aircol PD can be used for either normal or severe duty lubrication of reciprocating and rotary drip-feed air compressors, as defined by ISO 6743.

Normal duty is described as:-

• discharge temperatures =/< 165°C
• differential pressures =/< 2.5 MPa (25 bar)
• discharge pressures =/< 7.0 MPa (70 bar).

Severe Duty is described as:-

• discharge temperatures > 165°C
• differential pressures > 2.5 MPa (25 bar)
• discharge pressures > 7.0 MPa (70 bar)

Aircol PD compressor oils exhibit low carbon forming tendencies and meet the requirements of the DIN 51506 VDL classification for reciprocating compressors having air discharge temperatures up to 220°C.
Selection of the required viscosity grade should be based on the compressor manufacturers’ recommendation. However, as a general guide Aircol PD 32 and 46 are suitable for oil-flooded rotary compressors, whereas Aircol PD 68 and 100 would be selected for lubricating the crankcase and cylinders of reciprocating compressors. Aircol PD 150 is recommended for sliding-vane compressors, or for reciprocating units at high ambient temperatures.

The Aircol PD range is fully compatible with nitrile, silicone and fluropolymer seal materials.

Aircol PD is classified as follows:

• DIN 51506 classification – VDL
• ISO 6743/3 – DAA and DAB for reciprocating air compressors, DAG for rotary air compressors

Aircol PD meets the requirements (for appropriate viscosity grade) of major compressor manufacturers such as Atlas
Copco, Champion, Sullair, Compair/Broomwade, Ingersoll-Rand, Kaeser and Bauer.

• Good water separation characteristics allow condensation to readily separate from the oil, minimising the risk of emulsions which could block the oil separator element.
• Fully inhibited against corrosion which enables protection even when operating under humid conditions.
• Good thermal stability, low volatility and low carbon formation reduce the risk of fire and explosion and lead to a longer operating life (up to 2000 hours).
• Low deposit-forming tendencies extend oil change intervals and provide longer air filter life which contributes to a reduction in maintenance costs.
• Excellent coalescing properties mean little carry-over of oil in the air stream.

Castrol Aircol PD 68 compressor oils are available in a wide range of viscosities, to suit different types of compressors operating in varying ambient temperatures. Selection of the required viscosity grade should be based on the compressor manufacturers’ recommendations for the appropriate ambient temperature range, which will have been chosen to provide the best compromise between maintaining a fluid film between the working surface and minimising the amount of power absorbed by fluid friction in this oil film.

The product should not be stored at temperatures over 60°C. It should be kept away from sunlight, intense cold and extreme temperature fluctuations. If possible, the packaging should not be exposed to the elements. Otherwise, the drums should be laid horizontally to avoid any contamination from water and to prevent the product’s label from rubbing off.

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