Compressors Oils

9 products

Compressor oils: the compressor type decides, and safety depends on it

Match the oil to the machine

  • Reciprocating (piston) air compressors — HERCULES, VDL-quality oils to DIN 51506 in ISO VG 32, 46, 68 and 100, with low evaporation loss, thermal and oxidation stability, low coking and zinc-free anti-wear additives. For units running at continuously high pressure and high discharge temperature, HERCULES SYNPOE 100 on polyolester base oils.
  • Screw, rotary, vane and centrifugal compressors — HERCULES SYNPAO (ISO VG 46, 68, 150), synthetic oils with strong oxidation resistance, low residue build-up and long-term cleanliness.
  • Gas compressors — HERCULES LP 150, a polyalkylene glycol lubricant for enclosed reciprocating compressors handling LNG and methane, ethane, LPG (propane and butane), ethylene, propylene, butadiene, ammonia, vinyl chloride and dry inert gases.

Why gas compressors need a different chemistry entirely

This is not a refinement, it is the whole point. Hydrocarbon gases dissolve into mineral oil, and as they do the oil's viscosity collapses. A mineral oil that measures correctly in the drum can lose most of its load-carrying film once the machine is under gas pressure, and the bearings and cylinders wear rapidly. The polyalkylene glycol base of HERCULES LP resists that dilution, which is why gas duty requires it rather than a good mineral oil in a heavier grade.

The safety point about carbon deposits

In a reciprocating air compressor, an oil with poor oxidation stability or high coking tendency leaves carbon deposits in the discharge valves, ports and receiver. Those deposits insulate, heat builds, and in the presence of hot compressed air the result can be a discharge-line fire or an explosion. This is a documented failure mode in industrial compressed air systems, not a theoretical risk. Using a proper VDL-quality oil, keeping discharge temperature within specification and draining the receiver are the controls. In Iraqi ambient temperatures, where discharge temperatures run higher than the machine was rated for in Europe, this deserves more attention rather than less.

Refrigeration compressors are a separate category

Refrigeration lubricants must be matched to the refrigerant, not just the compressor. Those products sit in the industrial range — COMET and COMET SYNPOE for HFC refrigerants, COMET SYNALB for systems evaporating below −40 °C — and should never be substituted with an air compressor oil.

Frequently asked questions

Which oil should I use in a screw compressor?

Cyclon HERCULES SYNPAO, a synthetic oil available in ISO VG 46, 68 and 150, suitable for screw, rotary, vane and centrifugal compressors, with strong oxidation resistance and low residue build-up. Reciprocating piston compressors take Cyclon HERCULES, a VDL-quality oil to DIN 51506, or Cyclon HERCULES SYNPOE 100 for units running continuously at high pressure and high discharge temperature.

Can I use ordinary compressor oil in a gas compressor?

No, and this is not a minor distinction. Hydrocarbon gases dissolve into mineral oil and the oil's viscosity collapses, so an oil that measures correctly in the drum can lose most of its load-carrying film once the machine is under gas pressure, and bearings and cylinders wear rapidly. Cyclon HERCULES LP 150 uses a polyalkylene glycol base that resists that dilution, and is intended for enclosed reciprocating compressors handling LNG and methane, ethane, LPG, ethylene, propylene, butadiene, ammonia, vinyl chloride and dry inert gases.

Why does compressor oil quality matter for safety?

In a reciprocating air compressor, an oil with poor oxidation stability or a high coking tendency leaves carbon deposits in the discharge valves, ports and receiver. Those deposits insulate, heat accumulates, and with hot compressed air present the result can be a discharge-line fire or explosion. It is a documented failure mode in industrial compressed air systems. Using a proper VDL-quality oil, keeping discharge temperature within specification and draining the receiver are the controls, and in Iraqi ambient temperatures, where discharge temperatures run higher than the machine's European rating assumed, it deserves more attention rather than less.

Not sure which product a vehicle, machine or fleet needs? Try the Cyclon oil selector, or send us the details and we will specify it in writing.